CN210528716U - Domestic sewage A/O processing system - Google Patents

Abstract

The utility model relates to a domestic sewage treatment technical field, more specifically say, relate to a domestic sewage AO processing system. Through the treatment of grid pond, grit chamber, equalizing basin, A pond, O pond, two sedimentation tanks, under the prerequisite of guaranteeing to handle quality of water discharge up to standard, guaranteed low construction cost and operation maintenance simple and convenient. Wherein, the preliminary treatment pond is provided with the catch basin, grid and grit chamber, the catch basin is used for the temporary storage of water when clearing up the grid, the grid is mobile fixed knot structure, wherein the board of decontaminating is for not having the through-hole setting, make the filth of being intercepted by the grid to be stranded on the limit, the clearance of being convenient for, grit chamber bottom sets up in the board below of decontaminating, utilize the suction dredge just can be smoothly with mud suction when the clearance, moreover, the operation is simple, need not to dig additional mud discharge passageway underground, the preliminary treatment pond of this system makes grid clearance and grit chamber mud discharge become simply high-efficient, easy maintenance simultaneously, safety.

Description

Domestic sewage A/O processing system

Technical Field

The utility model relates to a domestic sewage treatment technical field, more specifically say, relate to a domestic sewage AO processing system.

Background

Rural domestic sewage is mainly from kitchen cooking water, bath water, washing water, water for flushing toilets and the like, wherein the content of organic matters is high, a large amount of organic matters and N, P and other substances flow into rivers and other water bodies due to unconscious discharge of people and washing of rainwater, and if the organic matters and N, P and other substances are not utilized, eutrophication is often caused, and adverse effects are brought to the health of people. Most rural domestic sewage has little difference in properties, the water basically does not contain heavy metals and toxic and harmful substances, contains a certain amount of nitrogen and phosphorus, and has strong biodegradability. In the existing sewage treatment system, the grid treatment is easy to block, and a water inlet source needs to be closed when the grid is cleaned, so that the normal sewage discharge is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a domestic sewage AO processing system.

In order to achieve the above purpose, the utility model provides a technical scheme does:

an A/O treatment system for domestic sewage comprises a pretreatment tank, an adjusting tank, an A tank, an O tank, a secondary sedimentation tank, a micro-ecological filter bed and a clean water tank, wherein the system is of an integrated structure, and the pretreatment tank, the adjusting tank, the A tank, the O tank, the secondary sedimentation tank, the micro-ecological filter bed and the clean water tank are sequentially connected in parallel; the pretreatment tank comprises a water collecting tank, a grid and a grit chamber, the water collecting tank is arranged below the water inlet, the grid is arranged below the water collecting tank, and the grit chamber is arranged below the grid; an opening in the middle of the pretreatment tank is communicated with the regulating tank; the lower part of the regulating tank is communicated with the lower part of the tank A; an overflow pipe is arranged at the upper part of the A tank, an outlet of the overflow pipe is communicated with the O tank, the upper part of the O tank is communicated with a secondary sedimentation tank, the secondary sedimentation tank is communicated with the micro-ecological filter bed through a water distribution pipe, an inlet of the water distribution pipe is arranged at the middle part of the secondary sedimentation tank, and an outlet of the water distribution pipe is arranged above the micro-ecological filter bed; the micro-ecological filter bed comprises a pretreatment section and a layered treatment section, wherein the pretreatment section is provided with a first cobble layer, the layered treatment section is sequentially provided with a soil layer, a gravel layer and a second cobble layer from top to bottom, a masonry is arranged between the pretreatment section and the layered treatment section, a water trough is arranged at the lower part of the masonry and communicates the first cobble layer with the second cobble layer, a water collecting pipe is arranged above the layered treatment section of the micro-ecological filter bed, and an outlet of the water collecting pipe is communicated with a clean water pool; domestic sewage is discharged after passing through the pretreatment tank, the adjusting tank, the A tank, the O tank secondary sedimentation tank, the microecological filter bed and the clean water tank in sequence.

Further, the grid includes grid otter board and the board of decontaminating, the grid otter board is the platelike of constituteing by parallel bars, the grid otter board is fixed in the preliminary treatment pond with the board of decontaminating, the grid otter board is connected with the board of decontaminating is articulated.

