CN103739074A - Sewage treatment method of A-A2O biological tank - Google Patents
Sewage treatment method of A-A2O biological tank Download PDFInfo
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- CN103739074A CN103739074A CN201410031613.1A CN201410031613A CN103739074A CN 103739074 A CN103739074 A CN 103739074A CN 201410031613 A CN201410031613 A CN 201410031613A CN 103739074 A CN103739074 A CN 103739074A
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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, is a kind of biological treatment tank of the A-A2O of employing sewage treatment process, and A-A2O sewage treatment process refers to, the technique that sewage carries out 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 few Ultra-low load operation of flooding quantity, because entering organic matter of water concentration is seriously on the low side, cause system activity mud owing to lacking nutritive substance activity decreased.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 that anti-nitration reaction is required, nitric nitrogen can not normally reduce, and affects total nitrogen removal effect.
Therefore when A-A2O biological tank is during in ultra-low load, low carbon source flow condition, have the defect that total nitrogen total phosphorus clearance is low, water outlet is difficult to up to standard continually and steadily, causes the normal operation energy waste of biological tank larger simultaneously.
Therefore be necessary to consider the sewage water treatment method of a kind of A-A2O of meeting biological tank of research when ultra-low load, low carbon source flow condition, reach and improve total nitrogen total phosphorus clearance and realize the continual and steady up to standard and energy-saving and cost-reducing effect of water outlet.
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, can meet the A-A2O biological tank sewage water treatment method of the wastewater treatment efficiency of A-A2O biological tank when ultra-low load, low carbon source flow condition, reach and improve total nitrogen total phosphorus clearance and realize the continual and steady up to standard and energy-saving and cost-reducing effect of water outlet.
In order to solve the problems of the technologies described above, in the present invention, adopted following technical scheme:
A kind of 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 stop Inlet and outlet water and stir for some time active sludge is fully mixed, carry out anti-nitration reaction; Then open aerator period of aeration and carry out nitration reaction; Finally stopping period of aeration carrying out again repeating Inlet and outlet water circulation after anti-nitration reaction again.
The present invention can be specifically the following optimization step that comprises that circulation is carried out, a, water inlet water outlet are simultaneously about 40 minutes, 90% left and right of closing aerator and flooding quantity during Inlet and outlet water is dispensed into oxygen-starved area, and all the other water inlets are dispensed into selects district and anaerobic zone (to the greatest extent at utmost for denitrification provides carbon source); B, stop Inlet and outlet water, the impeller that continues to close aerator and open the each district of biological tank carried out mix and blend about 55 minutes; (still aeration not of this stage, impeller is often opened, and guarantees that carbon source fully contacts with active sludge.) c, open the aerator aeration of aerobic zone about 75 minutes, aeration Shi Ge district impeller continues to open; (within the short as far as possible time, promote nitration reaction, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage D O is adjusted according to water outlet ammonia nitrogen in good time); D, stop aeration, continue to open each district impeller mix and blend and carry out a step circulation after about 70 minutes.So take about 4 hours as a loop cycle operation.
In such scheme, specifically, wherein ultra-low load, low carbon source refer to the situation that flooding quantity load is less than 10%, carbon-nitrogen ratio is less than at 3 o'clock.In this treatment process, in a step, 90% of aeration and flooding quantity do not distribute and enter anoxic section, to the greatest extent at utmost for denitrification provides carbon source.In b step, carry out mix and blend, still aeration not of this stage, impeller is often opened, and guarantees that carbon source fully contacts with active sludge.In c step, open the aerator aeration 75 minutes of aerobic zone, aeration Shi Ge district impeller continues to open; Can within the short as far as possible time, promote nitration reaction like this, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage D O simultaneously can be adjusted according to water outlet ammonia nitrogen in good time.In d step, stop aeration, continue to open each district impeller mix and blend 70 minutes, for anti-nitration reaction, create the environment of low dissolved oxygen, guarantee that whole biological tank, in anoxic condition, also comprises aerobic zone, realize good anti-nitration reaction.
