CN212334752U - Control device for accurately adding phosphorus removal agent in multistage A/O process - Google Patents
Control device for accurately adding phosphorus removal agent in multistage A/O process Download PDFInfo
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- CN212334752U CN212334752U CN202020854497.4U CN202020854497U CN212334752U CN 212334752 U CN212334752 U CN 212334752U CN 202020854497 U CN202020854497 U CN 202020854497U CN 212334752 U CN212334752 U CN 212334752U
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Abstract
A dephosphorization agent accurate feeding control device of a multistage A/O process belongs to the field of sewage treatment. The device comprises a control device, an effluent total phosphorus, an effluent orthophosphate of a secondary sedimentation tank, an ORP on-line monitoring system and a multipoint water inlet proportion control unit, wherein an aerobic zone of a tail section A/O is provided with an internal reflux control unit connected with an anoxic zone of a first section A/O, the secondary sedimentation tank is provided with an external reflux control unit connected with the anoxic zone of the first section A/O and a sludge discharge control unit connected with a sludge storage tank, and a dosing pump is connected with a phosphorus removal medicament dosing control unit; the phosphorus removal agent feeding point is arranged in the secondary sedimentation tank, and the control device comprises a detection instrument, a frequency converter and an industrial personal computer; the detecting instrument comprises a water inlet amount instrument arranged at an inlet of each anoxic zone of the multiple sections of A/O, an inner (outer) backflow flow instrument arranged on an inner (outer) backflow pipeline, an online orthophosphate detecting instrument arranged at a water outlet of the biochemical tank, an online total phosphorus detecting instrument at a water outlet of the secondary sedimentation tank, a sludge concentration meter and a sludge discharge flow instrument on a sludge discharge pipeline. The utility model discloses accurate control dephosphorization process, the effect is stable.
Description
Technical Field
The utility model relates to a municipal sewage treatment control device, in particular to a control device for the precise addition of a phosphorus removal medicament of a multistage AO process.
Background
The serious eutrophication of water is a major problem facing human beings at present, which is mainly caused by the over-high concentration of nutrient substances such as phosphorus in the water. In order to solve the problems of low carbon-nitrogen ratio of inlet water, unstable treatment effect, high medicine consumption and the like of the existing sewage treatment plant, the multi-stage AO process is widely applied. The multi-stage AO process is characterized in that the biological reaction tank forms a mode of a plurality of groups of anoxic tanks and aerobic tanks which are alternated. The sewage flowing into each stage of anoxic section by water inlet pipe section reduces the interference of DO and pH of the effluent of the front stage to the anoxic treatment of the rear stage and provides enough carbon source for the biological nitrogen and phosphorus removal process. In addition to biological phosphorus removal, in order to reach the national sewage treatment discharge standard, a sewage treatment plant can ensure that the effluent water reaches the standard by chemically adding drugs for phosphorus removal. However, due to the problems of technology and control level, the actual operation of part of the multi-stage AO process sewage plant has high energy consumption and drug consumption, and the fine operation is difficult. Therefore, a control device for accurately adding a phosphorus removal agent aiming at a multistage AO process needs to be developed, so that the operation efficiency of a sewage plant is improved, the medicine consumption is reduced, and the stable standard of effluent is ensured.
Disclosure of Invention
The utility model aims at solving the technical problem, provide a controlling means is thrown to dephosphorization medicament accuracy that relates to multistage AO technology, improve throwing of medicament and throw and utilize efficiency, realize that sewage treatment is high-efficient, steady operation.
