CN103739074B - Sewage treatment method of A-A2O biological tank - Google Patents
Sewage treatment method of A-A2O biological tank Download PDFInfo
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- CN103739074B CN103739074B CN201410031613.1A CN201410031613A CN103739074B CN 103739074 B CN103739074 B CN 103739074B CN 201410031613 A CN201410031613 A CN 201410031613A CN 103739074 B CN103739074 B CN 103739074B
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Abstract
The invention discloses a sewage treatment method of an A-A2O biological tank, which is characterized by comprising the steps of synchronously feeding and discharging water for the biological tank for a certain period of time to finish water replacement; stopping the water feed and discharge, stirring for a certain period of time to sufficiently mix the active sludge, and performing denitrification reaction; starting aeration equipment and aerating for a certain period of time, and performing nitration reaction; finally, stopping the aeration for a certain period time, performing denitrification reaction again, and repeatedly feeding and discharging water and circulating. The method disclosed by the invention can realize a sewage treatment effect under the conditions of ultralow load and low-carbon source water feed of the A-A2O biological tank, has the advantages of convenience in operation and easiness in implementation, improves the total nitrogen and total phosphorus removal rate, realizes the effects of continuous, stable and up-to-standard water output and energy saving and consumption reduction, and is particularly suitable for guaranteeing stable operation of the A-A2O biological tank in winter.
Description
Technical field
The present invention relates to the sewage disposal technology in a kind of sewage work, especially a kind of A-A2O biological tank sewage water treatment method.
Background technology
A-A2O biological tank, be a kind of biological treatment tank adopting A-A2O sewage treatment process, A-A2O sewage treatment process refers to, sewage carries out the technique of sewage disposal through the treating pond of the operations such as pre-anoxic-anaerobic-anoxic-oxic.During its conventional operation, there is good wastewater treatment efficiency.
But A-A2O biological tank is when the Ultra-low load operation that flooding quantity is few, because entering organic matter of water concentration is seriously on the low side, activity reduces owing to lacking nutritive substance to cause system activity mud.Simultaneously the operation scheme of the former continuous aeration of A-A2O biological tank makes active sludge cause autoxidation because of organism wretched insufficiency.And entering organic matter of water concentration is on the low side, the carbon source wretched insufficiency needed for anti-nitration reaction, nitric nitrogen can not normal reduction, affects total nitrogen removal effect.
Therefore when A-A2O biological tank is in ultra-low load, low-carbon-source flow condition, there is the defect that total nitrogen total phosphorus clearance is low, water outlet is difficult to up to standard continually and steadily, cause the normal operation energy waste of biological tank larger simultaneously.
Therefore be necessary that considering that research is a kind of meets the sewage water treatment method of A-A2O biological tank when ultra-low load, low-carbon-source flow condition, reaches and improves total nitrogen total phosphorus clearance and realize water outlet effect up to standard and energy-saving and cost-reducing continually and steadily.
Summary of the invention
For the deficiencies in the prior art, technical problem to be solved by this invention is, how to provide easy to operate, easy to implement, the A-A2O biological tank sewage water treatment method of wastewater treatment efficiency when A-A2O biological tank is in ultra-low load, low-carbon-source flow condition can be met, reach and improve total nitrogen total phosphorus clearance and realize water outlet effect up to standard and energy-saving and cost-reducing continually and steadily.
In order to solve the problems of the technologies described above, in the present invention, have employed following technical scheme:
A kind of A-A2O biological tank sewage water treatment method, it is characterized in that, biological tank is intake and water outlet for some time simultaneously, completes water yield displacement; Then stopping Inlet and outlet water carrying out stirring for some time makes active sludge fully mix, and carries out anti-nitration reaction; Then open aerator period of aeration and carry out nitration reaction; Again repeat Inlet and outlet water after finally stopping period of aeration again to carry out anti-nitration reaction and circulate.
