CN213012447U - Advanced sewage treatment device - Google Patents

Abstract

The utility model relates to a sewage treatment technical field provides a sewage advanced treatment unit. The device comprises an anaerobic pool, an anoxic pool, an aerobic pool, a sedimentation pool, an advanced treatment pool and a clean water pool which are sequentially communicated, wherein a filter layer is arranged in the advanced treatment pool, the advanced treatment pool is divided into a muddy water area and a clean water area by the filter layer, the muddy water area is communicated with the sedimentation pool, and the clean water area is communicated with the clean water pool; the device comprises a water purification area and a back washing device, wherein the water purification area is used for purifying water and/or water, the back washing device is arranged in the device chamber and is connected with the water purification area, the back washing device is used for providing back washing water and/or back washing gas, and the water outlet direction and/or the gas outlet direction of the back washing device points to the filter layer from the water purification area; the advanced treatment tank is added for further advanced treatment of sewage flowing out of the aerobic tank, and the quality of effluent water is ensured to reach the standard.

Description

Advanced sewage treatment device

Technical Field

The utility model belongs to the technical field of sewage treatment, in particular to sewage advanced treatment unit.

Background

With the improvement of the living standard of people in China, the sewage quantity is also greatly increased. The pollution of sewage to water resources has attracted great attention, and particularly, nitrogen and phosphorus which are important nutrient elements of organisms can cause the problem of water eutrophication after entering water along with sewage. With the further improvement of the environmental protection requirement, the removal of nitrogen and phosphorus in the sewage is more and more emphasized. In the prior art, a biological reaction tank is arranged for sewage treatment, but the water quality of the treated sewage can not meet the standard yet. Therefore, the improvement of the biological reaction tank to carry out advanced treatment on the sewage becomes a technical problem to be solved in the sewage treatment technology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sewage advanced treatment unit carries out advanced treatment to sewage, ensures that water quality of water reaches the standard.

In order to achieve the purpose, the utility model adopts the following technical scheme: a sewage advanced treatment device comprises an anaerobic pool, an anoxic pool, an aerobic pool, a sedimentation pool, an advanced treatment pool and a clean water pool which are sequentially communicated, wherein a filter layer is arranged in the advanced treatment pool and divides the advanced treatment pool into a muddy water area and a clean water area, the muddy water area is communicated with the sedimentation pool, and the clean water area is communicated with the clean water pool; the water purifier is characterized by further comprising an equipment chamber, wherein a back washing device is arranged in the equipment chamber, the back washing device is connected with the water purification area, the back washing device is used for providing back washing water and/or back washing gas, and the water outlet and/or gas outlet direction of the back washing device is pointed to the filter layer by the water purification area.

Optionally, the filter layer is arranged in the middle of the advanced treatment tank, the filter layer comprises a filter material layer, a gravel bearing layer, a filter plate and a filter head from top to bottom, the filter head is arranged between the gravel bearing layer and the filter plate, and a water outlet and/or a gas outlet of the backwashing device is connected to the water purification area.

Optionally, the backwashing device comprises a first water outlet valve, a second water outlet valve, a normally open valve and a backwashing pump, the backwashing pump is connected with the clean water tank through the normally open valve, the backwashing pump is connected with the external environment through the first water outlet valve, and the backwashing pump is connected into the water purification area through the second water outlet valve.

Optionally, the backwashing device further comprises an aeration pump, and the aeration pump is connected to the water purification area.

Optionally, a water inlet valve and a water distributor are further arranged in the advanced treatment tank, the water distributor is connected with the sedimentation tank through the water inlet valve, and the water distributor is arranged at the upper part of the filter layer.

Optionally, the front end in anaerobism pond is provided with the sieve filtering pond, the upper portion in sieve filtering pond is provided with the sieve filter screen cage, the sieve filter screen cage includes upper plate and hypoplastron, the upper plate with the week side correspondence of hypoplastron is connected with the support column, be connected with the sieve filter screen between the support column, be provided with the water inlet on the upper plate, the lower part in sieve filtering pond is the back taper, top-down is provided with the multilayer grid in the sieve filter screen cage, and the multilayer that top-down set up the aperture of grid reduces gradually.

