CN101830533A - V-shaped air floating filter with deslagging function - Google Patents

Abstract

A V-shaped air flotation filter with slag discharge function relates to a water quality treatment structure of a water purification plant, in particular to a V-shaped air flotation filter. The present invention aims to solve the problem that the hydraulic load of the filter in the existing air flotation filter is not easy to match with the higher hydraulic load of the air flotation tank, the scum in the scum layer during backwashing cannot be completely washed away, and the filter material layer runs away. The problem of mixed phenomenon of material or filter material. The main bodies of the four V-shaped air flotation filters of the present invention are symmetrically arranged on both sides of the water inlet distribution tank, and the partition wall divides the top of each filter into an air flotation contact area and an air flotation separation area. The air-water chamber, filter plate support frame, filter plate, long handle filter head, gravel support layer and quartz sand homogeneous filter material are arranged on the top, and the slag discharge tank is set on the side wall opposite to the partition wall, and the slag scraper passes through The track is connected with the side wall of the filter tank, and the microbubble generating device is connected with the main pipe for conveying the dissolved air water. The invention is especially suitable for the upgrading and transformation of the old water works which have adopted the V-shaped filter tank.

Description

V-type air flotation filter with slag discharge function

technical field

The invention relates to a water quality treatment structure of a water purification plant, in particular to a V-shaped air flotation filter with slag discharge function.

Background technique

At present, when water purification plants deal with high-algae water or low-temperature and low-turbidity water, they often adopt the technology of first air flotation and then filtration. Existing water treatment structures that combine air flotation tanks with mobile hood filters, ordinary fast filters or flap valve filters, due to the characteristics of the structures and operating modes of these different forms of air flotation filters, each has its own characteristics. inadequacies. Air floatation mobile cover filter, when the mobile cover operates to backwash the filter, the disturbance to the scum layer on the water surface is particularly large, affecting the stability of the scum, and the resulting slag blocks the filter material layer of the filter, reducing the hydraulic load of the produced water In order to ensure the separation effect of the air flotation tank, it is necessary to increase the water depth above the filter layer of the filter. At the same time, because the hydraulic load of the mobile cover filter itself is small, it is not easy to match with the higher hydraulic load of the air flotation tank. ; Ordinary air flotation fast filter, because the hydraulic load of ordinary fast filter is low, it is not easy to match with the higher hydraulic load of the air flotation tank, so that it occupies a large area, high investment in infrastructure, and the drop caused by the scum layer on the water surface The slag falls on the filter material and blocks the filter material layer of the filter. Since only water can be used for backwashing, when the backwashing intensity is low, the air-floated scum layer on the filter material layer cannot be backwashed clean. When it is large, a lot of backwash water is wasted, and the central drainage tank is used to drain water and it is easy to cause the filter layer to run out of material. In order to ensure the separation effect of the air flotation tank, it is necessary to increase the water depth above the filter layer of the filter; In the plate valve filter, the scum layer on the surface of the water layer is easy to produce scum and fall to the filter material layer of the filter, blocking or even penetrating the filter material layer, deteriorating the effluent water quality and shortening the backwash cycle. Although the air-water combined backwash is used, However, due to the sequential batch drainage of backwash wastewater, a large amount of filter material in the filter material layer will run to the filter material inlet tank, and the scum in the scum layer cannot be completely washed away. The phenomenon of filter material mixing often occurs during washing, which seriously affects the normal filtering effect of the filter tank.

Contents of the invention

The purpose of the present invention is to solve the problem that in the existing air flotation filter, the hydraulic load of the filter is not easy to match with the higher hydraulic load of the air flotation tank, the floor area is large, and the scum in the scum layer cannot be completely removed during backwashing. If it is washed away, the problem of material running or mixing in the filter material layer also occurs, and then a V-shaped air flotation filter with slag discharge function is provided.

