CN213895342U - Device for controlling coking biochemical effluent deep denitrification - Google Patents
Device for controlling coking biochemical effluent deep denitrification Download PDFInfo
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- CN213895342U CN213895342U CN202022600344.XU CN202022600344U CN213895342U CN 213895342 U CN213895342 U CN 213895342U CN 202022600344 U CN202022600344 U CN 202022600344U CN 213895342 U CN213895342 U CN 213895342U
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Abstract
The utility model discloses a device for controlling deep denitrification of coking biochemical effluent, which comprises a control cabinet, a denitrification tank, an MBR tank, a necessary pump and a necessary flowmeter; the methanol tank, the sodium acetate tank and the biochemical effluent pool are communicated with a pipeline mixer, and the outlet of the pipeline mixer is communicated with the denitrification tank; the biochemical water outlet pool is connected with a total nitrogen on-line instrument and a nitric acid nitrogen on-line tester; the control signal line is connected with the control cabinet and is connected with each sensor; the denitrification tank is provided with an anoxic tank water inlet baffle plate, one side of the denitrification tank is provided with a mud-water separator, and the first connecting pipe is connected with the denitrification tank and the mud-water separator; one side of the sludge-water separator is provided with an MBR tank, the second connecting pipe is connected with the sludge-water separator and the MBR tank, and an MBR membrane and an air nozzle are arranged in the MBR tank; the outlet of the MBR tank is communicated with the water outlet tank. The device of the utility model can deeply remove nitrate nitrogen and nitrite nitrogen in the coking wastewater and meet the effluent total nitrogen standard.
Description
Technical Field
The utility model relates to a water treatment field, concretely relates to coking biochemical effluent degree of depth denitrogenation's controlling means.
Background
Coking wastewater is from coking and coal gas production, the water quality is complex, and the coking wastewater yield is large.
The nitrogen-containing compounds in the coking wastewater are divided into inorganic compounds and organic compounds. Inorganic nitrogen mainly includes ammonia, cyanide, thiocyanide, nitrate, nitrite and a small amount of dissolved gaseous nitrogen oxides. The organic nitrogen includes a nitrogen-containing heterocyclic compound. Because of the large amount of nitrogen-containing compounds in the coking wastewater, the nitrogen source required by biological treatment is excessive.
With the continuous aggravation of environmental water eutrophication procedures, the emission standard of nitrogen-containing compounds in sewage is correspondingly improved, the emission limits of ammonia nitrogen and cyanide are reduced from 15mg/l and 0.5mg/l to 10mg/l and 0.2mg/l according to the emission standard of pollutants for coking chemical industry (GB16171-2012) implemented in 2012, the emission requirement is improved, the emission limit of total nitrogen (20mg/l) is increased, and many coking enterprises face technical and economic challenges.
The denitrification process of the coking wastewater mainly comprises A/O, A2/O、A/O2And the A/O process is a basic biological denitrification process, ammonia nitrogen in the aerobic tank is oxidized into nitrate nitrogen and nitrite nitrogen through a nitration reaction, and pre-denitrification is realized through backflow and regulation of sludge and supernatant, so that the aim of denitrification is fulfilled.
The COD in the biochemical effluent of the coking wastewater is 200-300mg/l, and the part of the COD is difficult to be biochemically degraded; the total nitrogen is in the range of 80-200mg/l, wherein the nitrate nitrogen accounts for 85-92%, the nitrite nitrogen accounts for 0.1-3.0%, the ammonia nitrogen accounts for 0.1-0.5%, and the organic nitrogen accounts for 3.0-5.0%, so that the part of the total nitrogen needs to be removed, a carbon source needs to be added, and the total nitrogen is removed through denitrification.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, a biochemical device that goes out water degree of depth denitrogenation of accurate control coking can be got rid of nitrate nitrogen and nitrite nitrogen degree of depth in the coking wastewater, satisfies the total nitrogen standard of play water.
