CN107089726B - A wastewater treatment reactor and a process method for treating wastewater - Google Patents

Abstract

The invention relates to the field of wastewater, and in particular, discloses a wastewater treatment reactor and a process method for treating wastewater. The wastewater treatment reactor is sequentially arranged along the flow direction of the wastewater as an anaerobic tank, an anoxic tank, a fan-shaped anammox tank and an aerobic tank, forming a "pre-ammonia/nitrosation-anammox (short-range ammonium oxidation)" CANON)-aerobic treatment" combined process. The reactor and the process method for treating wastewater have high wastewater treatment efficiency, good denitrification and phosphorus removal effects, and easy control and adjustment of reaction conditions.

Description

A wastewater treatment reactor and a process method for treating wastewater

technical field

The invention relates to the field of wastewater treatment, in particular to a wastewater treatment reactor and a process method for treating wastewater.

Background technique

Anaerobic ammonium oxidation (Anammox) is the conversion of ammonia (NH ₄ ⁺ ) into nitrogen (N ₂ ) with nitrite (NO ₂ ^- ) as an electron acceptor under anoxic conditions. Nitrate acts as an electron donor to fix CO ₂ and produce nitrate (NO ₃ ^- ). The microorganisms that perform this process are called anaerobic ammonium oxidation bacteria (AAOB).

Biological turntable is a kind of biofilm sewage biological treatment technology, which is the artificial reinforcement of sewage irrigation and land treatment. This treatment method makes bacteria, fungi, microorganisms, protozoa and other micro-animals grow on the biological turntable filler carrier. Breeding, the formation of film-like biological sludge - biofilm.

Anammox is a new type of nitrogen removal process, which is divided into SHARON-ANAMMOX process, CANON process and OLAND process. In the SHARON-ANAMMOX process, nitrification is carried out first, and the requirement for the concentration ratio of NO ₂ ^- /NH ₄ ⁺ in the influent of ANAMMOX is very strict, which is basically controlled at about 1.20-1.35. Therefore, the control of the degree of nitrification in the SHARON section needs to be extremely strict. The shock load of the reactor generally has two types: concentration shock and hydraulic shock load. The ANAMMOX section is not resistant to shock loads due to harsh control conditions and sensitive biochemical treatment systems. CANON process and OLAND process are generally designed as a reactor, but both of these two processes have a nitrosation process first, and then enter the anammox stage. In one reactor, it is necessary to control nitrosation and realize Anaerobic ammonia oxidation. In the actual process, the dissolved oxygen, the nitrosation degree of NH ₄ ⁺ and the ratio of NO ₂ ^- /NH ₄ ⁺ concentration in wastewater are difficult to control.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a wastewater treatment reactor, the conditions of the reactor biological reaction are easy to control, and the combined process of "pre-ammonia/nitrosation-anaerobic ammonia oxidation (short-range CANON)-aerobic treatment" is formed, and the reaction The waste water treatment efficiency of the device and the combined process is high, and the effect of nitrogen and phosphorus removal is good.

In order to realize the above-mentioned purpose of the present invention, the following technical solutions are specially adopted:

A waste water treatment reactor, the waste water treatment reactor is set as a circular pool body, the pool body includes an inner ring pool and an outer ring pool, and an annular confluence groove and an annular water collecting tank are arranged between the inner ring pool and the outer ring pool; The ponds are divided into anaerobic ponds, anoxic ponds and anaerobic ammonium oxidation ponds according to the flow direction of water flow; the anaerobic ponds and anoxic ponds are in the form of annular corridors as a whole, and the anaerobic ammonium oxidation ponds are in the form of fans. The main water inlet pipe is located at the beginning of the anaerobic tank. An underwater propeller is arranged on the wall of the anaerobic tank to enhance the flow of water. The anaerobic tank is provided with a fixed filler for culturing anaerobic sludge. The anaerobic tank is connected to the annular The confluence groove, part of the effluent flows into the annular confluence groove. A rotatable shunt door is arranged between the anaerobic tank and the anoxic pond. The shunt door is rotated through the transmission mechanism, and the shunt door is rotated to the required position and fixed. The door has the function of diverting the effluent of the anaerobic tank. The waste water on one side of the diverting door enters the annular confluence tank, and the waste water on the other side of the diverting door enters the anoxic tank. Part of the effluent of the anaerobic tank flows into the anoxic tank; the inside of the anoxic tank is divided into three corridors, the bottom of the anoxic tank is provided with a first aeration system, and the effluent of the anoxic tank flows into the annular confluence tank. The annular confluence tank collects the effluent from the anaerobic tank and the anoxic tank, and the tank body also includes a water delivery pipe and a transfer pump, so that the confluent wastewater in the annular confluence tank can be transferred to the anammox tank. Multiple groups of biological turntables are arranged inside the anammox tank for wastewater treatment. An annular water inlet channel is arranged on the outer periphery of the anammox ammonium oxidation tank, and a plurality of water inlet branch pipes are arranged on the annular water inlet channel; All are connected to the annular water channel; the water inlets of the plurality of water inlet branch pipes are connected to the water delivery pipe. The annular water collecting tank collects the wastewater treated by the anammox tank through the outflow of the orifice; the water storage level of the anammox tank is two-thirds to three-quarters of the height of the disk of the installed biological turntable. The inner ring pool is an aerobic pool, the inflow water of the aerobic pool comes from the annular water collecting tank, a second aeration device is arranged at the bottom, and the aerobic pool is communicated with the general outlet tank.

In a preferred embodiment of the present invention, a suspended filler for providing a carrier for the growth of biofilms is arranged between each two groups of biological turntables, and each group of biological turntables is arranged to be reversed when viewed from the outside of the wastewater treatment reactor. Clock rotation.

