CN217895375U - Filtering tank and sewage treatment device - Google Patents

Abstract

The utility model discloses a filtering tank and sewage treatment plant. The filtering tank includes: a filter tank main body; the backwashing component comprises a backwashing aeration pipe and a first baffle, the first baffle is provided with a plurality of backwashing water distribution ports, the plurality of backwashing water distribution ports are communicated with the backwashing water inlet, and the backwashing aeration pipe is provided with a plurality of backwashing aeration holes; the first filter layer is arranged above the first baffle, the top of the first filter layer is higher than the top of the backwashing aeration pipe, the first filter layer comprises a plurality of hard filter bodies, and a plurality of cutting gaps are formed among the hard filter bodies; and the second filter layer is arranged above the first filter layer, the water inlet and the backwashing water outlet are higher than the top of the second filter layer, and the second filter layer comprises a plurality of soft filter bodies. The filter tank can improve the back washing effect of the filter body.

Description

Filtering tank and sewage treatment device

Technical Field

The utility model relates to a sewage treatment technical field, in particular to filtering ponds and sewage treatment plant.

Background

In the field of sewage treatment technology, after sewage is biochemically treated by a biochemical treatment tank of a sewage treatment device, the sewage is usually introduced into a filter tank, and a filter layer in the filter tank can filter and retain suspended substances in the sewage, so that the sewage is converted into clear water. The traditional filtering tank usually adopts a plurality of stages of filtering plates to fill different sizes of soft filtering bodies so as to form different filtering layers, and the filtering layers filled by the method have complex structure and troublesome filling; and the filter plates are closely arranged, the filter bodies are regularly arranged, when the filter bodies of the filter tank are backwashed, the friction among the filter bodies is not large, the scouring force is insufficient, and dirt cannot be effectively peeled from the surfaces of the filter bodies, so that a better backwashing effect is difficult to obtain.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a filter tank can improve the back flush effect to crossing the filter body.

The utility model discloses still provide a sewage treatment plant who has above-mentioned filtering ponds.

According to the utility model discloses filtering ponds of first aspect embodiment, include: the filter tank comprises a filter tank main body, a filter tank main body and a filter tank, wherein the filter tank main body is provided with a filter space, a water inlet, a water outlet, a back flush water inlet and a back flush water outlet, the water inlet, the water outlet, the back flush water inlet and the back flush water outlet are all communicated with the filter space, the water outlet is arranged below the water inlet, and the back flush water inlet is arranged below the back flush water outlet; the backwashing component comprises a backwashing aeration pipe and a first baffle, the backwashing aeration pipe and the first baffle are arranged in the filtering space, the backwashing aeration pipe and the first baffle are arranged between a backwashing water inlet and a backwashing water outlet, the backwashing aeration pipe is arranged above the first baffle, the first baffle is provided with a plurality of backwashing water distribution ports, the backwashing water distribution ports are communicated with the backwashing water inlet, and the backwashing aeration pipe is provided with a plurality of backwashing aeration holes; the first filter layer is arranged above the first baffle, the top of the first filter layer is higher than the top of the backwashing aeration pipe, the first filter layer comprises a plurality of hard filter bodies, and a plurality of cutting gaps are formed among the hard filter bodies; and the second filter layer is arranged above the first filter layer, the water inlet and the backwashing water outlet are higher than the top of the second filter layer, and the second filter layer comprises a plurality of soft filter bodies.

According to the utility model discloses filtering ponds has following beneficial effect at least:

in the above-mentioned filtering tank, after the biochemical treatment of the biochemical treatment unit, the sewage can enter the filtering space of the filtering tank main body through the water inlet, so that suspended substances in the sewage can be removed in the filtering space. In the process of removing suspended substances in the filtering space, sewage can sequentially pass through the second filtering layer, the first filtering layer and the first baffle and is finally discharged through the water outlet. In the process that sewage flows through the second filter layer and the first filter layer, suspended substances in the sewage are continuously adhered to the second filter layer and the first filter layer, the pores in the second filter layer and the pores in the first filter layer are gradually reduced, the water flow resistance is continuously increased, when the flow rates of the second filter layer and the first filter layer reach a minimum allowable value or when the filtered water quality is close to an over-standard value, the operation of the filter tank is stopped, and the second filter layer and the first filter layer are backwashed.