The technical solution of the present invention is: the present invention includes four V-shaped air flotation filter main bodies, water inlet pipes, static mixers, water inlet pneumatic diaphragm valves, thin-walled weirs, V-shaped filter inlet distribution tanks, dissolved air water delivery Pipe assembly, main pipe for dissolved air and water delivery, V-shaped groove, drain valve, quartz sand homogeneous filter material layer, gravel support layer, filter plate, filter plate support frame, long handle filter head, H-shaped tank body, air-water chamber , filter plate support frame, filter plate, multiple long-handle filter heads, gravel support layer, quartz sand homogeneous filter material layer, water seal well, water outlet weir, clean water pipe, backwash inlet pipe and backwash water inlet pipe, it It also includes a slag scraper, a slag discharge tank, a slag discharge pipe and a micro-bubble generating device. The main bodies of the four V-shaped air flotation filters with equal areas and "convex" cross-sections are symmetrically arranged in the inlet of the V-shaped filter. On both sides of the water distribution tank, the convex parts of the "several"-shaped retaining walls of the main body of every two symmetrical V-shaped air flotation filters face each other, and the partition walls in the main body of the V-shaped air flotation filter are set on the "several"-shaped retaining walls Between the "several" shaped retaining wall and the partition wall, there are thin-walled weirs between the opposite side wall, and two water inlet pneumatic diaphragm valves are set under the middle of each "several" shaped retaining wall, each The middle part of the main body of the V-shaped air flotation filter is provided with a through H-shaped tank in the direction perpendicular to the partition wall. The middle partition of the H-shaped tank separates the H-shaped tank into the upper water tank and the lower central air-water distribution. The end of the middle partition of the H-shaped tank, which is close to the partition wall, is inclined downward and connected to the drain valve at the bottom of the partition wall. Each V-shaped air flotation filter body is equipped with an air-water chamber and a filter plate from bottom to top. Support frame, filter plate, multiple long handle filter heads, gravel support layer and quartz sand homogeneous filter material layer, the upper surface of the quartz sand homogeneous filter material layer is located below the upper end surface of the H-shaped tank body, the multiple Two long-handle filter heads are evenly distributed and vertically pass through the filter plate and the filter plate support frame, and the upper and lower partition walls between the H-shaped tank body and the air-water chambers on both sides are respectively provided with horizontally uniform and penetrating air distribution holes and Water square holes, V-shaped grooves parallel to the H-shaped groove body are arranged above the two opposite side walls in the main body of each V-shaped air flotation filter, and V-shaped grooves are evenly distributed with V-shaped grooves sweeping water inlet holes at the lower part of the V-shaped grooves , the top of the quartz sand homogeneous filter material layer in the main body of each V-shaped air flotation filter is the air flotation separation zone, and the tops of a plurality of vertically juxtaposed dissolved air water pipes are connected to form a dissolved air water delivery pipe assembly, and the dissolved air water The conveying pipe assembly is arranged between the partition wall and the thin-walled weir of each V-shaped air flotation filter main body, and the four dissolved air water conveying pipe assemblies communicate with one dissolved air water conveying main pipe. Flotation contact area, the air flotation contact area and the bottom surface of the main body of the V-shaped air flotation filter leave a water inlet gap, the air flotation contact area communicates with the air flotation separation area through the water inlet above the partition wall, and the static mixer is set in the water inlet pipe , the water inlet pipe is connected to one end of the water inlet distribution tank of the V-shaped filter. The other end of the water sealing well is connected to the blower room, and the other end of the backwashing water inlet pipe is connected to the water pump. Two water sealing wells are symmetrically arranged outside the V-shaped air flotation filter, and the two sides of the water sealing well are respectively connected to the adjacent two through pipelines. The central air-water distribution tanks of the main body of the V-shaped air flotation filter are connected, and the two outlet weirs are vertically arranged in the water seal well Inside, the clear water pipe is set on the side wall of the water seal well between the two outlet weirs, and the slag discharge tank is set on the side wall opposite to the partition wall in the main body of the V-shaped air flotation filter, and the slag discharge tank is perpendicular to the The V-shaped groove is located above it. The bottom of the slag discharge tank communicates with the outside of the V-shaped air flotation filter through the slag discharge pipe. The slag machine is parallel to the slag discharge tank and located on it, and the microbubble generating device is connected with the main pipe for dissolving air water delivery.

