CN112520822A - Medicament adding system and method for strengthening high-load operation of sewage treatment plant - Google Patents
Medicament adding system and method for strengthening high-load operation of sewage treatment plant Download PDFInfo
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- CN112520822A CN112520822A CN202010973028.9A CN202010973028A CN112520822A CN 112520822 A CN112520822 A CN 112520822A CN 202010973028 A CN202010973028 A CN 202010973028A CN 112520822 A CN112520822 A CN 112520822A
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- medicament
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a medicament adding system and a method for strengthening high-load operation of a sewage treatment plant, wherein the medicament adding system comprises a dispensing tank (1), a dispensing pipe (2), a dispensing pipe (3), a stirring paddle (4), a metering pump (5), a regulating valve (6), a medicament adding pipe (7), a sludge concentration monitor (8), a settlement monitoring device (9), an SV30 analyzer (10), a mixed liquid sampling pump (11), a biochemical pool (12), a medicament mixer (13), a water channel (14), a secondary sedimentation pool (15), an online mud level monitor (16) and a PLC system (17). The invention utilizes the characteristics of the high-efficiency flocculating agent, develops and optimizes the dosing control system, improves the use efficiency of the medicament, and ensures stable operation, thereby realizing the strengthening of high-load operation of the sewage treatment plant.
Description
Technical Field
The invention relates to the field of municipal sewage treatment, in particular to a medicament adding system and a method for improving the sedimentation performance of sewage activated sludge.
Background
With the rapid development of cities in China, overflow pollution caused by municipal pipe network problems is a key difficulty for further quality improvement and efficiency improvement of current water environment projects. In order to reduce overflow pollution, three technical measures of source, midway and tail end are generally adopted. The contrast research shows that the problems of extremely long time consumption of modification, huge consumption, high investment scale and the like exist in source sponge and midway pipe network modification, and the scale is improved by the terminal treatment measure, namely the high-load operation of a sewage treatment plant, and the short-term effect is the most obvious technical measure. However, on the one hand, the design hydraulic load of the secondary sedimentation tank is limited; on the other hand, the problems of sludge bulking and the like commonly existing in a biochemical system increase the difficulty of mud-water separation of a secondary sedimentation tank, so that the quality of effluent water is deteriorated, and the implementation of high-load operation of a sewage plant is directly influenced. In order to solve the problem of sludge bulking, inorganic ferric salt and aluminum salt flocculating agents are generally added, but the problems of large dosage of agents, influence on microbial activity and the like exist. Researchers have developed a variety of mixed high efficiency grade polymers to address the deficiencies of existing flocculants. Therefore, aiming at the characteristics of efficient and efficient flocculating agents, a system and a method for controlling optimal configuration and addition of the agents are developed, the addition amount is reduced, the flocculation effect is improved, and the method has important significance in realizing high-load operation of sewage plants.
Disclosure of Invention
Aiming at the problems of high load bottleneck of the sewage treatment plant, hydraulic load of a secondary sedimentation tank, sludge bulking and the like at present, the invention aims to develop a system and a method for adding a high-efficiency flocculating agent for sludge sedimentation so as to solve the problem of poor using effect of a traditional Chinese medicine in the prior art.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the adding system of the high-efficiency flocculating agent for sludge sedimentation comprises: a dispensing tank, a dispensing pipe and a water distribution pipe; a stirring paddle is arranged in the dispensing tank, a dosing pipe is arranged at the lower end of the dispensing tank, and a metering pump and an adjusting valve are respectively arranged on the dispensing tank; the tail end of the chemical feeding pipe is provided with a chemical mixer which is completely immersed in the biochemical water channel; the biochemical tail end is connected with the secondary sedimentation tank through a biochemical water channel; the biochemical tail end is provided with a sludge concentration monitor, a mixed liquid sampling pump, a sedimentation monitoring device, an SV30 analyzer and an online sludge level monitor in a secondary sedimentation tank; the metering pump, the SV30 analyzer, the sludge concentration monitor and the online sludge level monitor are connected with the PLC system.
Further, the dispensing tank, the dispensing pipe, the stirring paddle, the dosing metering pump, the dosing pipe and the medicament mixer are all made of corrosion-resistant materials.
Further, mixed liquid sampling pump in the biochemical pond is mixed liquid pump and is gone into in the settlement monitoring facilities, and the SV30 analysis appearance is uploaded the liquid level reading in the monitoring facilities to the PLC system.
Further, the medicament mixer comprises a rotating rod, a supporting frame, a flexible stirring paddle and a medicament spraying opening; the dwang is connected with the pencil that adds, and the upper portion and the lower part of dwang all are provided with spouts medicine mouth, install the support frame on the dwang, and install flexible stirring rake in the support frame, and two flexible stirring rake symmetries are installed in the dwang both sides.
