Intelligent sludge storage and discharge control system and method for regulating sludge concentration

Abstract

The application discloses a kind of intelligent sludge concentration system and method of sludge storage and discharge regulation, including discharge port, water inlet pump house, grid, sand trap, biochemical tank, secondary sedimentation tank, sludge pump pool, sludge return pump and sludge pump being set in sludge pump pool, intelligent sludge storage tank, sludge pipeline being set between sludge pump pool and intelligent sludge storage tank, electric valve being set in sludge pipeline, and automatic control system;The intelligent sludge storage tank is used for temporary storage of rain season return sludge;Automatic control system is adjusted by regulating on-line instrument, electric valve and pump, and then the sludge pump pool and intelligent sludge storage tank are cyclically regulated, to regulate the sludge concentration of biochemical tank.The application can realize stable operation of combined overflow emergency treatment station in dry season by regulating sludge concentration of biochemical tank through intelligent sludge storage tank and automatic control system, increase in quality in rainy season, improve treatment capacity, increase operating income, reduce pollution discharge of combined overflow to river channel, and improve water environmental quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water environment treatment, in particular to an intelligent sludge storage and discharge regulation system and method for regulating sludge concentration. BACKGROUND

[0002] At present, the problems of pipeline deposition caused by long-term low flow operation of drainage pipeline system in dry season, misconnection and missed connection of sewage pipeline to rainwater pipeline, etc. are more prominent in China, and combined sewer overflow pollution is an important source of black and odorous river and non-compliance of section in many cities. Combined sewer overflow sewage has higher content of particulate matter and suspended solids, and has a certain concentration of organic matter, and the water quality and quantity fluctuate more greatly, with intermittent and explosive characteristics, and has a stronger short-time impact on river water quality.

[0003] The bypass emergency treatment station, as a combined sewer overflow outlet end treatment facility, is generally a small integrated device with secondary treatment as the main part, which has the advantages of simple structure, low cost, convenient maintenance and management, and small occupation. Since the design basis of the emergency treatment station is the pipe network design data and the preliminary survey data, and the actual water quality and quantity, especially the combined sewer overflow in the rainy season, are difficult to predict, it is difficult for the emergency treatment station to run stably due to the large fluctuation of water quality and quantity of the combined sewer overflow outlet in the dry season and the rainy season. In the dry season, the combined sewer pipe network inflow is mainly domestic sewage and pipe network sediment, the ammonia nitrogen concentration of the emergency treatment station inflow is high, the nitrification capacity of the system is insufficient, and the actual treatment capacity is limited; in the rainy season, the sludge concentration of the biochemical tank is high, and the secondary sedimentation tank is limited by the design solid flux and cannot meet the water quantity improvement requirement.

[0004] How to realize stable operation of the emergency treatment station in the dry season, increase in the rainy season, and ensure stable and standard effluent, and improve the treatment capacity of the process for the excess mixed sewage in the rainy season is an urgent problem to be solved for combined sewer overflow pollution control. SUMMARY

[0005] The present application overcomes the deficiencies of the prior art, and uses an intelligent sludge storage and discharge regulation system and method to solve the problems raised in the background.

[0006] An intelligent sludge storage and discharge regulation system, which comprises an outlet, a water inlet pump house, a grid, a sand trap, a biochemical tank, a secondary sedimentation tank, a sludge pump tank, a sludge return pump and a sludge pump arranged in the sludge pump tank, an intelligent sludge storage tank, a sludge pipeline arranged between the sludge pump tank and the intelligent sludge storage tank, an electric valve arranged in the sludge pipeline, and an automatic control system.

[0007] The biochemical tank and the secondary sedimentation tank are used for the main sewage treatment process.

[0008] The sludge pump tank is used for receiving activated sludge discharged from the bottom of the secondary sedimentation tank, discharging backflow sludge and residual sludge.

[0009] The intelligent sludge storage tank is used for temporarily storing backflow sludge in the rainy season, and constitutes a cycle with the sludge pump tank.

