CN214115177U

CN214115177U - Coagulating sedimentation dephosphorization system

Info

Publication number: CN214115177U
Application number: CN202023044168.2U
Authority: CN
Inventors: 肖宇轩; 肖冬杰; 高新; 田黎黎; 戴宇霆
Original assignee: Hunan Junxin Environmental Co ltd
Current assignee: Hunan Junxin Environmental Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-09-03
Anticipated expiration: 2030-12-16

Abstract

The utility model discloses a coagulating sedimentation dephosphorization system, this system is including adding sour device, add alkali device, the phosphorus removal agent is thrown the feeder apparatus, the flocculating agent is thrown the feeder apparatus and is linked together the temperature regulation district that communicates in proper order, the phosphorus removal reaction zone, flocculation district and natural settling zone, add sour device, add alkali device respectively with temperature regulation district intercommunication, the temperature regulation district is equipped with cooling coil, the thermometer, pH meter and water inlet, the phosphorus removal agent is thrown the feeder apparatus and is linked together with phosphorus removal reaction zone, phosphorus removal reaction zone is equipped with first mixer and is used for adjusting the volumetric first liftable baffle in phosphorus removal reaction zone, the flocculating agent is thrown the feeder apparatus and is linked together with flocculation district, the flocculation district is equipped with the second mixer and is used for adjusting the volumetric second liftable baffle in flocculation district. The utility model discloses a system can be accurate control water pH value, temperature, churning time, settling time simultaneously, add the isoparametric of medicine concentration, improves dephosphorization efficiency, and reduce cost avoids the medicament extravagant.

Description

Coagulating sedimentation dephosphorization system

Technical Field

The utility model relates to a dephosphorization system, concretely relates to coagulating sedimentation dephosphorization system.

Background

Along with the increase of the phosphorus content in the water body, the nutrient substance load of the water body is also increased, thereby causing the abnormal propagation of algae and aquatic plants in the water body, namely the eutrophication of the water body. In the existing multiple phosphorus removal methods, the coagulation sedimentation chemical phosphorus removal is mainly characterized in that an inorganic metal salt reagent is added into a water body to react with soluble phosphate in sewage to generate granular and insoluble substances, and then a flocculating agent is added to aggregate fine particles generated in the phosphorus removal reaction process and naturally settle, so that phosphorus and water are thoroughly separated, and the content of phosphorus in the sewage is reduced.

In the chemical phosphorus removal reaction process, parameters such as medicament concentration, reaction environment pH, temperature, stirring time and the like all have important influence on the reaction. Chinese patent publication No. CN209052496U discloses a coagulation reaction device applied to chemical phosphorus removal, which comprises a reflux pump, a water inlet, a pH regulator inlet, a reflux port, a rapid stirrer, a phosphorus removal agent inlet, a flocculant inlet, a slow stirrer, a water outlet, a reaction box and a flocculation box, wherein the reaction box and the flocculation box are separated by a partition plate, the lower part of the reaction box is communicated, sewage directly enters the reaction box for reaction and flows into the flocculation box through the lower end of the reaction box for sedimentation, the pH regulator inlet is arranged on the reaction box, and the flocculation box, the water outlet, the reflux pump, the reflux port and the reaction box are sequentially connected to form reflux so as to improve the overall phosphorus removal efficiency of the coagulation device. However, the device does not relate to how to regulate and control reaction parameters such as medicament adding amount, reaction temperature, stirring time, settling time and the like, so that the defects that the medicament adding amount is not easy to control, other reaction parameters cannot be controlled and the like are caused, the dephosphorization efficiency cannot be effectively improved, and a large amount of labor cost needs to be invested.

