WO2023102958A1

WO2023102958A1 - Dissolved air flotation and filtration integrated device

Info

Publication number: WO2023102958A1
Application number: PCT/CN2021/137648
Authority: WO
Inventors: 李桂平; 方杰
Original assignee: 山东亚信环保技术有限公司
Priority date: 2021-12-08
Filing date: 2021-12-14
Publication date: 2023-06-15
Also published as: CN215975343U

Abstract

A dissolved air flotation and filtration integrated device, comprising: at least one quick mixing tank (2), at least a pair of water distribution tanks (4), at least a pair of flocculation tanks (8), at least a pair of flotation and filtration tanks (13), and at least one scum tank (26). The integrated device simultaneously implements dissolved air flotation and filtration processes; and when the water treatment effect is ensured, the dissolved air release effect is improved, the backwashing period is prolonged, the maintenance difficulty is reduced, the operation and maintenance costs of equipment are reduced, and the operation stability of the equipment is improved.

Description

An integrated device for air flotation filter

technical field

The utility model belongs to the field of water treatment equipment, in particular to an integrated device for an air flotation filter.

Background technique

Traditional water treatment processes include air flotation and filtration processes. Sewage contains a large amount of oil, including slick oil, dispersed oil, emulsified oil, and dissolved oil. The air flotation process is to dissolve air into water under a certain pressure in advance to form a supersaturated air-water mixture, and then pass through the release device to reduce the oil. After the pressure is released, the air originally dissolved in the water forms a large number of microbubbles. These microbubbles combine with the fine oil and suspended solid particles in the sewage after coagulation and flocculation. After the combination, the overall density decreases, and the particles slowly float up to Scum is formed on the surface of the water, and finally it is scraped away and discharged by the scraping system to realize oil-water separation, which greatly reduces the oil content and suspended solids concentration in the treated water, and has a good removal effect on slick oil, dispersed oil and emulsified oil; filtration The process is to use fine particle filter material to accumulate into a filter layer of a certain height. Because there are small gaps between the fine particles, the water can be discharged through the filter layer, and the particles in the water are trapped in the filter layer because it is difficult to pass through the small gaps. At the same time The retained fine particles also have a certain auxiliary effect on filtration. As the filtration progresses, the gaps in the originally clean filter layer are gradually filled with fine particles in the water. After a certain period, the water resistance of the filter layer increases, and the filtration and purification effect is gradually lost. At this time, water backwashing and air backwashing are required. , backwash the fine particles intercepted by the filter layer, and discharge them separately from the filter layer, so that the filter layer can restore the filtering interception function.

There are two ways to realize air flotation and filtration process in water treatment. The first is to install the air flotation and filtration separately. Usually, the air flotation device is first and the filter device is second. The treatment effect can meet the water treatment requirements, but it occupies a large area, the basic structure is large, and the construction cost is high. Water treatment It needs multiple water distributions and has high requirements for elevation and energy consumption; the second type is to combine the air flotation flotation tank vertically on the filter tank to form an air flotation filter. The upper part of the filter tank is selected to remove oil and suspended solids, and the water in the lower part of the flotation filter tank passes through the filter plate directly below to filter out residual fine particles. The final filtered effluent has less suspended solids, low turbidity and good water quality.

technical problem

In the prior art, the combined air flotation filter has the following problems in design and operation:

1) When distributing water after the quick mixing tank, the overflow distribution pipe is installed inside the flocculation tank, the control valve on the overflow distribution pipe is located underwater, the valve needs to be customized, and it has been immersed in water for a long time, causing serious corrosion and failure High rate and difficult to overhaul;

2) The flocculation tank adopts the method of upper water inlet and upper water outlet, and hydraulic short flow often occurs, and the flocculation effect becomes poor, which in turn affects the treatment effect of the air flotation filter;

3) The dissolved air releaser generally adopts a fixed opening form, and the releaser is often blocked by particles entrained in the reflux water, but the releaser is located underwater and cannot be repaired in time, resulting in low efficiency of dissolved air release and poor air flotation effect Up to standard;

4) The bottom filter plate of the flotation filter tank is poured on site, it is difficult to control the flatness of the filter plate in the filtration area, which in turn affects the uniform distribution of water flow in the filtration area, and prone to channel flow and uneven distribution of filter material interception, resulting in water quality Penetration is accelerated, effluent water quality deteriorates rapidly, and the backwash cycle is short. the

technical solution

In view of the above-mentioned problems in the prior art, the utility model provides an integrated device for air flotation and filter pools, which combines the air flotation pool and the filter pool to realize the air flotation and filtration processes at the same time. On the premise of ensuring the water treatment effect, Improve the release effect of dissolved air, prolong the backwash cycle, reduce the difficulty of maintenance, reduce the operation and maintenance cost of equipment, and improve the operation stability of equipment.