[0010] The water inlet pump house is provided with a water inlet lifting pump.

[0011] The grid is provided with a water inlet online NH3-N instrument and a water inlet online liquid level or flow meter, which are used for linkage opening and speed adjustment of the water inlet lifting pump of the water inlet pump house.

[0012] The biochemical tank is provided with an online DO instrument and an online MLSS instrument.

[0013] The secondary sedimentation tank is provided with an online sludge level meter, a water outlet online NH3-N instrument and a water outlet online SS instrument.

[0014] The sludge pump tank is provided with an online backflow sludge concentration instrument, a backflow flow meter, a sludge backflow pump, a sludge pump and a residual sludge pump.

[0015] The intelligent sludge storage tank is provided with a sludge agitator and a liquid level relay, and the liquid level relay controls the start and stop of the sludge agitator.

[0016] The water inlet online NH3-N instrument, the water inlet online liquid level instrument or flow meter, the water inlet lifting pump, the online MLSS instrument and the online sludge level meter are linked with the sludge backflow pump, the sludge pump and the electric valve through an automatic control system, and then the sludge pump tank and the intelligent sludge storage tank are cyclically adjusted, so that the sludge concentration of the biochemical tank is controlled.

[0017] As a further technical solution of the present application, the sludge pipeline comprises a first sludge pipe and a second sludge pipe, and the electric valve comprises a first electric valve arranged in the first sludge pipe and a second electric valve arranged in the second sludge pipe.

[0018] As a further technical solution of the present application, the sludge agitator at the lower side of the intelligent sludge storage tank is communicated with the lower part of the sludge pump tank through the first sludge pipe, and the upper part is communicated with the upper part of the sludge pump tank through the second sludge pipe.

[0019] As a further technical solution of the present application, the water inlet pump house, the sand trap, the biochemical tank and the secondary sedimentation tank are connected through a sewage pipeline.

[0020] The secondary sedimentation tank, the sludge pump tank and the biochemical tank are connected through a sludge pipeline.

[0021] Another technical solution is a method for controlling sludge concentration by using the intelligent sludge storage and discharge system as described in any one of the above technical solutions, which comprises the following steps:

[0022] Step S1, when the dry season condition, the biochemical pool is operated according to the design condition of the dry season, the sewage is treated through the grid, the water inlet pump house and the sand trap, and then enters the biochemical pool for reaction together with the return sludge, is separated from the solid-liquid in the secondary sedimentation tank, and then is discharged for subsequent treatment or discharge, the sludge in the secondary sedimentation tank is discharged into the sludge pump pool, the intelligent sludge storage tank is in the closed state, and the residual sludge is discharged through the residual sludge pump from the sludge pump pool through the sludge pipeline for treatment and disposal;

[0023] Step S2, under the rain season condition, when the water inlet water quantity exceeds the set working liquid level of the water inlet on-line liquid level instrument or flowmeter, and the water inlet on-line NH3-N instrument concentration is lower than 10 mg / L, the pre-warning starts the automatic control system, and the sludge concentration in the biochemical pool is linked and controlled; the water quantity of the water inlet pump house is increased to the design upper limit, the residual sludge pump is adjusted to increase the sludge discharge amount, the sludge return pump is adjusted to be small, the sludge pump is opened to discharge sludge into the intelligent sludge storage tank, the sludge pump is closed when the intelligent sludge storage tank reaches the highest liquid level, and the sludge pump is kept still for a period of time; the second electric valve is opened, the supernatant is returned to the sludge pump pool through the second sludge pipe, the sludge discharge, the standing and the supernatant return actions are repeated 2 to 3 times, until the sludge concentration in the biochemical pool is reduced to the set value two of the on-line MLSS instrument; the water quantity of the water inlet pump house is gradually increased to the set threshold value of the water inlet on-line liquid level instrument or flowmeter, the sludge discharge, the standing and the supernatant return actions are repeated 2 to 3 times, until the sludge concentration in the biochemical pool is reduced to the set value three of the on-line MLSS instrument; the sludge pump and the second electric valve are adjusted to be small, the liquid level relay reaches the set liquid level, the sludge agitator is started to stir, and the sludge is circulated between the intelligent sludge storage tank and the sludge pump pool;