Like this, utilize existing A-A2O biological tank in present method, by adjusting process process, adopt the water treatment principle of SBR intermittent water inflow and intermittent aeration pattern, the water treatment while having realized ultra-low load, low carbon source flow condition, makes its water outlet up to standard.
As the one optimization of such scheme, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel's detection of biological pond water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjust the aeration rate in this circulation b step, dissolved oxygen is controlled to 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled to 1.0-1.5mg/L; Make the water outlet ammonia nitrogen value of next circulation be controlled at 2-4mg/L.
After optimizing like this, can as the case may be, detect in real time regimen condition, by the dynamic regulation to aeration rate, guarantee treatment effect, realize effluent quality up to standard.
As the one optimization of such scheme, during d step end, detect the nitrate nitrogen content of selecting district, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the flooding quantity that regulates in time biological selecting area, anaerobic zone and oxygen-starved area, flooding quantity when nitrate nitrogen content compare Gao strengthens in district next circulation a step tends to balance nitrate nitrogen content with supplementary carbon source.
After optimizing like this, by real-time detection, dynamically adjust flooding quantity, to guarantee that the carbon source in each district is supplemented, nitrate nitrogen content is tended to balance, guarantee the balance of each district reaction, guarantee better treatment effect.
As another, optimize, in whole working cycle, aerobic zone is opened one to the internal reflux pump of oxygen-starved area, and quantity of reflux is controlled at 60-70%.Like this, can make the nitric nitrogen in aerobic zone be back to anaerobic zone processing, avoid again aerobic zone to bring a large amount of dissolved oxygens into simultaneously and enter oxygen-starved area with too much mixed solution, shorten the hydraulic detention time of oxygen-starved area, affect anti-nitration reaction.
As another optimization, in whole working cycle, sludge reflux pump house is opened one to the outer pump that flows back between water inlet skip-cage combination shaft, and quantity of reflux is controlled at 60-70% left and right.In time the returned sluge of second pond is added in system in time like this, on the one hand; On the other hand, avoid the sewage that is too much rich in a large amount of nitrate to enter anaerobic zone, disturbed the release of phosphorus.
In sum, the present invention can meet the wastewater treatment efficiency of A-A2O biological tank when ultra-low load, low carbon source flow condition, there is easy to operate, easy to implement advantage, reached and improved total nitrogen total phosphorus clearance and realize the continual and steady up to standard and energy-saving and cost-reducing effect of water outlet; Be particularly suitable for guaranteeing 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 adopts while specifically implementing of the present invention.
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, to implement on the basis of common A-A2O biological tank, it can be specifically A-A2O biological tank (in figure, arrow represents to flow to) as shown in Figure 1, in this biological tank, there is the selection district 1, anaerobic zone 2, oxygen-starved area 3 and the aerobic zone 4 that join successively and be communicated with, inside, each district is provided with impeller 5, in aerobic zone 4, be also provided with aerating apparatus (aeration can adopt gas blower to pass into tracheae and realize aeration in aerobic zone), between aerobic zone 4 and oxygen-starved area 3, be provided with internal reflux pump and vacuum breaker; Inlet channel 6 enters into respectively anaerobic zone 2 and a skip-cage combination shaft 7, skip-cage combination shaft 7 also has access to the sludge return pipe 8 from sludge reflux pump house, on sludge return pipe 8, be provided with external reflux pump, skip-cage combination shaft 7 is connected with oxygen-starved area 3 and realizes water inlet with selection district 1 respectively by two pipelines, and 4 connected water outlet pipe roads, aerobic zone carry out water outlet.Wherein select 520 cubic metres of single pond, district useful volumes, 1562 cubic metres of single pond, anaerobic zone useful volumes, 3125 cubic metres of single pond, oxygen-starved area useful volumes, 9010 cubic metres of single pond, aerobic zone useful volumes.