In order to achieve the above object, the utility model adopts the following technical solutions:

An air flotation filter integration device, the device includes: at least one quick mixing tank 2, at least one pair of water distribution tanks 4, at least one pair of flocculation tanks 8, at least one pair of flotation filter tanks 13 and at least one scum tank 26; where,

The bottom of the first side of the fast mixing tank 2 is provided with a water inlet pipe 1, and two water distribution tanks 4 are symmetrically arranged on the second side and the third side adjacent to the first side, and the fourth side facing the first side Outside, adjacent to the water distribution tank 4, there are at least two co-edge flocculation tanks 8 arranged symmetrically; the second side and the upper part of the third side of the fast mixing tank 2 are provided with openings communicating with the water distribution tank 4; The bottom surface of the pool 2 is not lower than the bottom surface of the distribution pool 4; a quick mixing agitator 3 is arranged inside the fast mixing pool;

The inside of the water distribution tank 4 is provided with a water distribution overflow pipe 5 corresponding to the opening of the fast mixing tank 2; the bottom surface of the water distribution tank 4 is higher than the bottom surface of the flocculation tank 5; the bottom of the water distribution tank 4 is provided with a connecting pipe 6. The communication pipe 6 is connected downward to the bottom of the first side of the flocculation tank 8; the communication pipe 6 is provided with a self-control valve 7;

The first side of the flocculation tank 8 is adjacent to the distribution tank 4 and the bottom surface is lower than the bottom surface of the distribution tank; the fourth side of the flocculation tank 8 facing the first side is symmetrically provided with a co-edge flotation filter tank 13, The bottom of the fourth side has an opening communicating with the flotation filter tank 13, and a flow stabilization cylinder 10 corresponding to the opening is provided in the flocculation tank 8; the bottom of the flow stabilization cylinder 10 faces the opening and is closed at 45°, and the flow stabilization The top of the cylinder 10 is open, and the surface where the opening is located is lower than the working liquid level of the flocculation tank 8; the flocculation tank 8 is provided with a flocculation agitator 9;

The first side of the flotation filter tank 13 is adjacent to the fourth side of the flocculation tank 8, the first side is provided with a fifth side shorter than the first side, and the second side and the third side are respectively perpendicular to the first side Adjacent; the bottom of the fifth side is perpendicular to the bottom surface of the flotation filter tank 13, and the two ends are vertically connected with the second side and the third side, so that the flotation filter tank 13 is divided into a front area and a rear area, and the front area and the third side are vertically connected. The rear area communicates with the upper side of the fifth side; a scum tank 25 is arranged on the outer edge of the upper end of the fourth side facing the first side, and a scum pool 26 is arranged adjacent to the outside of the second side or the third side; The groove 25 communicates with the scum tank 26;

The bottom of the front area of the flotation filter tank 13 is provided with a dissolved air release device 11; the dissolved air release device 11 is adjustable and equipped with an extension rod, and the opening of the underwater release device can be monitored in real time through the extension rod at the top of the device. Adjustment; the dissolved air release device 11 is connected with a pressurized air-dissolving device 12;

The rear area of the flotation filter tank 13 is provided with a backwash cloth air pipe 19, a water distribution filter beam 16, a filter filter plate 15, a filter material 24 and a backwash drainage tank 18 from bottom to top; A water hole is reserved on the top, and the backwash cloth air pipe 19 is set in the water hole of the water distribution filter beam 16; the filter plate 15 is fixed on the upper surface of the water distribution filter beam 16; the backwash drainage tank 18 is set Below the water surface of the flotation filter tank and above the filter material 24; the top of the flotation filter tank corresponding to the rear area is provided with a shearing water spray pipe 14 and a fixed roller slag scraper 17, and the fixed roller slag scraper 17 is set above the scum tank 25;

The bottom of the fourth side of the flotation filter tank 13 is provided with an outlet pipe 20 extending out of the pool body and a backwash inlet pipe 22. The outlet pipe 20 is provided with an outlet control valve 21, and the backwash inlet pipe 22 is provided with a backwash inlet pipe. Water control valve 23;

The scum tank 26 is funnel-shaped, and a scum discharge pipe 27 is arranged at the bottom of the funnel.