The present invention has the following beneficial effects: First, the V-shaped filter has a relatively high hydraulic load, can be used in conjunction with an air flotation tank with a relatively high hydraulic load, and can give full play to the advantages of the high hydraulic load of the air flotation tank, solving the problem of the air flotation tank The problem of connecting with the elevation of the V-shaped filter tank, and further reducing the occupied area of the structure, ensures the safety and stability of the effluent water quality, and at the same time adopts the method of gas-liquid two-phase flow mixed dissolved air pump to generate micro-bubbles to increase the hydraulic load of water production; the second , the water depth above the filter material layer of the V-shaped filter can reach 2.0m~2.5m, which can well ensure the separation effect of the air flotation treatment, and there is no need to increase the water depth above the filter material layer, which is especially suitable for the V-shaped filter. The old water plant carried out the transformation of the air flotation filter; thirdly, the V-type filter adopts the average filter material, the filter material layer is thicker, and there will be no mixing of the filter material during backwashing, effectively ensuring the quality of the effluent water; Fourth, the V-shaped filter adopts air-water combined backwashing plus its unique surface sweeping. On the one hand, it can save a lot of backwashing water. On the other hand, the continuous surface sweeping can remove the air-floated scum layer on the water surface The slag generated on the layer is swept and cleaned, avoiding the blockage of the perforated water collection pipe/plate caused by the scum layer of the air flotation scum layer, ensuring the backwashing effect of the filter, prolonging the backwashing cycle of the filter, and ensuring that the filter Outlet water quality; Fifth, by adding a V-groove inlet gate valve, the switch between air flotation-filtration and filtration can be realized, so as to adapt to the high algae and high turbidity of the water to be treated in the water purification plant alternately throughout the year Changes in water quality types such as low temperature and low turbidity increase the scope of application. The invention simplifies the production management process, optimizes the water purification process, reduces investment and operating costs, and saves costs.

Description of drawings

Fig. 1 is a plan view of the present invention (the four V-type air flotation filter main bodies shown in the figure are schematic diagrams cut horizontally by different heights); Fig. 2 is the A-A sectional view of Fig. 1; Fig. 3 is the B-B sectional view of Fig. 1 ; Fig. 4 is a schematic diagram of the filtration working condition of the present invention; Fig. 5 is a schematic diagram of a backwashing working condition of the present invention; Fig. 6 is a structural schematic diagram of a water-sealed well in the present invention; Fig. 7 is a F-F sectional view of Fig. 6; Fig. 8 is Fig. 3 Partial enlarged view E of the V-shaped groove in the present invention; FIG. 9 is a schematic structural diagram of the microbubble generating device of the present invention.