In a preferred embodiment of the present invention, the suspension filler includes a spherical shell and a carrier for fixing the biofilm arranged in the shell, the diameter of the shell is 10-30 mm, and the diameter is larger than every two disks of each group of biological turntables The distance between the sheets, the shell is made of high molecular polymer by injection molding, and the high molecular polymer is polypropylene or polyethylene; the material of the built-in carrier is a porous material with a specific gravity of less than 1, and the density of the porous material is 0.90 ~ 0.96g/ cm ³ .

In a preferred embodiment of the present invention, a third aeration device is provided at the bottom of the anammox tank, and the aeration device adopts the mode of intermittent aeration.

In a preferred embodiment of the present invention, the rotation angle controlled by the diverter door, that is, the angle between the diverter door and the retaining wall, ranges from 30° to 150°.

A process method for treating wastewater, utilizing the above-mentioned wastewater treatment reactor for wastewater treatment, forming a combined process of "pre-ammonization/nitrosation-anaerobic ammonia oxidation (short-range CANON)-aerobic treatment": anaerobic tank It constitutes an anaerobic section, which mainly cultivates anaerobic ammoniated bacteria, converts organic nitrogen into ammonia nitrogen, and controls the dissolved oxygen in the anaerobic section at 0-0.2 mg/L; the anaerobic tank constitutes an anoxic section, which mainly cultivates facultative oxygen. The dissolved oxygen in the anoxic section is controlled at 0.2-2.0mg/L, so that the biological reaction of nitrification can be carried out in the anoxic section to convert NH ₄ ⁺ into NO ₂ ^- ; the anaerobic ammonia oxidation tank constitutes an anaerobic anaerobic The anammox section mainly cultivates anammox bacteria, the dissolved oxygen in the anammox section is controlled at 0.3-1.0mg/L, so that the biological reaction of anammox can be carried out here; the activated sludge is cultivated in the aerobic section, It mainly removes organic substances in water, and at the same time, phosphorus accumulating bacteria absorbs inorganic phosphorus in water excessively under aerobic conditions, and the dissolved oxygen in the aerobic section is controlled to be greater than 2.0 mg/L.

In a preferred embodiment of the present invention, the flow ratio of the anaerobic tank entering the anoxic tank and the annular confluence tank is adjusted by controlling the size of the rotation angle, thereby controlling the NO ₂ ^- /NH ₄ in the wastewater after the annular confluence tank is confluent. ⁺ concentration ratio, so that the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio entering the anammox section of the main body is in the range of 1.20-1.35.

In a preferred embodiment of the present invention, in the overall process of the process method for treating wastewater, the nitrogen removal load is 3.0-5.0 kgN/(m ³ .d).

The wastewater treatment reactor provided by the present invention and the process method for treating wastewater have the following beneficial effects:

1. The reactor provided by the present invention has a unique arrangement and an optimized structure, which is easy to control the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio in the wastewater of the main anammox section, and improves the efficiency of biological denitrification treatment.

2. By arranging the biological turntable in a fan-shaped arrangement, the fan-shaped water inflow is realized, which greatly improves the problem of excessive load on the start-end turntable of the biological turntable in the prior art. The diversion effect of the fan-shaped water inlet and the rotation of the turntable forms a mixed flow in the reactor that is superior to the ordinary push flow, and the hydraulic conditions are good, which makes the volume utilization rate of the biological turntable higher and improves the biological treatment efficiency of the wastewater treatment reactor.

In the anammox section, the biological turntable combines the process characteristics of the moving bed biofilm, and the biological turntable is combined with the suspended filler treatment, the number of biofilms per unit volume increases, the biodegradability is strengthened, the efficiency of biological treatment is improved, and the the overall pollutant removal efficiency of the reactor.

3. "Wide inlet water, narrow outlet water" enables the biological turntable to speed up the shedding and metabolism of the biofilm. The anammox section adopts the biological turntable process, the sludge age is long, the energy consumption is low, and the oxygen demand is reduced by 50-60% during anammox denitrification.

4. The process method for treating wastewater provided by the present invention has reasonable process route, clear and orderly treatment mechanism, and high nitrogen and phosphorus removal efficiency. The concentration ratio of NO ₂ ⁻ /NH ₄ ⁺ in the main anammox process section is easy to control, and the efficiency of biological denitrification treatment is improved.

5. The process method for treating wastewater provided by the present invention is combined with a large number of experiments to screen out the best combined process method, and the orderly and organic Combined with the ground, each section supports each other in terms of regulation functions, and a new conceptual scheme for denitrification and phosphorus removal of wastewater is proposed. After the combination, the overall process method is more efficient, more economical and more stable. The process operation is stable and reliable, and it is resistant to impact load. The sludge output is small, the sludge treatment cost is low, and the sewage treatment effect is good, which is of great significance to environmental protection.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a wastewater treatment reactor provided in an embodiment of the present invention from a first perspective;

2 is a schematic structural diagram of a wastewater treatment reactor provided in an embodiment of the present invention from a second perspective;

3 is a schematic diagram of the flow of wastewater from a first perspective when the wastewater treatment reactor provided by the embodiment of the present invention treats wastewater;

FIG. 4 is a schematic diagram of the flow of wastewater from a second perspective when the wastewater treatment reactor according to the embodiment of the present invention treats wastewater.