The utility model aims at realizing through the following devices:
the multistage AO reactor is divided into three sections I, II and III, wherein the section I and the section III comprise two anoxic zones and an aerobic zone, the section II comprises two anoxic zones and two aerobic zones, the section I comprises two anoxic zones and two aerobic zones, namely a first anoxic zone 1, a second anoxic zone 2 and a first aerobic zone 3, the section II comprises a third anoxic zone 4, a fourth anoxic zone 5, a second aerobic zone 6 and a third aerobic zone 7, and the section III comprises a fifth anoxic zone 8, a sixth anoxic zone 9 and a fourth aerobic zone 10; a water outlet of the secondary sedimentation tank 11 is provided with an online total phosphorus detection instrument 12.1, the secondary sedimentation tank 11 is provided with an adding pump 11.4, and the adding pump 11.4 is connected with a frequency converter 11.5 and a medicine storage 11.6; the anoxic zone 1 is provided with a water inlet pipe, the water inlet pipe is provided with a first point water inlet pump 1.1 and a first point water inlet flow meter 1.2, and a first anoxic ORP instrument 1.3 is arranged in the anoxic zone 1; the anoxic zone 4 is provided with a water inlet pipe, a second point water inlet pump 4.1 and a second point water inlet flow meter 4.2 are arranged on the water inlet pipe, and a second anoxic ORP meter 4.3 is arranged in the anoxic zone 4; the anoxic zone 8 is provided with a water inlet pipe, a third point water inlet pump 8.1 and a third point water inlet flow meter 8.2 are arranged on the water inlet pipe, and a second anoxic ORP instrument 8.3 is arranged in the anoxic zone 8; the aerobic zone 10 is provided with an inner return pipe to the anoxic zone 2, and the inner return pipe is provided with an inner return pump 10.1 and an inner return flowmeter 10.2; the secondary sedimentation tank 11 is provided with an internal and external flow pipe to the anoxic zone 1, and an external reflux pump 14.1 and an external reflux flowmeter 14.2 are arranged on an external reflux pipe; the secondary sedimentation tank 11 is provided with a sludge discharge pipe to a sludge storage tank 11.4, and the sludge discharge pipe is provided with a sludge discharge pump 11.1, a sludge flowmeter 11.2 and a sludge concentration meter 11.3; an online orthophosphate detection instrument 12.2 is arranged at the water outlet of the aerobic tank 10; the integrated controller comprises a water inlet flow distribution module 13.1, a sludge discharge amount control module 13.2, a total phosphorus online data analysis module 13.3, a feedforward prediction control module 13.4, a feedback prediction control module 13.5 and a medicament adding amount control module 13.6.
Compared with the prior art, the phosphorus removal agent accurate feeding control device and method of the multi-stage A/O process of the utility model have the following advantages:
1. the dephosphorization effect is good, the total phosphorus in the effluent can be flexibly controlled according to the requirements, and the method is safe and reliable.
2. Because of the converter has simple structure, dependable performance, energy-conserving characteristics that are showing, make dephosphorization medicament dosage more adapt to the technological requirement, improve sewage treatment effect, reduce the medicament pump energy consumption, compare with the control mode of invariable dephosphorization medicament dosage, the utility model provides a method can save the power consumption about 5-10%.
The utility model discloses but wide application is applicable to cities and towns sewage advanced treatment and phosphorus-containing industrial wastewater treatment, and the specially adapted has sewage treatment plant to upgrade the transformation engineering for producing high-quality reclaimed water and going on.
The scheme and the specific conditions can be adjusted according to the actual operation condition.
Drawings
Fig. 1 is a schematic structural view of the present apparatus.
Detailed Description
The objects and functions of the present invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below, which may be implemented in various forms. The nature of the description is merely to assist those skilled in the relevant art in a comprehensive understanding of the specific details of the invention.
According to the utility model, the device is applied to a multi-stage AO device, the operation condition of the device is that the sludge concentration is set at 1500-4500mg/L, the water inlet flow changes 10-40L/h, the adjustable range of the internal reflux is 0-60L/h, and the adjustable range of the external reflux is 0-30L/h. The anoxic hydraulic retention time is 4.28h, the aerobic area hydraulic retention time is 2.85h, when the process is started, the water inflow rate of the first point is 15L/h, the water inflow rate of the second point is 15L/h, and the total water inflow rate is 30L/h; the internal reflux proportion is 200%; the external reflux ratio was 75%. The device process flow and the control device are schematically shown in the attached figure 1.
The control logic sequence of the control device is that firstly the water inlet flow distribution proportion is determined according to the water inlet flow change, the sludge discharge amount is adjusted according to the orthophosphate concentration of the outlet water of the biochemical tank, then the feedforward prediction compensation control condition is determined according to the water inlet adjustment, then the feedback compensation control is determined according to the total phosphorus concentration change rate of the outlet water, and finally the reagent adding amount of the phosphorus removal reagent adding system is determined in real time.