Detailed ways

Embodiment 1: The V-type air flotation filter with slagging function of this embodiment is illustrated in conjunction with Fig. 1 to Fig. 9, which includes four V-type air flotation filter main bodies 11, water inlet pipe 1, static mixer 2, Water inlet pneumatic diaphragm valve 11-16-1, thin-walled weir 4, V-shaped filter inlet distribution tank 6, dissolved air water delivery pipe assembly 7, dissolved air water delivery main pipe 7-1, V-shaped tank 11-1, Drain valve 11-1-3, quartz sand homogeneous filter material layer 11-2, gravel supporting layer 11-3, filter plate 11-4, filter plate support frame 11-5, long handle filter head 11-6, H Shaped tank body 11-7, air-water chamber 11-14, filter plate support frame 11-5, filter plate 11-4, multiple long handle filter heads 11-6, gravel support layer 11-3, quartz sand homogeneity Filter material layer 11-2, water sealing well 8, water outlet weir 8-1, clean water pipe 8-2, backwash inlet pipe 12 and backwash water inlet pipe 13, it also includes slag scraper 11-15, slag discharge tank 11 -8. The slag discharge pipe 11-9 and the microbubble generating device 10, the four main bodies 11 of the V-shaped air flotation filter with the same area and a "convex" shape in cross-section are symmetrically arranged in the water distribution of the V-shaped filter On both sides of the groove 6, the convex parts of the "several" shaped retaining walls 11-16 of every two symmetrical V-shaped air flotation filter main bodies 11 are opposite, and the partition walls 11-17 in the V-shaped air flotation filter main body 11 are set Between "several" shaped retaining walls 11-16 and the opposite side walls, thin-walled weirs 4 are arranged between "several" shaped retaining walls 11-16 and partition walls 11-17, each "several" shaped Two water inlet pneumatic diaphragm valves 11-16-1 are arranged under the middle part of the retaining wall 11-16, and the middle part of each V-shaped air flotation filter main body 11 is provided with a through H valve in the direction perpendicular to the partition wall 11-17. The H-shaped tank 11-7, the middle partition 11-7-3 of the H-shaped tank 11-7 divides the H-shaped tank 11-7 into the upper water tank 11-7-1 and the lower central air-water distribution tank 11 -7-2, an end close to the partition wall 11-17 on the middle partition 11-7-3 of the H-shaped tank body 11-7 is inclined downward and is connected with the drain valve 11-1-3 at the bottom of the partition wall 11-17 Each V-shaped air flotation filter body 11 is provided with an air-water chamber 11-14, a filter plate support frame 11-5, a filter plate 11-4, a plurality of long handle filter heads 11-6, and a gravel bearing from bottom to top. The support layer 11-3 and the quartz sand homogeneous filter material layer 11-2, the upper surface of the quartz sand homogeneous filter material layer 11-2 is located below the upper end surface of the H-shaped tank body 11-7, and the plurality of long handles The filter heads 11-6 are evenly distributed and vertically pass through the filter plate 11-4 and the filter plate support frame 11-5, the upper and lower parts of the partition wall between the H-shaped tank body 11-7 and the air-water chamber 11-14 on both sides The air distribution holes 11-11 and the water square holes 11-12 that are uniformly distributed and penetrated in the horizontal direction are respectively provided, and the top of the two opposite side walls in the main body 11 of each V-shaped air flotation filter is provided with an H-shaped tank body 11-12. 7 Parallel V-shaped grooves 11-1, the lower part of the V-shaped grooves 11-1 is evenly distributed with V-shaped grooves sweeping and washing water inlets 11-1-2, and the quartz sand in the main body 11 of each V-shaped air flotation filter is homogeneous The top of the filter material layer 11-2 is In the air flotation separation area b, the tops of a plurality of vertically juxtaposed dissolved air water pipes are connected to form the dissolved air water delivery pipe assembly 7, and the dissolved air water delivery pipe assembly 7 is arranged on the partition wall 11 of each V-shaped air flotation filter main body 11 Between -17 and the thin-walled weir 4, four dissolved air water delivery pipe assemblies 7 are connected with one dissolved air water delivery main pipe 7-1, and the dissolved air water delivery pipe assemblies 7 form the air flotation contact area a, the air flotation contact area a and the bottom surface of the V-shaped air flotation filter main body 11 leave a water inlet gap, the air flotation contact area a communicates with the air flotation separation area b through the water inlet 11-17-1 above the partition wall 11-17, and the static mixer 2 Set in the water inlet pipe 1, the water inlet pipe 1 communicates with one end of the V-shaped filter inlet distribution tank 6, and one end of the backwash inlet pipe 12 and the backwash water inlet pipe 13 are respectively connected to the main body 11 of each V-shaped air flotation filter The central air-water distribution tank 11-7-2, the other end of the backwash inlet pipe 12 is connected with the blower, the other end of the backwash water inlet pipe 13 is connected with the water pump, and two water seal wells 8 are symmetrically arranged in the V-shaped air flotation filter The outside of the pool and both sides of the water seal well 8 communicate with the central air-water distribution tank 11-7-2 of the two adjacent V-shaped air flotation filter main bodies 11 through pipelines, and the two outlet weirs 8-1 are vertically arranged In the water seal well 8, the clean water pipe 8-2 is set on the side wall of the water seal well 8 between the two outlet weirs 8-1, and the slag discharge tank 11-8 is set on the main body of the V-shaped air flotation filter On the side wall opposite to the partition wall 11-17 in 11, the slag discharge tank 11-8 is perpendicular to the V-shaped groove 11-1 and located above it, and the bottom of the slag discharge tank 11-8 passes through the slag discharge pipe 11-9 and the V-shaped groove. The V-shaped air flotation filter pool is connected to the outside, and the slag scraper 11-15 is connected to the side wall of the V-shaped air flotation filter main body 11 through the rails on both sides. The slag scraper 11-15 is parallel to the slag discharge tank 11-8 and located Above, the microbubble generating device 10 is connected with the main pipe 7-1 for dissolving air water delivery. The gap at the bottom of the air flotation contact area a is the inlet of the water to be treated. In the air flotation contact area a, the water to be treated and the microbubbles contact with the downstream to form foam flocs. The outlet of the air flotation contact area a is set above it, and the bubble flocs The overflow water enters the air flotation separation zone b located on the upper part of the V-shaped air flotation filter main body 11, and the slag scrapers 11-15 are connected with the numerical control equipment. Utilizing the large water head loss of the quartz sand homogeneous filter material layer 11-2 can make the water volume and quality of the air flotation water uniform and stable, save the water collecting perforated pipe, and prevent the perforated pipe from being blocked by the settlement of foam flocs. The V-type air flotation filter adopts constant water level filtration, which is conducive to the stability of scum, and adopts air-water combined backwashing accompanied by surface sweeping. The continuous surface sweeping is beneficial to the floating of scum to the surface of the filter material. The slag is washed to avoid the problem of easy clogging of the surface filter material that may exist in the traditional air flotation filter, effectively prolong the backwash cycle of the filter, and save the water plant's own water consumption. At the same time, the effective water depth up to 2m on the quartz sand homogeneous filter material layer 11-2 can better guarantee the air flotation separation effect as the air flotation separation zone b. In order to further improve the hydraulic load of the V-type air flotation filter, it can be increased On the basis of the quartz sand homogeneous filter material layer, the effective water depth on the filter material layer is increased. In addition, since the water head loss of the filter material layer of the filter is as high as 1.5m~2.0m, the problem of blocking the perforated water collection pipe/plate caused by the use of perforated water collection pipe/plate and the slag drop of the air-floated scum layer is avoided.