Optionally, a preposed oxygen-poor tank is arranged between the sieve filter tank and the anaerobic tank, a first perforated pipe and a second perforated pipe are correspondingly arranged at the bottoms of the preposed oxygen-poor tank and the anaerobic tank, and the sieve filter tank is correspondingly connected with the first perforated pipe and the second perforated pipe through switch valves.

Optionally, a partition plate is arranged in the sedimentation tank, the partition plate and the bottom wall of the sedimentation tank are arranged in a clearance mode, the partition plate divides the sedimentation tank into a buffer zone and a coagulation zone, the upper portion of the buffer zone is communicated with the aerobic tank, and an inclined pipe is arranged on the upper portion of the coagulation zone.

Optionally, the lower part of the sedimentation tank is in an inverted cone shape.

Optionally, a chemical phosphorus removal agent storage and dosing system, a sodium hypochlorite solution storage and dosing system and a power distribution and automatic control system are further arranged in the equipment room.

Compared with the prior art, the advanced treatment tank is additionally arranged for further advanced treatment of sewage biologically treated by the anaerobic tank, the anoxic tank and the aerobic tank, the filtering layer arranged in the advanced treatment tank filters the sewage, microorganisms can conveniently adhere and grow in the filtering layer, the microorganism community performs nitrogen and phosphorus removal treatment on the sewage passing through the filtering layer, and the treated sewage flows into the clean water tank from the water purification area; after the device runs for a certain time, the filtering layer collects excessive dirt to influence the filtering effect, at the moment, the water purifying area and the clean water pool are in a cut-off communication relationship, then the filtering layer is backwashed by utilizing the clean water in the clean water pool through the backwashing device, the washed dirt stays in the muddy water area, and at the moment, the dirt in the muddy water area can overflow and be discharged to a front-end structure of the device; this application adopts above-mentioned technical scheme to realize the advanced treatment to sewage, ensures that water quality of water reaches the standard.

Drawings

FIG. 1 is a schematic view of an advanced wastewater treatment apparatus provided by an embodiment of the present invention;

FIG. 2 is a schematic view of the deep treatment tank, clean water tank and backwash assembly of FIG. 1;

FIG. 3 is a top view of a screen cage;

fig. 4 is a schematic diagram of the filter plate and the filter head.

Reference numerals:

1. an anaerobic tank; 11. a second perforated pipe; 2. an anoxic tank; 3. an aerobic tank; 4. a sedimentation tank; 401. a buffer area; 402. a coagulation zone; 403. a partition plate; 404. an inclined tube; 5. a deep treatment tank; 51. a filter layer; 52. a muddy water zone; 53. a water purification area; 54. filtering the plate; 55. a filter head; 56. a water inlet valve; 57. a water distributor; 6. a clean water tank; 7. a backwashing device; 71. a first water outlet valve; 72. a water outlet valve II; 73. a normally open valve; 74. a backwash pump; 75. an aeration pump; 8. screening a filter pool; 9. a screen cage; 91. an upper plate; 92. a lower plate; 93. a support pillar; 94. screening a filter screen; 95. a grid; 96. a connecting plate; 97. a pipe joint; 10. a preposed anoxic pond; 101. and (5) perforating the first tube.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are some, but not all embodiments of the invention. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

As shown in fig. 1 and 2, the utility model provides a sewage advanced treatment device, which comprises an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a sedimentation tank 4, an advanced treatment tank 5 and a clean water tank 6 which are sequentially communicated, wherein a filter layer 51 is arranged in the advanced treatment tank 5, the filter layer 51 divides the advanced treatment tank 5 into a muddy water zone 52 and a clean water zone 53, the muddy water zone 52 is communicated with the sedimentation tank 4, and the clean water zone 53 is communicated with the clean water tank 6; the device is characterized by further comprising an equipment chamber, wherein a back washing device 7 is arranged in the equipment chamber, the back washing device 7 is connected with the water purification area 53, the back washing device 7 is used for providing back washing water and/or back washing gas, and the water outlet direction and/or the air outlet direction of the back washing device 7 are/is directed to the filter layer 51 from the water purification area 53.