When the second filter layer and the first filter layer are backwashed, backwash water can enter the filter space through the backwash water inlet until the liquid level of the backwash water overflows the top of the second filter layer, the backwash water can be stopped from entering the filter space, and meanwhile, the backwash aeration pipe aerates the filter space, so that the second filter layer and the first filter layer can be subjected to the air-water combined washing effect. In the process, backwash water can sequentially enter the first filter layer and the second filter layer through the plurality of backwash water distribution openings on the first baffle, and backwash gas in the backwash aeration pipe can sequentially enter the first filter layer and the second filter layer through the plurality of backwash aeration holes. When the back washing water and the back washing gas enter the first filter layer, the back washing water can be cut into fine flow and quickly upwelled by the cutting gaps among the plurality of first filter bodies in the first filter layer, and the back washing gas can be cut into small bubbles by the cutting gaps among the plurality of first filter bodies in the first filter layer and quickly ascends along with upwelled water flow. Therefore, the soft filtering bodies in the second filtering layer can float upwards and roll violently under the action of the air-water combined upflow, and at the moment, an air-water turbulent flow state is formed in the filtering space, so that the soft filtering bodies can rub against each other and billow upwards and downwards. The air-water combined flushing effect and the violent mutual friction among the plurality of soft filtering bodies can well peel off the adhered substances on the outer layer of the soft filtering bodies, and the scraping of a stirring device is avoided in the back flushing process of the soft filtering bodies, so that the outer layer structure of the soft filtering bodies is not easily damaged, and the condition of wire drawing is avoided.

In the process, the dead weight of the first filter layer is light, so that the hard filter body in the first filter layer can be well cleaned when the first filter layer is backwashed. And because the second filter layer is arranged above the first filter layer, and the top of the first filter layer is higher than the top of the backwashing aeration pipe, the first filter layer can also prevent the second filter layer from clinging to the backwashing water distribution port on the first baffle plate when filtering sewage, and the influence of the speed and the water yield of the water outlet in the process of filtering the sewage by the filter tank is avoided. Meanwhile, a plurality of cutting gaps formed among the plurality of hard filtering bodies of the first filtering layer can cut back washing water and back washing gas, so that the back washing water and the back washing gas can have stronger impact force, and a better cleaning effect can be achieved on the second filtering layer. Therefore, in the process of backwashing the filter layers, not only can the interior of the first filter layer obtain a better cleaning effect, but also the surface of the soft filter body of the second filter layer can be cleaned, and therefore, the filter tank can improve the backwashing effect on the filter body.

According to some embodiments of the utility model, the filtering ponds still include a plurality of water distribution heads, and are a plurality of water distribution heads set up a plurality of one-to-one on the back flush water distribution mouth.

According to some embodiments of the invention, the first baffle is further arranged between the water inlet and the water outlet.

According to some embodiments of the present invention, the backwash aeration pipe comprises a first aeration pipe and a second aeration pipe, the first aeration pipe is enclosed along the inner side wall of the filter tank main body to form an end-to-end annular structure, the number of the second aeration pipes is multiple, the second aeration pipes are arranged at intervals inside the annular structure, and both ends of each of the second aeration pipes are communicated with the first aeration pipe;

the first aeration pipe and the second aeration pipe are provided with a plurality of backwashing aeration holes at intervals.

According to some embodiments of the utility model, still be provided with the second baffle in the filtration space, the second baffle setting at the water inlet and the below of back flush delivery port, just the second baffle sets up the top of first baffle, first filter layer and the second filter layer all sets up first baffle and between the second baffle.

According to some embodiments of the present invention, the filtering space is further provided with a water inlet distribution pipe, the water inlet distribution pipe is disposed above the second baffle, the water inlet distribution pipe includes a first water distribution pipe and a second water distribution pipe, one end of the first water distribution pipe is communicated with the water inlet, the other end of the first water distribution pipe extends towards the inside of the filtering tank main body, the number of the second water distribution pipes is multiple, the multiple second water distribution pipes are arranged on the first water distribution pipe at intervals, and each of the second water distribution pipes is communicated with the first water distribution pipe;

and a plurality of water inlet and distribution ports are arranged on the first water distribution pipe and the second water distribution pipe at intervals.

According to the utility model discloses a some embodiments, a plurality of holes that leak of having arranged at the interval on the second baffle, and every the water inlet and distribution mouth all with every the hole intercommunication leaks.

According to some embodiments of the utility model, the filtering ponds still include back flush inlet tube, water pump and first valve, the one end of back flush inlet tube with back flush water inlet intercommunication, the other end of back flush inlet tube with the water pump is connected, first valve setting is in on the back flush inlet tube.

According to the utility model discloses sewage treatment plant of second aspect embodiment includes: a filtration tank as described above; the biochemical treatment unit comprises a biochemical tank, a sedimentation tank and a sedimentation water outlet tank, wherein a water outlet of the biochemical tank is communicated with a water inlet of the sedimentation tank, a water outlet of the sedimentation tank is communicated with a water inlet of the sedimentation water outlet tank, and a water outlet of the sedimentation water outlet tank is communicated with the water inlet.

