CN104860476A - Technology for efficient denitrification through unpowered backflow - Google Patents
Technology for efficient denitrification through unpowered backflow Download PDFInfo
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- CN104860476A CN104860476A CN201510253067.0A CN201510253067A CN104860476A CN 104860476 A CN104860476 A CN 104860476A CN 201510253067 A CN201510253067 A CN 201510253067A CN 104860476 A CN104860476 A CN 104860476A
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Abstract
The invention discloses a technology for efficient denitrification through unpowered backflow. The technology comprises steps as follows: a, filtration by thick and thin gratings; b, aeration treatment by an adjusting tank; c, anaerobic treatment by an anaerobic tank; d, filtration by a membrane bio-reactor; e, water discharging. The technology has the characteristics of high treatment efficiency, low cost and easiness in operation; the sludge discharge quantity is small, zero discharge of organic sludge is realized, inorganic sludge is easy to recover, the treatment efficiency is improved, and resource consumption is reduced; discharged water after treatment reaches the A standard of the first level of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).
Description
Technical field
The invention belongs to sanitary sewage disposal field, be specifically related to a kind of unpowered backflow efficient denitrification technique.
Background technology
Refuse in life, sewage are one of primary pollution source of water body.Containing large amount of organic in sanitary sewage, unprocessed just directly discharge, can cause body eutrophication, so cause water hypoxia, smelly, algae grows in a large number, fish kills etc., the havoc eubiosis of water body.Domestic sewage treatment process is quite ripe at present, its core technology is activated sludge process and biomembrance process, various different domestic sewage treatment process is defined, such as oxidation ditch, A2/O, SBR, CASS etc. to the improvement of activated sludge process (or biomembrance process) and development.According to the practical situation of the water yield of sewage, water quality and water outlet requirement and locality, select rational sewage treatment process, to the normal operation of sewage disposal, processing costs, there is conclusive effect.
The Novel state Waste Water Treatment that film-bioreactor (Membrane Bio-Reactor, MBR) is membrane separation technique and biologic treating technique combination.Be a kind of new type water treatment technology combined with biological processing unit by film separation unit, replace second pond with membrane module in bio-reactor, keep high reactivity sludge concentration to reduce sewage treatment facility occupation of land, and by keeping low sludge loading to reduce sludge quantity.Active sludge in the membrane separation plant entrapping tank in aerobe pond and macromolecular solid thing are immersed in main utilization.Therefore in system, active sludge (MLSS) concentration can be promoted to 10000mg/L, sludge age (SRT) can extend to more than 30 days, can reduce biological reaction tank volume in high concentration systems like this, and the material of difficult degradation also can constantly react and degrade in treating pond.
Domestic at present have many novel procesies based on membrane bioreactor research and development, can reach discharging standards in theory, but some Process for Effluent exists the phenomenon that TN exceeds standard, and needs solution badly.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of unpowered backflow efficient denitrification technique, combines, utilize difference of altitude to realize sludge reflux with membrane bioreactor, improves nitric efficiency.
The technical solution adopted in the present invention is: a kind of unpowered backflow efficient denitrification technique, comprise equalizing tank, anoxic pond and membrane bioreactor, the position of described membrane bioreactor is higher than equalizing tank and anoxic pond, described anoxic pond is communicated with membrane bioreactor by the lift pump being arranged at its inside, aerobic area, sloping plate deposition district, film district, battery limits and region, 5, clear water zone is divided in described membrane bioreactor, the aerobic area of described membrane bioreactor is communicated with oxygen-starved area by mud return line, comprises the following steps:
A, thickness grid filtration: be 200mg/L-600mg/L, BOD5 by COD be 120mg/L-480mg/L, SS be 150mg/L-300mg/L, TN be 40mg/L-60mg/L, the sanitary sewage that ammonia nitrogen is 20mg/L-50mg/L, pH value is 6-9 is sent in equalizing tank through thick, fine fack after filtering successively;
B, equalizing tank Air Exposure: in equalizing tank, send into air, carry out homogeneous aeration agitation, and in aeration agitation process, gas-water ratio is 5:1, and the sanitary sewage residence time is 6h;
C, anoxic pond anaerobic treatment: the sanitary sewage after aeration agitation in equalizing tank is sent into anoxic pond, stir with agitator, agitator stirring velocity is 20r/min, sanitary sewage residence time 1.0h-1.5h;
D, membrane bioreactor filter: send in membrane bioreactor by the sanitary sewage through anaerobic treatment by lift pump, successively through aerobic area, sloping plate deposition district and film district, in aerobic area, gas-water ratio is 7:1, the sanitary sewage residence time is 2h, in aerobic area, mud is back to oxygen-starved area by mud return line, reflux ratio is 1:1, and in sloping plate deposition district, the sanitary sewage residence time is 2h, and in film district, the sanitary sewage residence time is 2h;
E, water outlet: the sanitary sewage after process in film district is evacuated to clear water zone by producing water pump, flow by gravity discharge after sanitary sewage residence time 1h, in the sanitary sewage of discharge, COD clearance is 85%-95%, BOD5 clearance is 90%-95%, ammonia nitrogen removal frank is 90%, TN clearance is 60%, SS clearance is 99%.