Specific embodiment two: The V-type air flotation filter with slagging function of this embodiment is illustrated in conjunction with FIG. 4. Vacuum gauge 10-2, pressure gauge 10-6, pressure reducing valve 10-7, exhaust valve 10-5 and drain valve 10-1, the water pipe passes through drain valve 10-1 and vacuum gauge 10-2 in turn It is connected with the gas-liquid two-phase flow dissolved air pump 10-3, one end of the gas-liquid separation tank 10-4 is connected with the gas-liquid two-phase flow dissolved air pump 10-3, and the other end of the gas-liquid separation tank 10-4 passes through the pressure gauge 10- 6 is connected with the decompression valve 10-7, and the top of the gas-liquid separation tank 10-4 is provided with an exhaust valve 10-5. The dissolved gas part of the microbubble generating device 10 is a gas-liquid two-phase flow dissolved gas pump 10-3. In order to avoid the generation of large bubbles, a gas-liquid separation tank 10-4 is added after the gas-liquid two-phase flow dissolved gas pump 10-3. The pressure reducing valve 10-7 depressurizes to generate microbubbles, so as to produce a sufficient number of small and uniform microbubbles, and can also save the use of expensive and easily blocked microbubble releasers, avoiding the maintenance of the dissolved air releaser device, which is convenient Daily operation and equipment operation management. Other components and connections of this embodiment are the same as those of Embodiment 1.

Specific Embodiment Three: The V-shaped air flotation filter with slagging function of this embodiment is described in conjunction with Fig. 1 and Fig. 2, which also includes a baffle 5, and the baffle 5 is arranged on the dissolved air water delivery pipe assembly 7 and the thin-walled weir 4, the top of the baffle 5 is fixed on the inner wall of the top plate of the V-shaped air flotation filter main body 11, and the bottom of the baffle 5 and the bottom plate of the V-shaped air flotation filter main body 11 are left There are gaps for water entry. The baffle 5 is used to change the flow direction of the water to be treated. The other components and connections of this embodiment are the same as those of Embodiment 1 or Embodiment 2.

Specific Embodiment Four: The V-type air flotation filter with slagging function of this embodiment is described in conjunction with Fig. 1 to Fig. 5, which also includes a V-shaped groove inlet valve 11-1-1, and the partition wall 11-17 A V-shaped groove water inlet 11-1-4 is arranged at the junction with the V-shaped groove 11-1, and the V-shaped groove water inlet 11-1-4 is located above the upper end surface of the V-shaped groove 11-1. The outside of the water port 11-1-4 is provided with a V-shaped groove water inlet gate valve 11-1-1. By controlling the opening of the V-groove water inlet valve 11-1-1, the switching between the two treatment processes of air flotation-filtration and filtration is realized, so as to adapt to the alternate change of the water quality to be treated. The other components and connections of this embodiment are the same as those of Embodiment 1, 2 or 3.

