CN103880251B - The A of a kind of short distance nitration coupling denitrification dephosphorization 2/ O-bio-contact oxidation method - Google Patents
The A of a kind of short distance nitration coupling denitrification dephosphorization 2/ O-bio-contact oxidation method Download PDFInfo
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- CN103880251B CN103880251B CN201410118141.3A CN201410118141A CN103880251B CN 103880251 B CN103880251 B CN 103880251B CN 201410118141 A CN201410118141 A CN 201410118141A CN 103880251 B CN103880251 B CN 103880251B
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Abstract
The A of a kind of short distance nitration coupling denitrification dephosphorization
2/ O-biological contact oxidation plant and method belong to field of biological sewage treatment.This device is primarily of A
2/ O reactor (comprising anaerobic zone, oxygen-starved area, aerobic zone), inclined-plate clarifying basin, biological contact oxidation pond and settling region composition.Described A
2the aerobic zone of/O reactor is connected by over-pass with inclined-plate clarifying basin, and inclined-plate clarifying basin connects biological contact oxidation pond, and biological contact oxidation pond connects settling region; Be provided with filler in described biological contact oxidation pond, material is carbon fiber, and Main Function has been short distance nitration.Sludge reflux pump and A
2be communicated with bottom the anaerobic zone of/O reactor, nitrification liquid reflux pump connects water tank and A
2the oxygen-starved area of/O reactor, realizes denitrification dephosphorization.The present invention has given full play to the advantage of short distance nitration and denitrification dephosphorization, advantages such as having saving carbon source, save aeration rate, sludge yield is low.
Description
Technical field
The present invention relates to the apparatus and method that a kind of partial nitrification and denitrification dephosphorization coupling realizes synchronous denitrification dephosphorizing, belong to technical field of biological sewage treatment.
Background technology
The difficult problem that faces of tradition denitrification dephosphorization technique is: the problem how solving denitrifying bacteria and polyP bacteria competition carbon source and both mud age.Forefathers have also been made a lot of work for this reason, as added the contradiction that carbon source or change flow process alleviation denitrifying bacteria and polyP bacteria are competed carbon source, but these methods all bring the waste on the energy, and the proposition of Denitrifying Phosphate Accumulating Organisms theory proposes new thinking to synchronous denitrification dephosphorizing.Compared with traditional denitrification dephosphorization technique, the advantage of Denitrifying Phosphorus Removal Technology is: save the COD consumption of 50%, avoid to organic competition between denitrifying bacteria and poly-phosphorus microorganism, is applicable to the low C/N sewage of process; Reduce by the aeration rate of 30%, save energy consumption; Sludge yield is low, about reduces 50%, thus reduces sludge treatment expense; The volume of reactor can be reduced, reduce capital cost etc.
But, in order to realize the normal operation of this technique, just need enough nitric nitrogens or nitrite nitrogen, for denitrification dephosphorization provides enough electron acceptor(EA)s.And compared with complete nitrification, short distance nitration controls in the first stage by nitrifying process, current much research both domestic and external shows, compared with complete nitrification, short distance nitration can save the oxygen supply energy consumption of 25%, reduce the reaction times, pond will be reduced hold in actual moving process, and reduce and run and investment cost.But short distance nitration is stability contorting not easily, therefore how to realize and maintain stable short distance nitration and become the study hotspot in current bio-denitrifying sewage field.
Microbial film is attached type growth, is adapted to the cultivation of generation cycle longer nitrated class bacterial classification, and simultaneously because microbial film has certain diaphragm thickness, anaerobic environment is easily caused in microbial film inside.The change of this dissolved oxygen and mass transfer gradient makes ammonia nitrogen not easily be converted into nitric nitrogen, is easy to the realization of nitrosation reaction, so relative to activated sludge process, biomembrance process is more easily cultivated nitrated class bacterial classification and realized short distance nitration.
A
2after biological contact oxidation pond is placed in settling tank by/O-Biological Contact Oxidation Process, its Main Function has been the oxidation of ammonia nitrogen, and the effluent recycling of biological contact oxidation pond is to A
2the anoxic section of/O device, for denitrification dephosphorization provides sufficient electron acceptor(EA), namely means that organic removal, denitrification and dephosphorization are all at A
2carry out in/O, successfully solve the competitive contradiction in traditional technology between each flora.Especially under low C/N condition, being beneficial to Denitrifying Phosphate Accumulating Organisms DPAOs and becoming dominant bacteria, achieve the efficiency utilization of carbon source, is a kind of energy-saving and cost-reducing advanced nitrogen dephosphorization process.
Summary of the invention
The present invention is directed in current sewage disposal C/N of intaking low, the problems such as denitrogenation dephosphorizing efficiency is not high, and energy consumption is large, by two kinds of novel denitrification dephosphorization technique couplings, is a kind of economical and efficient, the apparatus and method that can realize advanced nitrogen dephosphorization.