The present invention can be specifically the following optimization step comprising circulation execution, a, water inlet water outlet about 40 minutes simultaneously, close aerator during Inlet and outlet water and about 90% of flooding quantity be dispensed into oxygen-starved area, all the other water inlets are dispensed into selection area and anaerobic zone (to the greatest extent at utmost for denitrification provides carbon source); B, stop Inlet and outlet water, continue to close aerator and the impeller opening each district of biological tank carries out mix and blend about 55 minutes; (this stage still not aeration, impeller is often opened, and guarantees that carbon source fully contacts with active sludge.) c, open the aerator aeration about 75 minutes of aerobic zone, aeration Shi Ge district impeller continues to open; (within the time short as far as possible, promote nitration reaction, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage DO adjusts according to water outlet ammonia nitrogen in good time); D, stopping aeration, continue to open each district impeller mix and blend and carry out a step after about 70 minutes and circulate.Like this is that a loop cycle is run with 4 hours.
In such scheme, specifically, situation when wherein ultra-low load, low-carbon-source refer to that flooding quantity load is less than 10%, carbon-nitrogen ratio is less than 3.In treatment method, not aeration and 90% of flooding quantity distribute and enter anoxic section, to the greatest extent at utmost for denitrification provides carbon source in a step.Carry out mix and blend in b step, this stage still not aeration, impeller is often opened, and guarantees that carbon source fully contacts with active sludge.Open the aerator aeration 75 minutes of aerobic zone in step c, aeration Shi Ge district impeller continues to open; Can promote nitration reaction within the time short as far as possible like this, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage DO simultaneously can adjust according to water outlet ammonia nitrogen in good time.Stop aeration in Step d, continue to open each district impeller mix and blend 70 minutes, for anti-nitration reaction creates the environment of low dissolved oxygen, guarantee that whole biological tank is in anoxic condition, also comprise aerobic zone, realize good anti-nitration reaction.
Like this, in present method, utilize existing A-A2O biological tank, by adjusting process process, adopt the water treatment principle of SBR intermittent water inflow and intermittent aeration pattern, achieve water treatment when ultra-low load, low-carbon-source flow condition, make its standard water discharge.
As the one optimization of such scheme, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel detects biological tank water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjust the aeration rate in this circulation step c, dissolved oxygen is controlled at 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled at 1.0-1.5mg/L; The water outlet ammonia nitrogen value making next circulate controls at 2-4mg/L.
After such optimization, as the case may be, regimen condition can be detected in real time, by the dynamic regulation to aeration rate, guarantee treatment effect, realize effluent quality up to standard.
As the one optimization of such scheme, during Step d end, detect the nitrate nitrogen content of selection area, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the timely flooding quantity regulating biological selecting area, anaerobic zone and oxygen-starved area, the flooding quantity when district that nitrate nitrogen content is higher strengthens next circulation a step makes nitrate nitrogen content tend to balance with supplementary carbon source.
After such optimization, by detecting dynamic conditioning flooding quantity in real time, to guarantee that the carbon source in each district is supplemented, nitrate nitrogen content being tended to balance, guaranteeing the balance that each district reacts, guarantee treatment effect better.
Optimize as another, in whole working cycle, aerobic zone opens one to the internal reflux pump of oxygen-starved area, and quantity of reflux controls at 60-70%.Like this, the nitric nitrogen in aerobic zone can be made to be back to anaerobic zone process, simultaneously avoid again aerobic zone to bring a large amount of dissolved oxygens into and too much mixed solution enters oxygen-starved area, shorten the hydraulic detention time of oxygen-starved area, affect anti-nitration reaction.
As another optimization, in whole working cycle, the outer pump that flows back between sludge reflux pump house to water inlet skip-cage combination shaft opens one, and quantity of reflux controls at about 60-70%.Like this, one side is timely adds in system in time by the returned sluge of second pond; On the other hand, avoid the sewage being too much rich in a large amount of nitrate and enter anaerobic zone, the release of interference phosphorus.