In the above scheme, the overflow water distribution pipe 5 is composed of a straight pipe, a 90° elbow, a bell mouth, and an adjustment ring. One end is connected with the straight pipe, the other end is vertically upward, and connected with the small mouth of the bell mouth, the bell mouth is placed vertically, the small mouth is on the bottom, the big mouth is on the top, and the edge of the big mouth is kept horizontal. The ring sleeve can adjust the height of the outlet weir.

In the above scheme, the fast mixing agitator 3 is arranged in the center of the fast mixing tank 2, and adopts a paddle-folding or propulsion type; .

In the above scheme, the two ends of the shearing water spray pipe 14 straddle the upper pool wall of the first side and the fourth side of the flotation filter tank 13, and one and the second side are respectively arranged adjacent to the second side and the third side. The water spray pipes parallel to the side and the fourth side are equipped with a nozzle every 500~1000mm on the water spray pipe.

In the above solution, the backwash drainage tank 18 is composed of two semicircular or rectangular tanks, one end of the backwash drainage tank 18 is closed, and the other end extends outside the device; the part extending outside the device is provided with a drain.

In the above scheme, the filter plate 15 is square, with a side length of 500-1000mm and a thickness of 80-120mm; The number of heads is 36~64.

In the above solution, the filter plate 15 adopts a prefabricated filter plate splicing mode.

In the above scheme, the filter material 25 is evenly laid in upper and lower layers directly above the filter plate, the lower layer is laid with quartz sand, and the upper layer is laid with anthracite or activated carbon filter material.

In the above solution, the water distribution filter beams 16 are vertically and evenly arranged with outlet pipes of 25-40mm, and the distance between the outlet pipes is 800-1500mm.

In the above solution, the water outlet pipe 20 and the backwash water inlet pipe 22 share a main pipe.

In the above scheme, the main bodies of the fast mixing tank 2, the water distribution tank 4, the flocculation tank 8, the flotation filter tank 13 and the scum tank 26 of the device are concrete and/or steel structures.

Beneficial effect

The utility model has the following beneficial effects:

The air flotation filter integration device provided by the embodiment of the utility model includes at least one fast mixing tank, at least one pair of water distribution tanks, at least one pair of flocculation tanks, at least one pair of flotation filter tanks and at least one scum tank. The bottom of the side of the mixing tank is provided with a water inlet port, and the top of the fast mixing tank is symmetrically provided with overflow water distribution pipes on both sides. The connecting pipe is connected with a control valve. The flocculation tank is fed from the bottom and discharged from the upper part, and flows into the flotation filter tank by itself. The sewage to be treated is flotation in the upper part of the flotation filter tank. After flowing into the scum tank, the water after flotation completes flotation filtration through the lower part of the flotation filter tank, and is discharged from the water outlet. After the device has been in operation for a period of time, it needs to be backwashed to restore the filtration capacity of the filter layer. After entering the backwash At the same time, the backwashing cloth air pipe is fed with air first, and after the air scrubbing is completed, the backwashing water inlet pipe is fed with backwashing water, and the backwashing water is finally discharged from the backwashing drainage tank. In the embodiment of the utility model, air flotation and filtration are combined in the same structure to form an air flotation filter tank, which saves floor area; the outlet water of the fast mixing tank is equipped with symmetrical overflow weir grooves, which can realize the subsequent parallel two rows of flocculation tanks Uniform water distribution; after uniform water distribution, the outlet water is transported to the lower part of the flocculation tank through the external pipeline, and the switch valve is arranged on the pipeline to realize the control of the water inlet of the single row flocculation tank. The external valve eliminates the high failure rate of the underwater valve used in the previous similar process , the problem of difficult maintenance; the flocculation tank adopts the water inlet from the lower part and the water outlet from the upper part, which solves the problem of short hydraulic flow in the previous similar processes; The real-time adjustment of the underwater releaser on the water surface can solve the problem that the traditional fixed dissolved air releaser is easy to block and cannot be repaired online; the filter system at the bottom of the filter adopts the splicing mode of prefabricated filter plates, which is convenient for actual installation and adjustment, so as to achieve more Good installation flatness solves the problem that it is difficult to control the flatness of the pouring filter plate on site; the air flotation filter has its own scum tank, and the scum tank discharges the scum after concentration, which significantly reduces the amount of sludge discharged. the