Chinese patent document with publication number CN207330574U discloses an integrated chemical phosphorus removal device, which comprises a box body, a dosing system, a stirring system, a dosing system, a liquid medicine mixing system, a water pipe winding system and a control system, the dosing system comprises a plurality of medicine dosing boxes, the medicine dosing boxes are provided with a medicine metering pump and a flowmeter, the medicine metering pump is used for controlling the addition amount of the medicine, the flowmeter is used for controlling the addition amount of the water, the stirring system comprises a plurality of stirring barrels, the dosing system comprises a plurality of medicine dosing boxes, the liquid medicine mixing system comprises a plurality of mixers, a sewage inlet and a water outlet, the mixers are respectively communicated with the corresponding medicine dosing boxes through the medicine dosing pumps, the water pipe winding system comprises a hose and a winding column, the control system is connected with the dosing system, the stirring system, the dosing system, the liquid medicine mixing system and the water pipe winding system. The patent application mainly emphasizes the automatic configuration of the medicament, the step-by-step feeding of the medicament and the step-by-step reaction. Sewage enters a mixer of a liquid medicine mixing system, a medicine enters the mixer after being automatically dispensed by a medicine dispensing system, the liquid medicine is sent to the next mixer after being mixed and reacted, and another medicine is added for reaction, so that the purposes of adding the medicine step by step and reacting step by step are achieved. However, the patent application still does not relate to how to comprehensively regulate and control reaction parameters such as reaction temperature, reaction pH, stirring time, settling time and the like by using a device, so that the reaction parameters cannot be controlled, and the phosphorus removal efficiency cannot be effectively improved.

In conclusion, the existing chemical phosphorus removal device does not effectively control the medicament addition, the reaction temperature, the reaction pH, the medicament and water stirring and mixing time, the solid-liquid settling separation time and the like, so that the problems of high medicament cost, high labor cost, low chemical phosphorus removal efficiency and the like are caused.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome prior art not enough, thereby in the chemical dephosphorization process of coagulating sedimentation to current sewage very much, thereby the addition of dephosphorization agent and flocculating agent, stirring reaction and speed, settling time, reaction pH, thereby reaction temperature isoparametric can not make the technical problem that dephosphorization is efficient simultaneously accurate control, thereby provide one kind can be simultaneously accurate control water pH value, the temperature, the stirring time, settling time, add medicine concentration isoparametric, improve dephosphorization efficiency, reduce cost, avoid the extravagant coagulating sedimentation dephosphorization system of medicament.

In order to solve the technical problem, the utility model adopts the following technical scheme.

The utility model provides a coagulating sedimentation dephosphorization system, includes that acidification device, alkali adding device, phosphorus removal agent throw feeder apparatus, flocculating agent throw feeder apparatus and temperature regulation district, dephosphorization reaction zone, flocculation district and the natural settling zone that communicate in proper order, acidification device the alkali adding device respectively with temperature regulation district intercommunication, temperature regulation district is equipped with cooling coil, thermometer, pH meter and water inlet, phosphorus removal agent throw feeder apparatus with dephosphorization reaction zone intercommunication, dephosphorization reaction zone is equipped with first mixer and is used for adjusting the first liftable baffle of dephosphorization reaction zone volume, flocculating agent throw feeder apparatus with flocculation district intercommunication, flocculation district is equipped with the second mixer and is used for adjusting the second liftable baffle of flocculation district volume.

As a further improvement of the technical scheme, the water inlet is communicated with a water inlet pipe, and a water inlet pump is arranged on the water inlet pipe.

As a further improvement of the above technical scheme, the acid adding device comprises an acid tank and an acid adding pipe, the acid adding pipe is provided with an acid adding pump, the acid tank passes through the acid adding pipe and is communicated with the water inlet pipe, the alkali adding device comprises an alkali tank and an alkali adding pipe, the alkali adding pipe is provided with an alkali adding pump, the alkali tank passes through the alkali adding pipe and is communicated with the water inlet pipe, the phosphorus removing agent adding device comprises a phosphorus removing agent preparing box and a phosphorus removing agent conveying pipe, the phosphorus removing agent conveying pipe is provided with a phosphorus removing agent adding pump, the phosphorus removing agent preparing box passes through the phosphorus removing agent conveying pipe and is communicated with the phosphorus removing reaction zone, the flocculant adding device comprises a flocculant preparing box and a flocculant conveying pipe, the flocculant conveying pipe is provided with a flocculant adding pump, and the flocculant preparing box passes through the flocculant conveying pipe and is communicated with the flocculation zone.