Furthermore, a medicament mixer is installed according to the width of the biochemical water channel, and a mixer is installed in the preferable installation range of 0.8-1.5 m.
A method for adding a medicament for strengthening high-load operation of a sewage treatment plant comprises the following steps:
the PLC system controls the adding sequence of the high-efficiency flocculating agent and tap water, water is added into the dispensing tank through the water distribution pipe, when the water amount in the dispensing tank is one-half, the dispensing pipe is opened to add the high-efficiency flocculating agent into the pipe, and meanwhile, stirring is started to mix.
Furthermore, the dilution times of the optimized efficient flocculating agents are controlled to be 5-20 times.
Further, feeding back to the PLC system according to the inlet water hydraulic load and the secondary sedimentation tank mud level monitor signal, and jointly judging the start and stop of the medicament adding, wherein the start and stop conditions are
Wherein 0 is a stop device, 1 is a start state, L is a predicted sludge blanket, H is an effective depth, R is a sludge reflux amount, and QhFor treating the water quantity, SVτThe actual retention time of the sludge is shown, and alpha is a sludge settlement correction coefficient.
Further, the concentration of the activated sludge of the agent suitable for the biochemical pool is 3000-8000 mg/L.
Further, the activated sludge concentration is uploaded to the PLC system through the sludge monitor data.
Furthermore, the SV30 of the activated sludge is tested in a mode that 1 hour is taken as a period, mixed liquor is pumped into monitoring equipment through a mixed liquor sampling pump, the volume of the mixed liquor is 1L each time, and after standing for 30min, the reading of the layered liquid level is uploaded to a PLC system through an SV30 analyzer.
Further, a background analysis module of the PLC system calculates the concentration of the activated sludge and the SVI value corresponding to the SV30, and feeds the result back to the control module to adjust the flow rate of the dosing metering pump.
Further, the concentration of the added medicament is related to the SVI value of the activated sludge, and the control relationship is as follows:
D＝βeSVI (5)
wherein MLSS is sludge concentration, beta is dosing coefficient, SVI is precipitation performance evaluation index, and D is medicament dosing amount.
The invention has the following beneficial effects:
according to the dosing system and method of the high-efficiency flocculant, the using effect of the high-efficiency flocculant is improved, the dosing amount is controlled through the PLC control system according to the logical relation between the activated sludge and the dosing amount, the water quality of effluent is guaranteed, and the dosing amount of the reagent is effectively controlled, so that the problems of high-load operation and sludge bulking of a water plant are solved.
Drawings
FIG. 1 is a schematic view of a dosing system provided by the present invention.
1 is a dispensing tank, 2 is a dispensing pipe, 3 is a dispensing pipe, 4 is a stirring paddle, 5 is a metering pump, 6 is a regulating valve, 7 is a dosing pipe, 8 is a sludge concentration monitor, 9 is a settlement monitoring device, 10 is an SV30 analyzer, 11 is a mixed liquid sampling pump, 12 is a biochemical pool, 13 is a medicament mixer, 14 is a water channel, 15 is a secondary sedimentation pool, 16 is an online mud level monitor, and 17 is a PLC system.
Fig. 2 is a schematic structural view of the medication mixer provided by the present invention.
13-1 is a rotating rod, 13-2 is a supporting frame, 13-3 is a flexible stirring paddle, and 13-4 is a medicine spraying opening.
FIG. 3 shows the parameters of the effluent quality of the secondary sedimentation tank.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way.
In the embodiment shown in fig. 1, a chemical dosing system for enhancing high-load operation of a sewage treatment plant comprises: a dispensing pipe (2) and a water distribution pipe (3) are respectively arranged at the upper end of a dispensing tank (1), a stirring paddle (4) is arranged at the bottom in the dispensing tank, a dosing pipe (7) is arranged at the lower end of the dispensing tank (1), a dosing metering pump (5) is connected with an adjusting valve (6) through the dosing pipe, the tail end of the dosing pipe is connected with a medicament mixer (13), and the medicament mixer is completely immersed in a biochemical water channel (11); be equipped with mud concentration monitor (8), mixed liquid sample pump (11), settlement monitoring equipment (9), SV30 analysis appearance (10) in biochemical pond end (9), be equipped with online mud level monitor (16) in two heavy ponds (15), measuring pump (5), mud concentration monitor (8), SV30 analysis appearance, online mud level monitor (16) be connected with PLC system (14).