Compared with the prior art, the advanced treatment tank 5 is additionally arranged for further advanced treatment of sewage biologically treated by the anaerobic tank 1, the anoxic tank 2 and the aerobic tank 3, the filtering layer 51 arranged in the advanced treatment tank 5 filters the sewage, meanwhile, microorganisms are convenient to adhere and grow in the filtering layer 51, the microorganisms in the filtering layer 51 are removed by a microorganism community, and the treated sewage flows into the clean water tank 6 from the clean water area 53; after the device runs for a certain time, the filtering layer 51 collects excessive dirt to influence the filtering effect, at the moment, the water purifying area 53 is in cut-off communication with the clean water tank 6, then the backwashing device 7 is used for backwashing the filtering layer 51 by using the clean water in the clean water tank 6, the washed dirt stays in the muddy water area 52, and at the moment, the dirt in the muddy water area 52 can overflow and be discharged to a front-end structure of the device; this application adopts above-mentioned technical scheme to realize the advanced treatment to sewage, ensures that water quality of water reaches the standard.

According to the anaerobic tank, the anoxic tank 2 and the aerobic tank 3, the suspended soft biological filler is arranged in the anaerobic tank 1, the suspended soft biological filler further increases the microbial biomass of the system, and improves the processing capacity of the system. The biological filler has strong adsorption capacity, is easy to attach with microorganisms, is suitable for the growth of rich biological communities, forms an ecosystem with longer food chains such as bacteria, algae, protozoa, metazoan and the like, and can efficiently degrade organic pollutants, denitrify and dephosphorize; the biological membrane is high, and is high in biological activity and mass transfer efficiency.

In some embodiments, as shown in fig. 2 and 4, the filter layer 51 is disposed in the middle of the advanced treatment tank 5, the filter layer 51 includes, from top to bottom, a filter material layer, a gravel support layer, a filter plate 54, and a filter head 55, the filter head 55 is disposed between the gravel support layer and the filter plate 54, and the water outlet and/or the air outlet of the backwashing device 7 is connected to the clean water zone 53. The sewage enters the upper part of the advanced treatment tank 5 after undergoing biological reaction in the anaerobic tank, the anoxic tank and the aerobic tank, then falls downwards and is filtered by the filter layer 51, the filter layer adopts comet type fiber bundle filter materials to realize high filter speed, high precision filtration and large sewage containing capacity, effectively filters dirt and is convenient for microorganism to adhere and grow, wherein the filter plate 54 is provided with a mounting hole, the filter head 55 is arranged on the filter plate 54, one end of the filter head 55 is positioned in the gravel bearing layer, the other end is positioned in the water purification area 53, the water outlet and/or the gas outlet of the backwashing device 7 is connected into the water purification area 53, and the filter layer 51 is thoroughly cleaned through the filter head 55; the sewage mixed with the backwashing sewage can be overflowed and discharged to a front-end structure of the application.

In some embodiments, as shown in fig. 2, the backwashing device 7 comprises a first outlet valve 71, a second outlet valve 72, a normally open valve 73 and a backwashing pump 74, wherein the backwashing pump 74 is connected with the clean water tank 6 through the normally open valve 73, the backwashing pump 74 is connected with the external environment through the first outlet valve 71, and the backwashing pump 74 is connected into the clean water zone 53 through the second outlet valve 72. Under normal conditions: the first water outlet valve 71 is opened, the second water outlet valve 72 is closed, and the backwashing pump 74 discharges the clean water in the clean water tank 6 to the external environment; if the device is arranged on the ground, the backwashing pump 74 can be not started, and the clean water tank 6 can directly discharge water through the water outlet; under the condition of backwashing: when the first outlet valve 71 is closed, the second outlet valve 72 is closed and opened, and the backwashing pump 74 backwashes the filter layer 51 with the clean water in the clean water tank 6, it should be noted that the communication between the clean water area 53 and the clean water tank 6 should be cut off during the backwashing.

In some embodiments, as shown in fig. 2, the backwashing device 7 further includes an aeration pump 75, and the aeration pump 75 is connected to the water purification zone 53. The aeration pump 75 provides oxygen for the aeration device at the bottom of the aerobic tank 3, and can also provide back washing gas for the filter head 55 through valve switching, and the back washing gas and the back washing water are used together to further enhance the back washing effect of the filter layer 51.