Working principle of the present invention: when high-algae water or low-temperature and low-turbidity water is air flotation filtered, first close the V-shaped groove water inlet gate valve 11-1-1, one end of the water inlet pipe 1 is connected to the sedimentation tank, and the other end is connected to the V-shaped filter. The pool water inlet distribution tank 6 is connected, and the water to be treated mixed by the static mixer 2 in the water inlet pipe 1 enters the water distribution tank 6 from the V-shaped filter, and the water to be treated passes through the water inlet pneumatic diaphragm valve 11-16-1, thin Wall weirs 4 and baffles 5 are evenly distributed into the four V-shaped air flotation filter main bodies 11, and the dissolved air water formed by the gas-liquid two-phase flow dissolved air pump 10-3 and the gas-liquid separation tank 10-4 passes through the pressure reducing valve 10 -7 Decompression produces a sufficient amount of small and uniform microbubbles, and the microbubbles produced collide with the incoming water to be treated at the bottom of the air flotation contact area a to form foam flocs, which flow upward through the outlet of the air flotation contact area a Entering the air flotation separation zone b, the foam flocs are separated in the air flotation separation zone b and rise to the surface to form scum, and the formed scum is scraped by the scum scraper 11-15 installed on the top of the main body 11 of the V-shaped air flotation filter to the drain. The slag tank 11-8 is regularly discharged through the slag discharge pipe 11-9, and the water after the air flotation treatment passes through the quartz sand homogeneous filter material layer 11-2 and the gravel support layer 11-3 of the V-shaped air flotation filter main body 11 , filter plate 11-4 and a plurality of long-handled filter heads 11-6 flow into the air-water chamber 11-14 at the bottom of the filter tank, and then flow into the central air-water distribution tank 11-7-2 through the water square hole 11-12, and finally Through the water seal well 8, the outlet weir 8-1, and the clean water pipe 8-2, it flows to the next treatment structure or is used by users.

When the quality of the water to be treated is not suitable for air flotation treatment, such as the filtration of highly turbid water, the water to be treated is coagulated and precipitated and then the effluent enters the water inlet distribution tank 6 of the V-shaped filter through the water inlet pipe 1, and the V-shaped tank is first opened to enter The sluice valve 11-1-1 does not start the micro-bubble generating device 10, and the water to be treated after mixing and flocculation is evenly distributed into the four V The air flotation contact area a of the main body 11 of the type air flotation filter enters the V-shaped groove 11-1 through the V-shaped groove inlet valve 11-1-1, and then sweeps through the V-shaped groove at the bottom of the V-shaped groove 11-1 The water outlet from the water inlet hole 11-1-2 and the overflow from the top of the tank evenly enter the filter tank, and then pass through the quartz sand homogeneous filter material layer 11-2, gravel support layer 11-3, filter plate 11-4 and multiple long handles The filter head 11-6 flows into the air-water chamber 11-14 at the bottom of the filter, then flows into the central air-water distribution tank 11-7-2 through the water square hole 11-12, and finally passes through the water seal well 8 and the outlet weir 8-1 , The clean water pipe 8-2 flows to the next processing structure or for users to use.

Before the backwashing of the V-type air flotation filter, in order to prevent the damage to the scum caused by the backwashing, use the scum scraper 11-15 to scrape off the scum on the surface of the filter, and at the same time turn down the water inlet pneumatic diaphragm valve 11-16 The degree of opening is such that the water intake just satisfies the amount of water required by the V-shaped groove sweeping water inlet 11-1-2 at the bottom of the V-shaped groove 11-1, and the V-shaped groove inlet valve 11-1-1 is opened so that a part of the water to be treated is The V-shaped groove sweeps and washes the water inlet 11-1-2 into the filter tank, and then opens the drain valve 11-1-3 to discharge the water on the surface of the filter material through the drain tank 11-7 until the filter tank water surface and the drain tank 11-7 Flat top. The backwash process of the V-type air flotation filter is as follows: first step, start the blower, open the intake valve, and the air enters the V evenly through the backwash intake pipe 12 and the air distribution holes 11-11 of the central air-water distribution tank 11-7-2 The bottom of the main body 11 of the type air flotation filter is sprayed by a plurality of long handle filter heads 11-6, and the jetted gas shears and scrubs the impurities on the surface of the filter material layer and suspends them on the surface of the filter material layer; The V-groove sweeping and washing inlet hole 11-1-2 at the bottom of the tank 11-1 continues to feed water into the filter tank, and the horizontal water flow generated on the surface of the filter material layer forms a surface sweeping, and the horizontal water flow pushes impurities to the drainage tank 11-7 -1, start the water pump at the same time, open the backwash water inlet valve, at this time, air and water enter the central air-water distribution tank 11-7-2 through the backwash water inlet pipe 13 at the same time, and then pass through the air distribution hole 11-11 and the water square hole respectively 11-12 evenly enters the air-water chamber 11-14, and then enters the filter material layer through a plurality of long-handled filter heads 11-6, so that the filter material is further washed, and at the same time, the surface cleaning continues; the second step is to close the reverse filter. Flush the intake valve 12-1, stop the air flushing, backwash with water alone for a few minutes, add continuous surface cleaning, and finally flush all the impurities suspended on the surface of the filter material layer into the drainage tank 11-7-1. Among them, the air flushing intensity is 15L/(s·m ² ), the water flushing intensity is 6L/(s·m ² ), and the lateral sweeping intensity is 1.8L/(s·m ² ).