Furthermore, an included angle between the grid mesh plate and the trash cleaning plate is 150-175 degrees, and the trash cleaning plate is parallel to the ground.

Furthermore, the bottom of the grit chamber is of a quadrangular prism structure, the area of the bottom surface of the grit chamber is smaller than that of the top surface, and the bottom surface of the grit chamber is positioned under the dirt removing plate.

Further, the pretreatment tank is provided with the platform of decontaminating outward, and the pretreatment tank has seted up the mouth of decontaminating near platform one side of decontaminating, clear dirty board top is gone up to the mouth of decontaminating, clear dirty board below is gone up to the mouth of decontaminating, clear dirty mouthful is provided with the door of decontaminating.

Further, the O-cell was continuously blown with fresh air by a blower.

Further, the height of cobblestones in the pretreatment section is 1100 mm; the height of a soil layer in the layering treatment section is 300mm, the height of a gravel layer is 200mm, and the height of a cobblestone layer is 600 mm.

Furthermore, the grating regularly cleans impurities, and the grit chamber and the secondary sedimentation tank regularly clean sludge at the bottom of the tank.

Further, sludge in the grit chamber and the secondary sedimentation tank is recovered by adopting a sludge-water separator, and the sludge-water separator is arranged on the sewage disposal platform; the mud-water separator comprises a sludge area, a sewage area, a push rod and a power mechanism; the sludge area is positioned above the sewage area, a push rod is arranged in the sludge area, and the push rod provides power for reciprocating motion through a power mechanism; a filtering partition plate is arranged between the sludge area and the sewage area; a sludge inlet pipe is arranged in the middle of the top of the sludge area, and a first sludge outlet and a second sludge outlet are symmetrically arranged at the bottom of the sludge area in the motion direction of the push rod; a sewage outlet pipe is arranged in the middle of the bottom of the sewage area; the sludge inlet pipe is communicated with the outlet of the sludge pump, and the inlet of the sludge pump is communicated with the sludge outlet pipe of the secondary sedimentation tank and the sludge suction hose; the sewage outlet pipe extends into the pretreatment tank.

Furthermore, the walls of the pretreatment tank, the adjusting tank, the A tank, the O tank, the secondary sedimentation tank and the clean water tank are made of carbon steel anti-corrosion materials; the micro-ecological filter bed adopts masonry.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

the utility model provides a domestic sewage AO processing system, through preliminary treatment pond, equalizing basin, A pond, O pond, the preliminary treatment in two heavy ponds, hydrolyze starch, fibre, suspended solid and soluble organic matter such as carbohydrate in the sewage into organic acid, aerobic microorganism nitrifies and gets rid of CODcr, BOD₅And phosphorus, and further precipitating a dropped biological film and small organic and inorganic particles which are not precipitated through mud-water separation, wherein the sludge precipitated in the secondary sedimentation tank flows back to the grit chamber to provide activated sludge strains for the tank A and complete the denitrification process. The micro-ecological filter bed not only ensures that nitrogen and phosphorus in the wastewater can be absorbed as nutrients by plants and microorganisms, but also can be removed by nitrification and denitrification. On the premise of ensuring that the treated water quality is discharged up to the standard, the low construction cost is ensuredAnd the operation and maintenance are simple and convenient. Wherein, the preliminary treatment pond is provided with the catch basin, grid and grit chamber, the catch basin is used for the temporary storage of water when clearing up the grid, the grid is mobile fixed knot structure, wherein the board of decontaminating is for not having the through-hole setting, make the filth of being intercepted by the grid to be stranded on the limit, the clearance of being convenient for, grit chamber bottom sets up in the board below of decontaminating, utilize the suction dredge just can be smoothly with mud suction when the clearance, moreover, the operation is simple, need not to dig additional mud discharge passageway underground, the preliminary treatment pond of this system makes grid clearance and grit chamber mud discharge become simply high-efficient, easy maintenance simultaneously, safety.

Drawings

FIG. 1 is a structural diagram of an A/O treatment system for domestic sewage according to the present invention;

FIG. 2 is a sectional view of an A/O treatment system for domestic sewage according to the present invention;

FIG. 3 is a schematic view of a mud-water separator;

FIG. 4 is a schematic view showing the state of the grid cleaning in the pretreatment tank;

FIG. 5 is a schematic view showing the state of cleaning in the grit chamber in the pretreatment tank.