[0024] Step S3, after the rain stops, the water quantity of the water inlet pump house is gradually reduced to the design flow of the dry season, the sludge pump and the second electric valve are closed, the first electric valve is opened, the high-concentration sludge in the intelligent sludge storage tank is quickly transported back to the sludge pump pool under the pushing of the sludge agitator through the first sludge pipe, the residual sludge pump is adjusted to be small to reduce the sludge discharge amount, and the sludge return pump is adjusted to be large until the set value one of the on-line MLSS instrument;

[0025] If the on-line sludge level meter reaches the threshold value, the residual sludge pump is adjusted to be large to increase the sludge discharge amount to reduce the sludge level of the secondary sedimentation tank; after the sludge in the intelligent sludge storage tank is emptied, the first electric valve is closed, the liquid level relay is lower than the set liquid level to stop the sludge agitator, and the sludge return pump and the residual sludge pump are adjusted to the flow in the dry season.

[0026] Compared with the prior art, the present application has the following technical effects:

[0027] By means of the intelligent sludge storage and discharge automatic control system, the sludge concentration of the biochemical tank is regulated and controlled to adapt to different operation conditions, so that the process can be stably operated in the dry season, the treatment capacity of the emergency treatment station for excess mixed sewage can be improved in the rainy season, the treatment load of the system for the mixed sewage after rain can be increased in a short period of time, and the quality and efficiency of the station are improved. Moreover, most of the emergency treatment stations are in the water quantity charging mode, and the increase of the treatment water quantity can increase the operating cost income. The regulation and control method can realize that the effluent of the emergency treatment station stably meets the standard, can reduce the overflow pollutants of the combined system into the river, is beneficial to reducing the overflow risk, guaranteeing that the river section meets the standard, supplementing the ecological flow, improving the reuse rate of water resources, and relieving the contradiction between water supply and demand, and has important significance for local water ecological restoration, improvement of the living environment, and improvement of the quality of people's life. BRIEF DESCRIPTION OF DRAWINGS

[0028] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings:

[0029] Figure 1 It is a structural schematic diagram of the system of the disclosed embodiments.

[0030] In the figure: 1, discharge port; 2, grid; 3, water inlet pump house; 4, grit chamber; 5, biochemical tank; 6, secondary sedimentation tank; 7, sludge pump tank; 8, intelligent sludge storage tank; 9, automatic control system; 10, water inlet online NH3-N instrument; 11, water inlet online liquid level instrument or flowmeter; 12, water inlet lifting pump; 13, online DO instrument; 14, online MLSS instrument; 15, online sludge level meter; 16, water outlet online NH3-N instrument; 17, water outlet online SS instrument; 18, online backflow sludge concentration instrument; 19, backflow flowmeter; 20, sludge backflow pump; 21, sludge pump; 22, excess sludge pump; 23, sludge agitator; 24, liquid level relay; 25, first sludge pipe; 26, second sludge pipe; 27, first electric valve; 28, second electric valve; 29, sewage pipeline; 30, sludge pipeline; 31, signal pipeline. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0032] Please refer to Figure 1In the embodiment of the present application, the system for regulating sludge concentration by intelligent sludge storage and discharge comprises a discharge port 1, a water inlet pump house 3, a grid 2, a grit chamber 4, a biochemical tank 5, a secondary sedimentation tank 6, a sludge pump tank 7, a sludge return pump 20 and a sludge pump 21 arranged in the sludge pump tank 7, an intelligent sludge storage tank 8, a sludge pipeline arranged between the sludge pump tank 7 and the intelligent sludge storage tank 8, an electric valve arranged in the sludge pipeline, and an automatic control system 9 connected to the electric valve.