V-shaped air flotation filter with slag discharge function with a scale of 70,000 m ³ /d. The rising flow rate of the water to be treated in the contact area a of the air flotation tank is 20mm/s, the air-water contact time is 1.5min, and the air flotation separation area The downward flow velocity of the water to be treated in b is 3mm/s, the separation time of foam floc and water is 15min, the filtration rate is 10.8m/h, the backwash cycle is 48h, and the lengths of the four V-shaped air flotation filter main bodies 11 are respectively 3.5m in length, 9.7m in width, and a total area of 33.95m ² , the filtered water is used as the dissolved air inlet of the gas-liquid two-phase flow dissolved air pump 10-3, and the reflux ratio is adjusted within the range of 8% to 12%. , wherein the particle size of the quartz sand is 0.95-1.35 mm, and the non-uniformity coefficient K ₈₀ =1.0-1.3.

Claims (4)

1. V-type Airfloat filtering pond with deslagging function; It comprises four V-type Airfloat filtering pond main bodys (11); Water inlet pipe (1); Static mixer (2); Water inlet pneumatic diaphragm valve (11-16-1); Sharp-crested weir (4); V-type filter tank water inlet distributing trough (6); Dissolved air water carrier pipe assembly (7); Dissolved air water is carried supervisor (7-1); V-type groove (11-1); Draining valve (11-1-3); Quartz sand homogeneous filtering material layer (11-2); Gravel supporting layer (11-3); Filter plate (11-4); Filter plate bracing frame (11-5); Strainer head (11-6); H shape cell body (11-7); Air water chamber (11-14); Filter plate bracing frame (11-5); Filter plate (11-4); A plurality of strainer heads (11-6); Gravel supporting layer (11-3); Quartz sand homogeneous filtering material layer (11-2); Trapped well (8); Effluent weir (8-1); Clear water pipe (8-2); Backwash air inlet pipe (12) and backwash water inlet pipe (13); It is characterized in that: it also comprises Slag Scraping Device (11-15); Ash pit (11-8); Scum pipe (11-9) and micro bubble generation device (10); The V-type Airfloat filtering pond main body (11) that described four areas equate and cross section is " protruding " shape is symmetricly set in the both sides of V-type filter tank water inlet distributing trough (6); The protuberance of " several " shape barricade (11-16) of the V-type Airfloat filtering pond main body (11) of per two symmetries is relative; Partition wall (11-17) in the V-type Airfloat filtering pond main body (11) is arranged between " several " shape barricade (11-16) and the sidewall relative with it; Between " several " shape barricade (11-16) and partition wall (11-17), be provided with sharp-crested weir (4); The below at each " several " shape barricade (11-16) middle part respectively arranges two water inlet pneumatic diaphragm valves (11-16-1); The middle part of each V-type Airfloat filtering pond main body (11) is provided with the H shape cell body (11-7) of perforation in the direction perpendicular to partition wall (11-17); The intermediate membrane (11-7-3) of H shape cell body (11-7) is divided into the tank (11-7-1) on top and the central air water distributing trough (11-7-2) of bottom with H shape cell body (11-7); The upper end near partition wall (11-17) of the intermediate membrane (11-7-3) of H shape cell body (11-7) draining valve (11-1-3) downward-sloping and bottom partition wall (11-17) is connected; Be provided with from the bottom to top air water chamber (11-14) in each V-type Airfloat filtering pond main body (11); Filter plate bracing frame (11-5); Filter plate (11-4); A plurality of strainer heads (11-6); Gravel supporting layer (11-3) and quartz sand homogeneous filtering material layer (11-2); The upper surface of quartz sand homogeneous filtering material layer (11-2) is positioned at the below of the upper surface of H shape cell body (11-7); Described a plurality of strainer head (11-6) is uniform and vertically pass filter plate (11-4) and filter plate bracing frame (11-5); Partition wall between the air water chamber (11-14) of H shape cell body (11-7) and its both sides upper; Be respectively arranged with down laterally uniform and the air distribution hole (11-11) and the water square hole (11-12) that connect; The top of two relative sidewalls is provided with the V-type groove (11-1) parallel with H shape cell body (11-7) in each V-type Airfloat filtering pond main body (11); V-type groove (11-1) bottom is evenly equipped with the V-type groove and sweeps and wash inlet opening (11-1-2); The top of the quartz sand homogeneous filtering material layer (11-2) in each V-type Airfloat filtering pond main body (11) is flotation separation zone (b); A plurality of dissolved air water pipe napexes that vertically are set up in parallel communicate and become dissolved air water carrier pipe assembly (7); Dissolved air water carrier pipe assembly (7) is arranged between the partition wall (11-17) and sharp-crested weir (4) of each V-type Airfloat filtering pond main body (11); Four dissolved air water carrier pipe assemblies (7) all carry supervisor (7-1) to communicate with a dissolved air water; Dissolved air water carrier pipe assembly (7) consists of contact zone of dissolved air flotation (a); Contact zone of dissolved air flotation (a) leaves into the water space with the bottom surface of V-type Airfloat filtering pond main body (11); Contact zone of dissolved air flotation (a) communicates with flotation separation zone (b) by the water inlet (11-17-1) of partition wall (11-17) top; Static mixer (2) is arranged in the water inlet pipe (1); Water inlet pipe (1) is communicated with an end of V-type filter tank water inlet distributing trough (6); One end of backwash air inlet pipe (12) and backwash water inlet pipe (13) inserts respectively the central air water distributing trough (11-7-2) of each V-type Airfloat filtering pond main body (11); The other end of backwash air inlet pipe (12) links to each other with air blast; The other end of backwash water inlet pipe (13) links to each other with water pump; Two trapped wells (8) are symmetricly set in the V-type Airfloat filtering pond outside; The both sides of trapped well (8) communicate with the central air water distributing trough (11-7-2) of adjacent two V-type Airfloat filtering pond main bodys (11) respectively by pipeline; Two effluent weirs (8-1) are vertically installed in the trapped well (8); Clear water pipe (8-2) is arranged on the sidewall of the trapped well (8) between two effluent weirs (8-1); Described ash pit (11-8) is arranged on the sidewall relative with partition wall (11-17) in the V-type Airfloat filtering pond main body (11); Ash pit (11-8) is perpendicular to V-type groove (11-1) and the side of being located thereon; The bottom of ash pit (11-8) is interlinked to the outside by scum pipe (11-9) and V-type Airfloat filtering pond pond; Slag Scraping Device (11-15) is connected with the sidewall of V-type Airfloat filtering pond main body (11) by the track of both sides; Slag Scraping Device (11-15) is parallel to ash pit (11-8) and is located thereon, and described micro bubble generation device (10) carries supervisor (7-1) to link to each other with dissolved air water.