In the figure: 1 is a pretreatment tank, 2 is an adjusting tank, 3 is a tank A, 4 is an O tank, 5 is a secondary sedimentation tank, 6 is a micro-ecological filter bed, 7 is a clean water tank, 8 is a water collecting tank, 9 is a grid, 10 is a grit chamber, 11 is an overflow pipe, 12 is a water distribution pipe, 13 is a pretreatment section, 14 is a layered treatment section, 15 is a first cobble layer, 16 is a soil layer, 17 is a gravel layer, 18 is a second cobble layer, 19 is a masonry, 20 is a water trough, 21 is a water collecting pipe, 22 is a grid screen plate, 23 is a cleaning plate, 24 is a cleaning platform, 25 is a cleaning port, 26 is an air blower, 27 is a mud-water separator, 28 is a sludge area, 29 is a sewage area, 30 is a push rod, 31 is a power mechanism, 32 is a filtering baffle plate, 33 is sludge, 34 is a first sludge outlet, 35 is a second sludge outlet, 36 is a sewage outlet pipe, 37 is a sludge outlet pipe, 38 is a sludge suction hose, 39 is a saw tooth, 40 is a driving gear, Reference numeral 41 denotes a driven gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, an a/O treatment system for domestic sewage comprises a pretreatment tank 1, an adjusting tank 2, an a tank 3, an O tank 4, a secondary sedimentation tank 5, a micro-ecological filter bed 6 and a clean water tank 7, wherein the system is of an integrated structure, and the pretreatment tank 1, the adjusting tank 2, the a tank 3, the O tank 4, the secondary sedimentation tank 5, the micro-ecological filter bed 6 and the clean water tank 7 are sequentially connected in parallel; the pretreatment tank 1 comprises a water collecting tank 8, a grating 9 and a grit chamber 10, wherein the water collecting tank 8 is arranged below the water inlet, the grating 9 is arranged below the water collecting tank 8, and the grit chamber 10 is arranged below the grating 9; an opening in the middle of the pretreatment tank 1 is communicated with the adjusting tank 2; a sewage lifting pump is arranged at the bottom of the adjusting tank 2, and sewage in the adjusting tank 2 is lifted to the tank A3 through the sewage lifting pump; an overflow pipe 11 is arranged at the upper part of the A tank 3, the outlet of the overflow pipe 11 is communicated with an O tank 4, the upper part of the O tank 4 is communicated with a secondary sedimentation tank 5, the secondary sedimentation tank 5 is communicated with a micro-ecological filter bed 6 through a water distribution pipe 12, the water distribution pipe is a pipeline with an opening at the middle part for water inlet and closed two ends, a pipe body is provided with water outlet holes side by side, the inlet of the water distribution pipe 12 is arranged at the middle part of the secondary sedimentation tank 5, and the outlet of the water distribution pipe 12 is arranged above the micro-ecological; the micro-ecological filter bed 6 comprises a pretreatment section 13 and a layering treatment section 14, wherein the pretreatment section 13 is provided with a first cobble layer 15, the layering treatment section 14 is sequentially provided with a soil layer 16, a gravel layer 17 and a second cobble layer 18 from top to bottom, a masonry 19 is arranged between the pretreatment section 13 and the layering treatment section 14, a water trough 20 is arranged at the lower part of the masonry 19, the water trough 20 communicates the first cobble layer 15 with the second cobble layer 18, a water collecting pipe 21 is arranged above the layering treatment section 14 of the micro-ecological filter bed 6, and the water collecting pipe is a pipe body provided with water filtering holes, one end of the water collecting pipe is closed, and the other end of the water collecting pipe is communicated with a clean water pool 7; domestic sewage is discharged after passing through the pretreatment tank 1, the adjusting tank 2, the A tank 3, the O tank 4, the secondary sedimentation tank 5, the micro-ecological filter bed 6 and the clean water tank 7 in sequence. Grid 9 includes grid otter board 22 and the board 23 of decontaminating, grid otter board 22 is the platelike of constituteing by parallel bars, grid otter board 22 is fixed in preliminary treatment pond 1 with the board 23 of decontaminating, grid otter board 22 is connected with the board 23 of decontaminating is articulated. The included angle between the grid mesh plate 22 and the trash cleaning plate 23 is 150-175 degrees, and the trash cleaning plate 23 is parallel to the ground. The bottom of the grit chamber 10 is of a quadrangular prism structure, the area of the bottom surface of the grit chamber 10 is smaller than that of the top surface, and the bottom surface of the grit chamber 10 is positioned under the dirt removing plate. Pretreatment pond 1 is provided with the platform of decontaminating 24 outward, and pretreatment pond 1 has seted up the mouth of decontaminating 25 being close to platform of decontaminating 24 one side, clear dirty board 23 top is being decontaminated above the mouth of decontaminating 25, clear dirty board 23 below the mouth of decontaminating 24, clear dirty mouth 25 is provided with the door of decontaminating, and when the door of decontaminating was closed, the mouth of decontaminating was sealed watertight. The O-cell 4 is constantly being blown with fresh air by means of a blower 26. The height of the first cobble layer 15 in the pretreatment section 13 is 1100 mm; in the layering processing section 14, the height of a soil layer 16 is 300mm, the height of a gravel layer 17 is 200mm, the height of a second cobble layer 18 is 600mm, and floral leaf arundo donax, yellow flag and the like are planted on the soil layer 16. The grating 9 is used for periodically cleaning impurities, and the grit chamber 10 and the secondary sedimentation tank 11 are used for periodically cleaning sludge at the bottom of the sedimentation tank. The walls of the pretreatment tank 1, the adjusting tank 2, the A tank 3, the O tank 4, the secondary sedimentation tank 5 and the clean water tank 7 are made of carbon steel anti-corrosion materials; the micro-ecological filter bed 6 is made of masonry.