As a further improvement of the technical scheme, the outlet of the cooling coil is communicated with the inlet of the cooling coil sequentially through a cooling tower and a cooling water pump.

As a further improvement of the technical scheme, the natural settling area is provided with a water outlet and a sludge discharge port, the water outlet is communicated with the water inlet pipe through a backflow pipeline, and the backflow pipeline is provided with a backflow pump.

As a further improvement of the technical scheme, the temperature regulation zone and the phosphorus removal reaction zone share a first common wall, the phosphorus removal reaction zone and the flocculation zone share a second common wall, and the flocculation zone and the natural settling zone share a third common wall.

As a further improvement of the above technical solution, the first liftable baffle is disposed on the second common wall, and the second liftable baffle is disposed on the third common wall.

As a further improvement of the above technical solution, the rotation speed of the first agitator is greater than the rotation speed of the second agitator.

As a further improvement of the above technical solution, the system further includes a PLC control device, the water inlet pump, the first stirrer, the second stirrer, the phosphorus removing agent adding pump, the flocculant adding pump, the pH meter, the acid adding pump, the alkali adding pump, the thermometer, and the cooling water pump are respectively connected to the PLC control device, wherein the first stirrer, the second stirrer, the phosphorus removing agent adding pump, the flocculant adding pump are respectively linked to the water inlet pump, the acid adding pump and the alkali adding pump are respectively linked to the pH meter, and the cooling water pump is linked to the thermometer.

Compared with the prior art, the utility model has the advantages of:

1. the utility model discloses can accurate control water pH value, temperature, stirring speed and time, settling time, add reaction parameter such as medicine concentration, effectively improve dephosphorization efficiency, reduce the regulation and control cost, avoid the medicament extravagant simultaneously.

2. This novel accessible PLC controlling means of implementation carries out automation, accurate control dephosphorization reaction parameter, can further reduce the cost of labor, improves medicament utilization ratio, simplifies the technology.

Drawings

Fig. 1 is a schematic structural diagram of a system for phosphorus removal by coagulating sedimentation according to embodiment 1 of the present invention.

Fig. 2 is a schematic view of the structural principle of the PLC control device according to embodiment 1 of the present invention.

Illustration of the drawings:

1. an acid tank; 2. an alkali tank; 3. a phosphorus removing agent preparation box; 4. a flocculant preparation box; 5. adding an acid pump; 6. adding an alkali pump; 7. a phosphorus removing agent feeding pump; 8. a flocculating agent adding pump; 9. a water inlet; 10. a pH meter; 11. a thermometer; 12. a temperature regulation zone; 13. a cooling coil; 15. a phosphorus removal reaction zone; 16. a first mixer; 17. a second mixer; 19. a flocculation zone; 20. a natural settling zone; 21. a water outlet; 22. a return line; 23. a sludge discharge port; 24. a reflux pump; 25. a first liftable baffle; 26. a second liftable baffle; 27. a first common wall; 28. a second common wall; 29. a third common wall; 30. a water inlet pipe; 31. adding an acid pipe; 32. adding an alkali tube; 33. a dephosphorizing agent conveying pipe; 34. a flocculant conveying pipe; 35. a water inlet pump; 36. a cooling water pump; 37. and (5) cooling the tower.

Detailed Description

The invention will be further described with reference to the drawings and specific preferred embodiments without limiting the scope of the invention.