[0033] In the embodiment, the biochemical tank 5 and the secondary sedimentation tank 6 are used for the main wastewater treatment process.

[0034] The sludge pump tank 7 is used for receiving activated sludge discharged from the bottom of the secondary sedimentation tank 6, discharging return sludge and residual sludge.

[0035] The intelligent sludge storage tank 8 is used for temporarily storing return sludge in the rainy season and constitutes a cycle with the sludge pump tank.

[0036] In the embodiment, the water inlet pump house 3 is provided with a water inlet lifting pump 12.

[0037] The grid 2 is provided with a water inlet online NH3-N instrument 10 and a water inlet online liquid level or flow meter 11, which are used for linkage opening and speed adjustment of the water inlet lifting pump 12 of the water inlet pump house 3.

[0038] The biochemical tank 5 is provided with an online DO instrument 13 and an online MLSS instrument 14.

[0039] The secondary sedimentation tank 6 is provided with an online sludge level meter 15, a water outlet online NH3-N instrument 16 and a water outlet online SS instrument 17.

[0040] The sludge pump tank 7 is provided with an online return sludge concentration instrument 18, a return flow meter 19, a sludge return pump 20, a sludge pump 21 and a residual sludge pump 22.

[0041] The intelligent sludge storage tank 8 is internally provided with a sludge agitator 23 and a liquid level relay 24, and the liquid level relay controls the start and stop of the sludge agitator.

[0042] The water inlet online NH3-N instrument 10, the water inlet online liquid level instrument or flow meter 11, the water inlet lifting pump 12, the online MLSS instrument 14 and the online sludge level meter 15 are linked with the sludge return pump 20, the sludge pump 21 and the electric valve through the automatic control system 9, the automatic control system 9 is connected with the above-mentioned devices and instruments through a signal pipeline 31, and then the sludge pump tank 7 and the intelligent sludge storage tank 8 are cyclically adjusted, so that the sludge concentration of the biochemical tank 5 is regulated.

[0043] In the embodiment, the sludge pipeline comprises a first sludge pipeline 25 and a second sludge pipeline 26, and the electric valve comprises a first electric valve 27 arranged in the first sludge pipeline 25 and a second electric valve 28 arranged in the second sludge pipeline 26.

[0044] In the embodiment, the return sludge is transported from the sludge pump tank 7 to the intelligent sludge storage tank 8 by the sludge pump 21 and the sludge pipeline 30, the first sludge pipeline 25 and the second sludge pipeline 26 can both transport the sludge from the intelligent sludge storage tank 8 back to the sludge pump tank 7, and the second sludge pipeline 26 can also transport the supernatant of the sludge back to the sludge pump tank 7.

[0045] In the embodiment, the lower sludge agitator 23 of the intelligent sludge storage tank 8 is connected with the lower part of the sludge pump tank 7 through the first sludge pipeline 25, and the upper part of the intelligent sludge storage tank 8 is connected with the upper part of the sludge pump tank 7 through the second sludge pipeline 26, the first sludge pipeline 25 is provided with the first electric valve 27, and the second sludge pipeline 26 is provided with the second electric valve 28.

[0046] In the embodiment, the water inlet pump house 3, the grit tank 4, the biochemical tank 5 and the secondary sedimentation tank 6 are connected through the sewage pipeline 29.

[0047] The secondary sedimentation tank 6, the sludge pump tank 7 and the biochemical tank 5 are connected through the sludge pipeline 30.

