CN104817209A - Buried efficient treater of initial rainwater - Google Patents

Abstract

The invention discloses an underground high-efficiency initial rainwater treatment device. The device integrates coagulation sedimentation, air flotation, rapid filtration technology and intelligent detection, and has the characteristics of small footprint, high processing efficiency, and strong load resistance. It has the ability to automatically adjust the initial rainwater treatment according to the water quality, and quickly treat the initial rainwater with coagulation sedimentation, air flotation, water reoxygenation and filtration, which not only saves energy but also achieves ideal decontamination effects, and has remote monitoring capabilities. Management personnel can monitor the flow and water quality of the drainage pipe network anytime and anywhere, as well as the status of rainwater treatment in the water treatment device, and can perform remote intelligent control, which greatly facilitates the management of the rainwater pipe network and achieves an improvement. The purpose of people's ability to control rain and sewage treatment.

Description

Buried high-efficiency initial rainwater treatment device

technical field

The invention relates to a device for initial rainwater treatment. The device is generally installed on urban combined pipelines or rainwater pipelines, and is suitable for occasions where there is no sewage treatment plant or the treatment capacity of the sewage treatment plant is not enough to treat initial rainwater.

Background technique

In recent years, the problem of environmental pollution in our country has been very serious. Phenomena such as foul-smelling water bodies and smog are quite common. The whole country attaches great importance to it, especially the water environment problem, which has a huge impact on people's lives. At present, my country's urban drainage system mainly includes two types of rain and sewage drainage systems: confluence system and diversion system. Among them, the combined drainage system occupies a dominant position, and the phenomenon of wrong and random connection of urban rainwater and sewage pipe networks is common. Many cities are faced with insufficient treatment capacity of sewage treatment plants. Every time it rains, sewage treatment plants are forced to close the sewage pipe network, resulting in A large amount of initial rainwater and sewage flowed out, causing serious environmental pollution; some developed cities spent a lot of manpower and material resources on rainwater and sewage diversion reconstruction projects, and the diverted rainwater was directly discharged into natural water bodies, so that the sewage was well controlled. However, water pollution has not improved, but has become increasingly severe. After repeated research and analysis, it turned out that the root cause was ignoring the initial rainwater pollution.

The initial rainwater dissolves a large amount of acid gas in the air, vehicle exhaust, factory exhaust gas and other polluting gases in the early stage of rainfall. After landing on the ground, it scours the asphalt concrete road, plus the sewage, sludge and garbage accumulated in the rain sewage channel , so that the rainwater contains a large amount of organic matter, pathogens, heavy metals, grease, suspended solids and other pollutants. Therefore, the pollution degree of the initial rainwater is relatively high, usually exceeding the pollution degree of ordinary urban sewage. Today, with the rapid development of science and technology, people still lack effective control measures and control methods in the face of initial rainwater pollution.

Contents of the invention

The technical problem to be solved by the present invention is that the existing drainage system cannot efficiently treat the polluting initial rainwater, and the arbitrary discharge of the initial rainwater causes a lot of pollution. Therefore, an underground high-efficiency initial rainwater treatment device is provided.

The technical solution of the present invention is: an underground high-efficiency initial rainwater treatment device, which includes an intelligent sewage interception system, a control room with a built-in intelligent control cabinet, a pump room with a built-in blower unit, a gas storage tank and a mixer, and a built-in garbage pool for cleaning Grille filter tank with built-in grid, coagulation sedimentation tank, air flotation tank, slow flow separation tank, fast filter tank and flushing tank, etc. The intelligent sewage interception system includes water inlet pipe, overflow pipe, sewage interception pipe and intercepting wells, the intercepting wells are equipped with water level detection probes, first water quality detection probes and hydraulic flaps respectively connected to the intelligent control cabinet signal, and the sewage intercepting pipeline is connected to the intelligent control cabinet through the first quick-closing The valve is connected to the grid filter pool, the cleaning room is located above the grid filter pool, and one end of the grid filter pool is connected to the sewage pipe network through the second quick-closing valve connected with the signal of the intelligent control cabinet. The filter tank, the coagulation sedimentation tank, the air flotation tank, the slow flow separation tank and the fast filter tank are connected in sequence, and the washing pool is separated from the coagulation sedimentation tank, the air flotation tank, and the slow flow through the pneumatic flushing gate connected with the intelligent control cabinet signal. The tank is connected to the bottom of the quick filter tank, the mixing blade of the mixer extends into the coagulation sedimentation tank, and the microporous aeration plate/pipe connected with the intelligent control cabinet signal is fitted in the air flotation tank, and the microporous aeration The disc/pipe communicates with the gas storage tank through the exhaust pipe. The side of the fast filter is provided with a water outlet, which is lower than the water inlet of the coagulation sedimentation tank. The side of the washing tank is equipped with a washing tank water inlet. , the water inlet of the flushing pool is at the same height as the water outlet, the water outlet and the water inlet of the flushing pool are equipped with flap valves, and a suspended filler filter layer is fitted between the water outlets in the fast filter pool, and the A second water quality detection probe is also arranged in the quick filter tank.