Example 1:

the utility model discloses a coagulating sedimentation dephosphorization system, as shown in figure 1 and figure 2, including adding sour device, add alkali device, the phosphorus removal agent is thrown the feeder apparatus, the flocculating agent is thrown feeder apparatus and is linked together the integrative temperature regulation district 12 of formation in proper order, phosphorus removal reaction zone 15, flocculation district 19 and natural settling zone 20, add sour device, it communicates with temperature regulation district 12 respectively to add alkali device, temperature regulation district 12 is equipped with cooling coil 13, thermometer 11, pH meter 10 and water inlet 9, phosphorus removal agent is thrown feeder apparatus and phosphorus removal reaction zone 15 and is linked together, phosphorus removal reaction zone 15 is equipped with first mixer 16 and is used for adjusting the volumetric first liftable baffle 25 in phosphorus removal reaction zone, the flocculating agent is thrown feeder apparatus and flocculation district 19 intercommunication, flocculation district 19 is equipped with second mixer 17 and is used for adjusting the volumetric second liftable baffle 26 in flocculation district.

In the phosphorus removal system, the acid adding device, the alkali adding device, the phosphorus removal agent adding device and the flocculating agent adding device are mainly used for configuring, storing and adding medicaments. The acid mainly adopts hydrochloric acid, the alkali mainly adopts liquid alkali, and the phosphorus removing agent is mainly prepared into a phosphorus removing agent solution (also called a medicament) with the mass fraction of 0.3 percent, namely 1000g of water is added to dissolve 3g of phosphorus removing agent. The temperature adjusting zone 12 reflects the temperature and the pH value of the water body in real time through a thermometer 11 and a pH meter 10, then adjusts the temperature through a cooling coil 13, and adjusts the pH value through an acid adding device and a base adding device. The phosphorus removing agent reaction zone 15 mainly functions to control the adding concentration of the phosphorus removing agent in the water body by adding the medicine flow. The medicine adding flow rate is adjusted according to the water inlet flow rate so as to add the medicine with the specified concentration. Drug addition concentration (drug concentration/addition flow rate)/water inflow rate. For example, the inflow rate is 20m³H, addition flow rate of 1m³And h, when the medicine concentration is three thousandths, the medicine adding concentration is 0.003 to 1/20 to 0.00015 to 150 ppm. After the agent is added, the mixture is quickly stirred to uniformly mix the phosphorus removing agent and the water. The flocculation area 19 is mainly used for adding a flocculating agent, uniformly mixing the flocculating agent with a water body through slow stirring, gathering pollutants generated by power-assisted reaction to form large alum flocs, and the dispensing and dosing principle is consistent with that of the phosphorus removing agent. The main function of the natural settling zone 20 is to settle the flocculated contaminants naturally. The first lifting baffle 25 and the second lifting baffle 26 are baffles which can move up and down, the volume of the phosphorus removal reaction zone 15 and the volume of the flocculation zone 19 are changed by the up-and-down movement of the baffles, so that the hydraulic retention time of the phosphorus removal reaction zone 15 and the flocculation zone 19 is changed, the function of adjusting the stirring time is achieved, the retention time of the phosphorus removal reaction zone 15 (fast stirring zone) is controlled to be 30-60s, and the retention time of the flocculation zone 19 (slow stirring zone) is controlled to be 10-15 min.

In this embodiment, the water inlet 9 is communicated with a water inlet pipe 30, and the water inlet pipe 30 is provided with a water inlet pump 35. The main effect of inlet tube 30 is for intaking and the regulation of pH, and sewage is carried through inlet tube 30 under the effect of intake pump 35, and pH adjusts mainly to adjust through throwing with acid or alkali, and the torrent misce bene through water is about to add the acid plant, add alkali device and inlet tube 30 (the preferred inlet pipe section that is close to water inlet 9) intercommunication, carries out the pH regulation of water through adding acid or adding alkali.