Icon: 100-wastewater treatment reactor; 110-inner ring tank; 111-aerobic tank; 112-total effluent tank; 120-outer ring tank; 121-anaerobic tank; 122-anoxic tank; 123-anaerobic ammonia Oxidation tank; 124-corridor; 125-biological turntable; 126-ring inlet channel; 127-water inlet branch pipe; 128-water delivery pipe; 129-suspended packing; Packing; 160-main inlet pipe; 161-submerged propeller; 170-split door; 180-first aeration device; 181-second aeration device; 182-third aeration device; 183-transfer pump; 184 - Transmission mechanism; 185 - Retaining wall.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arranged", "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

This embodiment provides a wastewater treatment reactor 100 .

Please refer to FIG. 1 and FIG. 2 , the wastewater treatment reactor 100 is configured as a circular tank body, and the tank body includes an inner ring tank 110 and an outer ring tank 120 . An annular confluence groove 130 and an annular water collecting groove 140 are arranged between the inner ring pool 110 and the outer ring pool 120 . The outer ring pool 120 is divided into anaerobic pool 121, anoxic pool 122 and anaerobic ammonium oxidation pool 123 in order according to the flow direction of water flow; the whole of anaerobic pool 121 and the whole of anoxic pool 122 are in the form of a ring-shaped corridor. The pool 123 is fan-shaped.

The wastewater treatment reactor 100 provided above is used for wastewater treatment with higher pollution levels. Specifically, the COD, ammonia nitrogen and total phosphorus in the wastewater before treatment are 500-1000 mg/L, 100-200 mg/L and 5-10 mg/L respectively, and the COD, ammonia nitrogen in the wastewater after treatment by the above-mentioned wastewater treatment reactor 100 and total phosphorus were 50 ~ 80mg/L, 10mg/L and 1.0mg/L. (The COD value of the effluent after the reactor treatment generally refers to the measured value of the effluent COD after the subsequent precipitation unit, and other indicators are the same.) The wastewater treatment reactor 100 provided in this embodiment can effectively treat the wastewater, and the treatment effect is remarkable. .

Further, part of the effluent of the anaerobic tank 121 flows into the anoxic tank 122; the inside of the anoxic tank 122 is divided into 3 corridors 124, the bottom of the anoxic tank 122 is provided with a first aeration system, and the effluent of the anoxic tank 122 flows into the annular confluence. Slot 130. The more subdivided corridors 124 can prolong the treatment time of the water flow in the anoxic tank 122 . Micro-aeration is carried out in the anoxic tank 122, and the dissolved oxygen in the anoxic tank 122 is controlled at 0.2-2.0 mg/L, which ensures the biological reaction of nitrification in the anoxic tank 122, so that the waste water entering the anoxic tank 122 will contain Most of the ammonia nitrogen is converted into nitrous nitrogen. The aeration volume of the micro-aeration is adjusted through the valve, and the dissolved oxygen is controlled at 0.2-2.0mg/L in combination with the online dissolved oxygen measuring instrument.

The general water inlet pipe 160 is located at the beginning of the anaerobic tank 121. An underwater propeller 161 is arranged on the tank wall of the anaerobic tank 121 to enhance the flow of water. The anaerobic tank 121 is provided with a fixed device for culturing anaerobic sludge. The filler 150 and the anaerobic tank 121 are communicated with the annular confluence groove 130 , and part of the effluent flows into the annular confluence groove 130 .

The annular confluence tank 130 collects the effluent from the anaerobic tank 121 and the anoxic tank 122, and the tank body also includes a water delivery pipe 128 and a transfer pump 183, so that the confluent wastewater in the annular confluence tank 130 can be transferred to the anammox tank 123 .

It should be understood that the above-mentioned inner ring pool 110 and outer ring pool 120 only refer to the inner ring pool formed by the wastewater treatment reactor 100 mentioned in the embodiment of the present invention when the wastewater flows, relative to the circular pool body. 110 and the outer ring pool 120, do not apply to understanding to other fields.

Please refer to FIG. 1 , FIG. 3 and FIG. 4 , a rotatable diverter door 170 is arranged between the anaerobic tank 121 and the anoxic tank 122 . It has the function of diverting the effluent of the anaerobic tank 121 , the waste water inside the diversion door 170 enters the annular confluence groove 130 , and the waste water outside the diversion gate 170 enters the anoxic tank 122 .

It should be noted that the pipe valve of the aeration device can also be placed on the periphery of the anaerobic tank 121 and the anoxic tank 122 . The waste water in the peripheral annular water inlet channel 126 of the anammox tank 123 flows into the anammox tank 123 through the overflow weir.

Please continue to refer to FIG. 1 . Further, the rotation angle of the diverter door 170 (ie, the angle α shown in FIG. 1 , which is the angle between the diverter door 170 and the retaining wall 185 ) ranges from 30° to 150°. Preferably, the rotation angle of the diverter door 170 is selected as 90°. The split flow on both sides of the split gate 170 , that is, the flow ratio of the wastewater entering the anoxic tank 122 (nitrosation) and the annular confluence tank 130 is preferably controlled to be about 1:1. In the wastewater entering the annular confluence tank 130 , NH ₄ ⁺ has an absolute advantage, while most of the ammonia nitrogen in the wastewater entering the anoxic tank 122 is converted into nitrous nitrogen through nitrosation biological reaction, and then flows into the annular confluence tank 130 . The two streams of wastewater are merged in the annular confluence groove 130, and the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the wastewater at the end of the annular confluence groove 130 is preferably in the range of 1.20-1.35.