In the embodiment, the biochemical water channel (11) is 1.2m wide, and a reagent mixer (10) is arranged in the channel.
The stirring paddle is made of polytetrafluoroethylene acid corrosion resistant materials, and double layers of paddles are used for enhancing the mixing of the medicaments;
dosing a dosing pump: adopting an acid-proof metering pump with the model of GM0050-PVDF pump;
sludge concentration monitor: the model is HACH-TSS;
settlement monitoring equipment: self-made organic glass material container with scales;
SV30 analyzer: model number CC2900 ep;
a mixed liquid sampling pump: the model is PD016-708NI
A medicament mixer: self-made, wherein the rigid part is 304 stainless steel, and the flexible stirring paddle is made of polytetrafluoroethylene material;
on-line mud level monitor: an ultrasonic mud level meter with the model of RMD.
A PLC system: and S7-300, setting an isolator at input IO, setting a signal arrester at analog quantity, setting a UPS power supply in the cabinet, and configuring an Ethernet optical fiber switch.
In the embodiment, a medicament adding method for improving the sedimentation performance of sewage activated sludge comprises the following steps:
the inflow rate is 850m3The hydraulic load is 1.2 times of the design load of the secondary sedimentation tank, the online sludge concentration monitor shows that the sludge concentration in the biochemical tank is 4000-4500mg/L, and the SVI of the biochemical system is 130-150mL/g by combining with the regular data of the monitoring equipment of the SV 30. The sludge in the secondary sedimentation tank is 3.5-4m, the height of the secondary sedimentation tank is 5m, and a small amount of sludge overflows from the outlet water of the secondary sedimentation tank.
Preferably, the high-efficiency flocculant is diluted by 10 times, and the dilution ratio is 10 percent by volume (v/v).
According to the control system, the preferable dosage (D) of the medicament is determined according to the control logic relation, and then the secondary sedimentation tank mud level (L) is used as a post-feedback control condition.
The PLC system transmits a control signal to the metering pump, the metering pump inputs the dosage into the dosing pipe according to the optimized dosage, and the diluted medicament is fully mixed with the activated sludge in the biochemical mixed liquid through the medicament mixer (10) and then enters the secondary sedimentation tank.
Monitoring the sludge level in the secondary sedimentation tank by a sludge level monitor along with the addition of the medicament, reducing the average sludge level from 3.2m to 2.5m after adding for 30min, ensuring that the average sludge level is stabilized at 2.2m after 2h along with the prolonging of time, and showing the water quality indexes before and after adding the medicament into effluent as shown in figure 3.
Claims (10)
1. The utility model provides a strengthen medicament dosing system of sewage treatment plant high load operation which characterized in that: comprises a dispensing pot (1), a dispensing pipe (2) and a dispensing pipe (3); a stirring paddle (4) is arranged in the dispensing tank (1), and a dosing pipe (7) is arranged at the lower end of the dispensing tank (1); the dosing tank (1) is respectively provided with a dosing metering pump (5) and an adjusting valve (6); a medicament mixer (13) is arranged at the tail end of the medicament feeding pipe (7), and the medicament mixer (13) is completely immersed in the biochemical water channel (14); the biochemical tail end (12) is connected with a secondary sedimentation tank (15) through a biochemical water channel (14); a sludge concentration monitor (8), a mixed liquid sampling pump (11), a settlement monitoring device (9) and an SV30 analyzer (10) are arranged in the biochemical tail end (12); an online mud level monitor (16) is arranged in the secondary sedimentation tank (15); the metering pump (5), the sludge concentration monitor (8), the SV30 analyzer (10) and the online sludge level monitor (16) are all connected with a PLC system (17).
2. The agent dosing system for enhancing high load operation of a sewage treatment plant according to claim 1, wherein: the dispensing tank (1), the dispensing pipe (2), the stirring paddle (4), the dosing metering pump (5), the dosing pipe (7), the mixed liquid sampling pump (11) and the medicament mixer (13) are all made of corrosion-resistant materials.
3. The agent dosing system for enhancing high load operation of a sewage treatment plant according to claim 1, wherein: a mixed liquid sampling pump (11) in the biochemical pool pumps the mixed liquid into the settlement monitoring device (9), and an SV30 analyzer (10) uploads the liquid level reading in the settlement monitoring device (9) to a PLC system (17).