In the above scheme, the air flotation tank includes a first co-directional air flotation tank, a reverse air flotation tank and a second co-directional air flotation tank connected in sequence, the first co-directional air flotation tank communicates with the bottom of the coagulation sedimentation tank, and the reverse Between the air flotation pool and the first air flotation pool in the same direction, there is a first partition that vertically partitions the air flotation pool. The top of the first partition is provided with a communication port. There is a second partition that vertically partitions the air flotation pool, and a communication port is opened at the bottom of the second partition, and a third partition that vertically partitions the air flotation pool is provided between the second codirectional air flotation pool and the slow flow separation pool , the top of the third partition is provided with a communication port, the height of the top surface of the first partition and the third partition are equal, and both are lower than the lower edge of the water outlet, and the microporous aeration disc/pipe is in the air The inner bottom of the floating pool is distributed along the horizontal direction.

The cross section of the slow flow separation tank in the above scheme is larger than that of any one of the coagulation sedimentation tank, the first co-directional air flotation tank, the reverse air flotation tank and the second co-directional air flotation tank.

The bottom of the coagulation sedimentation tank, reverse air flotation tank and slow flow separation tank in the above scheme is provided with a mud collection tank, the mud collection tank is located on the side opposite to the pneumatic flushing gate, and a mud pump is fitted in the mud collection tank .

The suspended filler filter layer in the above scheme includes an upper filter screen, a lower filter screen and a suspended filter filler filled between the upper filter screen and the lower filter screen, and the distance between the suspended filler filter layer and the lower edge of the water outlet is not less than 500mm.

In the above solution, the water level detection probe and the first water quality detection probe are close to the water inlet pipe, the first water quality detection probe is 10 to 20 cm away from the bottom of the interception well, and the second water quality detection probe is close to the water outlet and located in the suspended packing filter layer 10-20cm above.

The grid installation angle of the grid filter tank described in the above scheme is 50°-80° from the horizontal.

The coagulation sedimentation tank, air flotation tank, slow flow separation tank and quick filter tank in the above scheme are equipped with manholes on the top respectively, and the cleaning room, pump room and control room are respectively equipped with doors and windows.

The beneficial effect of the invention is that the device integrates coagulation sedimentation, air flotation, rapid filtration technology and intelligent detection, has the characteristics of small footprint, high processing efficiency, strong load resistance ability, etc., and can quickly mix the initial rainwater. Condensation, air flotation, water reoxygenation and filtration, etc., can effectively remove SS suspended solids and oil pollution in the rainwater brought by the initial rainwater from the combined pipeline, and the removal rate of SS suspended solids can reach more than 90%-99.5% , the removal rate of chroma can reach 70%-95%, and reduce pollution sources such as COD and BOD (reduction of more than 60%); at the same time, the purpose of efficient reoxygenation of treated water can be achieved, and through intelligent monitoring It has improved people's ability to control rain and sewage treatment, and has the advantages of stable and reliable technical performance, high treatment load, strong resistance to water volume and water quality changes, high treatment efficiency, low investment, small land occupation, and convenient maintenance. The sewage treatment plant or the occasion where the treatment capacity of the sewage treatment plant is not enough to treat the initial rainwater.