If the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the waste water at the end of the annular confluence groove 130 is less than 1.2, the ammonia nitrogen is too high, then the diverter door 170 is rotated to the side of the retaining wall 185 to reduce the rotation angle, so that the oxygen-deficient tank 122 enters the sub-basin _The ^nitrified wastewater increases, while the ammonia nitrogen directly entering the annular confluence tank 130 from the anaerobic tank 121 decreases ^. If the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the wastewater at the end of the annular confluence groove 130 is greater than 1.35, the ammonia nitrogen in the wastewater at the end of the annular confluence groove 130 is relatively low, and the diverter door 170 is rotated to the outside to increase the rotation angle to enter the anoxic tank. 122 _The amount of ^nitrified wastewater is reduced, while the amount ^of ammonia nitrogen that directly enters the annular confluence tank 130 from the anaerobic tank 121 increases _. 1.35.

The requirement of NO ₂ ^- /NH ₄ ⁺ concentration ratio in the anammox section of common reactor is very strict and it is difficult to control the instantaneous change. The ratio of NO ₂ ^- /NH ₄ ⁺ concentration in wastewater lacks effective and easy control methods, and can only rely on strict dissolved oxygen control. However, the ratio of NO ₂ ^- /NH ₄ ⁺ concentration in wastewater ultimately depends on the degree of ammoniation and nitrosation reactions carried out first. Controlling the dissolved oxygen in wastewater can partially control the degree of reaction of the above two reactions, and indirectly control wastewater. _{The concentration ratio of NO 2 -} ^/ NH ₄ ^{+ in} wastewater cannot be directly _controlled ^. This means that even if the precise regulation of the dissolved oxygen in the wastewater is achieved, the precise regulation of the NO ₂ ^- /NH ₄ ⁺ concentration ratio in the wastewater cannot be directly achieved.

By setting the above-mentioned diverter gate 170 to adjust the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio, the dissolved oxygen control conditions of each pool are assisted to be looser and easier to achieve. It can be seen that the wastewater treatment reactor 100 provided by the embodiment of the present invention is easy to control the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the main anammox tank 123, and can ensure that the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio is at an optimal concentration for a long time. The ratio is in the range of 1.20-1.35, so that the reactor anammox tank 123 is in efficient biological treatment, and the efficiency of biological denitrification treatment is improved.

The above-mentioned diverter door 170 is made of reinforced concrete or metal, which is heavy and cannot be pushed by the impact force of the water flow. Only the transmission mechanism 184 drives the diverter door 170 to rotate. It should be understood that the specific structure for realizing the rotation of the diverter door 170 described above is not limited here. The specific structure for realizing the rotation of the diverter door 170 can be selected from a common transmission mechanism in the prior art. In this embodiment, preferably, the above-mentioned transmission mechanism 184 can select an electric motor and a planetary gear assembly, and the diverter door 170 is drivingly connected with the above-mentioned planetary gear assembly, so as to ensure that the diverter door 170 rotates accurately to the set angle. The transmission principles of the electric motor and the planetary gear assembly are well known to those skilled in the art, and will not be repeated here.

Further, the anammox tank 123 is in the shape of a fan. Multiple groups of biological turntables 125 for treating the waste water are arranged inside the anammox tank 123, an annular water inlet channel 126 is arranged on the outer periphery of the anammox ammonium oxidation tank 123, and a plurality of water inlet branch pipes 127 are arranged on the annular water inlet channel 126; The water outlets of the plurality of water inlet branch pipes 127 are all connected to the annular water channel; the water inlets of the plurality of water inlet branch pipes 127 are connected to the water delivery pipe 128 . The annular water collecting tank 140 collects the wastewater treated by the anammox tank 123 through the outlet of the orifice. The inner ring tank 110 is an aerobic tank 111 , the influent water of the aerobic tank 111 comes from the annular water collecting tank 140 , and a second aeration device 181 is arranged at the bottom. The anammox tank 123 adopts the biological turntable 125 for sewage treatment, and the sludge age is long and the energy consumption is low. And when anaerobic ammonia oxidation is used for denitrification, compared with denitrification, the oxygen demand is reduced by 50-60%, and no external carbon source is required. A third aeration device 182 is arranged at the bottom of the anammox tank 123, and the third aeration device 182 adopts the mode of intermittent aeration.

Each section is set compactly, and the settings of the diverter door 170, the annular confluence groove 130, the fan-shaped anammox tank 123, the aerobic tank 111, etc. are exquisite and optimized. The annular and split flow arrangement is adopted, which cleverly solves the problems of diversion and confluence of many segments. The arrangement of each segment of the wastewater treatment reactor 100 is reasonable, the structure is optimized, and the type is unique.

Further, biofilms are attached to each disc of the multiple groups of biological turntables 125 arranged inside the anammox tank 123, so as to treat the waste water. Because the annular water inlet channel 126 distributes the water evenly and distributes the original large amount of waste water to the extension of the entire anammox tank 123, the water flow per unit length of the water inlet channel is much lower than that of other reactors, which greatly improves the performance of the biological turntable 125. The problem of excessive load on the end turntable (the starting turntable refers to the several turntables in each group of biological turntables that first contact the wastewater along the flow direction of the water flow).

Preferably, the above-mentioned annular water inlet channel 126 has a depth of 0.2-0.3m. Therefore, the water flow rate per unit length of the water inlet channel can be further reduced, and the problem of excessive load on the turntable at the starting end of the biological turntable 125 can be further improved.

Further, the water storage level of the anammox tank 123 is two-thirds to three-quarters of the height of the disk of the installed biological turntable 125 . Therefore, it is possible to ensure a part of the oxygenation process of the biological turntable 125 , which is beneficial to the maintenance of the dissolved oxygen concentration in the anammox tank 123 .

Preferably, in this embodiment, viewed from the outside of the wastewater treatment reactor 100 , the biological turntables 125 are all arranged to rotate counterclockwise when viewed from the outside of the wastewater treatment reactor 100 .