In the embodiment, the acid adding device comprises an acid tank 1 and an acid adding pipe 31, the acid adding pipe 31 is provided with an acid adding pump 5, the acid tank 1 is communicated with a water inlet pipe 30 through the acid adding pipe 31, the alkali adding device comprises an alkali tank 2 and an alkali adding pipe 32, the alkali adding pipe 32 is provided with an alkali adding pump 6, the alkali tank 2 is communicated with the water inlet pipe 30 through the alkali adding pipe 32, the phosphorus removing agent adding device comprises a phosphorus removing agent preparation box 3 and a phosphorus removing agent conveying pipe 33, the phosphorus removing agent conveying pipe 33 is provided with a phosphorus removing agent adding pump 7, the phosphorus removing agent preparation box 3 is communicated with a phosphorus removing reaction zone 15 through the phosphorus removing agent conveying pipe 33, the flocculant adding device comprises a flocculant preparation box 4 and a flocculant conveying pipe 34, the flocculant conveying pipe 34 is provided with a flocculant adding pump 8, and the flocculant preparation box 4 is communicated with a flocculation zone 19 through the flocculant conveying pipe 34. The acid adding pump 5, the alkali adding pump 6, the phosphorus removing agent adding pump 7 and the flocculating agent adding pump 8 all adopt metering pumps, and the dosage can be adjusted at any time.

In this embodiment, the outlet of the cooling coil 13 is sequentially communicated with the inlet of the cooling coil 13 through a cooling tower 37 and a cooling water pump 36, and is used for conveying cooling water to the cooling coil to adjust the temperature of the water in the temperature adjusting area 12.

In this embodiment, the natural settling area 20 is provided with a water outlet 21 and a sludge discharge port 23, the water outlet 21 is communicated with the water inlet pipe 30 through a return pipe 22, and the return pipe 22 is provided with a return pump 24. The main function of the backflow pipeline 22 is to perform water outflow backflow, buffer the concentration of water inflow pollutants and increase the treatment efficiency of the coagulation system.

In this embodiment, the temperature adjusting zone 12 and the phosphorus removal reaction zone 15 share a first common wall 27, the phosphorus removal reaction zone 15 and the flocculation zone 19 share a second common wall 28, and the flocculation zone 19 and the natural settling zone 20 share a third common wall 29. More specifically, the temperature adjusting zone 12, the phosphorus removal reaction zone 15, the flocculation zone 19 and the natural settling zone 20 are all enclosed by a bottom wall and a side wall, and the top is open.

In this embodiment, the first liftable baffle 25 is disposed on the second common wall 28, and the second liftable baffle 26 is disposed on the third common wall 29. More specifically, the first liftable baffle 25 is arranged on the left side of the second common wall 28, the second liftable baffle 26 is arranged on the left side of the third common wall 29, the position of the first liftable baffle 25 on the second common wall 28 is a position for controlling the hydraulic retention time of the dephosphorization reaction zone 15 to be 30-60s, and the position of the second liftable baffle 26 on the third common wall 29 is a position for controlling the hydraulic retention time of the flocculation zone 19 to be 10-15 min.

In this embodiment, the rotation speed of the first stirring machine 16 is higher than that of the second stirring machine 17, the rotation speed of the first stirring machine 16 is usually 300r/min to 600r/min, and the rotation speed of the second stirring machine 17 is usually 80r/min to 100 r/min.

In this embodiment, as shown in fig. 2, the system further includes a PLC control device, and the water inlet pump 35, the first stirrer 16, the second stirrer 17, the phosphorus removing agent adding pump 7, the flocculant adding pump 8, the pH meter 10, the acid adding pump 5, the alkali adding pump 6, the thermometer 11, and the cooling water pump 36 are respectively connected to the PLC control device. Wherein, the linkage relation is as follows:

the first stirrer 16, the second stirrer 17, the phosphorus removing agent adding pump 7 and the flocculating agent adding pump 8 are respectively in linkage control with the water inlet pump 35, namely when the water inlet pump 35 is started, the first stirrer 16, the second stirrer 17, the phosphorus removing agent adding pump 7 and the flocculating agent adding pump 8 are started, and when the water inlet pump 35 is stopped, the first stirrer 16, the second stirrer 17, the phosphorus removing agent adding pump 7 and the flocculating agent adding pump 8 are stopped.

The acid adding pump 5 and the alkali adding pump 6 are respectively controlled by the pH meter 10 in a linkage manner, the pH value measured by the pH meter 10 is P, when P is less than 7, the alkali adding pump 6 is started, the acid adding pump 5 is closed, when P is more than or equal to 7.5, the alkali adding pump 6 is closed, the acid adding pump 5 is started, when P is more than or equal to 7 and less than 7.5, the alkali adding pump 6 is closed, the acid adding pump 5 is closed, namely the pH value of inlet water is adjusted to 7-7.5 through the acid adding pump 5 and the alkali adding pump 6.