Description of drawings

Figure 1 is the process schematic diagram of the buried high-efficiency primary rainwater treatment device;

Figure 2 is a layout diagram of the buried high-efficiency primary rainwater treatment device;

Fig. 3 is the A-A sectional view of Fig. 2;

Fig. 4 is the sectional view of B-B of Fig. 2;

Fig. 5 is the sectional view of C-C of Fig. 3;

In the figure, 1. water inlet pipe, 2. sewage intercepting pipe, 3. overflow pipe, 4. interception well, 5. water level detection probe, 6. first water quality detection probe, 7. hydraulic flap, 8. first Quick-closing gate, 9, grille, 10, grille filter tank, 11, second quick-closing gate, 12, sewage pipe network, 13, coagulation sedimentation tank, 14, mud collection tank, 15, mud pump, 16, The first co-directional air flotation tank, 17, reverse air flotation tank, 18, the second co-directional air flotation tank, 19, pneumatic flushing gate, 20, slow flow separation tank, 21, fast filter tank, 22, flushing tank, 23, water outlet , 24. Flap door, 25. Flush tank water inlet, 26. Cleaning room, 27. Garbage tank, 28. Intelligent control cabinet, 29. Control room, 30. Blower unit, 31. Gas storage tank, 32. Mixer, 33. Pump room, 34. Manhole, 35. Doors and windows, 36. Exhaust pipe, 37. Microporous aeration disc/pipe, 38. Second water quality probe, 39. Suspended filler filter layer, 40. First partition , 41, the second partition, 42, the third partition.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

As shown in Figures 1-5, the present invention mainly includes an intelligent sewage interception system, a control room 29 with a built-in intelligent control cabinet 28, a pump room 33 with a built-in blower unit 30, an air storage tank 31 and a mixer 32, and a built-in garbage pool 27. Cleaning room 26, grid filter tank 10 with built-in grid 9, coagulation sedimentation tank 13, air flotation tank, slow flow separation tank 20, fast filter tank 21 and flushing tank 22, and the intelligent sewage interception system includes water inlet pipes 1. The overflow pipeline 3, the sewage intercepting pipeline 2 and the interception well 4, the water level detection probe 5, the first water quality detection probe 6 and the hydraulic flap 7 respectively connected with the intelligent control cabinet signal are adapted in the said interception well 4, The sewage intercepting pipeline communicates with the grid filter tank 10 through the first quick-closing valve 9 connected with the intelligent control cabinet signal, the cleaning room 26 is located above the grid filter tank 10, and one end of the grid filter tank 10 passes through The second quick-closing valve 11 connected with the signal of the intelligent control cabinet is connected with the sewage pipe network 12, and the grid filter tank 10, the coagulation sedimentation tank 13, the air flotation tank, the slow flow separation tank 20 and the fast filter tank 21 are connected in sequence, The connection between the coagulation-sedimentation tank 13 and the air flotation tank is located at the bottom of the coagulation-settling tank, and the flushing tank 22 is separated from the coagulation-settling tank 13, the air flotation tank, and the slow flow through the pneumatic flushing gate 19 connected with the intelligent control cabinet signal. The bottoms of pool 20 and quick filter tank 21 etc. are communicated, and the stirring vane of described mixer 32 stretches in the coagulation sedimentation tank 13, and the air flotation tank can comprise the first same direction air flotation tank 16, reverse air flotation tank 17 and the second that are arranged and communicated successively. The same direction air flotation tank 18, the first same direction air flotation tank 16 communicates with the bottom of the coagulation sedimentation tank 13, so that the water flow enters the first same direction air flotation tank 16 from the bottom of the coagulation sedimentation tank 13 when passing through. Between the reverse air flotation tank 17 and the first same direction air flotation tank 16, there is a first partition 40 that vertically partitions the air flotation tank, and the top of the first partition 40 is provided with a communication port, so that when the water flows through the first same direction The top of the air flotation pool 16 diffuses into the reverse air flotation pool 17, and between the second same direction air flotation pool 18 and the reverse air flotation pool 17, there is a second dividing plate 41 that vertically partitions the air flotation pool, and the bottom of the second dividing plate 41 A communication port is provided so that the water flows from the bottom of the reverse air flotation pool 17 into the second co-directional air flotation pool 18 when the water flow passes by. Three partitions 42, the top of the third partition 42 is provided with a communication port, so that the water flows from the top of the second co-directional air flotation tank 18 into the slow flow separation tank 20 when passing through. The microporous aeration disc/pipe 37 connected with the signal of the intelligent control cabinet is adapted in the air flotation tank, and the microporous aeration disc/tube 37 is distributed along the horizontal direction at the bottom of the air flotation tank, The air tray/pipe 37 communicates with the gas storage tank 31 through the exhaust pipe 36, and the fast filter tank 21 side is provided with a water outlet 23, and the water outlet 23 is lower than the water inlet of the coagulation sedimentation tank 13, and the said flushing tank 22 One side is fitted with the water inlet 25 of the washing pool, and the water inlet 25 of the washing pool is of the same height as the water outlet 23. The water outlet 23 and the water inlet 25 of the washing pool are equipped with a valve 24, and the fast filter The bottom of the water outlet 23 in the 21 is fitted with a suspended filler filter layer 39, and a second water quality detection probe 38 is also provided in the fast filter 21, and the height of the first dividing plate 40 and the third dividing plate 42 is lower than Water outlet 23, in order to ensure the sedimentation effect of the slow flow separation tank 20, the cross section of the slow flow separation tank 20 is larger than the coagulation sedimentation tank 13, the first co-directional air flotation tank 16, the reverse air flotation tank 17 and the second co-directional air flotation tank 18 The cross-section of any one of them is conducive to slowing down the water flow.