Referring to FIG. 1 , further, a suspending filler 129 for providing a carrier for the growth of the biofilm is disposed between each two groups of the biological turntables 125 . Since the multiple groups of biological turntables 125 inside the anammox tank 123 are also arranged in a fan shape as a whole, a fan-shaped gap is left between each two groups of biological turntables 125 . Arranging the suspended fillers 129 in each of the above-mentioned gaps can not only make full use of the above-mentioned fan-shaped gaps, but also further improve the overall wastewater treatment effect and wastewater treatment efficiency of the wastewater treatment reactor 100 . Through the annular water inlet channel 126, the water is evenly distributed, so that a large amount of waste water is arranged in the extension of the entire anammox tank 123, and the water flow per unit length of the annular water inlet channel 126 is much lower than that of the traditional biological rotating disk reactor. . The problem of excessive load on the turntable at the beginning of the biological turntable is greatly improved.

Based on the above, specifically, the suspension filler 129 includes a spherical shell and a biofilm carrier disposed in the shell, and the diameter of the shell is greater than the distance between every two discs of each group of biological turntables 125 . Therefore, the suspension filler 129 can be effectively prevented from being jammed between the disks, which affects the normal operation of the biological turntable 125 . Specifically, the above-mentioned suspension filler 129 is composed of a mesh spherical shell and a built-in carrier. The shell is made of high molecular polymer injection molding. g/cm ³ , the filler diameter is 10-30 mm, and the material is polypropylene or polyethylene. By arranging the above-mentioned suspension filler 129, the biological turntable 125 and the suspension filler 129 can work together. Therefore, for the biological turntable 125 process, the problem of excessive load on the turntable at the beginning of the biological turntable 125 can be further improved.

It should be understood that the specific shape of the above-mentioned suspended filler 129 is not limited. The shape of the suspended filler 129 can be selected from the spherical shell provided in this embodiment, or can be selected from other shapes, for example, a cube, a rectangular parallelepiped, or processed into other suitable shapes according to actual needs.

To sum up, in the anaerobic ammonia oxidation tank 123, the biological turntable 125 arranged in a fan-shaped arrangement realizes the fan-shaped water inflow, which greatly improves the problem of excessive load on the starting end turntable of the biological turntable in the prior art. Because the annular inlet channel 126 distributes the inlet water evenly and arranges a large amount of waste water to the extension of the entire anammox tank 123, the water flow per unit length of the annular inlet channel 126 is much lower than that of other reactors. At the same time, the suspension fillers 129 are filled between the biological turntables 125, and the biological turntables 125 and the suspension fillers 129 work together. Therefore, for the biological turntables 125, the problem of excessive load on the start-end turntable is greatly improved. The diversion effect of the fan-shaped influent water and the rotation of the biological turntable 125 forms a mixed flow in the reactor which is superior to the ordinary push flow, and the hydraulic conditions are good. The biological turntable 125 rotates counterclockwise when viewed from the outside, and the co-rotation of the biological turntable 125 can bring about a diversion effect on the treated water flow. The diversion effect of the fan-shaped water inlet and the rotation of the biological turntable 125 is basically two effects in the vertical direction, and finally a mixed flow that is superior to the ordinary push flow is formed. At the same time, the diversion effect of the rotation of the biological turntable 125 also compensates for the unevenness of the multi-point water inflow. The influent load can be homogenized and apportioned to the entire reactor, the load of the starting turntable is reduced, and the utilization rate of the subsequent biological turntable 125 is improved, so that the volume utilization rate of the anammox tank 123 becomes higher, and the anaerobic The biological treatment efficiency of the ammonia oxidation pool 123 can be increased by 10%-20%.

The biological turntable 125 combines the technological characteristics of the moving bed biofilm. The biological turntable 125 is combined with the suspension filler 129 treatment, the number of biofilms per unit volume is increased, the biodegradability is strengthened, the efficiency of biological treatment is improved, and the efficiency of the reactor is improved. Overall pollutant removal efficiency.

This "wide inlet, narrow outlet" allows the anammox tank 123 to accelerate the shedding and metabolism of the biofilm. The efficiency and effect of the anammox tank 123 are improved. "Wide-mouth inlet, narrow-mouth outlet" means that the annular water inlet 126 is used for water inlet, and the annular water collecting tank 140 orifice is used for outflow. The water flow load per unit length on the 140 is doubled compared to the water flow load per unit length on the inlet channel, so there is water flow disturbance, which has shearing and impacting effects on the biofilm; at the same time, it can break the shackles of the suspended filler 129 and realize the flow of water to Annular sump 140 . The third aeration device 182 arranged at the bottom of the anaerobic ammonia oxidation tank 123 adopts intermittent aeration to provide oxygen for the biofilm on the suspended filler 129; at the same time, it has the effect of shearing and disturbing the water flow, which promotes the suspension of the biofilm and the aeration on the disk. Biofilm metabolism; under aerobic conditions, the excess biofilm produced is further consumed, which improves the overgrowth of biofilms on the bio-rotary disc 125.

CANON process is a combination of SHARON process and ANAMMOX process. The CANON process is both economical and efficient, and is especially suitable for the treatment of high ammonia nitrogen and low organic carbon sewage. Since the microorganisms involved in the CANON process are all autotrophs, no additional carbon source is required. In addition, the entire nitrogen removal process takes place in a single, micro-aerated reactor, which greatly reduces footprint and energy consumption. Compared with the traditional denitrification and denitrification process, this process can reduce the oxygen supply by 50-60% and the carbon source by 100%.

Please continue to refer to FIG. 1 , the anaerobic tank 121 is used for culturing the fixed filler 150 of anaerobic sludge. As a result, the output of sludge is low, and the cost of sludge treatment is low, thereby making the sewage treatment effect of the wastewater treatment reactor 100 good.