The implementation process is characterized in that the device and the method for controlling the carbon source adding of the multistage AO process activated sludge reactor are as follows: the multistage AO reactor is divided into three sections I, II and III, wherein the section I and the section III comprise two anoxic zones and an aerobic zone, the section II comprises two anoxic zones and two aerobic zones, the section I comprises two anoxic zones and two aerobic zones, namely a first anoxic zone 1, a second anoxic zone 2 and a first aerobic zone 3, the section II comprises a third anoxic zone 4, a fourth anoxic zone 5, a second aerobic zone 6 and a third aerobic zone 7, and the section III comprises a fifth anoxic zone 8, a sixth anoxic zone 9 and a fourth aerobic zone 10; a water outlet of the secondary sedimentation tank 11 is provided with an online total phosphorus detection instrument 12.1, the secondary sedimentation tank 11 is provided with an adding pump 11.4, and the adding pump 11.4 is connected with a frequency converter 11.5 and a medicine storage 11.6; the anoxic zone 1 is provided with a water inlet pipe, the water inlet pipe is provided with a first point water inlet pump 1.1 and a first point water inlet flow meter 1.2, and a first anoxic ORP instrument 1.3 is arranged in the anoxic zone 1; the anoxic zone 4 is provided with a water inlet pipe, a second point water inlet pump 4.1 and a second point water inlet flow meter 4.2 are arranged on the water inlet pipe, and a second anoxic ORP meter 4.3 is arranged in the anoxic zone 4; the anoxic zone 8 is provided with a water inlet pipe, a third point water inlet pump 8.1 and a third point water inlet flow meter 8.2 are arranged on the water inlet pipe, and a second anoxic ORP instrument 8.3 is arranged in the anoxic zone 8; the aerobic zone 10 is provided with an inner return pipe to the anoxic zone 2, and the inner return pipe is provided with an inner return pump 10.1 and an inner return flowmeter 10.2; the secondary sedimentation tank 11 is provided with an internal and external flow pipe to the anoxic zone 1, and an external reflux pump 14.1 and an external reflux flowmeter 14.2 are arranged on an external reflux pipe; the secondary sedimentation tank 11 is provided with a sludge discharge pipe to a sludge storage tank 11.4, and the sludge discharge pipe is provided with a sludge discharge pump 11.1, a sludge flowmeter 11.2 and a sludge concentration meter 11.3; an online orthophosphate detection instrument 12.2 is arranged at the water outlet of the aerobic tank 10; the integrated controller comprises a water inlet flow distribution module 13.1, a sludge discharge amount control module 13.2, a total phosphorus online data analysis module 13.3, a feedforward prediction control module 13.4, a feedback prediction control module 13.5 and a medicament adding amount control module 13.6.
The control logic sequence is that the distribution proportion of the inflow water flow is adjusted according to the ORP of the anoxic zone, the external reflux proportion is further adjusted according to the change of the inflow water flow, and the sludge discharge amount is adjusted according to the concentration of the orthophosphate of the effluent of the biochemical pool; and determining feed-forward predictive compensation control conditions for adding the phosphorus removal agent according to the water inlet flow distribution proportion and the sludge discharge amount, determining feedback compensation control according to the total phosphorus of the outlet water, and finally determining the agent adding amount of a phosphorus removal agent adding control unit in real time.
Claims (1)
1. A control device for accurately adding a phosphorus removal medicament of a multistage A/O process is characterized in that:
the multistage AO reactor of multistage is divided into three sections I, II, III, I section and III section all include two anoxic zones and an aerobic zone, I section includes two anoxic zones and two aerobic zones, namely first anoxic zone, second anoxic zone and first aerobic zone, II section includes third anoxic zone, fourth anoxic zone, second aerobic zone and third aerobic zone, III section includes fifth anoxic zone, sixth anoxic zone and fourth aerobic zone; the water outlet of the secondary sedimentation tank is provided with an online total phosphorus detection instrument, the secondary sedimentation tank is provided with a feeding pump, and the feeding pump is connected with a frequency converter and a medicine storage tank; the first anoxic zone is provided with a water inlet pipe, the water inlet pipe is provided with a first point water inlet pump and a first point water inlet flow meter, and a first anoxic ORP instrument is arranged in the first anoxic zone; the third anoxic zone is provided with a water inlet pipe, a second point water inlet pump and a second point water inlet flow meter are arranged on the water inlet pipe, and a second anoxic ORP meter is arranged in the third anoxic zone; a water inlet pipe is arranged in the fifth anoxic zone, a third point water inlet pump and a third point water inlet flow meter are arranged on the water inlet pipe, and a second anoxic ORP instrument is arranged in the fifth anoxic zone; the fourth aerobic zone is provided with an inner return pipe to the second anoxic zone, and the inner return pipe is provided with an inner return pump and an inner return flowmeter; the secondary sedimentation tank is provided with an inner and outer flow pipe to the first anoxic zone, and an outer reflux pump and an outer reflux flowmeter are arranged on the outer reflux pipe; the secondary sedimentation tank is provided with a sludge discharge pipe to the sludge storage tank, and the sludge discharge pipe is provided with a sludge discharge pump, a sludge flowmeter and a sludge concentration meter; an online orthophosphate detection instrument is arranged at the water outlet of the aerobic tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114560561A (en) * | 2022-03-14 | 2022-05-31 | 北京碧水源科技股份有限公司 | MBR process nitrogen and phosphorus removal dosing coupling membrane pollution intelligent control system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114560561A (en) * | 2022-03-14 | 2022-05-31 | 北京碧水源科技股份有限公司 | MBR process nitrogen and phosphorus removal dosing coupling membrane pollution intelligent control system and method |
| CN114560561B (en) * | 2022-03-14 | 2023-11-03 | 北京碧水源科技股份有限公司 | Intelligent control system and method for denitrification and dephosphorization dosing coupling membrane pollution of MBR process |
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