In sum, the present invention can meet wastewater treatment efficiency when A-A2O biological tank is in ultra-low load, low-carbon-source flow condition, have easy to operate, advantage easy to implement, reach and improve total nitrogen total phosphorus clearance and realize water outlet effect up to standard and energy-saving and cost-reducing continually and steadily; Be particularly suitable for ensureing the steady running in the winter time of A-A2O biological tank.
Accompanying drawing explanation
Fig. 1 is the structural representation sketch of the biological tank that the present invention adopts when specifically implementing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A-A2O biological tank sewage water treatment method of the present invention, implement on the basis of common A-A2O biological tank, it can be specifically A-A2O biological tank (in figure, arrow represents the flow direction) as shown in Figure 1, the selection area 1 that having in this biological tank connects successively is communicated with, anaerobic zone 2, oxygen-starved area 3 and aerobic zone 4, inside, each district is provided with impeller 5, also be provided with aerating apparatus (aeration can adopt gas blower to pass in tracheae to aerobic zone and realize aeration) in aerobic zone 4, between aerobic zone 4 and oxygen-starved area 3, be provided with internal reflux pump and vacuum breaker; Inlet channel 6 enters into anaerobic zone 2 and a skip-cage combination shaft 7 respectively, skip-cage combination shaft 7 also has access to the sludge return pipe 8 from sludge reflux pump house, sludge return pipe 8 is provided with external reflux pump, skip-cage combination shaft 7 is connected with oxygen-starved area 3 with selection area 1 respectively by two pipelines and realizes intaking, and connected water outlet pipe road, aerobic zone 4 carries out water outlet.Wherein single pond, selection area useful volume 520 cubic metres, single pond, anaerobic zone useful volume 1562 cubic metres, single pond, oxygen-starved area useful volume 3125 cubic metres, single pond, aerobic zone useful volume 9010 cubic metres.
Present method is particularly suitable for being not more than 10% at biological tank flooding quantity load, implement when carbon-nitrogen ratio is less than the situation of 3, during concrete enforcement, circulation performs following steps, a, water inlet water outlet simultaneously 40 minutes, close aerator during Inlet and outlet water and 90% of flooding quantity be dispensed into oxygen-starved area, all the other water inlets are dispensed into selection area and anaerobic zone (to the greatest extent at utmost for denitrification provides carbon source); B, stop Inlet and outlet water, continue to close aerator and the impeller opening each district of biological tank carries out mix and blend 55 minutes; (this stage still not aeration, impeller is often opened, and guarantees that carbon source fully contacts with active sludge.) c, open the aerator aeration 75 minutes of aerobic zone, aeration Shi Ge district impeller continues to open; (within the time short as far as possible, promote nitration reaction, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage DO adjusts according to water outlet ammonia nitrogen in good time); D, stopping aeration, continue to open each district impeller mix and blend and carry out a step after 70 minutes and circulate.(for anti-nitration reaction creates the environment of low dissolved oxygen, guarantee that whole biological tank is in anoxic condition, also comprise aerobic zone)-enter (going out) water was so that a loop cycle is run with 4 hours.
When present method is implemented, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel detects biological tank water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjust the aeration rate in this circulation step c, dissolved oxygen is controlled at 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled at 1.0-1.5mg/L; The water outlet ammonia nitrogen value making next circulate controls at 2-4mg/L.
When present method is implemented, during Step d end, detect the nitrate nitrogen content of selection area, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the timely flooding quantity regulating biological selecting area, anaerobic zone and oxygen-starved area, the flooding quantity when district that nitrate nitrogen content is higher strengthens next circulation a step makes nitrate nitrogen content tend to balance with supplementary carbon source.
When present method is implemented, in whole working cycle, aerobic zone opens one to the internal reflux pump of oxygen-starved area, and quantity of reflux controls at 60-70%.Like this, the nitric nitrogen in aerobic zone can be made to be back to anaerobic zone process, simultaneously avoid again aerobic zone to bring a large amount of dissolved oxygens into and too much mixed solution enters oxygen-starved area, shorten the hydraulic detention time of oxygen-starved area, affect anti-nitration reaction.