Further, the general water inlet pipe 160 of the wastewater treatment reactor 100 is arranged in the anaerobic tank 121 , and an underwater propeller 161 is arranged at the general water inlet pipe 160 .

This embodiment also provides a process method for treating wastewater, which utilizes the above-mentioned wastewater treatment reactor 100 for wastewater treatment. A combined process of "pre-ammonification/nitrosation-anaerobic ammonium oxidation (short-range CANON)-aerobic treatment" is formed: the anaerobic tank 121 constitutes the anaerobic section, which mainly cultivates anaerobic ammoniated bacteria, and transforms organic Nitrogen is converted into ammonia nitrogen, and the dissolved oxygen in the anaerobic section is controlled at 0-0.2 mg/L; the anaerobic tank 121 constitutes an anoxic section, which mainly cultivates facultative nitrosating bacteria, and the dissolved oxygen in the anoxic section is controlled at 0.2-2.0 mg/L, in order to carry out the biological reaction of nitrification in the anoxic section, and convert NH ₄ ⁺ into NO ₂ ^- ; the anammox tank 123 constitutes the anammox section, which mainly cultivates anammox bacteria, and anaerobic The dissolved oxygen in the ammonia oxidation section is controlled at 0.3-1.0 mg/L, so that the biological reaction of anaerobic ammonia oxidation can be carried out here; the activated sludge is cultivated in the aerobic section, which mainly removes the organic substances in the water, and the phosphorus-accumulating bacteria are under aerobic conditions. Excessive absorption of inorganic phosphorus in water, the dissolved oxygen in the aerobic section is controlled to be greater than 2.0mg/L.

Further, by controlling the rotation angle (the angle between the diverter door 170 and the retaining wall 185), the flow ratio of the anaerobic tank 121 entering the anoxic tank 122 and entering the annular confluence tank 130 is adjusted, and then the waste water after the confluence of the annular confluence tank 130 is controlled. The concentration ratio of NO ₂ ^- /NH ₄ ⁺ in the main body makes the concentration ratio of NO ₂ ^- /NH ₄ ⁺ entering the anammox section of the main body within the range of 1.20-1.35.

Further, in the overall process of the process method for treating wastewater, the nitrogen removal load is 3.0-5.0 kgN/(m ³ .d).

In general, the basic principles of the above-mentioned process method for wastewater treatment by the wastewater treatment reactor 100 are as follows:

The anammox section adopts the "short-range CANON" process. In the anammox section, the wastewater relies on the anammox bacteria group cultivated on the biological turntable and the suspended packing, and uses NH ₄ ⁺ and NO ₂ ^- as the reactants to carry out the anammox biochemical reaction and convert it into N ₂ , which is the main reaction that occurs. NO ₂ ^- can also be used as an electron donor for microbial synthesis, and CO ₂ is an electron acceptor. In this process, NO ₂ ^- is oxidized by CO ₂ to form NO ₃ ^- .

In general, the feed water of CANON process is raw water, and then through ammoniation and nitrosation, the NO ₂ ^- /NH ₄ ⁺ concentration ratio in the water is basically close to 1. Then carry out anaerobic ammonia oxidation. The interaction of aerobic bacteria and anammox bacteria under oxygen-limited conditions will make NH ₄ ⁺ completely converted to N ₂ , and a small amount of NO ₃ ^- will also be produced. The whole process is self-supporting, and no external carbon source is required. The feed water of the CANON process is not required for NH ₄ ⁺ and NO ₂ ^- per se.

The influent of the "short-range CANON" process in the present invention is the waste water that has undergone anaerobic stage ammoniation and anoxic stage nitrosation, and the concentration ratio of NO ₂ ⁻ /NH ₄ ⁺ is regulated to be 1.20-1.35. Therefore, the short-range CANON process basically only needs to use NH ₄ ⁺ and NO ₂ ^- as the reactants for the anammox biochemical reaction, which shortens the biochemical reaction process and improves the biological treatment efficiency and treatment load. The overall process, nitrogen removal load is 3.0-5.0kgN/(m ³ ˙d). The total nitrogen removal rate is greater than 90%, and the ammonia nitrogen removal rate is greater than 95%.

In the short-range CANON process, because the NO ₂ ^- /NH ₄ ⁺ concentration ratio is suitable, the nitrosation process is omitted, and the biochemical reaction can be directly carried out under the action of anammox bacteria:

NH ₄ ⁺ +1.32NO ₂ ^- +0.066HCO ₃ ^- +0.13H ⁺ →1.02N ₂ +0.26NO ₃ ^- +0.066CH ₂ O _0.5 N _0.15 +2.03H ₂ O

The biofilm reactor has the strongest resistance to substrate concentration shock, which is stronger than that of the granular sludge bed reactor. The resistance to hydraulic load shock is also the strongest among various reactors. The anti-substrate concentration shock ability of the bio-rotating disk combined with the moving bed is better than that of the general biofilm reactor.

And for the wastewater with the NO ₂ ^- /NH ₄ ⁺ concentration ratio exceeding the range, the "short-range CANON" process also has a certain buffering capacity. Even if the range of NO ₂ ^- /NH ₄ ⁺ concentration ratio is less than 1.20 for a short period of time, the "short-range CANON" process has a certain buffer capacity. When the influent NH ₄ ⁺ is too high, some aerobic bacteria in the short-range CANON process can still go smoothly. The excess NH ₄ ⁺ is oxidized to NO ₂ ^- , and the anammox biochemical reaction is further carried out. This is because the biofilm on the biological turntable is partly in contact with the air, and there are aerobic nitrifying bacteria and nitrosifying bacteria. As the carrier of microorganisms, the disk forms a certain anaerobic zone and aerobic zone on the turntable during the formation of biofilm. The NH ₄ ⁺ in the aerobic zone of the outer layer of the biological turntable is partially oxidized to NO ₂ ^- ; the unreacted NH ₄ ⁺ and the generated NO ₂ ^- enter the inner anaerobic zone, and further react to release nitrogen gas, and a small amount of NO at the same time ₂ ^- ; further oxidation generates NO ₃ ^- , which provides necessary electrons for the growth of microorganisms.