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

Fig. 1 is a kind of structural top view of the air flotation filter integrated device provided by the utility model embodiment;

Fig. 2 is a top structural plan view of the air flotation filter integrated device provided by the embodiment of the present invention;

Fig. 3 is a top view of the bottom structure of the air flotation filter integrated device provided by the embodiment of the present invention;

Fig. 4 is the A-A sectional view of the air flotation filter integrated device shown in Fig. 1-3 of the utility model embodiment;

Fig. 5 is the B-B sectional view of the integrated device of the air flotation filter shown in Fig. 1-3 of the utility model embodiment;

Fig. 6 is a schematic diagram of the structure of the scum tank in section C-C of the air flotation filter integration device shown in Fig. 1-3 of the embodiment of the utility model.

Explanation of reference signs:

1-Water inlet pipe, 2-Quick mixing tank, 3-Quick mixing tank agitator, 4-Water distribution tank, 5-Overflow distribution pipe, 6-Connecting pipe, 7-Automatic control valve, 8-Flocculation tank, 9-Flocculation tank Stirrer, 10-stabilizing cylinder, 11-dissolved air releaser, 12-pressurized dissolved air device, 13-flotation filter tank, 14-shear spray pipe, 15-filter filter plate, 16-water distribution filter beam , 17-Fixed roller slag scraper, 18-Backwash drainage tank, 19-Backwash cloth air pipe, 20-Water outlet pipe, 21-Water outlet control valve, 22-Backwash water inlet control valve, 23-Backwash water inlet pipe , 24-filter material, 25-scum tank, 26-scum pool, 27-scum discharge pipe.

Embodiments of the present invention

In the following, the technical problems, technical solutions and advantages of the present invention will be explained in detail by referring to exemplary embodiments and in conjunction with the accompanying drawings. The exemplary embodiments described below are only used to explain the present utility model, but not to limit the present utility model. Those skilled in the art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have meanings consistent with their meaning in the context of the prior art and will not be used in an idealized or overly formal sense unless defined herein to explain.

Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present utility model refers to the presence of the stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features , integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to Fig. 1 to Fig. 5, the embodiment of the utility model provides an integrated device for air flotation filter, which includes: at least one fast mixing tank 2, at least one pair of water distribution tanks 4, at least one pair of flocculation tanks 8, At least one pair of flotation filter tanks 13 and at least one scum tank 26 .

The bottom of the first side of the fast mixing tank 2 is provided with a water inlet pipe 1, and the second side adjacent to the first side and the third side are symmetrically provided with a water distribution tank 4, and the fourth side facing the first side, A flocculation tank 8 is arranged symmetrically next to the water distribution tank 4; the second side and the upper part of the third side of the fast mixing tank 2 are provided with openings communicating with the water distribution tank 4; the bottom surface of the fast mixing tank 2 is not It is lower than the bottom surface of the distribution tank 4; the quick mixing tank 2 is provided with a quick mixing agitator 3 inside.

The inside of the water distribution tank 4 is provided with a water distribution overflow pipe 5 corresponding to the opening of the fast mixing tank 2; the bottom surface of the water distribution tank 4 is higher than the bottom surface of the flocculation tank 8; the bottom of the water distribution tank 4 is provided with a connecting pipe 6. The communication pipe is connected downward to the bottom of the first side of the flocculation tank 8; the communication pipe 6 is provided with a self-control valve 7 . The two symmetrical water distribution tanks 4 are separately connected to the corresponding flocculation tank 8 through the connecting pipe 6 and the automatic control valve 7 to realize the control of the single-column flocculation water inflow. The automatic control valve 7 is dry-installed.

The first side of the flocculation tank 8 is adjacent to the distribution tank 4 and the bottom is lower than the bottom of the distribution tank 4; the fourth side facing the first side of the flocculation tank 8 is symmetrically arranged with a co-edge flotation filter tank 13 , the bottom of the fourth side has an opening communicating with the flotation filter tank 13, and the flocculation tank 8 is provided with a steady flow cylinder 10 with a semicircular cross-section corresponding to the opening; the bottom of the steady flow cylinder 10 is facing the opening and is Closed at 45°, the top of the steady flow cylinder 10 is open, and the surface where the opening is located is lower than the working liquid level of the flocculation tank 8, so that the water is discharged from the flocculation tank and the water is inflow from the flotation filter tank; the flocculation tank 8 is equipped with flocculation stirring Device 9.