Present method is particularly suitable for being not more than 10% at biological tank flooding quantity load, carbon-nitrogen ratio is less than in the situation of 3 situation to be implemented, during concrete enforcement, following steps are carried out in circulation, a, water inlet water outlet simultaneously 40 minutes, during Inlet and outlet water, close 90% of aerator and flooding quantity and be dispensed into oxygen-starved area, all the other water inlets are dispensed into selects district and anaerobic zone (to the greatest extent at utmost for denitrification provides carbon source); B, stop Inlet and outlet water, the impeller that continues to close aerator and open the each district of biological tank carries out mix and blend 55 minutes; (still aeration not of this stage, 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 short as far as possible time, promote nitration reaction, for subsequent processing anti-nitration reaction provides enough nitric nitrogens, the control of this stage D O is adjusted according to water outlet ammonia nitrogen in good time); D, stop aeration, continue to open each district impeller mix and blend and after 70 minutes, carry out a step circulation.(for anti-nitration reaction, create the environment of low dissolved oxygen, guarantee that whole biological tank, in anoxic condition, also comprises aerobic zone)-enter (going out) water, so take 4 hours as a loop cycle operation.
When present method is implemented, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel's detection of biological pond water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjust the aeration rate in this circulation b step, dissolved oxygen is controlled to 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled to 1.0-1.5mg/L; Make the water outlet ammonia nitrogen value of next circulation be controlled at 2-4mg/L.
When present method is implemented, during d step end, detect the nitrate nitrogen content of selecting district, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the flooding quantity that regulates in time biological selecting area, anaerobic zone and oxygen-starved area, flooding quantity when nitrate nitrogen content compare Gao strengthens in district next circulation a step tends to balance nitrate nitrogen content with supplementary carbon source.
When present method is implemented, in whole working cycle, aerobic zone is opened one to the internal reflux pump of oxygen-starved area, and quantity of reflux is controlled at 60-70%.Like this, can make the nitric nitrogen in aerobic zone be back to anaerobic zone processing, avoid again aerobic zone to bring a large amount of dissolved oxygens into simultaneously and enter oxygen-starved area with too much mixed solution, shorten the hydraulic detention time of oxygen-starved area, affect anti-nitration reaction.
When present method is implemented, in whole working cycle, sludge reflux pump house is opened one to the outer pump that flows back between water inlet skip-cage combination shaft, and quantity of reflux is controlled at 60-70% left and right.In time the returned sluge of second pond is added in system in time like this, on the one hand; On the other hand, avoid the sewage that is too much rich in a large amount of nitrate to enter anaerobic zone, disturbed the release of phosphorus.
In present method, by A-A2O process using SBR intermittent water inflow and intermittent aeration pattern, strengthen the ammonia nitrogen of biological tank water outlet is detected to frequency, according to the variation of ammonia nitrogen value, regulate the dissolved oxygen of biological tank aerobic section, improve the activity of system activity mud; By the distribution situation of the each section of nitric nitrogen in detection of biological every day pond, regulate the flooding quantity of biological selecting area, anaerobic zone and oxygen-starved area, supplement in time the required carbon source of denitrification, 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 is comprehensively up to standard, total nitrogen, total tp removal rate are increased to 70%, go out water number and be controlled at 13mg/L and 0.7mg/L left and right, compared with significantly improving before technique adjustment, ammonia nitrogen removal frank is stable to be reached more than 90%.Simultaneously, present method is by aeration time is regulated, and for greatly shortening the working time of the gas blower of aeration, 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 by regulating front every day 300kg to be down to 200kg.Its direct benefit: by every day current consumption before adjusting compared with technique, save 1500 degree and calculate, estimates can save for 1 year power consumption 540,000 degree, 480,000 yuan of running costs of saving; Dephosphorization agent consumption reduces 100kg average every day, estimates within 1 year, to save 36 tons of dephosphorization agents, 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, has particularly guaranteed steady running in winter qualified discharge.Can improve the reduction of total nitrogen total phosphorus, for reducing discharging, contribute.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 (Inlet and outlet water simultaneously) of A-A2O technique and the interruption Inlet and outlet water feature of SBR technique, changes existing operation scheme into permanent water level SBR operation scheme.2. according to the variation of biological tank water outlet ammonia nitrogen value, carry out dissolved oxygen interlock and control 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 to greatest extent carbon source.4. can, according to the flooding quantity of profile adjustment biological selecting area, anaerobic zone and the oxygen-starved area of the each section of nitric nitrogen in detection of biological pond, supplement in time the required carbon source of denitrification.Like this, by process adjustments of the present invention, can reduce running cost; Guarantee that water outlet nitrogen phosphorus index is up to standard continually and steadily, particularly guaranteed steady running in winter qualified discharge; Improve the reduction of total nitrogen total phosphorus, for reducing discharging, contribute; And process adjustments is without extra investment, and treatment effect promotes obviously, can under other ultra-low loads, low carbon source condition, be applicable.