The A of a kind of short distance nitration coupling denitrification dephosphorization
2/ O-biological contact oxidation plant, is characterized in that: based on A
2/ O reactor 2, inclined-plate clarifying basin 3, biological contact oxidation pond 4, settling region 5 integration is coupled and builds, and is separately provided with former water tank 1 and goes out water tank 6.Described A
2/ O reactor 2 comprises anaerobic zone 9, oxygen-starved area 10 and aerobic zone 11; Described A
2the aerobic zone 11 of/O reactor 2 is connected by over-pass 12 with inclined-plate clarifying basin 3, and inclined-plate clarifying basin 3 connects biological contact oxidation pond 4; Be provided with filler 15 in described biological contact oxidation pond 4, material is carbon fiber, and Main Function has been short distance nitration; Described settling region 5 is provided with overflow port 16 and mud discharging mouth 17; Described A
2aerating system is equipped with in the aerobic zone 11 of/O reactor 2 and biological contact oxidation pond 4; Whipping appts 8 is provided with in the anaerobic zone 9 of described AAO reactor 2 and oxygen-starved area 10; Sludge reflux pump 21 is connected with bottom the anaerobic zone 9 of AAO reactor 2; Nitrification liquid reflux pump 23 connects the oxygen-starved area 10 of water tank 6 and AAO reactor 2.
The method of AAO-biological contact oxidation plant intensified denitrification and dephosphorization, mainly comprises the following steps:
1) former water enters A through intake pump 7 together with the returned sluge sent here through sludge reflux pump 21 from inclined-plate clarifying basin 3
2the anaerobic zone 9 of/O reactor 2, return sludge ratio 100% ~ 200%, mean sludge concentration 6000 ~ 10000mg/L.By whipping appts 8 fully hybrid reaction; Denitrifying Phosphate Accumulating Organisms (DPAOs) utilizes the organic synthesis internal carbon source (PHA) in former water to be stored in cell paste, releases phosphorus simultaneously.
2) mixed solution enters oxygen-starved area 10 subsequently, and what enter realizes short distance nitration through biological contact oxidation pond 4 and complete the nitrification liquid of solid-liquid separation, mixed liquid recycle ratio 100% ~ 400% simultaneously in addition; DPAOs for final electron acceptor(EA), take PHA as electron donor, with the mode synchronous denitrifying phosphorus removal of " carbon is dual-purpose " with nitrite (part nitrate).
3) mixed solution enters aerobic zone 11 through oxygen-starved area 10, and dissolved oxygen DO is at 2.5 ~ 4.0mg/L, and hydraulic detention time is 1.0 ~ 1.5h.Main Function inhales phosphorus further, the N of stripping denitrification process generation simultaneously
2, be convenient to follow-up mud-water separation.
4) mixed solution carries out mud-water separation at inclined-plate clarifying basin 3, sedimentation time 1.5 ~ 2.5h, supernatant liquor containing ammonia nitrogen enters biological contact oxidation pond 4, and precipitating sludge is back to the anaerobic zone 9 of AAO reactor 2 through sludge reflux pump 21, to ensure having enough biomasss in reactor.
5) be provided with filler 15 in biological contact oxidation pond 4, material is carbon fiber, specific surface area 1500 ~ 2000m
2/ m
3, filling ratio 20 ~ 30%, porosity is greater than 99%, hydraulic load 1.67 ~ 2.92m
3/ (m
2d), hydraulic detention time 0.76 ~ 1.34h, by regulating the factors such as temperature, dissolved oxygen, free ammonia, HRT, controls the oxidation of ammonia nitrogen in the nitrite nitrogen stage.
6) after above-mentioned process, enter settling region 5, supernatant liquor enters out water tank 6 through overflow port 16, and the microbial film come off is discharged from bottom mud discharging mouth 17; Part water outlet enters A through nitrification liquid reflux pump 23
2the oxygen-starved area 10 of/O reactor 2, another part directly discharges.
The A of short distance nitration coupling denitrification of the present invention dephosphorization
2compared with/O-biological contact oxidation plant follows prior art with method, there is following advantages:
1) to solve in traditional technology contradiction between length mud age, by dephosphorization and denitrification two self-contained process couplings, especially on the basis of short distance nitration, realize synchronous denitrifying phosphorus removal.
2) biological contact oxidation pond biomass is many, nitrification efficiency is high, without the need to back flushing, treatment effect stablize.
3) farthest save carbon source and aeration rate, especially can obtain higher denitrogenation dephosphorizing efficiency when sewage carbon source is not enough.
4) Reaction time shorten, reduces reactor volume and floor space, reduces capital cost.
5) sludge yield is low, alleviates sludge disposal problem, reduces running cost.
6) technical process is simple, and operational management is convenient, is applicable to the upgrading of sewage work.
Accompanying drawing explanation
Fig. 1 is A
2/ O-bio-contact oxidation intensified denitrification and dephosphorization apparatus structure schematic diagram.