[0048] In the embodiment, the water inlet on-line liquid level instrument or flow meter 11 is used to link the opening and speed adjustment of the water inlet lifting water pump 12 in the water inlet pump house 3. The on-line MLSS instrument 14 and the on-line sludge level meter 15 are used to link the speed adjustment of the sludge return pump 20, the opening and speed adjustment of the sludge pump 21 and the opening and closing of the first electric valve 27 and the second electric valve 28. The sludge agitator 23 is used to agitate and push the sludge flow in the intelligent sludge storage tank 8, and the liquid level relay 24 is used to link the sludge agitator 23, so that the intelligent sludge storage tank 8 is powered off after the sludge is emptied. The on-line NH3-N instrument 10, the on-line DO instrument 13, the effluent on-line NH3-N instrument 16 and the effluent on-line SS instrument 17 are used to record and observe the running conditions of the system. The on-line return sludge concentration instrument 18 and the return flow meter 19 are used to record and observe the concentration and flow of the return sludge.

[0049] The water inlet on-line NH3-N instrument 10, the water inlet on-line liquid level instrument or flow meter 11, the water inlet lifting water pump 12, the on-line MLSS instrument 14 and the on-line sludge level meter 15 are linked with the sludge return pump 20, the sludge pump 21 and the first electric valve 27 through the automatic control system 9. The automatic control system 9 is closed in the dry season, and when the water inlet flow exceeds the set working liquid level 5000m 3 / d of the water inlet on-line liquid level instrument or flow meter 11 and the concentration of the water inlet on-line NH3-N instrument 10 is lower than 10mg / L, the automatic control system 9 is started to link and control the sludge concentration in the biochemical tank 5.

[0050] The technical scheme in another aspect: a method for controlling sludge concentration by using the intelligent sludge storage and discharge system according to any one of the above, comprising the following steps:

[0051] Step S1, when the dry season condition, the biochemical tank 5 is designed according to the dry season condition (the water inlet flow is about 4500-5000m3 / d) running, sewage after treatment by the grid 2, water pump house 3 and grit chamber 4 and the return sludge into the biochemical pool 5 reaction, from the secondary sedimentation tank 6 solid-liquid separation after discharge subsequent processing or discharge, secondary sedimentation tank 6 sludge into the sludge pump pool 7, intelligent sludge storage tank 8 is closed state, the remaining sludge through the remaining sludge pump 22 from the sludge pump pool 7 through the sludge pipeline 30 discharge for processing disposal; at this time the online MLSS instrument 14 display data in the set value - 3000 mg / L around.

[0052] Step S2, rain season, the water inflow online liquid level instrument or flowmeter 11 set working level 5000m 3 / d, and the inflow online NH3-N instrument 10 concentration is less than 10 mg / L, pre-warning start automatic control system 9, linkage control biochemical pool 5 sludge concentration; water pump house 3 water volume to the design upper limit of 5000m 3 / d, adjust the remaining sludge pump 22 to increase the sludge discharge, adjust the sludge return pump 20, and open the sludge pump 21 to the intelligent sludge storage tank 8, the intelligent sludge storage tank 8 reaches the highest liquid level, the sludge pump 21 is closed, and the sludge pump 21 is closed. 60 minutes, open the second electric valve 28, return the supernatant to the sludge pump pool 7 through the second sludge pipe 26, repeat the sludge feeding, standing and returning the supernatant action 2 to 3 times, until the sludge concentration in the biochemical pool 5 is reduced to the set value two 2000 mg / L; gradually increase the water volume of the water pump house 3 to the set threshold of the inflow online liquid level instrument or flowmeter 6000m 3 / d, repeat the sludge feeding, standing and returning the supernatant action 2 to 3 times, until the sludge concentration in the biochemical pool 5 is reduced to the set value three 1600 mg / L; adjust the sludge pump 21 and the second electric valve 28, the liquid level relay 24 reaches the set liquid level, start the sludge agitator 23 to stir, so that the sludge circulates between the intelligent sludge storage tank 8 and the sludge pump pool 7;