The first side of the flotation filter tank 13 is adjacent to the fourth side of the flocculation tank 8, the first side is provided with a fifth side shorter than the first side, and the second side and the third side are vertically adjacent to the first side respectively , the bottom of the fifth side is perpendicular to the bottom surface of the flotation filter tank, and the two ends are vertically connected with the second side and the third side, so that the flotation filter tank is divided into a front area and a rear area, and the front area and the rear area are in the fifth The upper side of the side is connected; a scum tank 25 is arranged on the outer edge of the upper end of the fourth side facing the first side, and a scum pool 26 is arranged next to the second side or the third side; the scum tank 25 is connected to the scum tank The slag pool 26 is connected.

The bottom of the front area of the flotation filter tank 13 is provided with a dissolved air releaser 11; the dissolved air releaser 11 is adjustable and equipped with an extension rod, which can be released on the water surface through the extension rod on the top of the device. Real-time adjustment solves the problem that the traditional fixed dissolved air releaser is easy to block and cannot be repaired online. The dissolved air releaser 11 is connected with a pressurized air-dissolved device 12 to provide the dissolved air releaser 11 with pressurized dissolved air water. The pressurized air dissolving device 12 includes a pressurizing pump, an air dissolving tank and a compressed air supply device.

The rear area of the flotation filter tank 13 is provided with a backwash cloth air pipe 19, a water distribution filter beam 16, a filter filter plate 15, a filter material 24 and a backwash drainage tank 18 from bottom to top; A water passage hole is reserved on the top, and the backwash cloth air pipe 19 is arranged in the water passage hole of the water distribution filter beam 16; the filter filter plate 15 is fixed on the upper surface of the water distribution filter beam 16, and the prefabricated filter plate splicing mode is adopted to facilitate The actual installation adjustment is to achieve better installation flatness and solve the problem that it is difficult to control the flatness of the cast-in-place filter plate; Above: the top of the flotation filter tank corresponding to the rear area is provided with a shearing water spray pipe 14 and a fixed roller scum scraper 17, and the fixed roller scum scraper 17 is arranged above the scum tank.

The bottom of the fourth side of the flotation filter tank 13 is provided with an outlet pipe 20 extending out of the pool body and a backwash inlet pipe 22. The outlet pipe 20 is provided with an outlet control valve 21, and the backwash inlet pipe 22 is provided with a backwash inlet pipe. Control valve 23.

In a preferred embodiment of the present utility model, the overflow distribution pipe 5 is composed of a straight pipe, a 90° elbow, a bell mouth, and an adjustment ring, and the straight pipe is connected to the opening where the quick mixing tank communicates with the water distribution tank , one end of the 90° elbow is connected to the straight pipe, the other end is vertically upward, and connected to the small mouth of the bell mouth, the bell mouth is placed vertically, the small mouth is on the bottom, the big mouth is on the top, and the edge of the big mouth is kept horizontal. The upper part of the large mouth is equipped with an adjusting ring, which can adjust the height of the outlet weir.

In a preferred embodiment of the present utility model, the fast mixing agitator 3 is arranged in the center of the fast mixing tank 2, and adopts a paddle type or a propulsion type; the flocculation agitator 9 is arranged in the center of the flocculation tank 8, Adopt folding paddle type or propulsion type.

In a preferred embodiment of the present utility model, the two ends of the shear spray pipe 14 straddle the upper pool wall of the first side and the fourth side of the flotation filter tank 13, and are adjacent to the second side and the third side. Each is provided with a water spray pipe parallel to the second side and the fourth side, and the water spray pipe is equipped with a nozzle every 500~1000mm.

In a preferred embodiment of the present utility model, the fixed roller slag scraper 17 and the shearing water spray pipe 14 operate intermittently, and are manually or automatically controlled according to the amount of scum on the surface of the flotation filter tank 13 The operation of the fixed roller slag scraper 17 and the shearing spray pipe 14. When the fixed roller scum scraper 17 is in operation, the scum on the surface of the flotation filter tank 13 is scraped into the scum tank 25 . The scum is scraped to the scum tank 25 by the rotation of the fixed roller scum scraper 17 installed at the end of the air flotation filter tank 13, and flows into the scum tank 26 by itself.

In a preferred embodiment of the present utility model, two slopes are arranged in the scum tank 26, and the bottom of the slope is the bottom of the funnel, and the scum slowly sinks to the bottom of the slope along the slope, and the scum discharge pipe 27 is arranged at the bottom of the slope , the scum is finally discharged from the scum discharge pipe 27.