As shown in fig. 3, the sludge in the grit chamber and the secondary sedimentation tank is recovered by a sludge-water separator 27 which is arranged on the sewage disposal platform 24; the mud-water separator 27 comprises a sludge area 28, a sewage area 29, a push rod 30 and a power mechanism 31; the sludge area 28 is positioned above the sewage area 29, a push rod 30 is arranged in the sludge area 28, and the push rod 30 provides power for reciprocating motion through a power mechanism 31; a filtering partition plate 32 is arranged between the sludge area 28 and the sewage area 29; a sludge inlet pipe 33 is arranged in the middle of the top of the sludge area 28, and a first sludge outlet 34 and a second sludge outlet 35 are symmetrically arranged at the bottom in the moving direction of the push rod 30; a sewage outlet pipe 36 is arranged in the middle of the bottom of the sewage area 29; the sludge inlet pipe 33 is communicated with the outlet of a sludge pump, and the inlet of the sludge pump is communicated with a sludge outlet pipe 37 and a sludge suction hose 38 of the secondary sedimentation tank 5; the sewage outlet pipe 37 extends into the pretreatment tank 1. The tail end of the push rod 30 extends into the power mechanism 31, the upper end face of the tail end of the push rod 30 is provided with saw teeth 39, a driving gear 40 and a driven gear 41 are arranged above the push rod 30, and the driving gear 40, the driven gear 41 and the saw teeth 39 are meshed in pairs respectively; the driving gear 40 is an incomplete gear, two groups of teeth are symmetrically arranged on the driving gear 40, the center of the driving gear 40 is fixedly connected with a motor shaft of the motor, the power mechanism 31 controls the push rod to reciprocate within a certain range, and the movement range is controlled by the diameter of the driving gear 40 and the height of the sawteeth 39.