In some embodiments, as shown in fig. 2, a water inlet valve 56 and a water distributor 57 are further disposed in the advanced treatment tank 5, the water distributor 57 is connected to the sedimentation tank 4 through the water inlet valve 56, and the water distributor 57 is disposed at the upper portion of the filter layer 51. Under normal conditions: the water inlet valve 56 is opened, sewage enters the water distributor 57 from the upper part of the sedimentation tank 4, and the sewage is uniformly sprayed onto the filter layer 51 through the water distributor 57, so that the sewage is uniformly filtered by the filter layer 51, the uniform distribution and growth of microorganisms are facilitated, and the sewage treatment effect is further improved; under the condition of backwashing: the inlet valve 56 is closed and the muddy water region 52 progressively accumulates the sewage mixed with backwash sewage and then overflows to the front structure of the application for further treatment.

In some embodiments, as shown in fig. 1 and 3, a sieve filter 8 is disposed at the front end of the anaerobic tank 1, a sieve filter cage 9 is disposed at the upper portion of the sieve filter 8, the sieve filter cage 9 includes an upper plate 91 and a lower plate 92, support pillars 93 are correspondingly connected to the peripheral sides of the upper plate 91 and the lower plate 92, a sieve filter screen 94 is connected between the support pillars 93, a water inlet is disposed on the upper plate 91, the lower portion of the sieve filter 8 is in an inverted cone shape, multiple layers of grids 95 are disposed in the sieve filter cage 9 from top to bottom, and the pore diameters of the multiple layers of grids 95 disposed from top to bottom gradually decrease.

The filtering pond 8 can carry out pre-filtering on dirt such as sand grains, large-particle substances, long fibers and the like, and avoids the influence on the filtering effect of the filtering layer 51 caused by the final gathering of large dirt to the filtering layer 51, the lower ends of four supporting columns 93 are connected with a lower plate 92 at first, connecting plates 96 are arranged on the inner sides of the supporting columns 93, then a plurality of layers of grids 95 are correspondingly connected with the connecting plates 96 by bolts, then a filtering screen 94 is matched with grooves on the supporting columns 93 for installation, and finally the upper plate 91 is connected with the upper ends of the four supporting columns 93; sewage enters the screen mesh cage 9 from the pipe joint 97 and flows from top to bottom, dirt is intercepted by different grids 95 from top to bottom from large to small, the dirt can be dispersed onto the multiple layers of grids 95, the dirt cannot be gathered at the bottom of the screen mesh cage 9, the screen mesh 94 cannot be blocked by the dirt, and the screening effect is prevented from being influenced; dismantle the time with upper plate 91 and wherein one side sieve filter screen 94 demolish, can correspond and collect the filth on the different grids 95, so be convenient for categorised the filth is handled.

In some embodiments, as shown in fig. 1, a pre-anoxic tank 10 is disposed between the sieve filter 8 and the anaerobic tank 1, a first perforated pipe 101 and a second perforated pipe 11 are disposed at the bottoms of the pre-anoxic tank 10 and the anaerobic tank 1, and the sieve filter 8 is correspondingly connected to the first perforated pipe 101 and the second perforated pipe 11 through a switch valve. The front anoxic tank 10 is arranged, so that the purpose of distributing carbon sources can be achieved, the amount of nitrate entering the anaerobic tank 4 is reduced, and the dephosphorization efficiency is improved; the sewage can independently enter the preposed anoxic tank 10 through the switch valve by the screening tank 8, can independently enter the anaerobic tank 1 through the switch valve by the screening tank 8, and can simultaneously enter the preposed anoxic tank 10 and the anaerobic tank 1 through the switch valve, so that carbon sources are reasonably distributed for the preposed anoxic tank 10 and the anaerobic tank 1, and the nitrogen and phosphorus removal effect is adjusted; wherein the mixing effect of sewage in the cell body can be improved to perforated pipe one 101 and perforated pipe two 11, and the sewage top-down in the screening pond 8 flows into the perforated pipe and upwards flows out from the perforated pipe again, can play the effect of stirring, increases the homogeneity of sewage, promotes biological reaction reinforcing sewage treatment effect, has avoided simultaneously adopting agitating unit, further reduction the power consumption.