In the present invention, it is only necessary to pay attention to when the influent NO ₂ ^- /NH ₄ ⁺ concentration ratio range of the short-range CANON process is greater than 1.35, it should be adjusted through the diverter door, and the NO ₂ ^- should not be too long for a long time. Thus, the degree of strictness required for the restriction of dissolved oxygen in the ammoniation stage of the anaerobic stage is greatly reduced. The anaerobic section is mainly ammonium oxidizing bacteria, the anoxic section is mainly nitrosifying bacteria, and the anammox section is mainly anaerobic ammonium oxidizing bacteria, not mixed with a large number of other bacteria. This not only improves the efficiency of biological treatment, but also relaxes the environmental conditions for culturing the flora.

The process method for treating wastewater provided by the embodiment of the present invention, combined with a large number of experiments, screened out the best combined process method, and combined "pre-ammonization/nitrosation-anaerobic ammonia oxidation (short-range CANON)-aerobic treatment" in an orderly and organic manner Combined with the ground, each section supports each other in terms of regulation functions, and a new conceptual scheme for denitrification and phosphorus removal of wastewater is proposed.

The pre-ammonification/nitrosation serves the anaerobic ammonium oxidation (short-range CANON), and the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the anammox influent is in the range of 1.20-1.35. The short-range CANON process is formed by anaerobic ammonia oxidation, mainly using the biological turntable process, which is further processed for pre-ammonia/nitrosation, and is also the main denitrification section. In the aerobic stage, the organic substances in the water are mainly removed, and the phosphorus accumulating bacteria absorb excessive inorganic phosphorus in the water under aerobic conditions. The phosphorus removal efficiency of the whole process is improved, and the COD treatment is guaranteed to meet the standard, and the removal rate of NH ₄ ⁺ in water can also be guaranteed to be greater than 95%.

After the combination, the overall process method is more efficient, more economical and more stable. The process operation is stable and reliable, and it is resistant to impact load. The sludge output is small, the sludge treatment cost is low, and the sewage treatment effect is good, which is of great significance to environmental protection. The anti-substrate concentration shock capability of the bio-rotating disk combined with the moving bed is better than that of the general biofilm reactor, and even better than other types of reactors. And for the wastewater with the NO ₂ ^- /NH ₄ ⁺ concentration ratio exceeding the range, the short-range CANON process also has a certain buffering capacity. The characteristics of the biological turntable itself are less sludge output, low sludge treatment cost and low energy consumption. It has the strengthening effect of the suspended packing moving bed, and the biological treatment efficiency is higher. The fan-shaped arrangement and mixed flow improve the volume utilization rate of the anammox section. During anammox denitrification, a short-range CANON process is formed. Compared with denitrification, the oxygen demand is reduced by 50-60%, and no additional carbon source is required. The entire combined process increases biological treatment efficiency and treatment load.

In summary, the wastewater treatment reactor provided by the present invention and the process method for treating wastewater have the following technical effects:

1. The reactor provided by the present invention has a unique arrangement and an optimized structure, which is easy to control the NO ₂ ⁻ /NH ₄ ⁺ concentration ratio of the anammox section of the main body, and improves the efficiency of biological denitrification treatment.

2. By arranging the biological turntable in a fan-shaped arrangement, the fan-shaped water inflow is realized, which greatly improves the problem of excessive load on the start-end turntable of the biological turntable in the prior art. The diversion effect of the fan-shaped water inlet and the rotation of the turntable forms a mixed flow in the reactor that is superior to the ordinary push flow, and the hydraulic conditions are good, which makes the volume utilization rate of the biological turntable higher and improves the biological treatment efficiency of the wastewater treatment reactor.

In the anammox section, the biological turntable combines the process characteristics of the moving bed biofilm, and the biological turntable is combined with the suspended filler treatment, the number of biofilms per unit volume increases, the biodegradability is strengthened, the efficiency of biological treatment is improved, and the the overall pollutant removal efficiency of the reactor.

3. "Wide inlet water, narrow outlet water" enables the biological turntable to speed up the shedding and metabolism of the biofilm. The anammox section adopts the biological turntable process, the sludge age is long, the energy consumption is low, and the oxygen demand is reduced by 50-60% during anammox denitrification.

4. The process method for treating wastewater provided by the present invention has reasonable process route, clear and orderly treatment mechanism, and high nitrogen and phosphorus removal efficiency. The concentration ratio of NO ₂ ⁻ /NH ₄ ⁺ in the main anammox process section is easy to control, and the efficiency of biological denitrification treatment is improved.