The technical scheme of the utility model is that the device for controlling the deep denitrification of the coking biochemical effluent comprises a control cabinet, a denitrification tank, an MBR tank, a necessary pump and a necessary flowmeter;
the methanol tank and the sodium acetate tank are communicated with a pipeline mixer, the biochemical effluent pool is communicated with the pipeline mixer through a water inlet pump, and the outlet of the pipeline mixer is communicated with the denitrification tank; the biochemical water outlet pool is connected with a total nitrogen on-line instrument and a nitric acid nitrogen on-line tester; the water inlet pool dissolved oxygen sensor is arranged in the biochemical water outlet pool; the control signal line is connected with the control cabinet and is connected with each sensor;
the denitrification tank is provided with an anoxic tank water inlet baffle plate, one side of the denitrification tank is provided with a mud-water separator, and a first connecting pipe is connected with the denitrification tank and the mud-water separator; one side of the sludge-water separator is provided with an MBR tank, the second connecting pipe is connected with the sludge-water separator and the MBR tank, and an MBR membrane and an air nozzle are arranged in the MBR tank; and the outlet of the MBR tank is communicated with the water outlet tank.
According to the device for controlling the deep denitrification of the coking effluent, a methanol metering pump is arranged on an outlet pipeline of the methanol tank; and a sodium ethoxide metering pump is arranged on an outlet pipeline of the sodium ethoxide tank.
According to the device for controlling the deep denitrification of the coking effluent, an anoxic tank dissolved oxygen sensor is arranged on the denitrification tank.
According to the device for controlling the deep denitrification of the coking and biochemical effluent, the MBR tank is connected with a dissolved oxygen meter.
According to the device for controlling the advanced denitrification of the coking effluent, the water inlet baffle of the anoxic pond is positioned in the first grid of the denitrification pond.
According to the device for controlling the deep denitrification of the coking effluent, the MBR tank is internally connected with a fan. The fan is connected with a nozzle in the denitrification tank and is connected with a corresponding flowmeter and a pipeline.
According to the device for controlling the deep denitrification of the coking effluent, the denitrification tank is provided with a stirring device.
According to the device for controlling the deep denitrification of the coking effluent, an inclined plate is arranged at the upper part in the sludge-water separator. Namely a sludge hopper is arranged below the inclined plate.
According to the device for controlling the advanced denitrification of the coking effluent, the air nozzle is arranged below the MBR membrane. The air nozzles are arranged in a row and a plurality of air nozzles.
Has the advantages that:
the device is a process and a device for deep denitrification by applying coking biochemical effluent, can realize deep denitrification of coking effluent, and has high denitrification rate up to 97.5%.
In addition, the device can realize real-time calculation and automatic control of the amount of the added carbon source, and can effectively reduce the amount of the carbon source compared with the traditional process.
The device can meet the requirements of upgrading and transforming coking wastewater denitrification, and meets the discharge standards in table 2 and table 3 in GB16171-2012 coking chemical industrial pollutant discharge standard.
1. The control cabinet carries out statistics collection to the signal in the system to increase signal feedback control system, realize automatic, accurate control.
2. Controlling the injection amount of the carbon source. A plurality of field instrument data (biochemical effluent DO, nitrate nitrogen, total nitrogen and inflow flow) are collected on the field, a methanol and sodium acetate metering pump (stroke controller) is controlled, the flow of a carbon source reaches a calculated value, and the carbon source is saved compared with the actual field manual regulation.
3. A pipeline mixer. Injecting carbon source, mixing methanol and sodium acetate sufficiently by using a pipeline mixer, and facilitating the subsequent denitrification reaction.
4. The carbon source ratio can be set. The proportion of methanol and sodium acetate can be selected according to the process condition (biochemical microorganism growth) of the system. After stable operation, the methanol ratio can be increased, and the carbon source cost is lower.
5. A denitrification tank. The baffle is added to the inlet water, so that the short-flow influence can be reduced, and the wastewater is ensured to be fully reacted and denitrified; the water outlet of the denitrification tank is connected to a mud-water separation tank by a connecting pipe, so that the supernatant is ensured to reach the subsequent process, and the outflow of sludge is reduced.
6. A mud-water separator. The inclined plate is adopted to efficiently intercept sludge. The water outlet of the separator is connected to the MBR denitrification reaction tank by a connecting pipe, so that the disturbance to the subsequent process is reduced, and the outflow of sludge can be reduced.
7. And (4) performing MBR deep denitrification. The diversity of the microbial community on the surface of the MBR membrane is efficiently utilized, and the efficient deep denitrification under the condition of high-concentration sludge can be realized.
8. The accurate aeration rate of air system. The pneumatic regulating valve and the MBR denitrification dissolved oxygen are subjected to chain tracking, and the concentration of the dissolved oxygen in the MBR deep denitrification tank can be controlled.