According to the utility model discloses sewage treatment plant has following beneficial effect at least:

in the above sewage treatment device, the sewage is subjected to biochemical treatment in the biochemical tank, the sedimentation tank and the sedimentation water outlet tank in sequence to remove organic pollutants in the sewage and enable sludge in the sewage to reach the discharge standard. The sewage flowing out of the biochemical treatment unit can enter a filter tank to remove suspended substances in the sewage. Because the filter tank in the sewage treatment device can improve the back flushing effect of the filter body, the sewage can have better water outlet quality and water outlet speed after being decontaminated by the sewage treatment device.

According to some embodiments of the utility model, the biochemical pond has biochemical pond aeration pipe, sewage treatment plant still includes air pump, second valve and third valve, biochemical pond aeration pipe and back flush aeration pipe all with the air pump is connected, the second valve sets up biochemical pond aeration pipe is close to one of air pump is served, the third valve sets up back flush aeration pipe is close to one of air pump is served.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

fig. 1 is a schematic structural diagram of a filtration tank according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a filtration tank according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a backwash aeration pipe according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first baffle according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a water inlet and distribution pipe according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a sewage treatment apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural view of an aeration pipe of a biochemical tank and a back-washing aeration pipe according to an embodiment of the present invention.

Reference numerals:

100. a filter tank main body; 110. filtering the space; 120. a water inlet; 130. a water outlet; 140. backwashing the water inlet; 150. backwashing a water outlet; 160. back flushing the air outlet;

200. a backwash assembly; 210. backwashing the aeration pipe; 211. backwashing the aeration holes; 212. a first aeration pipe; 213. a second aeration pipe; 220. a first baffle plate; 221. backwashing the water distribution port; 222. a water distribution head;

300. a hard filter body; 310. a first filter layer;

400. a soft filter body; 410. a second filter layer;

500. a second baffle;

600. a water inlet and distribution pipe; 610. a first water distribution pipe; 620. a second water distribution pipe; 630. a water inlet and distribution port;

710. a biochemical pool; 711. an aeration pipe of the biochemical tank; 720. a sedimentation tank; 730. a sedimentation water outlet pool;

810. a second valve; 820. a third valve;

900. a liquid level meter.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the present invention, such as the upper and lower directions, is the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, the utility model discloses a filtering ponds of embodiment includes: a filter tank body 100, a backwash assembly 200, a first filter layer 310, and a second filter layer 410.

Specifically, the filter tank body 100 is provided with a filter space 110, a water inlet 120, a water outlet 130, a backwash water inlet 140 and a backwash water outlet 150, the water inlet 120, the water outlet 130, the backwash water inlet 140 and the backwash water outlet 150 are all communicated with the filter space 110, the water outlet 130 is arranged below the water inlet 120, and the backwash water inlet 140 is arranged below the backwash water outlet 150; the backwashing component 200 comprises a backwashing aeration pipe 210 and a first baffle 220, the backwashing aeration pipe 210 and the first baffle 220 are both arranged in the filtering space 110, the backwashing aeration pipe 210 and the first baffle 220 are both arranged between the backwashing water inlet 140 and the backwashing water outlet 150, the backwashing aeration pipe 210 is arranged above the first baffle 220, the first baffle 220 is provided with a plurality of backwashing water distribution ports 221, the plurality of backwashing water distribution ports 221 are communicated with the backwashing water inlet 140, and the backwashing aeration pipe 210 is provided with a plurality of backwashing aeration holes 211; the first filter layer 310 is arranged above the first baffle 220, the top of the first filter layer 310 is higher than the top of the backwash aeration pipe 210, the first filter layer 310 comprises a plurality of hard filter bodies 300, and a plurality of cutting gaps are formed among the plurality of hard filter bodies 300; the second filtering layer 410 is disposed above the first filtering layer 310, and the water inlet 120 and the back flush water outlet 150 are both higher than the top of the second filtering layer 410, and the second filtering layer 410 includes a plurality of soft filtering bodies 400.

More specifically, the soft filter 400 is a fiber ball filter, and the hard filter is a quartz sand filter.

Further, the diameter of the fiber ball filter body ranges from 3cm to 4cm, and the height of the second filter layer 410 ranges from 40cm to 60 cm; the top of the first filter layer 310 is about 5cm higher than the top of the back flush aeration pipe 210, the diameter of the quartz sand filter body ranges from 8cm to 16cm, the quartz sand filter body with the diameter ranging from 8cm to 16cm has large water permeability, and has cutting effect on water flow and air flow, thereby achieving the effects of water distribution and air distribution.