The bottom of the coagulation sedimentation tank 13, the reverse air flotation tank 17 and the slow flow separation tank 20 is provided with a mud collection tank 14. The mud collection tank is located on the side opposite to the pneumatic flushing gate, and a mud pump 15 is fitted in the mud collection tank. Drain the deposited debris.

Suspended filler filter layer 39 can include upper filter screen, lower filter screen and the suspended filter filler filled between the upper filter screen and the lower filter screen, and the suspended filler filter layer 39 is not less than 500mm from the lower edge of water outlet 23 to prevent The water flow passing through the water outlet disturbs the suspended packing filter layer.

The tops of the coagulation sedimentation tank 13, the air flotation tank, the slow-flow separation tank 20 and the fast filter tank 21 are respectively equipped with manholes 34, and the cleaning room 26, the pump room 33 and the control room 29 are respectively equipped with doors and windows 35.

The water level detection probe 5 and the first water quality detection probe 6 are close to the water inlet pipe 1, the first water quality detection probe 6 is preferably 10-20 cm away from the bottom of the interception well 4, and the second water quality detection probe 38 is preferably close to the water outlet 23 And it is located 10-20 cm above the suspended filler filter layer 39 .

In order to ensure the best dirt-blocking effect of the grille 9, the installation angle of the grille 9 of the grille filter pool 10 is preferably 50°-80° from the horizontal.

Among them, the first water quality detection probe 6, the water level detection probe 5, the hydraulic flap 7, the mixer 32, the microporous aeration disc/pipe 37, the blower 30, the gas storage tank 31, the second water quality detection probe 38, the first quick closing The valve 8, the second quick-closing valve 11 and the pneumatic flushing gate 19 are all connected with the signal of the intelligent control cabinet 28, and are controlled and integrated by it.

The working principle of the present invention is as follows:

When working, first detect the detection data of the first water quality probe in the interception well, compare the water quality data signal with the set value of direct drainage, and confirm the water quality status flowing through the water inlet pipe. If the water quality is good, it meets the requirements of the direct drainage specification. Smart The control cabinet sends a signal to close the first quick-closing gate, and the first quick-closing gate is controlled to automatically close the sewage interception pipe, and the clean rainwater flowing from the water inlet pipe is collected in the interception well. When the water level reaches the set water level, the hydraulic flap automatically Open, the clean rainwater can be discharged directly; if the water quality flowing through the water inlet pipe does not meet the requirements of the direct drainage specification, the hydraulic flap will act as a weir plate, and the intelligent control cabinet will automatically open the first-speed closing gate, and the water will flow in through the grid filter. Grille filter pool removes some larger suspended solids through the grille; at the same time, the intelligent control cabinet further identifies the detection signal of the first water quality probe to confirm the pollution degree of the inflowing water. If the pollution degree is higher than that of the heavy sewage device If the pollution degree is lower than the set value of severe sewage, the water flow is medium and lightly polluted, the second-speed closing gate is closed, and the water flow enters the coagulation In the sedimentation tank, the pretreatment of coagulation and sedimentation is carried out, so that some larger particles are deposited in the mud collection tank, and they are removed by the mud pump. At this time, the intelligent control cabinet determines the dosage of the retarder and whether the mixer is working according to the degree of pollution. and working strength, etc.; the water flow enters the air flotation tank after coagulation and sedimentation, first enters the first co-directional air flotation tank from the bottom of the coagulation sedimentation tank, then flows into the reverse air flotation tank from the top of the first co-directional air flotation tank, and then flows from the bottom of the reverse air flotation tank It flows into the second air flotation tank in the same direction through the second partition, and the water flow direction is alternately changed up and down repeatedly. The water in the air flotation tank flows evenly. A large number of tiny micro-bubbles are ejected to form a three-phase mixture of water, gas and the substance to be removed. Under the combined action of interfacial tension, bubble buoyancy and hydrostatic pressure difference, the micro-bubbles are promoted to adhere to the surface to be removed. After the tiny oil particles and other organic matter are attached, they float to the water surface because the density of the bonded body is lower than that of water. Since the height of the first partition between the first co-directional air flotation pool and the reverse air flotation pool is lower than the height of the water outlet, the water flow from the first When the same-direction air flotation tank overflows to the reverse air flotation tank through the first partition, the water flow does not disturb the SS suspended matter and oil stains on the water surface. The separator is blocked and thus separated and removed. Not only can the oil in the emulsified state be removed in the sewage, but also the impurities in the state of fine suspended particles whose density is close to that of water can be removed. The water flows in the air flotation tank and passes through the water and air Alternate direction and opposite direction of water and air, not only improves the effect of air flotation, but also enhances the effect of water reoxygenation; after the water flow is treated by air flotation, it enters the slow flow separation tank. Due to the large cross-sectional area of the slow flow separation tank, the water flow The speed slows down, and the remaining impurities are precipitated again, and the sediment is pumped away by the mud pump in the mud collection tank, and sent to the sewage pipe network; the water flow enters the fast filter tank from the bottom of the slow flow diversion tank, so that the suspended solids that have been treated by air flotation treatment and floated stay On the surface of the slow-flow separation tank, further removal of S Suspended solids and oil stains, etc.; after the water flow is filtered by the suspended packing filter layer in the fast filter, the water quality meets the set discharge requirements, and it is discharged from the water inlet and outlet of the flushing pool respectively, and the clean water enters the flushing through the water inlet of the flushing pool Pool, using the valve on the water inlet of the flushing pool to fill the flushing pool with water, when the grid filter tank, coagulation sedimentation tank, air flotation tank, slow flow separation tank and fast filter tank (also called water treatment tank) When the sediment in the tank needs to be cleaned up, close the first quick-closing gate, and use the mud pump to drain the water in the water treatment tank. At this time, under the action of the blower, enough gas is stored in the gas storage tank, and the intelligent control system passes through the control The valve on the exhaust pipe opens the pneumatic flushing gate, and the water in the flushing tank washes the sediment at the bottom of the water treatment tank under the action of gravity. After flushing, the sediment is brought into the sludge collection tank under the action of the flushing water flow , the intelligent control system automatically starts the mud pump to discharge the sludge, which can realize the regular or irregular automatic flushing function; a flap door that can prevent backflow is set outside the water outlet of the fast filter tank to prevent the water level at the water outlet from rising due to heavy rain. Backflow into the water treatment tank.

Since the water level at the inlet of the coagulation sedimentation tank is higher than the water level at the outlet of the quick filter tank, the water flows through the water treatment tank under the action of gravity. When the water level difference between the water inlet of the coagulation sedimentation tank and the outlet of the quick filter tank When it is larger, the water flow in the device is faster, and the intelligent control cabinet automatically adjusts the strength of coagulation sedimentation and microporous aeration, as well as the dosage of retarder, through the detection data of the second water quality detection probe, thereby changing the coagulation sedimentation. and the effect of air flotation to realize the automatic control and adjustment function of water treatment; when the air flotation and other devices in the device need maintenance, close the first quick-closing gate, the second quick-closing gate and the pneumatic flushing gate, and use the mud pump to drain the water in the device , maintenance personnel enter the device through the manhole to carry out inspection and maintenance work.

The intelligent control cabinet is interconnected with the mobile network, so that the device can not only automatically adjust the initial rainwater treatment according to the water quality, save energy and achieve the ideal decontamination effect, but also has remote monitoring capabilities, and the management personnel can monitor the drainage pipe anytime and anywhere The flow and water quality of the network, as well as the status of rainwater and sewage treatment in the water treatment device, and remote intelligent control can be carried out, which greatly facilitates the management of the rainwater and sewage pipe network, and achieves the goal of improving people's ability to control rainwater and sewage treatment Purpose.