In a preferred embodiment of the present utility model, the backwash drainage groove 18 is composed of two semicircular or rectangular grooves, one end of the backwash drainage groove 18 is closed, and the other end extends out of the pool body; The part outside the body is provided with a drainage port.

In a preferred embodiment of the present utility model, the filter plate 15 is a square, with a side length of 500-1000mm and a thickness of 80-120mm; There are 36 to 64 long-handled filter heads of each filter plate; several square filter plates 15 are spliced to cover the bottom of the flotation filter tank 13 .

In a preferred embodiment of the present invention, the filter material 24 is evenly laid in two layers above the filter plate 15, the lower layer is laid with quartz sand, and the upper layer is laid with anthracite or activated carbon filter material.

In a preferred embodiment of the present utility model, the water distribution filter beam 16 is arranged at the bottom of the flotation filter tank 13, and the air outlet pipes of 25-40 mm are evenly arranged vertically upward, and the distance between the air outlet pipes is 800-1500 mm.

In a preferred embodiment of the present utility model, the water outlet pipe 20 and the backwash water inlet pipe 23 share a main pipe.

In a preferred embodiment of the present utility model, the main bodies of the quick mixing tank 2, the water distribution tank 4, the flocculation tank 8, the flotation filter tank 13 and the scum tank 26 of the device are concrete and/or steel structures.

When the water treatment is carried out by the air flotation filter integration device described in this embodiment, it includes the start-up operation stage and the stop backwashing stage.

During the start-up phase:

The water to be treated enters the fast mixing tank 2 through the water inlet pipe 1, and after entering the water, the agitator 3 of the fast mixing tank is turned on for stirring and mixing;

The outlet water of the quick mixing tank 2 is evenly distributed through the overflow water distribution pipe 5 and flows to the water distribution tank 4 by itself, and the outlet water of the water distribution tank 4 enters the flocculation tank 8 through the connecting pipe 6;

After the flocculation tank 8 is filled with water, the agitator 9 of the flocculation tank is turned on for stirring, and after the liquid level of the flocculation tank reaches the top semicircular opening of the steady flow cylinder 10, the water flows into the flotation filter tank by itself. 13 at the bottom of the front end;

After the liquid level of the flotation filter 13 reaches the working liquid level, the dissolved air releaser 11 is opened, and the pressurized dissolved air water enters the flotation filter 13 after being released by the dissolved air releaser 11, and releases The microbubbles that come out combine with the oils and suspended matter in the water, and slowly float up to the water surface, and the scum formed by these oils and suspended matter is removed by the fixed roller slag scraper 17 and the shearing water spray pipe 14. Scraped to the scum tank 25, finally self-flowed to the scum pool 26, and discharged from the device through the scum discharge pipe 27;

The purified water flows vertically downwards through the filter material 24, the remaining fine particles in the water are intercepted and intercepted by the filter material 24, and the clean water passes through the long-handle filter head uniformly distributed on the surface of the filter plate 15, the The water hole at the bottom of the water distribution filter beam 16 is finally discharged by the outlet pipe 20.

During shutdown backwashing phase:

When the filter material 24 intercepts the fine particles in the intercepted water and reaches saturation or the discharge water quality of the outlet pipe exceeds the required index, the automatic control valve 7 at the entrance of the flocculation tank 8 needs to be closed to cut off the corresponding water intake;

When the flotation filter 13 cuts off the water intake, the water level will gradually drop, and when the water level of the flotation filter 13 is 300-500 mm from the surface of the filter material 24, close the water outlet control valve twenty one;

The backwash cloth air pipe 19 is connected to air, and the filter material 24 is reversely scrubbed through the air from bottom to top, so that the filter material 24 is loosened, and the retained fine particles are washed out; this process continues 3 ~ 5min, after the end, stop the air in the backwashing cloth air pipe 19;

After the air scrubbing is finished, perform water backwashing; open the backwashing water inlet control valve 22, the backwashing water inlet pipe 23 is connected to clean water, and after the clean water enters the flotation filter tank 13, it passes through the water distribution filter in turn. The water hole at the bottom of the beam (16) and the long-handle filter head evenly distributed on the surface of the filter plate 15 pass through the filter material 24 upwards, and finally discharge the device from the backwash drainage tank 18. This process The fine particles washed out by air scrubbing are taken out together to restore the filtering capacity of the filter material 24; this process lasts for 5-8 minutes, and then enters the start-up operation stage again after the end.