As preferably, before step a, sanitary sewage carries out pre-treatment in oil trap and septic tank.
As preferably, in steps d, in membrane bioreactor, MLSS concentration is 10000mg/L, SRT is 30 days.
As preferably, in steps d, sludge reflux is by being installed on the valve regulated return sludge ratio on mud return line.
Beneficial effect of the present invention is:
1, due to unpowered sludge reflux, add oxygen-starved area sludge concentration, improve the efficiency of denitrification denitrogenation, solve the phenomenon that normal film bio-reactor TN exceeds standard.
2, to have processing efficiency high for this technique, and cost is low, easy-operating feature.
3, sludge discharge is few, organic sludge zero release, and inorganic mud easily reclaims, and improves processing efficiency, reduces resource consumption.
4, after process, water outlet reaches " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level A and marks.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
In figure: 1, thickness grid; 2, equalizing tank; 3, anoxic pond; 4, lift pump; 5, aerobic area; 6, sloping plate deposition district; 7, film district; 8, mud return line; 9, water outlet.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments the present invention is described in further detail.
As shown in Figure 1, a kind of unpowered backflow efficient denitrification technique, comprise equalizing tank, anoxic pond and membrane bioreactor, the position of described membrane bioreactor is higher than equalizing tank and anoxic pond, described anoxic pond is communicated with membrane bioreactor by the lift pump being arranged at its inside, aerobic area, sloping plate deposition district, film district, the several region in battery limits and clear water zone is divided in described membrane bioreactor, the aerobic area of described membrane bioreactor is communicated with oxygen-starved area by mud return line, comprise the following steps
Step one, thickness grid filtration: be 200mg/L-600mg/L, BOD5 by COD be 120mg/L-480mg/L, SS be 150mg/L-300mg/L, TN be 40mg/L-60mg/L, the sanitary sewage that ammonia nitrogen is 20mg/L-50mg/L, pH value is 6-9 is sent in equalizing tank through thick, fine fack after filtering successively;
Step 2, equalizing tank Air Exposure: in equalizing tank, send into air, carry out homogeneous aeration agitation, and in aeration agitation process, gas-water ratio is 5:1, and the sanitary sewage residence time is 6h;
Step 3, anoxic pond anaerobic treatment: the sanitary sewage after aeration agitation in equalizing tank is sent into anoxic pond, stir with agitator, agitator stirring velocity is 20r/min, sanitary sewage residence time 1.0h-1.5h;
Step 4, membrane bioreactor filter: send in membrane bioreactor by the sanitary sewage through anaerobic treatment by lift pump, successively through aerobic area, sloping plate deposition district and film district, in aerobic area, gas-water ratio is 7:1, the sanitary sewage residence time is 2h, in aerobic area, mud is back to oxygen-starved area by mud return line, reflux ratio is 1:1, add oxygen-starved area sludge concentration, improve denitrification denitrogenation efficiency, in sloping plate deposition district, the sanitary sewage residence time is 2h, and in film district, the sanitary sewage residence time is 2h;
Step 5, water outlet: the sanitary sewage after process in film district is evacuated to clear water zone by producing water pump, flow by gravity discharge after sanitary sewage residence time 1h, in the sanitary sewage of discharge, COD clearance is 85%-95%, BOD5 clearance is 90%-95%, ammonia nitrogen removal frank is 90%, TN clearance is 60%, SS clearance is 99%.
In following examples, before step one, sanitary sewage carries out pre-treatment in oil trap and septic tank.
In following examples, in step 4, in membrane bioreactor, MLSS concentration is 10000mg/L, SRT is 30 days.
In following examples, in step 4, sludge reflux is by being installed on the valve regulated return sludge ratio on mud return line.
Embodiment 1
Small-sized sanitary sewage disposal point, treatment scale is 300m
3/ d, in former water, COD is 210.3mg/L, SS is 151.1mg/L, ammonia nitrogen be 24.2mg/L, TN be 43.1mg/L, pH is 6-9.Maintaining the oxygen-starved area residence time is 1.49h, and the membrane bioreactor residence time is that 4.3h, pH maintain 7.53, and temperature maintains 16.4 DEG C.The rear water outlet of process reaches " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level A and marks.Indices is as table 1:
Table 1 result
Embodiment 2
Small-sized sanitary sewage disposal point, treatment scale is 500m
3/ d, in former water, COD is 312.3mg/L, SS is 177.1mg/L, ammonia nitrogen be 29.3mg/L, TN be 45.6mg/L, pH is 6-9.Maintaining the oxygen-starved area residence time is 1.43h, and the membrane bioreactor residence time is that 4.1h, pH maintain 6.98, and temperature maintains 15.3 DEG C.
The rear water outlet of process reaches " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level A and marks.Indices is as table 2:
Table 2 result
Embodiment 3
Large-scale sanitary sewage disposal point, treatment scale is 1500m
3/ d, in former water, COD is 322.1mg/L, SS is 280.2mg/L, ammonia nitrogen be 40.1mg/L, TN be 65.3mg/L, pH is 6-9.Maintaining the oxygen-starved area residence time is 1.55h, and the membrane bioreactor residence time is that 4.2h, pH maintain 7.58, and temperature maintains 14.6 DEG C.