Claims (6)
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 stop Inlet and outlet water and stir for some time active sludge is fully mixed, carry out anti-nitration reaction; Then open aerator period of aeration and carry out nitration reaction; Finally stopping period of aeration carrying out again repeating Inlet and outlet water circulation after anti-nitration reaction again.
2. A-A2O biological tank sewage water treatment method as claimed in claim 1, it is characterized in that, specifically comprise the following steps that circulation is carried out, a, water inlet water outlet simultaneously 40 minutes, during Inlet and outlet water, close 90% of aerator and flooding quantity and be dispensed into oxygen-starved area, all the other water inlets are dispensed into selects district and anaerobic zone; B, stop Inlet and outlet water, the impeller that continues to close aerator and open the 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, stop aeration, continue to open each district impeller mix and blend and after 70 minutes, carry out a step circulation.
3. A-A2O biological tank sewage water treatment method as claimed in claim 2, it is characterized in that, in a step during biological tank Inlet and outlet water 20 minutes, laboratory personnel's detection of biological pond water outlet ammonia nitrogen value, when ammonia nitrogen value is greater than 4mg/L, adjust the aeration rate in this circulation b step, dissolved oxygen is controlled to 1.3-1.8mg/L, when biological tank water outlet ammonia nitrogen value is less than 2, dissolved oxygen is controlled to 1.0-1.5mg/L; Make the water outlet ammonia nitrogen value of next circulation be controlled at 2-4mg/L.
4. A-A2O biological tank sewage water treatment method as claimed in claim 2, it is characterized in that, during d step end, detect the nitrate nitrogen content of selecting district, anaerobic zone and oxygen-starved area, according to the distribution situation of nitric nitrogen, the flooding quantity that regulates in time biological selecting area, anaerobic zone and oxygen-starved area, flooding quantity when nitrate nitrogen content compare Gao strengthens in district next circulation a step tends to balance nitrate nitrogen content with supplementary carbon source.
5. A-A2O biological tank sewage water treatment method as claimed in claim 2, is characterized in that, in whole working cycle, aerobic zone is opened one to the internal reflux pump of oxygen-starved area, and quantity of reflux is controlled at 60-70%.
6. A-A2O biological tank sewage water treatment method as claimed in claim 2, is characterized in that, in whole working cycle, sludge reflux pump house is opened one to the external reflux pump between water inlet skip-cage combination shaft, and quantity of reflux is controlled at 60-70% left and right.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105601030A (en) * | 2015-12-19 | 2016-05-25 | 湖南科技大学 | Cycle sequencing batch operation sewage treatment plant and technology |
| CN105819572A (en) * | 2016-05-12 | 2016-08-03 | 沈阳建筑大学 | Continuous water feeding 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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| 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 |
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Patent Citations (4)
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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 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105601030A (en) * | 2015-12-19 | 2016-05-25 | 湖南科技大学 | Cycle sequencing batch operation sewage treatment plant and technology |
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| CN105819572A (en) * | 2016-05-12 | 2016-08-03 | 沈阳建筑大学 | Continuous water feeding sequence bioreactor and control method |
| 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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