2. the V-type Airfloat filtering pond with deslagging function according to claim 1, it is characterized in that: described micro bubble generation device (10) is by biphase gas and liquid flow air dissolved pump (10-3), knockout drum (10-4), vacuum meter (10-2), tensimeter (10-6), reducing valve (10-7), vent valve (10-5) and water discharge valve (10-1) are formed, hydraulic pipe is connected with biphase gas and liquid flow air dissolved pump (10-3) with vacuum meter (10-2) by water discharge valve (10-1) successively, one end of knockout drum (10-4) is connected with biphase gas and liquid flow air dissolved pump (10-3), the other end of knockout drum (10-4) is connected with reducing valve (10-7) by tensimeter (10-6), and the top of knockout drum (10-4) is provided with vent valve (10-5).

3. the V-type Airfloat filtering pond with deslagging function according to claim 1 and 2, it is characterized in that: it also comprises traverse baffle (5), described traverse baffle (5) is arranged between dissolved air water transfer lime assembly (7) and the sharp crested weir (4), the top of traverse baffle (5) is fixed on the inwall of V-type Airfloat filtering pond main body (11) top board, leaves into water space between the base plate of the bottom of traverse baffle (5) and V-type Airfloat filtering pond main body (11).

4. the V-type Airfloat filtering pond with deslagging function according to claim 1 and 2, it is characterized in that: it also comprises V-type groove water inlet gate valve (11-1-1), described partition wall (11-17) is gone up and V-type groove (11-1) joint is provided with V-type groove water-in (11-1-4), V-type groove water-in (11-1-4) is positioned at the top of V-type groove (11-1) upper surface, and the outside of V-type groove water-in (11-1-4) is provided with V-type groove water inlet gate valve (11-1-1).

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