4. The agent dosing system for enhancing high-load operation of a sewage treatment plant according to claim 1 or 2, wherein: the medicament mixer comprises a rotating rod (13-1), a supporting frame (13-2), a flexible stirring paddle (13-3) and a medicament spraying opening (13-4); the rotating rod (13-1) is connected with the medicine feeding pipe (7), the upper part and the lower part of the rotating rod (13-1) are respectively provided with a medicine spraying opening (13-4), the rotating rod (13-1) is provided with a support frame (13-2), the support frame (13-2) is internally provided with a flexible stirring paddle (13-3), and the two flexible stirring paddles (13-3) are symmetrically arranged at two sides of the rotating rod (13-1).
5. The agent dosing system for enhancing high load operation of a sewage treatment plant according to claim 3, wherein: a medicament mixer (13) is arranged every 0.8-1.5m in the width direction of the biochemical water channel (14).
6. A method for dosing chemicals for enhancing high load operation of a sewage treatment plant using the system of any one of claims 1 to 5, characterized in that: the PLC system (17) controls the dispensing sequence to firstly add water into the dispensing tank (1) through the water distribution pipe (3), when the water amount in the dispensing tank is half, the dispensing pipe (2) is opened to add the medicine into the pipe, and the stirring paddle (4) is opened at the same time.
7. The method for adding the agent for improving the sedimentation performance of the sewage activated sludge according to claim 6, wherein the method comprises the following steps: the flocculation reagent in the dispensing tank (1) is diluted by 5-20 times.
8. The method for adding the agent for strengthening the high-load operation of the sewage treatment plant according to claim 6, which is characterized in that: controlling the start and stop of adding the medicament, and jointly judging according to the hydraulic load of inlet water and the mud level of the secondary sedimentation tank; the start-stop condition is
Wherein 0 is a stop device, 1 is a start state, L is a predicted sludge blanket, H is an effective depth, R is a sludge reflux amount, and QhFor treating the water quantity, SVτThe actual retention time of the sludge is shown, and alpha is a sludge settlement correction coefficient.
9. The method for adding the agent for strengthening the high-load operation of the sewage treatment plant according to claim 8, which is characterized in that: the concentration of the added medicament is related to the SVI value of the activated sludge, and the control relation of the medicament adding concentration is shown in the following table:
D＝βeSVI (5)
wherein MLSS is sludge concentration, beta is reaction coefficient, SVI is, and D is dosage of medicament.
10. The method for adding the agent for strengthening the high-load operation of the sewage treatment plant according to claim 9, which is characterized in that: the concentration of the activated sludge is uploaded to a PLC system through the data of a sludge monitor, and the concentration of the activated sludge in the biochemical pool is 3000-8000 mg/L;
the SV30 of the activated sludge is tested in a mode that 1 hour is taken as a period, mixed liquor is pumped into monitoring equipment by a mixed liquor sampling pump, the volume of the mixed liquor is 1L each time, and after standing for 30min, the reading of the layered liquid level is uploaded to a PLC system by an SV30 analyzer;
and the PLC system background analysis module calculates the concentration of the activated sludge and the SVI value corresponding to SV30, feeds the result back to the control module, and adjusts the flow of the dosing metering pump (6).
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| CN202010973028.9A CN112520822B (en) | 2020-09-16 | 2020-09-16 | Reagent feeding system and method for strengthening high-load operation of sewage treatment plant |
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| CN202010973028.9A CN112520822B (en) | 2020-09-16 | 2020-09-16 | Reagent feeding system and method for strengthening high-load operation of sewage treatment plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113307342A (en) * | 2021-06-07 | 2021-08-27 | 重庆中法环保研发中心有限公司 | Intelligent adding system for chemical phosphorus removal agent of high-density tank |
| CN113731245A (en) * | 2021-09-27 | 2021-12-03 | 安庆供水集团公司 | Automatic dosing device for intelligent water plant |
| CN115092997A (en) * | 2022-06-14 | 2022-09-23 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
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| CN213865527U (en) * | 2020-09-16 | 2021-08-03 | 北控水务(中国)投资有限公司 | Medicament adding system for strengthening high-load operation of sewage treatment plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113307342A (en) * | 2021-06-07 | 2021-08-27 | 重庆中法环保研发中心有限公司 | Intelligent adding system for chemical phosphorus removal agent of high-density tank |
| CN113307342B (en) * | 2021-06-07 | 2022-06-07 | 重庆中法环保研发中心有限公司 | Intelligent adding system for chemical phosphorus removal agent of high-density tank |
| CN113731245A (en) * | 2021-09-27 | 2021-12-03 | 安庆供水集团公司 | Automatic dosing device for intelligent water plant |
| CN115092997A (en) * | 2022-06-14 | 2022-09-23 | 温州杭钢水务有限公司 | Stable operation energy-saving consumption-reducing control method and system for high-load efficient sedimentation tank |
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| CN112520822B (en) | 2023-06-02 |
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