Wherein can set up the mud backwash pump in the sedimentation tank 4, the mud backwash pump can be connected with the perforated pipe and be used for backward flow mud, promotes backward flow mud and sewage mixing effect through the perforated pipe. Also can set up the perforated pipe in the bottom in oxygen deficiency pond 2, be provided with mixed liquid backwash pump in the good oxygen pond 3, mixed liquid backwash pump is connected with the perforated pipe in the oxygen deficiency pond 2, so can promote the mixed liquid of backward flow and the mixed effect of sewage.

In some embodiments, as shown in fig. 1, a partition 403 is disposed in the sedimentation tank 4, the partition 403 is disposed at a gap with the bottom wall of the sedimentation tank 4, the partition 403 divides the sedimentation tank 4 into a buffer zone 401 and a coagulation zone 402, the upper part of the buffer zone 401 is communicated with the aerobic tank 3, and the upper part of the coagulation zone 402 is provided with an inclined pipe 404. Sewage enters the upper part of the buffer zone 401 from the aerobic tank 3 and then flows from top to bottom, then the sewage enters the coagulation zone 402 and flows from bottom to top, sludge is prevented by the inclined pipe 404 from precipitating, and finally the sludge is precipitated to the bottom of the sedimentation tank 4.

In some embodiments, as shown in fig. 1, the lower portion of the sedimentation tank 4 is inverted cone-shaped to facilitate sludge accumulation.

In some embodiments, a chemical phosphorus removal agent storage and dosing system, a sodium hypochlorite solution storage and dosing system and a power distribution and automatic control system are further arranged in the equipment room. The chemical phosphorus removal agent storage and addition system can be connected with the aerobic tank 3, so that the phosphorus removal effect is enhanced; the sodium hypochlorite solution storage and adding system can be connected with the clean water tank 6 and is used for disinfecting and sterilizing water; the power distribution and control system comprises a power distribution system and a data uploading communication module.

The power distribution system supplies power to the electric equipment in the device, and the system comprises power distribution protection matched with the power equipment, wherein the power distribution protection comprises short circuit, open circuit, overload, overvoltage and undervoltage protection. The device also has surge protection, electromagnetic anti-interference protection and automatic heat dissipation protection devices. The power distribution adopts the most advanced bus backboard connection mode or the traditional direct connection mode, and adopts the fool-proof design, thereby saving time, being convenient and preventing mistakes. The data uploading communication module is an integrated product of a controller and a communication module, and comprises a PLC (programmable logic controller), a singlechip or an ARM (advanced RISC machines) control board and other programmable controllers, including a touch screen (HMI) + the programmable controllers or an independent controller. The data uploading communication module uploads and receives data communication by using a GPRS (general packet radio service) or 4G/5G communication technology or other communication modes. The data uploading communication module has the following functions: collecting the parameters of electric equipment and other running states in the device; uploading the collected equipment operation parameters to a monitoring platform; and receiving an instruction sent by the monitoring platform, and adjusting the running state of the equipment.

The utility model provides a sieve filtering pond 8, leading oxygen deficiency pond 10, anaerobism pond 1, oxygen deficiency pond 2, good oxygen pond 3, sedimentation tank 4, deep treatment pond 5, clean water basin 6 and the whole shaping of equipment room are a box, and when this application device was used for cold area's outdoor on the ground, the equipment box outside should set up the heat preservation insulating layer, and the box is weather resistant steel box respectively (including interior outer anticorrosive coating), heat preservation insulating layer, flat steel plate shell (including interior outer anticorrosive coating) from interior to exterior structure. The heat insulation layer adopts a polyurethane foaming spraying process, the spraying density is 40kg/m3, the conventional spraying thickness is 50mm, and the maximum design thickness can be 130mm according to the environmental requirements of different regions. The equipment box body provided with the heat insulation layer can effectively reduce the heat loss of the sewage and maintain the higher temperature of the sewage, thereby ensuring the treatment effect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a sewage advanced treatment unit which characterized in that: the device comprises an anaerobic pool (1), an anoxic pool (2), an aerobic pool (3), a sedimentation pool (4), an advanced treatment pool (5) and a clean water pool (6) which are sequentially communicated, wherein a filter layer (51) is arranged in the advanced treatment pool (5), the advanced treatment pool (5) is divided into a muddy water area (52) and a clean water area (53) by the filter layer (51), the muddy water area (52) is communicated with the sedimentation pool (4), and the clean water area (53) is communicated with the clean water pool (6); still include the equipment room, be provided with back flush unit (7) in the equipment room, back flush unit (7) with water purification district (53) is connected, back flush unit (7) are used for providing back flush water and/or back flush gas, the play water of back flush unit (7) and/or the direction of giving vent to anger by water purification district (53) point to filter layer (51).