In the above-described filter tank, the sewage after being biochemically treated by the biochemical treatment unit can enter the filtering space 110 of the filter tank main body 100 through the water inlet 120, so that suspended substances in the sewage can be removed in the filtering space 110. In the process of removing suspended matters from the sewage in the filtering space 110, the sewage can sequentially pass through the second filtering layer 410, the first filtering layer 310 and the first baffle 220, and finally is discharged through the water outlet 130. In the process of sewage flowing through the second filter layer 410 and the first filter layer 310, suspended matters in the sewage are continuously adhered to the second filter layer 410 and the first filter layer 310, pores in the second filter layer 410 and pores in the first filter layer 310 are gradually reduced, water flow resistance is continuously increased, when the flow rate of the second filter layer 410 and the first filter layer 310 reaches a minimum allowable value or when the filtered water quality approaches an over-standard value, the operation of the filter tank is stopped, and the second filter layer 410 and the first filter layer 310 are backwashed.

When the second filter layer 410 and the first filter layer 310 are backwashed, the backwash water can enter the filter space 110 through the backwash water inlet 140 until the liquid level of the backwash water overflows the top of the second filter layer 410, the entry of the backwash water can be stopped, and the backwash aeration pipe 210 aerates the filter space 110, so that the second filter layer 410 and the first filter layer 310 can be subjected to the combined air-water flushing. In the process, the backwash water can sequentially enter the first filter layer 310 and the second filter layer 410 through the plurality of backwash water distribution openings 221 on the first baffle 220, and the backwash gas in the backwash aeration pipe 210 can sequentially enter the first filter layer 310 and the second filter layer 410 through the plurality of backwash aeration holes 211. When back washing water and back washing gas enter the first filter layer 310, the back washing water can be cut into fine flow fast upwelling by the cutting gaps between the plurality of first filter bodies in the first filter layer 310, and the back washing gas can be cut into small bubbles by the cutting gaps between the plurality of first filter bodies in the first filter layer 310 to rise fast with the upwelling water flow. In this way, the plurality of soft filters 400 in the second filter layer 410 can float upward and tumble violently under the action of the combined upflow of air and water, and at this time, a turbulent air-water flow is formed in the filter space 110, so that the plurality of soft filters 400 can rub against each other and billow up and down. The air-water combined flushing effect and the violent mutual friction among the plurality of soft filter bodies 400 can well peel off the adhered substances on the outer layers of the soft filter bodies 400, no stirring device scrapes the soft filter bodies 400 in the back flushing process, the outer layer structure of the soft filter bodies 400 is not easily damaged, and the wire drawing condition is avoided.

In this process, the first filter layer 310 has a light weight, so that the hard filter 300 inside the first filter layer 310 can be well cleaned when the first filter layer 310 is backwashed. And because the second filter layer 410 is arranged above the first filter layer 310, and the top of the first filter layer 310 is higher than the top of the backwash aeration pipe 210, the first filter layer 310 can also prevent the second filter layer 410 from clinging to the backwash water distribution port 221 on the first baffle 220 when filtering sewage, so as to avoid the influence of the speed and the water yield of the effluent in the process of filtering sewage by the filter tank. Meanwhile, a plurality of cutting gaps formed between the plurality of hard filter bodies 300 of the first filter layer 310 can cut backwash water and backwash gas, so that the backwash water and the backwash gas can have stronger impact force, and a better cleaning effect can be provided for the second filter layer 410. In this way, in the process of backwashing the filter layers, not only can the inside of the first filter layer 310 be cleaned well, but also the surface of the soft filter body 400 of the second filter layer 410 can be cleaned, and therefore, the above-mentioned filter tank can improve the backwashing effect on the filter body.

Referring to fig. 1, 2 and 4, it can be understood that the filtering tank further includes a plurality of water distribution heads 222, and the plurality of water distribution heads 222 are correspondingly disposed on the plurality of backwash water distribution ports 221.

Thus, the water distribution heads 222 can make the backwash water form a washing water column, so that the backwash water entering the filtering space 110 from the backwash water inlet 120 can be divided by the water distribution heads 222 to form a water column, so that the backwash water forms a trickle with a larger impact force, and the backwash water can have a stronger cleaning force, thereby improving the cleaning effect of the soft filtering layer.

Referring to fig. 1 and 2, it can be understood that the first baffle 220 is also disposed between the water inlet 120 and the water outlet 130.

Thus, when sewage sequentially passes through the water inlet 120, the second filter layer 410, the first filter layer 310 and the water outlet 130, the soft filter 400 in the first filter layer 310 and the hard filter 300 in the second filter layer 410 are not lost or blocked at the water outlet 130, so that the influence on the water outlet speed can be avoided.