5. The process method for treating wastewater provided by the present invention is combined with a large number of experiments to screen out the best combined process method, and the orderly and organic Combined with the ground, each section supports each other in terms of regulation functions, and a new conceptual scheme for denitrification and phosphorus removal of wastewater is proposed. After the combination, the overall process method is more efficient, more economical and more stable. The process operation is stable and reliable, and it is resistant to impact load. The sludge output is small, the sludge treatment cost is low, and the sewage treatment effect is good, which is of great significance to environmental protection.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. a waste water treatment reactor, is characterized in that, described waste water treatment reactor is arranged as a circular pool body, and described pool body comprises inner ring pool and outer ring pool, described inner ring pool and described outer ring pool An annular confluence tank and an annular water collecting tank are arranged between the pools; the outer ring pools are divided into anaerobic pools, anoxic pools and anaerobic ammonia oxidation pools in sequence according to the flow direction of the water flow; the anaerobic pools and anoxic pools are annular as a whole. Corridor style, anammox tank is fan-shaped; The general water inlet pipe is located at the beginning of the anaerobic tank, an underwater propeller is arranged on the tank wall of the anaerobic tank to enhance the flow of water, and a fixed filler for culturing anaerobic sludge is arranged in the anaerobic tank, The anaerobic tank is communicated with the annular confluence groove, and part of the effluent flows into the annular confluence groove; A rotatable shunt door is arranged between the anaerobic pond and the anoxic pond, and the angle between the shunt door and the retaining wall constitutes a rotation angle, and the range of the rotation angle is 30°-150°. Rotate the diverter door, turn the diverter door to the required position and fix it, the diverter door cuts the effluent flow of the anaerobic tank, and the diverter door has the function of diverting the effluent of the anaerobic tank. The waste water on one side of the diverting door on the retaining wall enters the annular confluence tank, and the waste water on the other side of the diverting door enters the anoxic tank; Part of the effluent of the anaerobic pond flows into the anoxic pond; the interior of the anoxic pond is further divided into 3 corridors, the bottom of the anoxic pond is provided with a first aeration system, and the effluent of the anoxic pond flows into the The annular confluence groove; The annular confluence tank collects the effluent of the anaerobic tank and the anoxic tank, and the tank body also includes a water delivery pipe and a transfer pump, so that the confluent wastewater in the annular confluence tank can be transferred to the Anaerobic ammonia oxidation tank; A plurality of groups of biological turntables for treating waste water are arranged inside the anammox tank, an annular water inlet channel is arranged on the outer periphery of the anammox ammonium oxidation tank, and a plurality of water inlet branch pipes are arranged on the annular water inlet channel; The water outlets of the water inlet branch pipes are all connected to the annular water channel; the water inlets of the plurality of water inlet branch pipes are connected to the water delivery pipes; The annular water collecting tank collects the wastewater treated by the anammox tank through the outflow of the orifice; the water storage level of the anammox tank is two-thirds to four-thirds of the height of the disk of the installed biological turntable three-thirds; The inner ring pool is an aerobic pool, the inflow water of the aerobic pool comes from the annular water collecting tank, the bottom of the annular water collecting tank is communicated with the aerobic pool, and the bottom of the aerobic pool is provided with a second aeration device, so the The aerobic tank is communicated with the total outlet tank. 2 . The wastewater treatment reactor according to claim 1 , wherein a suspended filler for providing a carrier for the growth of biofilms is arranged between each two groups of the biological turntables, and each group of the biological turntables is provided with a suspension filler. 3 . It rotates counterclockwise when viewed from the outside of the wastewater treatment reactor. 3 . The wastewater treatment reactor according to claim 2 , wherein the suspended filler comprises a spherical shell and a carrier for fixing biofilms arranged in the shell, and the diameter of the shell is 10～10 . 30mm, the diameter is greater than the distance between every two discs of each group of the biological turntables, and the shell is made of high-molecular polymer injection molding, and the high-molecular polymer is polypropylene or polyethylene; The material of the built-in carrier is a porous material with a specific gravity of less than 1, and the density of the porous material is 0.90-0.96 g/cm ³ . 4 . The wastewater treatment reactor according to claim 3 , wherein a third aeration device is provided at the bottom of the anammox tank, and the third aeration device adopts the mode of intermittent aeration. 5 . 5. a process method for treating waste water, is characterized in that, utilizes the waste water treatment reactor as described in any one of claim 1-4 to carry out waste water treatment, has formed " pre-ammonification/nitrosation-anammox -Aerobic treatment" combined process: The anaerobic tank constitutes an anaerobic section, which mainly cultivates anaerobic ammonizing bacteria groups to convert organic nitrogen into ammonia nitrogen, and the dissolved oxygen of the wastewater in the anaerobic section is controlled at 0-0.2 mg/L; The anoxic pond constitutes an anoxic section, mainly cultivating facultative nitrosating bacteria groups, and the dissolved oxygen of the wastewater in the anoxic section is controlled at 0.2-2.0 mg/L, so as to carry out nitrosation in the anoxic section. The reaction converts NH ₄ ⁺ into NO ₂ ^- ; The anammox tank constitutes an anammox section, which mainly cultivates anammox bacteria, and the dissolved oxygen of the wastewater in the anammox section is controlled at 0.3-1.0mg/L, so that anammox is carried out here. Oxidative biological reactions; The activated sludge is cultivated in the aerobic section, which mainly removes the organic substances in the water, and at the same time, the phosphorus-accumulating bacteria absorbs the inorganic phosphorus in the water excessively under aerobic conditions. 6. The process method for treating wastewater according to claim 5, wherein the flow ratio of the anaerobic pond entering the anoxic pond and entering the annular confluence groove is regulated by controlling the angle of rotation, wherein the The rotation angle is the angle between the diverter door and the retaining wall, so as to control the NO ₂ ^- /NH ₄ ⁺ concentration ratio in the wastewater after the confluence of the annular confluence groove, so that the NO ₂ ^- /NH ₄ ⁺ concentration ratio in the range of 1.20-1.35. 7 . The process method for treating wastewater according to claim 5 , wherein, in the overall process of the process method for treating wastewater, the nitrogen removal load is 3.0-5.0 kgN/(m ³ .d). 8 .

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