Domestic sewage flows into pretreatment tank 1 after the pipe network is collected, and great suspended solid, floater and ribbon in the aquatic are got rid of to grid 9 in pretreatment tank 1, and the gravity flow gets into grit chamber 10, through large granule self action of gravity in grit chamber 10, sinks in grit chamber 10 bottom, and the supernatant flows into equalizing basin 2. After the water quality of the sewage is regulated in the regulating tank 2, the sewage enters the tank A3, heterotrophic bacteria hydrolyze starch, fiber, carbohydrate and other suspended matters and soluble organic matters in the sewage into organic acid, so that macromolecular organic matters are decomposed into micromolecular organic matters, and insoluble organic matters are converted into soluble organic matters. The sewage treated in the A pool 3 overflows through an overflow pipe 11 and enters an O pool 4, fresh air is continuously blown into the O pool 4 by adopting a high-efficiency blast blower 26, and aerobic microorganisms are nitrified and CODcr and BOD are removed under the action of aerobic activated sludge₅Meanwhile, a large amount of soluble phosphate can be absorbed and converted into insoluble poly-orthophosphate to be stored in the thalli, the effluent of the O tank 4 overflows to a secondary sedimentation tank 5, the effluent of the 0 tank 4 contains a large amount of activated sludge and fallen biological membranes, so that the secondary sedimentation tank 5 is arranged for separating mud and water to further precipitate fallen biological membranes and small organic and inorganic particles which do not precipitate, and the sludge precipitated by the secondary sedimentation tank 5 is periodically cleaned by a mud-water separator. The effluent of the secondary sedimentation tank 5 is lifted to the micro-ecological filter bed 6 through a sewage pump, a water distribution pipe is arranged above a pre-treatment section 13 of the micro-ecological filter bed, the sewage in the secondary sedimentation tank 5 enters the micro-ecological filter bed 6, and the purification mechanism of the micro-ecological filter bed 6 is as follows: after the wetland system is mature, the surface of the filler and the root system of the plant form a biological film due to the growth of a large number of microorganisms. When the wastewater flows through the biological membrane, a large amount of wastewaterSS is blocked and trapped by the filler and the plant root system. Organic contaminants are removed by absorption, assimilation and catabolism by biofilms. The system is characterized in that the plant root system transfers and releases oxygen, so that the surrounding environment of the plant root system sequentially has aerobic, anoxic and anaerobic states, and nitrogen and phosphorus in the wastewater can be absorbed as nutrients by plants and microorganisms and can be removed by nitrification and denitrification. The effluent of the micro-ecological filter bed 6 flows into a clean water tank 7, and is disinfected by an ultraviolet disinfector, and then the clean water is discharged.

As shown in fig. 4-5, when cleaning the pretreatment tank 1, the outlet of the water collecting tank 8 is closed, so that the water from the water inlet is gathered in the water collecting tank 8, and does not flow into the subsequent process, the cleaner stands on the cleaning platform 24, opens the cleaning door, cleans the impurities on the grating 9 through the cleaning opening 25, after the impurities on the grating 9 are cleaned, opens the fixed structure of the cleaning plate 23, rotates the cleaning plate 23 and the grating plate 22 relatively, extends the sludge pump sludge suction hose 38 into the bottom of the grit chamber 10 through the gap, opens the sludge pump of the sludge-water separator 27 to suck the sludge in the grit chamber 10, sucks the sludge at the bottom of the secondary grit chamber 5, opens the motor of the driving gear 40, controls the push rod to reciprocate in the sludge zone 28 through the power mechanism 31, squeezes the sludge through the sludge inlet pipe 33 into the first sludge outlet 34 and the second sludge outlet 35, and separates the sludge in the squeezing process, the bilge well filtering baffle 32 enters the bilge area 29 and is discharged into the pretreatment tank 1 through the sewage outlet pipe 36, after the sludge is cleaned, the cleaning plate 23 is rotated back to the fixed position and is fixed, the cleaning door is closed, the outlet of the water collecting tank 8 is opened, and the system works normally.

The above description has been made in detail only for the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art, and all such changes are intended to be encompassed by the present invention.