Referring to fig. 1 and 3, it can be understood that the backwash aeration pipe 210 includes a first aeration pipe 212 and a second aeration pipe 213, the first aeration pipe 212 is enclosed along the inner side wall of the filter tank body 100 to form an end-to-end annular structure, the number of the second aeration pipes 213 is multiple, the multiple second aeration pipes 213 are arranged at intervals inside the annular structure, and both ends of each second aeration pipe 213 are communicated with the first aeration pipe 212; wherein, a plurality of back washing aeration holes 211 are arranged at intervals on the first aeration pipe 212 and the second aeration pipe 213.

Thus, the first aeration pipe 212 and the plurality of second aeration pipes 213 can cover the bottom of the second filter layer 410, so that the plurality of backwashing aeration holes 211 arranged at intervals on the first aeration pipe 212 and the second aeration pipe 213 can enable the backwashing gas to be uniformly cut by the plurality of backwashing aeration holes 211, so that the gas and the water can be more uniformly mixed, and a better cleaning effect can be achieved. In addition, the backwash air entering the filtering space 110 from the backwash aeration pipe 210 and the backwash water can perform air-water combined washing action on the filtering layer, and no additional stirring device or vibration equipment is needed in the process, so that the equipment cost and energy consumption can be reduced.

Referring to fig. 1 and 2, it can be understood that a second baffle 500 is further disposed in the filtering space 110, the second baffle 500 is disposed below the water inlet 120 and the backwash water outlet 150, the second baffle 500 is disposed above the first baffle 220, and the first and second filter layers 310 and 410 are disposed between the first and second baffles 220 and 500.

In this way, when the first filter layer 310 and the second filter layer 410 are backwashed, the second baffle 500 can prevent the soft filter 400 in the second filter layer 410 from flowing out of the backwash water outlet 130, and can also prevent the soft filter 400 in the second filter layer 410 from blocking the backwash water outlet 130.

In addition, the soft filter bodies 400 in the second filter layer 410 float upwards and roll violently under the action of the air-water combined upward flow, and the soft filter bodies 400 float upwards to the position below the second baffle 500 and can be intercepted by the second baffle 500, and due to the strong upward thrust of the air-water combined upward flow, part of the soft filter bodies 400 in the second filter layer 410 can be flushed to two sides after propping against the second baffle 500, so that a flow state similar to that of a drum washing machine is formed; the turbulent air-water turbulence and the violent mutual friction between the soft filter bodies 400 in the second filter layer 410 have good stripping effect on the adhered matters on the outer layers of the soft filter bodies 400 in the second filter layer 410, so that a good backwashing effect is realized, and the dosage of backwashing water can be reduced.

Referring to fig. 1, 2 and 5, it can be understood that an inlet water distributor 600 is further disposed in the filtering space 110, the inlet water distributor 600 is disposed above the second baffle 500, the inlet water distributor 600 includes a first water distributor 610 and a second water distributor 620, one end of the first water distributor 610 is communicated with the water inlet 120, the other end of the first water distributor 610 extends towards the interior of the filtering tank main body 100, the number of the second water distributors 620 is multiple, the multiple second water distributors 620 are arranged on the first water distributors 610 at intervals, and each second water distributor 620 is communicated with the first water distributor 610; a plurality of water inlet and distribution openings 630 are arranged on the first water distribution pipe 610 and the second water distribution pipe 620 at intervals.

In this way, when the sewage enters the filtering space 110 from the water inlet 120, the sewage can first enter the first water distributor 610 and the second water distributor 620, and then enter the second filtering layer 410 through the plurality of water inlet distribution holes 630 arranged at intervals on the first water distributor 610 and the second water distributor 620. In the process, the water inlet and distribution pipe 600 can distribute water uniformly to prevent local water inlet, so that the treatment load of the local soft filtering body is prevented from being larger, that is, the quality of suspended matters adsorbed by the local soft filtering body 400 is easily prevented from being overlarge, thereby facilitating the back washing of the soft filtering body 400 in the later period, prolonging the service life of the soft filtering body 400, and simultaneously improving the quality of the outlet water of the filtering tank.

Referring to fig. 1 and 2, it can be understood that a plurality of water leakage holes (not shown) are arranged at intervals on the second baffle 500, and each water inlet and distribution port 630 is communicated with each water leakage hole.