[0053] Step S3, after the rain stops, gradually reduce the water volume of the water pump house 3 to the design flow of 4500-5000m 3 / d, close the sludge pump 21 and the second electric valve 28, open the first electric valve 27, so that the high-concentration sludge in the intelligent sludge storage tank 8 is quickly transported back to the sludge pump pool 7 under the push of the sludge agitator 23, adjust the remaining sludge pump 22 to reduce the sludge discharge, and adjust the sludge return pump 20 until the set value one 3000 mg / L of the online MLSS instrument 14;

[0054] If the online sludge level meter 15 reaches the threshold, increase the sludge discharge of the remaining sludge pump 22 to reduce the sludge level of the secondary sedimentation tank 6; after the sludge in the intelligent sludge storage tank 8 is emptied, the first electric valve 27 is closed, the liquid level relay 24 is lower than the set liquid level, and the sludge agitator 23 is stopped. Adjust the sludge return pump 20 and the remaining sludge pump 22 to the flow rate in the dry season.

[0055] Through the intelligent sludge storage and discharge system, the sludge concentration in the biochemical tank is regulated, the sludge concentration in the biochemical tank after rain is quickly reduced, the sludge level in the secondary sedimentation tank is controlled, the effluent is stably up to the standard, and basically the stable operation in the dry season and the processing capacity of 20% increase of the mixed sewage after rain beyond the design flow are achieved.

[0056] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application is defined by the appended claims and their equivalents, and all should be included in the protection scope of the present application.

Claims

1. An intelligent sludge concentration system for regulating sludge concentration, characterized in that, The system comprises a discharge port, a water inlet pump house, a grid, a grit chamber, a biochemical tank, a secondary sedimentation tank, a sludge pump tank, a sludge return pump and a sludge pump arranged in the sludge pump tank, an intelligent sludge storage tank, a sludge pipeline arranged between the sludge pump tank and the intelligent sludge storage tank, an electric valve arranged in the sludge pipeline, and an automatic control system; The biochemical tank and the secondary sedimentation tank are used for the main wastewater treatment process; The sludge pump tank is used for receiving activated sludge discharged from the bottom of the secondary sedimentation tank, discharging return sludge and residual sludge; The intelligent sludge storage tank is used for temporarily storing return sludge in the rainy season and constitutes a cycle with the sludge pump tank; The water inlet pump house is provided with a water inlet lifting water pump; The grid is provided with a water inlet online NH3-N instrument and a water inlet online liquid level or flow meter, which are used for linkage of the opening and speed adjustment of the water inlet lifting water pump of the water inlet pump house; The biochemical tank is provided with an online DO instrument and an online MLSS instrument; The secondary sedimentation tank is provided with an online sludge level meter, an outlet water online NH3-N instrument and an outlet water online SS instrument; The sludge pump tank is provided with an online return sludge concentration instrument, a return flow meter, a sludge return pump, a sludge pump and a residual sludge pump; The intelligent sludge storage tank is internally provided with a sludge agitator and a liquid level relay, and the liquid level relay controls the start and stop of the sludge agitator; The water inlet online NH3-N instrument, the water inlet online liquid level instrument or flow meter, the water inlet lifting water pump, the online MLSS instrument and the online sludge level meter are linked with the sludge return pump, the sludge pump and the electric valve through the automatic control system, so as to make the sludge pump tank and the intelligent sludge storage tank circulate and control the sludge concentration of the biochemical tank; The sludge pipeline comprises a first sludge pipeline and a second sludge pipeline, and the electric valve comprises a first electric valve arranged in the first sludge pipeline and a second electric valve arranged in the second sludge pipeline; The sludge agitator on the opposite side of the lower part of the intelligent sludge storage tank is communicated with the lower part of the sludge pump tank through the first sludge pipeline, and the upper part is communicated with the upper part of the sludge pump tank through the second sludge pipeline.

2. The intelligent sludge concentration system according to claim 1, wherein, The water inlet pump house, the grit chamber, the biochemical tank and the secondary sedimentation tank are connected through a wastewater pipeline; The secondary sedimentation tank, the sludge pump tank and the biochemical tank are connected through a sludge pipeline.

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