The rear water outlet of process reaches " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level A and marks.Indices is as table 3:
Table 3 result
Claims (4)
1. a unpowered backflow efficient denitrification technique, comprise equalizing tank, anoxic pond and membrane bioreactor, the position of described membrane bioreactor is higher than equalizing tank and anoxic pond, described anoxic pond is communicated with membrane bioreactor by the lift pump being arranged at its inside, aerobic area, sloping plate deposition district, film district, battery limits and region, 5, clear water zone is divided in described membrane bioreactor, the aerobic area of described membrane bioreactor is communicated with oxygen-starved area by mud return line, it is characterized in that: comprise the following steps
A, thickness grid filtration: be 200mg/L-600mg/L, BOD5 by COD be 120mg/L-480mg/L, SS be 150mg/L-300mg/L, TN be 40mg/L-60mg/L, the sanitary sewage that ammonia nitrogen is 20mg/L-50mg/L, pH value is 6-9 is sent in equalizing tank through thick, fine fack after filtering successively;
B, equalizing tank Air Exposure: in equalizing tank, send into air, carry out homogeneous aeration agitation, and in aeration agitation process, gas-water ratio is 5:1, and the sanitary sewage residence time is 6h;
C, anoxic pond anaerobic treatment: the sanitary sewage after aeration agitation in equalizing tank is sent into anoxic pond, stir with agitator, agitator stirring velocity is 20r/min, sanitary sewage residence time 1.0h-1.5h;
D, membrane bioreactor filter: send in membrane bioreactor by the sanitary sewage through anaerobic treatment by lift pump, successively through aerobic area, sloping plate deposition district and film district, in aerobic area, gas-water ratio is 7:1, the sanitary sewage residence time is 2h, in aerobic area, mud is back to oxygen-starved area by mud return line, reflux ratio is 1:1, and in sloping plate deposition district, the sanitary sewage residence time is 2h, and in film district, the sanitary sewage residence time is 2h;
E, water outlet: the sanitary sewage after process in film district is evacuated to clear water zone by producing water pump, flow by gravity discharge after sanitary sewage residence time 1h, in the sanitary sewage of discharge, COD clearance is 85%-95%, BOD5 clearance is 90%-95%, ammonia nitrogen removal frank is 90%, TN clearance is 60%, SS clearance is 99%.
2. one according to claim 1 unpowered backflow efficient denitrification technique, is characterized in that: before step a, and sanitary sewage carries out pre-treatment in oil trap and septic tank.
3. one according to claim 1 and 2 unpowered backflow efficient denitrification technique, is characterized in that: in steps d, and in membrane bioreactor, MLSS concentration is 10000mg/L, SRT is 30 days.
4. one according to claim 3 unpowered backflow efficient denitrification technique, is characterized in that: in steps d, and sludge reflux is by being installed on the valve regulated return sludge ratio on mud return line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108101218A (en) * | 2018-02-02 | 2018-06-01 | 天津壹新环保工程有限公司 | Method and device for removing total nitrogen in sewage |
| CN112062406A (en) * | 2020-09-08 | 2020-12-11 | 江苏众志新禹环境科技有限公司 | Method for treating inorganic ceramic membrane filtering type domestic sewage |
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| CN103570131A (en) * | 2013-11-21 | 2014-02-12 | 绿地环保科技股份有限公司 | Facultative anaerobic type membrane bioreaction integrated sewage treatment equipment |
| CN103833188A (en) * | 2014-03-24 | 2014-06-04 | 蒲晓斌 | High-suspension easy-to-biochemically treated wastewater treatment method |
| CN104098178A (en) * | 2014-07-30 | 2014-10-15 | 重庆耐德机械设备有限公司 | Efficient nitrogen and phosphorus removal MBR (Membrane Bioreactor) device |
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- 2015-05-18 CN CN201510253067.0A patent/CN104860476A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102826726A (en) * | 2012-09-25 | 2012-12-19 | 重庆三峰环境产业集团有限公司 | Refuse incineration plant leachate treatment process |
| CN103539251A (en) * | 2013-10-22 | 2014-01-29 | 江西金达莱环保股份有限公司 | Method for synchronously degrading carbon, nitrogen and phosphorus in wastewater without discharging sludge |
| CN103570131A (en) * | 2013-11-21 | 2014-02-12 | 绿地环保科技股份有限公司 | Facultative anaerobic type membrane bioreaction integrated sewage treatment equipment |
| CN103833188A (en) * | 2014-03-24 | 2014-06-04 | 蒲晓斌 | High-suspension easy-to-biochemically treated wastewater treatment method |
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| CN108101218A (en) * | 2018-02-02 | 2018-06-01 | 天津壹新环保工程有限公司 | Method and device for removing total nitrogen in sewage |
| CN112062406A (en) * | 2020-09-08 | 2020-12-11 | 江苏众志新禹环境科技有限公司 | Method for treating inorganic ceramic membrane filtering type domestic sewage |
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