Specifically, the diameter of the water leakage hole ranges from 1cm to 3 cm. If the diameter of the water leakage hole is larger than 3cm, the soft filter 400 may pass through the water leakage hole after floating up when the first filter layer 310 is backwashed, which may cause the soft filter 400 to run off or block the backwash water outlet 130; if the diameter of the water leakage hole is smaller than 1cm, sewage is not facilitated to flow to the second filter layer 410 through the water leakage hole, and backwashing water is also not facilitated to flow to the backwashing water outlet 130 through the water leakage hole.

Thus, when sewage enters the filtering space 110 from the water inlet 120, the sewage can enter the first water distribution pipe 610 and the second water distribution pipe 620, and then enters the water leakage holes through the plurality of water inlet and distribution openings 630 arranged on the first water distribution pipe 610 and the second water distribution pipe 620 at intervals, and then flows to the second filtering layer 410 through the plurality of water leakage holes, in the process, the plurality of water leakage holes play a role of water distribution again, so that the water inlet and distribution are uniform, the local water inlet is prevented, the local soft filtering body 400 is prevented from causing a large processing load, that is, the local soft filtering body 400 is easily prevented from causing too large suspended matter adsorption, so as to facilitate the back flushing of the soft filtering body 400 at the later stage, prolong the service life of the soft filtering body 400, and simultaneously improve the water outlet quality of the filtering tank.

Referring to fig. 1 and 2, it can be understood that the sewage treatment apparatus further includes a backwash water inlet pipe (not shown), a water pump (not shown), and a first valve (not shown), one end of the backwash water inlet pipe is communicated with the backwash water inlet 120, the other end of the backwash water inlet pipe is connected with the water pump, and the first valve is disposed on the backwash water inlet pipe.

Thus, when the first and second filter layers 310 and 410 need to be backwashed, the first valve may be opened, and the water pump may be used to pump the backwash water into the filtering space 110 through the backwash water inlet pipe, so as to provide greater washing power for the backwash water, and thus the filter layers have better washing effect.

Referring to fig. 1, it can be understood that the above-described filtering tank further includes a liquid level meter 900, and the liquid level meter 900 is provided on the second baffle 500 for monitoring the amount of backwash water in the filtering space 110.

Referring to fig. 6, the utility model relates to a sewage treatment device of embodiment includes: a filter tank and a biochemical treatment unit.

Specifically, the biochemical treatment unit comprises a biochemical tank 710, a sedimentation tank 720 and a sedimentation water outlet tank 730, wherein the water outlet 130 of the biochemical tank 710 is communicated with the water inlet 120 of the sedimentation tank 720, the water outlet 130 of the sedimentation tank 720 is communicated with the water inlet 120 of the sedimentation water outlet tank 730, and the water outlet 130 of the sedimentation water outlet tank 730 is communicated with the water inlet 120.

More specifically, the biochemical tank 710 is an MBBR (Moving Bed Biofilm Reactor, fluid Bed Biofilm process) biochemical tank 710. The MBBR biochemical tank 710 is used for continuously flowing sewage through a filler carrier in a reactor (not shown), forming a biofilm on the carrier, and degrading organic pollutants in the sewage while microorganisms propagate and grow on the biofilm in a large quantity, so that the sewage is purified. The MBBR biochemical tank 710 has the characteristics of strong impact load resistance, low sludge yield and long sludge age, can keep more nitrifying bacteria due to long sludge age, and has better denitrification effect.

In the above sewage treatment apparatus, the sewage passes through the biochemical tank 710, the sedimentation tank 720 and the sedimentation outlet tank 730 in sequence for biochemical treatment, so as to remove organic pollutants in the sewage and enable the sludge in the sewage to reach the discharge standard. The sewage flowing out of the biochemical treatment unit can enter a filter tank to remove suspended substances in the sewage. The filter tank in the sewage treatment device can improve the back washing effect of the filter body, so that sewage can have better water outlet quality and water outlet speed after being decontaminated by the sewage treatment device.

Referring to fig. 7, it can be understood that the biochemical tank 710 has a biochemical tank aeration pipe 711, the sewage treatment apparatus further includes an air pump (not shown), a second valve 810 and a third valve 820, the biochemical tank aeration pipe 711 and the back-washing aeration pipe 210 are connected to the air pump, the second valve 810 is disposed at an end of the biochemical tank aeration pipe 711 close to the air pump, and the third valve 820 is disposed at an end of the back-washing aeration pipe 210 close to the air pump.