It can be seen from the above technical solutions that in the air flotation filter integrated device provided by the embodiment of the utility model, the water inlet port is provided on the side and bottom of the fast mixing tank, and the overflow water distribution pipe is symmetrically arranged on both sides of the top of the fast mixing tank, so that The water in the mixing tank flows automatically to the distribution tanks on both sides through the overflow distribution pipe. The bottom of the distribution tank is connected to the bottom of the flocculation tank by a connecting pipe, and a control valve is installed on the connecting pipe. In the filter tank, the sewage to be treated is flotation in the upper part of the flotation filter tank, and the scum is scraped into the scum tank and flows into the scum tank. After the device has been running for a period of time, backwashing is required to restore the filtration capacity of the filter layer. When entering backwashing, the air pipe of the backwashing cloth is first fed into the air, and after the air scrubbing is completed, the backwashing water inlet pipe is passed into the backwashing With water, the backwash water is eventually drained from the backwash gutter. In the embodiment of the utility model, air flotation and filtration are combined in the same structure to form an air flotation filter tank, which saves floor area; the outlet water of the fast mixing tank is equipped with symmetrical overflow weir grooves, which can realize the subsequent parallel two rows of flocculation tanks Uniform water distribution; after uniform water distribution, the outlet water is transported to the lower part of the flocculation tank through the external pipeline, and the switch valve is arranged on the pipeline to realize the control of the water inlet of the single row flocculation tank. The external valve eliminates the high failure rate of the underwater valve used in the previous similar process , the problem of difficult maintenance; the flocculation tank adopts the water inlet from the lower part and the water outlet from the upper part, which solves the problem of short hydraulic flow in the previous similar processes; The real-time adjustment of the underwater releaser on the water surface can solve the problem that the traditional fixed dissolved air releaser is easy to block and cannot be repaired online; the filter system at the bottom of the filter adopts the splicing mode of prefabricated filter plates, which is convenient for actual installation and adjustment, so as to achieve more Good installation flatness solves the problem that it is difficult to control the flatness of the pouring filter plate on site; the air flotation filter has its own scum tank, and the scum tank discharges the scum after concentration, which significantly reduces the amount of sludge discharged.

Those of ordinary skill in the art can understand that: the components in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, and can also be changed and located in one or more devices different from the embodiment. The components in the above embodiments can be combined into one component, and can also be further divided into multiple subcomponents.

The above is a preferred embodiment of the present utility model, it should be pointed out that the present utility model is not limited to the exemplary embodiments disclosed above, and the essence of the description is only to help those skilled in the art to comprehensively understand the specific details of the present utility model . For those of ordinary skill in the art, on the premise of not departing from the principles described in the utility model, any improvements and modifications made within the technical scope disclosed in the utility model, and easily conceivable changes or replacements should be Covered within the protection scope of the present utility model.

Claims

An air flotation filter integration device, characterized in that the device includes: at least one quick mixing tank, at least one pair of water distribution tanks, at least one pair of flocculation tanks, at least one pair of flotation filter tanks and at least one scum tank ;in,

The bottom of the first side of the fast mixing tank is provided with a water inlet pipe, and two water distribution tanks are arranged symmetrically on the second side and the third side adjacent to the first side, and on the outside of the fourth side facing the first side, and The water distribution tank is symmetrically arranged with at least two co-edge flocculation tanks; the second side and the upper part of the third side of the fast mixing tank are provided with openings communicating with the water distribution tank; the bottom surface of the fast mixing tank is not lower than the The bottom surface of the distribution tank; the fast mixing tank is provided with a quick mixing agitator;

The inside of the water distribution tank is provided with a water distribution overflow pipe corresponding to the opening of the fast mixing tank; the bottom surface of the water distribution tank is higher than the bottom surface of the flocculation tank; the bottom of the water distribution tank is provided with a connecting pipe, and the connecting pipe communicates downward At the bottom of the first side of the flocculation tank; the connecting pipe is provided with a self-control valve;

The first side of the flocculation tank is adjacent to the distribution tank and the bottom surface is lower than the bottom surface of the distribution tank; the fourth side of the flocculation tank facing the first side is symmetrically arranged with a co-edge flotation filter tank, and the fourth The bottom of the side has an opening communicating with the flotation filter tank, and a steady flow cylinder corresponding to the opening is arranged in the flocculation tank; the bottom of the steady flow cylinder is facing the opening and is closed at 45°, and the top of the steady flow cylinder is open, and the open The surface where it is located is lower than the working liquid level of the flocculation tank; a flocculation agitator is arranged in the flocculation tank;