2. The advanced wastewater treatment plant according to claim 1, characterized in that: the filtering layer (51) is arranged in the middle of the deep treatment pool (5), the filtering layer (51) comprises a filtering material layer, a gravel bearing layer, a filtering plate (54) and a filtering head (55) from top to bottom, the filtering head (55) is arranged between the gravel bearing layer and the filtering plate (54), and a water outlet and/or a gas outlet of the backwashing device (7) are/is connected into the water purification area (53).

3. The advanced wastewater treatment plant according to claim 2, characterized in that: the backwashing device (7) comprises a first water outlet valve (71), a second water outlet valve (72), a normally open valve (73) and a backwashing pump (74), wherein the backwashing pump (74) is connected with the clean water tank (6) through the normally open valve (73), the backwashing pump (74) is connected with the external environment through the first water outlet valve (71), and the backwashing pump (74) is connected into the water purifying area (53) through the second water outlet valve (72).

4. The advanced wastewater treatment plant according to claim 3, characterized in that: the backwashing device (7) further comprises an aeration pump (75), and the aeration pump (75) is connected to the water purification area (53).

5. The advanced wastewater treatment plant according to claim 2, characterized in that: the advanced treatment tank (5) is also internally provided with a water inlet valve (56) and a water distributor (57), the water distributor (57) is connected with the sedimentation tank (4) through the water inlet valve (56), and the water distributor (57) is arranged at the upper part of the filtering layer (51).

6. The advanced wastewater treatment plant according to claim 1, characterized in that: the front end in anaerobism pond (1) is provided with sieve filtering pond (8), the upper portion in sieve filtering pond (8) is provided with sieve filter screen cage (9), sieve filter screen cage (9) are including upper plate (91) and hypoplastron (92), upper plate (91) with week side correspondence of hypoplastron (92) is connected with support column (93), be connected with sieve filter screen (94) between support column (93), be provided with the water inlet on upper plate (91), the lower part in sieve filtering pond (8) is the back taper, top-down is provided with multilayer grid (95) in sieve filter screen cage (9), and the multilayer that top-down set up the aperture of grid (95) reduces gradually.

7. The advanced wastewater treatment plant according to claim 6, characterized in that: sieve filtering pond (8) with be provided with leading oxygen deficiency pond (10) between anaerobism pond (1), leading oxygen deficiency pond (10) with the bottom correspondence in anaerobism pond (1) is provided with perforated pipe (101) and perforated pipe two (11), sieve filtering pond (8) through the ooff valve correspond with perforated pipe one (101) with perforated pipe two (11) are connected.

8. The advanced wastewater treatment plant according to claim 1, characterized in that: be provided with baffle (403) in sedimentation tank (4), baffle (403) with the diapire clearance of sedimentation tank (4) sets up, baffle (403) will sedimentation tank (4) are separated for buffer zone (401) and coagulation zone (402), the upper portion of buffer zone (401) with good oxygen pond (3) intercommunication, the upper portion of coagulation zone (402) is provided with pipe chute (404).

9. The advanced wastewater treatment plant according to claim 8, characterized in that: the lower part of the sedimentation tank (4) is in an inverted cone shape.

10. The advanced wastewater treatment plant according to claim 1, characterized in that: and a chemical phosphorus removal agent storage and adding system, a sodium hypochlorite solution storage and adding system and a power distribution and automatic control system are also arranged in the equipment room.

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