When present method is implemented, in whole working cycle, the outer pump that flows back between sludge reflux pump house to water inlet skip-cage combination shaft opens one, and quantity of reflux controls at about 60-70%.Like this, one side is timely adds in system in time by the returned sluge of second pond; On the other hand, avoid the sewage being too much rich in a large amount of nitrate and enter anaerobic zone, the release of interference phosphorus.
In present method, A-A2O technique is adopted SBR intermittent water inflow and intermittent aeration pattern, strengthen and frequency is detected to the ammonia nitrogen of biological tank water outlet, regulate the dissolved oxygen of biological tank aerobic section according to the change of ammonia nitrogen value, improve the activity of system activity mud; By detecting the distribution situation of biological tank each section of nitric nitrogen every day, regulate the flooding quantity of biological selecting area, anaerobic zone and oxygen-starved area, supplement carbon source needed for denitrification in time, improve system denitrifying capacity, realize the stably reaching standard of water outlet nitrogen phosphorus index and reduce operation energy consumption.
Present method through applicant in zigzag river, Chongqing sewage work specific experiment, water outlet detected result shows, water outlet nitrogen phosphorus indices overall up to standard, total nitrogen, total tp removal rate are increased to 70%, going out water number controls at about 13mg/L and 0.7mg/L, comparatively significantly improve before technique adjustment, ammonia nitrogen removal frank is stable reaches more than 90%.Simultaneously, present method is by regulating aeration time, and the working time for the gas blower of aeration shortens greatly, and plant area's productive power is down to 5500kwh from per day power consumption 7000kwh, the range of decrease is about 21%, and dephosphorization agent consumption is down to 200kg by regulating front every day 300kg.Its direct benefit: comparatively save 1500 degree calculating before technique adjustment by current consumption every day, estimate to save power consumption 540,000 degree for 1 year, saving running cost 480,000 yuan; Dephosphorization agent consumption reduces 100kg average every day, estimates within 1 year, to save dephosphorization agent 36 tons, is roughly equal to 60,000 yuan.Its social benefit can guarantee that water outlet nitrogen phosphorus index is up to standard continually and steadily, particularly ensure that steady running in winter qualified discharge.The reduction of total nitrogen total phosphorus can being improved, contributing for reducing discharging.This process adjustments is without extra investment simultaneously, and treatment effect promotes obviously, can be applicable in other similar technique.
Innovative point of the present invention is, 1. in conjunction with the permanent water level (simultaneously Inlet and outlet water) of A-A2O technique and the interruption Inlet and outlet water feature of SBR technique, existing operation scheme is changed into permanent water level SBR operation scheme.2. carry out dissolved oxygen coordinated signals according to the change of biological tank water outlet ammonia nitrogen value and carry out the on off control of gas blower.3. can adjust working time and the circular order of three operations such as Inlet and outlet water, quiet heavy stirring, aeration in good time, make good use of carbon source to greatest extent.4. according to the flooding quantity detecting the profile adjustment biological selecting area of biological tank each section of nitric nitrogen, anaerobic zone and oxygen-starved area, carbon source needed for denitrification can be supplemented in time.Like this, regulated by present invention process, can running cost be reduced; Guarantee that water outlet nitrogen phosphorus index is up to standard continually and steadily, particularly ensure that steady running in winter qualified discharge; Improving the reduction of total nitrogen total phosphorus, contributing for reducing discharging; And process adjustments is without extra investment, treatment effect promotes obviously, can be applicable under other ultra-low loads, low-carbon-source condition.