The first side of the flotation filter tank is adjacent to the fourth side of the flocculation tank, the first side is provided with a fifth side shorter than the first side, and the second side and the third side are respectively vertically adjacent to the first side ; The bottom of the fifth side is perpendicular to the bottom surface of the flotation filter tank, and the two ends are vertically connected with the second side and the third side, and the flotation filter tank is divided into a front area and a rear area, and the front area and the rear area are in the fifth The upper side of the side is connected; a scum tank is provided on the outer edge of the upper end of the fourth side facing the first side, and a scum tank is provided adjacent to the outside of the second side or the third side; the scum tank is connected to the scum tank connected;

The bottom of the front area of the flotation filter tank is provided with a dissolved air releaser; the dissolved air releaser is adjustable and equipped with an extension rod; the dissolved air releaser is connected with a pressurized air-dissolving device;

The rear area of the flotation filter tank is provided with water distribution filter beams, backwash cloth air pipes, filter filter plates, filter materials and backwash drainage tanks in sequence from bottom to top; water holes are reserved on the water distribution filter beams, The backwash cloth air pipe is set in the water passage hole of the water distribution filter beam; the filter plate is fixed on the upper surface of the water distribution filter beam; the backwash drainage tank is set below the water surface of the flotation filter tank and between the filter material Above; the top of the flotation filter tank corresponding to the rear area is equipped with a shearing water spray pipe and a roller scum scraper, and the roller scum scraper is set above the scum tank;

The bottom of the fourth side of the flotation filter tank is provided with an outlet pipe protruding from the pool body and a backwash inlet pipe, the outlet pipe is provided with an outlet control valve, and the backwash inlet pipe is provided with a backwash inlet control valve;

The scum pool is funnel-shaped, and a scum discharge pipe is arranged at the bottom of the funnel.
According to the integrated device of air flotation filter according to claim 1, it is characterized in that the overflow distribution pipe is composed of a straight pipe, a 90° elbow, a bell mouth, and an adjustment ring, and the straight pipe is connected to the fast mixing tank. At the opening connected to the water distribution pool, one end of the 90° elbow is connected to the straight pipe, and the other end is vertically upward and connected to the small mouth of the bell mouth. The bell mouth is placed vertically, with the small mouth on the bottom and the big mouth on the top. The mouth is kept horizontal, and the upper part of the bell mouth is equipped with an adjusting ring.
The air flotation filter integration device according to claim 1, characterized in that, the fast mixing agitator is arranged in the center of the fast mixing tank, and adopts a folding paddle type or a propulsion type; the flocculation agitator is arranged in the flocculation The center of the pool adopts the folding paddle type or propulsion type.
The air flotation filter integration device according to claim 1, characterized in that, the two ends of the shearing water spray pipe straddle the upper pool wall of the first side and the fourth side of the flotation filter tank, and are adjacent to the first side The second side and the third side are each provided with a water spray pipe parallel to the second side and the fourth side, and the water spray pipe is equipped with a nozzle every 500~1000mm.
The air flotation filter integrated device according to claim 1, characterized in that the backwash drainage tank is composed of two semicircular or rectangular tanks, one end of the backwash drainage tank is closed, and the other end extends out of the device External; the part protruding from the outside of the device is provided with a drain.
The air flotation filter integrated device according to claim 1, wherein the filter plate is a square, with a side length of 500-1000 mm and a thickness of 80-120 mm; the surface of the filter plate is evenly distributed Long-handle filter head, the number of long-handle filter head for each filter plate is 36~64.
The air flotation filter integration device according to claim 6, wherein the filter plate adopts a splicing mode of prefabricated filter plates.
The air flotation filter integrated device according to claim 1, characterized in that the filter material is divided into upper and lower layers and evenly laid directly above the filter plate, the lower layer is laid with quartz sand, and the upper layer is laid with anthracite or activated carbon filter. material.
The air flotation filter integrated device according to claim 1, characterized in that, the outlet pipes of 25-40 mm are evenly arranged vertically upwards on the water distribution filter beam, and the distance between the air outlet pipes is 800-1500 mm.
The air flotation filter integration device according to claim 1, characterized in that, the water outlet pipe and the backwash water inlet pipe share a main pipe.
The air flotation filter integration device according to claim 1, characterized in that the main bodies of the device's quick mixing tank, water distribution tank, flocculation tank, flotation filter tank and scum tank are concrete and/or steel structures .