9. An air nozzle. An air nozzle is added at the bottom of the MBR membrane, so that a blowing nozzle and disturbance can be carried out on the MBR membrane, and certain blowing-off can be carried out on the microbial flocs adhered to the surface of the MBR membrane.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1-control cabinet; 2-methanol metering pump; 3-sodium acetate metering pump; 4-total nitrogen on-line instrument; 5-nitric acid nitrogen on-line measuring instrument; 6-water intake pool dissolved oxygen sensor; 7-a line mixer; 8-control signal lines; 9-a dissolved oxygen sensor in the anoxic tank; 10-a first connection pipe; 11-a sloping plate; 12-a second connecting tube; 13-a mud-water separator; 14-sludge reflux flow meter; 15-dissolved oxygen instrument; 16-MBR membrane; 17-an air flow meter; 18-an air nozzle; 19-a water inlet baffle plate of the anoxic pond; 20-methanol tank; 21-sodium acetate tank; 22-biochemical effluent pool; 23-a denitrification tank; 24-MBR tank; 25-water outlet pool; 26-a fan; 27-a water inlet pump; 28-sludge reflux pump; 29-self priming pump.
Detailed Description
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.
As shown in figure 1, the device for controlling the advanced nitrogen removal of coking biochemical effluent mainly comprises a control cabinet 1, a denitrification tank 23 and an MBR tank 24.
The control cabinet 1 collects and controls the related parameters of the denitrification process. The acquisition signals are as follows: a total nitrogen online instrument 4, a nitric acid nitrogen online measuring instrument 5, a water inlet pool dissolved oxygen 6 and a denitrification water inlet flow meter FICA-01; a dissolved oxygen sensor 9 in the anoxic tank,
the computer analyzes the collected signals, calculates the amount of the carbon source required to be added, and feeds back the signals to the methanol and sodium acetate metering pump for controlling the flushing so as to enable the flow rates of the carbon source amount FICA-02 and the FICA-03 to reach the calculated values.
The control method comprises the following steps: a methanol and sodium acetate metering pump stroke controller, a sodium acetate flowmeter FICA-02 and a methanol flowmeter FICA-03;
the methanol tank 20 and the sodium acetate tank 21 are communicated with the pipeline mixer 7, the biochemical effluent pool 22 is communicated with the pipeline mixer 7 through an inlet pump 27, and the outlet of the pipeline mixer 7 is communicated with the denitrification tank 23; the biochemical water outlet pool 22 is connected with a total nitrogen on-line instrument 4 and a nitric acid nitrogen on-line tester 5; the water inlet pool dissolved oxygen sensor 6 is arranged in the biochemical effluent pool 22. The control signal line 8 is connected with the control cabinet 1 and connected with each sensor.
Denitrification denitrification system
The system can completely mix the waste water with the waste water, and realize the purpose of denitrogenating nitrate nitrogen and nitrite nitrogen under the satisfied conditions.
After the coking wastewater effluent is lifted by the water inlet pump, the carbon sources of methanol and sodium acetate are completely mixed with the wastewater by the pipeline mixer 7 and then enter the denitrification tank 23. A baffle plate, namely the water inlet baffle plate 19 of the anoxic tank is arranged in the first grid in the denitrification tank 23, so that the full contact reaction of wastewater and a carbon source can be realized, and the wastewater short flow is reduced. The wastewater and the carbon source enter a denitrification tank 23, and the denitrification work fully reacts with nitrate nitrogen and nitrite nitrogen under the stirring action to generate nitrogen, so that the nitrogen is removed. The denitrified wastewater enters a sludge-water separator 13 through a first connecting pipe 10. A sludge-water separator 13 is arranged on one side of the denitrification tank 23, and the first connecting pipe 10 is connected with the denitrification tank 23 and the sludge-water separator 13; an MBR tank 24 is arranged on one side of the sludge-water separator 13, the second connecting pipe 12 is connected with the sludge-water separator 13 and the MBR tank 24, and an MBR membrane 16 and an air nozzle 18 are arranged in the MBR tank 24; the outlet of the MBR tank is communicated with a water outlet tank 25.