Claims (5)
1. an A-A2O biological tank sewage water treatment method, is characterized in that, biological tank is intake and water outlet for some time simultaneously, completes water yield displacement; Then stopping Inlet and outlet water carrying out stirring for some time makes active sludge fully mix, and carries out anti-nitration reaction; Then open aerator period of aeration and carry out nitration reaction; Again repeat Inlet and outlet water after finally stopping period of aeration again to carry out anti-nitration reaction and circulate; Specifically comprise the following steps that circulation performs, a, water inlet simultaneously water outlet 40 minutes, close aerator during Inlet and outlet water and 90% of flooding quantity be dispensed into oxygen-starved area, all the other water inlets are dispensed into selection area and anaerobic zone; B, stop Inlet and outlet water, continue to close aerator and the impeller opening each district of biological tank carries out mix and blend 55 minutes; The aerator aeration of c, unlatching aerobic zone 75 minutes, aeration Shi Ge district impeller continues to open; D, stopping aeration, continue to open each district impeller mix and blend and carry out a step after 70 minutes and circulate.
2. A-A2O biological tank sewage water treatment method as claimed in claim 1, it is characterized in that, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel detects biological tank water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjusts the aeration rate in this circulation step c, dissolved oxygen is controlled at 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled at 1.0-1.5mg/L; The water outlet ammonia nitrogen value making next circulate controls at 2-4mg/L.
3. A-A2O biological tank sewage water treatment method as claimed in claim 1, it is characterized in that, during Step d end, detect the nitrate nitrogen content of selection area, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the flooding quantity of timely adjustment biological selecting area, anaerobic zone and oxygen-starved area, the flooding quantity when district that nitrate nitrogen content is higher strengthens next circulation a step makes nitrate nitrogen content tend to balance with supplementary carbon source.
4. A-A2O biological tank sewage water treatment method as claimed in claim 1, it is characterized in that, in whole working cycle, aerobic zone opens one to the internal reflux pump of oxygen-starved area, and quantity of reflux controls at 60-70%.
5. A-A2O biological tank sewage water treatment method as claimed in claim 1, is characterized in that, in whole working cycle, the external reflux pump between sludge reflux pump house to water inlet skip-cage combination shaft opens one, and quantity of reflux controls at about 60-70%.
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| CN105601030B (en) * | 2015-12-19 | 2018-09-11 | 湖南科技大学 | A kind of sewage-treatment plant and technique of the operation of cycle sequence batch |
| CN105819572B (en) * | 2016-05-12 | 2019-02-26 | 沈阳建筑大学 | Continuum micromeehanics sequence bioreactor and control method |
| CN110963632A (en) * | 2018-09-29 | 2020-04-07 | 北京京城环保股份有限公司 | Integrated treatment method for domestic sewage |
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| CN1115178A (en) * | 1993-09-30 | 1996-01-17 | 彼得·L·蒂姆坡尼 | Method and system for treatment of water and wastewater |
| CN101182074A (en) * | 2007-11-16 | 2008-05-21 | 北京工业大学 | Real-time controlling method for denitrification by reinforced circulating type active sludge process |
| CN201530769U (en) * | 2009-07-28 | 2010-07-21 | 大连迈克环境科技工程有限公司 | SBR device capable of realizing single-cycle multi-step A20 subcycle |
| CN101798156A (en) * | 2010-01-14 | 2010-08-11 | 浙江省环境保护科学设计研究院 | Process for three-cycle A2/O2 intermittent aeration biochemical nitrogen-phosphorus removing treatment |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115178A (en) * | 1993-09-30 | 1996-01-17 | 彼得·L·蒂姆坡尼 | Method and system for treatment of water and wastewater |
| CN101182074A (en) * | 2007-11-16 | 2008-05-21 | 北京工业大学 | Real-time controlling method for denitrification by reinforced circulating type active sludge process |
| CN201530769U (en) * | 2009-07-28 | 2010-07-21 | 大连迈克环境科技工程有限公司 | SBR device capable of realizing single-cycle multi-step A20 subcycle |
| CN101798156A (en) * | 2010-01-14 | 2010-08-11 | 浙江省环境保护科学设计研究院 | Process for three-cycle A2/O2 intermittent aeration biochemical nitrogen-phosphorus removing treatment |
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