The cooling water pump 36 and the thermometer 11 are controlled in a linkage manner, when the temperature measured by the thermometer 11 is higher than 25 ℃, the cooling water pump 36 starts to work, cooling water is introduced into the cooling coil 13 to cool the water to be treated, and when the temperature measured by the thermometer 11 is lower than or equal to 25 ℃, the cooling water pump 36 stops working.

The working principle of the coagulating sedimentation phosphorus removal system of the embodiment is as follows:

the sewage is fed into the temperature adjusting area 12 through the water inlet pipe 30 under the action of the water inlet pump 35, and the pH meter 10 and the thermometer 11 are arranged in the temperature adjusting area 12 and used for observing the pH value and the temperature of the sewage. When the pH value of the sewage is not in the range of 7-7.5, acid or alkali is respectively sent to the water inlet pipe 30 through the acid adding device or the alkali adding device, the pH value of the sewage is adjusted to 7-7.5, and the sewage after pH adjustment enters the temperature adjusting area 12. When the temperature of the sewage in the temperature adjusting area 12 is more than 25 ℃, the temperature of the sewage is controlled below 25 ℃ through the cooling coil 13. The sewage with the adjusted pH value and temperature enters a phosphorus removal reaction zone 15, a phosphorus removal agent preparation box 4 feeds a prepared phosphorus removal agent solution into the phosphorus removal reaction zone 15 through a phosphorus removal agent conveying pipe 33, the mixture is stirred through a first stirrer 16, the rotating speed of the first stirrer 16 is controlled at 600r/min, the phosphorus removal agent and the sewage are rapidly and uniformly mixed and react, the sewage after the reaction enters a flocculation zone 19 through the top of a second common wall 28 (specifically the top of a first liftable baffle 25), a flocculating agent in the flocculating agent preparation box 4 is fed into the flocculation zone 19 through a flocculating agent conveying pipe 34, the mixture is stirred through a second stirrer 17, the rotating speed of the second stirrer 17 is controlled at 80-100r/min, pollutants are agglomerated, and the sewage enters a natural settling zone through the top of a third common wall 29 (specifically the top of a second liftable baffle 26). The first liftable baffle 25 and the second liftable baffle 26 can change the volume of the dephosphorization reaction zone 15 and the flocculation zone 19 by moving up and down, so that the hydraulic retention time is changed, the function of adjusting the stirring time is achieved, the retention time of the dephosphorization reaction zone 15 is controlled to be 30-60s, and the retention time of the flocculation zone 19 is controlled to be 10-15 min. The sewage enters a natural settling zone 20, the settling time is controlled to be 30-40min, flocculated pollutants settle to the bottom through gravity and are discharged through a sludge discharge port 23, supernatant is discharged through a water outlet 21, and partial effluent flows back to the front end through a return pipeline 22 to be reprocessed, mainly for buffering the concentration of the pollutants and prolonging the treatment time and increasing the pollutant removal efficiency. The working process can be automatically controlled through a PLC control system, so that the first stirrer 16, the second stirrer 17, the phosphorus removing agent adding pump 7 and the flocculating agent adding pump 8 are respectively in linkage control with the water inlet pump 35, the acid adding pump 5 and the alkali adding pump 6 are respectively in linkage control with the pH meter 10, and the cooling water pump 36 is in linkage control with the thermometer 11.

The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All belong to the technical scheme under the thinking of the utility model discloses a protection scope. It should be noted that modifications and embellishments without departing from the principles of the present invention may occur to those skilled in the art, and are also considered to be within the scope of the present invention.