Specifically, referring to fig. 7, when the filter tank works normally, the second valve 810 is opened, the third valve 820 is closed, and the air pump pumps biochemical aeration gas into the aeration pipe 711 of the biochemical tank to improve the reaction effect in the biochemical tank 710; when the first filter layer 310 and the second filter layer 410 of the filter tank need to be backwashed, the second valve 810 is closed, the third valve 820 is opened, at the moment, the air pump stops pumping air into the aeration pipe 711 of the biochemical tank, the reaction stops in the biochemical tank 710, and the air pump simultaneously pumps backwash air into the backwash aeration pipe 210 so as to improve the backwashing effect on the first filter layer 310 and the second filter layer 410 in the filter space 110, the whole backwashing time is finished within 12 minutes, and the aeration of the biochemical tank 710 is stopped for a short time without influencing the sludge activity in the biochemical tank 710.

More specifically, the first aeration tube 212 is connected to an air pump.

The working principle of the sewage treatment device is as follows: when the filtering tank normally performs filtering operation, sewage can sequentially flow through the biochemical tank 710, the sedimentation tank 720 and the sedimentation water outlet tank 730, so as to remove organic pollutants in the sewage, then enters the water inlet 120 and enters the water inlet distribution pipe 600 through the water inlet 120, the water inlet distribution pipe 600 can make the water inlet and the water distribution uniform, so that local water inlet is prevented, a local soft filter material treatment load is prevented from being excessively large, namely, the quality of adsorbed suspended matters of the local soft filter material is easily prevented from being excessively large, so that the later-stage back washing of the soft filter material is facilitated, the service life of the soft filter material is prolonged, and the quality of outlet water of the filtering tank can be improved. The sewage flowing through the water inlet and distribution pipe 600 can sequentially enter the second filter layer 410 and the first filter layer 310 through the second baffle 500, so as to remove suspended substances in the sewage, and the filtered sewage is discharged through the water outlet 130. At this time, the first and third valves 820 are in a closed state.

The sewage treatment device can set a self-control back-flushing program to ensure that the filtering tank is not seriously polluted and blocked, and the normal cleaning period is once a day. During back flushing, a water inlet valve (not shown) of the filter tank and a water outlet valve (not shown) of the filter tank are both closed, the first valve is opened, back flushing water enters the filter space from the back flushing water inlet 120, and the first valve is closed after the liquid level meter 900 monitors that the liquid level of the inlet water overflows the second baffle 500; meanwhile, the second valve 810 is closed, and the third valve 820 is opened, so that the backwash gas is introduced into the backwash aeration pipe 210, and the first filter layer 310 and the second filter layer 410 can be flushed for 5 to 7 minutes by the combined action of gas and water. At this time, the backwash inlet water is cut into fine flow fast upwelling through the cutting gap between the water distribution head 222 of the first baffle 220 and the first filter layer 310, and the backwash gas in the backwash aeration pipe 210 is also cut into small bubbles fast upwelling with the upwelling water flow through the cutting gap between the backwash aeration holes 211 and the first filter layer 310. The soft filter body 400 floats upwards and rolls violently under the action of the air-water combined upflow, and the soft filter body 400 can be intercepted by the second baffle 500 when floating upwards to the second baffle 500, because of the strong upward thrust of the air-water combined upflow, part of the soft filter body 400 is flushed to two sides after propping against the second baffle 500, the soft filter body 400 rubs mutually and turns up and down, at the moment, the turbulent flow in the filter space 110 is disordered to form a flow state similar to that of a roller washing machine, the disordered air-water turbulent flow and the violent mutual friction among the soft filter body 400 play a good role in stripping the outer layer of the soft filter body 400, no stirring device scrapes are generated in the whole backwashing process, the structure of the outer layer of the soft filter body 400 is not easy to damage, the wire drawing condition cannot occur, and the dosage of backwashing water is greatly saved. After 5 to 7 minutes of backwash, the first valve is opened again so that backwash water can again enter the filtration space 110 for air-water combined backwash with gas, the second backwash lasting 2 to 3 minutes. The second baffle 500 can effectively intercept the soft filter body 400, so that the soft filter body 400 cannot continuously float upwards, the soft filter body 400 cannot run off, the backwashing water outlet 130 cannot be blocked by the soft filter body 400, and most pollutants can be discharged through the backwashing water outlet 130 by backwashing water flow, so that a good backwashing effect is achieved; after the backwashing time is up, the first valve and the third valve 820 are closed, and the water outlet valve (not shown) of the filter tank is opened, so that water which is not discharged from the backwashing water outlet 130 can be discharged through the water outlet 130, and after the backwashing gas in the filtering space 110 is discharged through the backwashing gas outlet 160, the soft filter body 400 can also descend uniformly, thereby ensuring the degree of tiling of the second filtering layer 410 to a certain extent. After the back washing water is completely discharged from the water outlet 130, the second valve 810 and the water inlet valve of the filtering tank are opened, and the biochemical reaction in the biochemical tank 710 and the filtering operation in the filtering tank are resumed. The whole backwashing process is controlled by a self-control program, the duration is not more than 12 minutes, the aeration of the biochemical tank 710 is suspended for a short time, and the sludge activity in the biochemical tank 710 is not influenced.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. A filtration tank, comprising:

the filter tank comprises a filter tank main body, a filter tank main body and a filter tank, wherein the filter tank main body is provided with a filter space, a water inlet, a water outlet, a backwashing water inlet and a backwashing water outlet, the water inlet, the water outlet, the backwashing water inlet and the backwashing water outlet are all communicated with the filter space, the water outlet is arranged below the water inlet, and the backwashing water inlet is arranged below the backwashing water outlet;

the backwashing component comprises a backwashing aeration pipe and a first baffle, the backwashing aeration pipe and the first baffle are arranged in the filtering space, the backwashing aeration pipe and the first baffle are arranged between a backwashing water inlet and a backwashing water outlet, the backwashing aeration pipe is arranged above the first baffle, the first baffle is provided with a plurality of backwashing water distribution ports, the plurality of backwashing water distribution ports are communicated with the backwashing water inlet, and the backwashing aeration pipe is provided with a plurality of backwashing aeration holes;

the first filter layer is arranged above the first baffle, the top of the first filter layer is higher than the top of the backwashing aeration pipe, the first filter layer comprises a plurality of hard filter bodies, and a plurality of cutting gaps are formed among the hard filter bodies; and

the second filtering layer is arranged above the first filtering layer, the water inlet and the backwashing water outlet are higher than the top of the second filtering layer, and the second filtering layer comprises a plurality of soft filtering bodies.

2. The filtration tank of claim 1, further comprising a plurality of water distribution heads, wherein the plurality of water distribution heads are disposed on the plurality of backwash water distribution ports in a one-to-one correspondence.

3. The filtration tank of claim 1, wherein the first baffle is further disposed between the water inlet and the water outlet.

4. The filter tank of claim 1, wherein the backwash aeration pipe comprises a first aeration pipe and a plurality of second aeration pipes, the first aeration pipe is enclosed along the inner side wall of the filter tank body into an end-to-end annular structure, the plurality of second aeration pipes are arranged at intervals in the annular structure, and two ends of each second aeration pipe are communicated with the first aeration pipe;

the first aeration pipe and the second aeration pipe are respectively provided with a plurality of back washing aeration holes at intervals.

5. The filtration tank of claim 1, wherein a second baffle is further disposed within the filtration space, the second baffle being disposed below the water inlet and the backwash water outlet, and the second baffle being disposed above the first baffle, the first and second filtration layers being disposed between the first and second baffles.

6. The filtering tank of claim 5, wherein a plurality of inlet water distribution pipes are further disposed in the filtering space, the inlet water distribution pipes are disposed above the second baffle, each inlet water distribution pipe comprises a first water distribution pipe and a second water distribution pipe, one end of each first water distribution pipe is communicated with the water inlet, the other end of each first water distribution pipe extends towards the inside of the filtering tank main body, the plurality of second water distribution pipes are spaced apart from each other and arranged on the first water distribution pipe, and each second water distribution pipe is communicated with the first water distribution pipe;

and a plurality of water inlet and distribution ports are arranged on the first water distribution pipe and the second water distribution pipe at intervals.

7. The filtration tank as claimed in claim 6, wherein a plurality of water leakage holes are arranged on the second baffle at intervals, and each water inlet and distribution port is communicated with each water leakage hole.

8. The filter tank of claim 1, further comprising a backwash water inlet pipe, a water pump and a first valve, wherein one end of the backwash water inlet pipe is communicated with the backwash water inlet, the other end of the backwash water inlet pipe is connected with the water pump, and the first valve is arranged on the backwash water inlet pipe.

9. A sewage treatment apparatus, comprising:

a filtration tank as claimed in any one of claims 1 to 8;

the biochemical treatment unit comprises a biochemical tank, a sedimentation tank and a sedimentation water outlet tank, wherein a water outlet of the biochemical tank is communicated with a water inlet of the sedimentation tank, a water outlet of the sedimentation tank is communicated with a water inlet of the sedimentation water outlet tank, and a water outlet of the sedimentation water outlet tank is communicated with the water inlet.

10. The wastewater treatment apparatus according to claim 9, wherein the biochemical tank has a biochemical tank aeration pipe, the wastewater treatment apparatus further comprises an air pump, a second valve and a third valve, the biochemical tank aeration pipe and the back-washing aeration pipe are connected to the air pump, the second valve is disposed at an end of the biochemical tank aeration pipe close to the air pump, and the third valve is disposed at an end of the back-washing aeration pipe close to the air pump.

Images