Claims (10)

1. The utility model provides a domestic sewage A/O processing system which characterized in that: the system is of an integrated structure, and the pretreatment tank, the adjusting tank, the A tank, the O tank, the secondary sedimentation tank, the microecological filter bed and the clean water tank are sequentially connected in parallel; the pretreatment tank comprises a water collecting tank, a grid and a grit chamber, the water collecting tank is arranged below the water inlet, the grid is arranged below the water collecting tank, and the grit chamber is arranged below the grid; an opening in the middle of the pretreatment tank is communicated with the regulating tank; the lower part of the regulating tank is communicated with the lower part of the tank A; an overflow pipe is arranged at the upper part of the A tank, an outlet of the overflow pipe is communicated with the O tank, the upper part of the O tank is communicated with a secondary sedimentation tank, the secondary sedimentation tank is communicated with the micro-ecological filter bed through a water distribution pipe, an inlet of the water distribution pipe is arranged at the middle part of the secondary sedimentation tank, and an outlet of the water distribution pipe is arranged above the micro-ecological filter bed; the micro-ecological filter bed comprises a pretreatment section and a layered treatment section, wherein the pretreatment section is provided with a first cobble layer, the layered treatment section is sequentially provided with a soil layer, a gravel layer and a second cobble layer from top to bottom, a masonry is arranged between the pretreatment section and the layered treatment section, a water trough is arranged at the lower part of the masonry and communicates the first cobble layer with the second cobble layer, a water collecting pipe is arranged above the layered treatment section of the micro-ecological filter bed, and an outlet of the water collecting pipe is communicated with a clean water pool; domestic sewage is discharged after passing through the pretreatment tank, the adjusting tank, the A tank, the O tank secondary sedimentation tank, the microecological filter bed and the clean water tank in sequence.

2. The domestic sewage A/O treatment system of claim 1, wherein: the grid includes grid otter board and the board of decontaminating, the grid otter board is the platelike of constituteing by parallel bars, the grid otter board is fixed in the preliminary treatment pond with the board of decontaminating, the grid otter board is connected with the board of decontaminating is articulated.

3. The domestic sewage A/O treatment system of claim 2, wherein: the included angle between the grid mesh plate and the trash removal plate is 150-175 degrees, and the trash removal plate is parallel to the ground.

4. The domestic sewage A/O treatment system of claim 1, wherein: the bottom of the grit chamber is of a quadrangular structure, the area of the bottom surface of the grit chamber is smaller than that of the top surface, and the bottom surface of the grit chamber is positioned under the dirt removing plate.

5. The domestic sewage A/O treatment system of claim 1, wherein: the pretreatment tank is provided with the platform of decontaminating outward, and the pretreatment tank has seted up the mouth of decontaminating near the platform one side of decontaminating, clear dirty board top is gone up to the mouth of decontaminating, clear dirty board below is followed to the mouth of decontaminating, clear dirty mouthful is provided with the door of decontaminating.

6. The domestic sewage A/O treatment system of claim 1, wherein: the grid regularly clears up debris, grit chamber and two heavy ponds regularly clear up bottom of the pool mud.

7. The domestic sewage A/O treatment system of claim 6, wherein: sludge in the grit chamber and the secondary sedimentation tank is recovered by adopting a sludge-water separator, and the sludge-water separator is arranged on the sewage disposal platform; the mud-water separator comprises a sludge area, a sewage area, a push rod and a power mechanism; the sludge area is positioned above the sewage area, a push rod is arranged in the sludge area, and the push rod provides power for reciprocating motion through a power mechanism; a filtering partition plate is arranged between the sludge area and the sewage area; a sludge inlet pipe is arranged in the middle of the top of the sludge area, and a first sludge outlet and a second sludge outlet are symmetrically arranged at the bottom of the sludge area in the motion direction of the push rod; a sewage outlet pipe is arranged in the middle of the bottom of the sewage area; the sludge inlet pipe is communicated with the outlet of the sludge pump, and the inlet of the sludge pump is communicated with the sludge outlet pipe of the secondary sedimentation tank and the sludge suction hose; the sewage outlet pipe extends into the pretreatment tank.

8. The domestic sewage A/O treatment system of claim 1, wherein: and continuously blowing fresh air into the O pool through a blower.

9. The domestic sewage A/O treatment system of claim 1, wherein: the height of cobblestones in the pretreatment section is 1100 mm; the height of a soil layer in the layering treatment section is 300mm, the height of a gravel layer is 200mm, and the height of a cobblestone layer is 600 mm.

10. The domestic sewage A/O treatment system of claim 1, wherein: the walls of the pretreatment tank, the adjusting tank, the tank A, the tank O, the secondary sedimentation tank and the clean water tank are made of carbon steel anti-corrosion materials; the micro-ecological filter bed adopts masonry.

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