Claims

1. The utility model provides a coagulating sedimentation dephosphorization system, its characterized in that, including acidification device, alkali adding device, phosphorus removal agent dosing unit, flocculating agent dosing unit and temperature regulation district (12), dephosphorization reaction zone (15), flocculation district (19) and natural settling zone (20) that communicate in proper order, acidification device alkali adding device respectively with temperature regulation district (12) intercommunication, temperature regulation district (12) are equipped with cooling coil (13), thermometer (11), pH meter (10) and water inlet (9), phosphorus removal agent dosing unit with dephosphorization reaction zone (15) intercommunication, dephosphorization reaction zone (15) are equipped with first mixer (16) and are used for adjusting first liftable baffle (25) of dephosphorization reaction zone (15) volume, flocculating agent dosing unit with flocculation district (19) intercommunication, flocculation district (19) are equipped with second mixer (17) and are used for adjusting second baffle (26) of flocculation district (19) volume .

2. The system for dephosphorization according to claim 1, wherein the water inlet (9) is communicated with a water inlet pipe (30), and a water inlet pump (35) is arranged on the water inlet pipe (30).

3. The system of claim 2, wherein the acid adding device comprises an acid tank (1) and an acid adding pipe (31), the acid adding pipe (31) is provided with an acid adding pump (5), the acid tank (1) is communicated with the water inlet pipe (30) through the acid adding pipe (31), the alkali adding device comprises an alkali tank (2) and an alkali adding pipe (32), the alkali adding pipe (32) is provided with an alkali adding pump (6), the alkali tank (2) is communicated with the water inlet pipe (30) through the alkali adding pipe (32), the phosphorus removing agent adding device comprises a phosphorus removing agent preparing box (3) and a phosphorus removing agent conveying pipe (33), the phosphorus removing agent conveying pipe (33) is provided with a phosphorus removing agent adding pump (7), the phosphorus removing agent preparing box (3) is communicated with the phosphorus removing reaction zone (15) through the phosphorus removing agent conveying pipe (33), and the flocculating agent adding device comprises a preparing box (4) and a flocculating agent conveying pipe (34), and a flocculating agent adding pump (8) is arranged on the flocculating agent conveying pipe (34), and the flocculating agent preparation box (4) is communicated with the flocculation area (19) through the flocculating agent conveying pipe (34).

4. The system for removing phosphorus through coagulating sedimentation according to claim 3, wherein the outlet of the cooling coil (13) is communicated with the inlet of the cooling coil (13) through a cooling tower (37) and a cooling water pump (36) in sequence.

5. The system for removing phosphorus through coagulating sedimentation according to claim 4, wherein the natural sedimentation zone (20) is provided with a water outlet (21) and a sludge discharge port (23), the water outlet (21) is communicated with the water inlet pipe (30) through a return pipe (22), and the return pipe (22) is provided with a return pump (24).

6. The system of claim 4, wherein the temperature regulation zone (12) shares a first common wall (27) with the phosphorus removal reaction zone (15), the phosphorus removal reaction zone (15) shares a second common wall (28) with the flocculation zone (19), and the flocculation zone (19) shares a third common wall (29) with the natural settling zone (20).

7. The system of claim 6, wherein the first liftable baffle (25) is disposed on the second common wall (28), and the second liftable baffle (26) is disposed on the third common wall (29).

8. The system of claim 4, wherein the rotational speed of the first agitator (16) is greater than the rotational speed of the second agitator (17).

9. The system of any one of claims 4 to 8, further comprising a PLC control device, wherein the water inlet pump (35), the first stirrer (16), the second stirrer (17), the phosphorus removal agent feeding pump (7), the flocculating agent feeding pump (8), the pH meter (10), the acid adding pump (5), the alkali adding pump (6), the thermometer (11) and the cooling water pump (36) are respectively connected with the PLC control device, wherein the first stirrer (16), the second stirrer (17), the phosphorus removal agent feeding pump (7) and the flocculating agent feeding pump (8) are respectively in linkage control with the water inlet pump (35), the acid adding pump (5) and the alkali adding pump (6) are respectively in linkage control with the pH meter (10), and the cooling water pump (36) is in linkage control with the thermometer (11).