The device has short water retention time, natural water distribution, small water disturbance, low SS suspended solids and grease in the effluent, the removal rate can reach more than 90%-99.5%, and the removal rate of chroma can reach 70%-95%. COD and BOD also have a good reduction effect. At the same time, the water flow is re-oxygenated to enhance the activity of the water body and improve the water quality. After the initial rainwater is treated, the water level difference between the inlet and outlet of the water treatment tank is used to discharge it into the water body through gravity flow, without the need for power equipment to upgrade, which greatly saves energy.

Claims (5)

1. buried efficient early-stage rainwater treatment unit, it is characterized in that it comprises intelligence and cuts dirty system, the watch-keeping cubicle of built-in intelligence housing, built-in blower unit, the pump house of gas-holder and stirrer, between the removing contamination of built-in garbage pool, the grid filtration pond of built-in grille, coagulative precipitation tank, air flotation pool, unhurried current separate tank, rapid filter and flushing tank etc., described intelligence is cut dirty system and is comprised inlet channel, overflow spout, wastewater interception pipe and Vatch basin, in described Vatch basin, adaptation has the water level detecting probe be connected with Intelligent control cabinet signal respectively, first water quality detection probe and waterpower turnover panel, described wastewater interception pipe is communicated with grid filtration pond by the first quick close valve be connected with Intelligent control cabinet signal, described remove contamination between be positioned at above grid filtration pond, one end, described grid filtration pond is communicated with sewage network by the second quick close valve be connected with Intelligent control cabinet signal, described grid filtration pond, coagulative precipitation tank, air flotation pool, unhurried current separate tank is communicated with successively with rapid filter, described flushing tank by the pneumatic flush gate that is connected with Intelligent control cabinet signal respectively with coagulative precipitation tank, air flotation pool, unhurried current separate tank is communicated with bottom rapid filter, the paddle of described stirrer stretches in coagulative precipitation tank, in described air flotation pool, adaptation has the microporous aeration disc/pipe be connected with Intelligent control cabinet signal, described microporous aeration disc/pipe is communicated with gas-holder by gas exhaust duct, described rapid filter side is provided with water outlet, water outlet is lower than coagulative precipitation tank water-in, described flushing tank side adaptation has flushing tank water-in, described flushing tank water-in and water outlet contour, on described water outlet and flushing tank water-in, all adaptation has flap valve, in described rapid filter below water outlet between adaptation have floating stuffing filtering layer, the second water quality detection probe is also provided with in described rapid filter.

2. buried efficient early-stage rainwater treatment unit as claimed in claim 1, it is characterized in that described air flotation pool comprises the first air flotation pool being in the same way arranged in order connection, reverse air flotation pool and second air flotation pool in the same way, described first in the same way air flotation pool be communicated with the bottom of coagulative precipitation tank, described reverse air flotation pool and first is provided with the first dividing plate of air flotation pool vertical partition wall in the same way between air flotation pool, described first dividing plate top offers connected entrance, described second is provided with between air flotation pool and reverse air flotation pool in the same way by the second partition of air flotation pool vertical partition wall, connected entrance is offered bottom described second partition, described second in the same way air flotation pool ease up stream separate tank between be provided with the 3rd dividing plate of air flotation pool vertical partition wall, described 3rd dividing plate top offers connected entrance, the first described dividing plate is equal with the 3rd dividing plate apical side height, all lower than bead under water outlet, described microporous aeration disc/pipe distributes in the horizontal direction at air flotation pool inner bottom part.

3. buried efficient early-stage rainwater treatment unit as claimed in claim 2, is characterized in that the cross section of described unhurried current separate tank is greater than coagulative precipitation tank, first air flotation pool, reverse air flotation pool and second any one cross section in air flotation pool in the same way in the same way.

4. buried efficient early-stage rainwater treatment unit as claimed in claim 1, it is characterized in that described coagulative precipitation tank, reverse air flotation pool gentle stream separate tank inner bottom part is provided with mud-collecting slot, described mud-collecting slot is positioned at the side relative with pneumatic flush gate, and in described mud-collecting slot, adaptation has slush pump.

5. buried efficient early-stage rainwater treatment unit as claimed in claim 1, it is characterized in that described floating stuffing filtering layer comprises upper filter screen, lower filter screen and is filled in the floated filter packing between upper filter screen and lower filter screen, along being not less than 500mm under described floating stuffing filtering layer distance water outlet.