In the mud-water separator, an inclined plate 11 is arranged, sludge is deposited in the mud and flows back to a water inlet of the denitrification tank through a sludge return pump 28, and upper clarified wastewater flows to an MBR tank 24 through a second connecting pipe 12. The sludge reflux amount can be adjusted according to the MLSS sludge concentration of the denitrification tank, the water inlet flow of a reflux flowmeter 14(FICA-04) is controlled, and the sludge concentration of the denitrification tank is controlled.
MBR (membrane bioreactor) deep denitrification system
The wastewater entering the MBR tank 24 through the second connecting pipe 12 is subjected to deep denitrification under the action of the MBR membrane 16. The wastewater enters the water outlet tank 25 through the MBR membrane 16 by the self-priming pump 29, and the water in the water outlet tank 25 can be subjected to advanced treatment or discharged after reaching the standard.
The MBR deep denitrification system is internally provided with an MBR membrane 16 and a fan aeration system (a fan 26, an air nozzle 18, an air flow meter 17 and an air flow regulating valve), wherein the fan is a Roots compressor.
MBR advanced denitrification utilizes MBR membrane surface microorganism to gather different communities, and different microorganisms (nitrification activity, denitrifying bacteria and the like) on the membrane surface carry out the advanced reaction to ammonia nitrogen, nitrate and nitrite nitrogen in the waste water and get rid of, and organic nitrogen can be got rid of through the microorganism adsorption mode to wherein simultaneously.
The fan aeration system can carry out microbial oxidation degradation on the easily degradable organic matters in the residual part in the effluent of the denitrification tank, and meanwhile, the air passing through the air nozzle can disturb the MBR membrane filaments to blow off the deposited flocs on the surface of the membrane filaments.
The air flow meter 17 of the fan aeration system is interlocked with the dissolved oxygen meter 15, and the air electric regulating valve is used for tracking and can effectively control the concentration of Dissolved Oxygen (DO) and the concentration of sludge in the MBR tank.
Claims (9)
1. The utility model provides a device of control coking biochemical play water degree of depth denitrogenation which characterized in that: comprises a control cabinet (1), a denitrification tank (23), an MBR tank (24) and necessary pumps and flow meters;
the methanol tank (20) and the sodium acetate tank (21) are communicated with the pipeline mixer (7), the biochemical effluent pool (22) is communicated with the pipeline mixer (7) through a water inlet pump, and the outlet of the pipeline mixer (7) is communicated with the denitrification tank (23); the biochemical water outlet pool (22) is connected with a total nitrogen online instrument (4) and a nitric acid nitrogen online tester (5); the water inlet pool dissolved oxygen sensor (6) is arranged in the biochemical water outlet pool (22); the control signal line (8) is connected with the control cabinet (1) and is connected with each sensor;
the denitrification tank (23) is provided with an anoxic tank water inlet baffle plate (19), one side of the denitrification tank (23) is provided with a mud-water separator (13), and the first connecting pipe (10) is connected with the denitrification tank (23) and the mud-water separator (13); an MBR tank (24) is arranged on one side of the mud-water separator (13), the second connecting pipe (12) is connected with the mud-water separator (13) and the MBR tank (24), and an MBR membrane (16) and an air nozzle (18) are arranged in the MBR tank; the outlet of the MBR tank (24) is communicated with the water outlet tank (25).
2. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: a methanol metering pump (2) is arranged on the outlet pipeline of the methanol tank; and a sodium acetate metering pump (3) is arranged on the outlet pipeline of the sodium acetate tank.
3. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: an oxygen deficiency tank dissolved oxygen sensor (9) is arranged on the denitrification tank (23).
4. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: the MBR tank (24) is connected with a dissolved oxygen meter (15).
5. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: the anoxic tank water inlet baffle plate (19) is positioned in a first grid of the denitrification tank (23).
6. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: the MBR tank (24) is connected with a fan (26).
7. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: the denitrification tank (23) is provided with a stirring device.
8. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: an inclined plate (11) is arranged at the upper part in the mud-water separator (13).
9. The device for controlling coking biochemical effluent deep denitrification according to claim 1, characterized in that: the air nozzle (18) is disposed below the MBR membrane (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022600344.XU CN213895342U (en) | 2020-11-11 | 2020-11-11 | Device for controlling coking biochemical effluent deep denitrification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022600344.XU CN213895342U (en) | 2020-11-11 | 2020-11-11 | Device for controlling coking biochemical effluent deep denitrification |
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| CN213895342U true CN213895342U (en) | 2021-08-06 |
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