In figure: the former water tank of 1-; 2-A
2/ O reactor; 3-inclined-plate clarifying basin; 4-biological contact oxidation pond; 5-settling region; 6-goes out water tank; 7-intake pump; 8-whipping appts; 9-anaerobic zone; 10-oxygen-starved area; 11-aerobic zone; 12-over-pass; 13-swash plate; 14-sludge funnel; 15-filler; 16-overflow port; 17-mud discharging mouth; 18-under meter; 19-aeration main; 20-gas blower; 21-sludge reflux pump; 22-excess sludge discharge mouth; 23-nitrification liquid reflux pump.
Embodiment
Below in conjunction with drawings and Examples, the application's patent is further described:
As shown in Figure 1, A
2/ O-bio-contact oxidation intensified denitrification and dephosphorization device, this system is primarily of former water tank 1, A
2/ O reactor 2, inclined-plate clarifying basin 3, biological contact oxidation pond 4, settling region 5 and go out water tank 6 and form.Reactor body is made by synthetic glass, wherein AAO reactor 2 totally six lattice rooms, and first lattice room is anaerobic zone 9, and four lattice are subsequently oxygen-starved areas 10, and last lattice are aerobic zones 11, cubic capacity 40L, hydraulic detention time 5.0 ~ 12.0h; All install whipping appts 8 in anaerobic zone 9 and oxygen-starved area 10, the aerobic zone residence time is shorter, dissolved oxygen 2.5 ~ 4.0mg/L.Inclined-plate clarifying basin 3 connects A by over-pass 12
2the aerobic zone 11 of/O reactor 2, realizes mud-water separation through swash plate 13, and owing to not containing nitric nitrogen, sludge settling property is good; Bottom is provided with sludge funnel 14 and excess sludge discharge mouth 22, and funnel cone and horizontal sextant angle are 30 ° ~ 45
°.
Biological contact oxidation pond 4 is totally three lattice, is inside provided with filler 15, and material is carbon fiber, is evenly distributed on plastic disks, is fixed in reactor, specific surface area 1500 ~ 2000m
2/ m
3, filling ratio 20 ~ 30%, porosity is greater than 99%, hydraulic load 1.67 ~ 2.92m
3/ (m
2d), hydraulic detention time 0.76 ~ 1.34h, controls the oxidation of ammonia nitrogen in the nitrite nitrogen stage.
Because this packing specific area is large, filling surface easily adsorbs and adheres to mud, and biomass is high, and nitrification effect is stablized, and the measure of control that can take are as follows:
1) temperature: raised temperature not only can accelerate the growth velocity of ammonia oxidation bacteria, can also expand the gap in the growth velocity of ammonia oxidation bacteria and NOB simultaneously, is conducive to screening ammonia oxidation bacteria, eluriates NOB.Adopt heating rod, control the temperature of biological contact oxidation pond at 25 ~ 35 DEG C.
2) dissolved oxygen DO: due to ammonia oxidation bacteria to the avidity of oxygen and oxygen consumption rate all higher than NOB, therefore, when the dissolved oxygen mass concentration in reaction system becomes restrictive factor, namely under low DO condition, NOB metabolic capacity significantly declines, the ability of its oxidation nitrite nitrogen greatly weakens, thus causes the accumulation of nitrite nitrogen in system.Regulate aeration rate, control the dissolved oxygen concentration of biological contact oxidation pond three lattice at 0.5 ~ 2.0mg/L.
3) free ammonia FA:FA has obvious restraining effect to nitration reaction, and it is generally acknowledged that FA has restraining effect to NOB and ammonia oxidation bacteria, wherein the former is more responsive to FA, suppresses even if less FA concentration also can produce it.FA concentration is realized at 1 ~ 5mg/L by regulating former water ammonia nitrogen concentration.
4) hydraulic detention time HRT:HRT is the important factor affecting nitrification effect, can realize the control to nitrated process by adjustment flooding velocity.
5) add inhibitor: oxygenant also can have an impact to nitration reaction, the sterilizing agents be widely used in Water purification such as chlorine, dioxide peroxide and bromine optionally can suppress nitrifier, and have feasibility economically.Potcrate or sodium chlorate can be adopted as inhibitor, concentration 1 ~ 10mmol/L.
Above-mentioned several measure can be implemented separately also can various ways coupling.
Settling region 5 is made up of upper and lower two portions, and upper part is provided with overflow port 16, and the microbial film that lower part comes off is discharged from bottom mud discharging mouth 17.Part water outlet enters A through nitrification liquid reflux pump 23
2the oxygen-starved area 10 of/O reactor 2, another part directly discharges.
Be former water with the sanitary sewage of certain service facility community septic tank, its water quality characteristics sees the following form:
Test conditions: A
2/ O reactor flooding velocity Q=5L/h, HRT=8h, return sludge ratio 100%, SRT controls at about 12d, reactor mean sludge concentration 1900 ~ 2500mg/L.Biological contact oxidation pond filling ratio 25%, three lattice dissolved oxygen at about 1.5mg/L, water temperature 22 ~ 26 DEG C, mixed liquid recycle ratio 300%, hydraulic load 2.08m
3/ (m
2d), effective residence time HRT=1.07h.Only control dissolved oxygen in operational process, do not have temperature control and do not add inhibitor, average nitrous accumulation rate is 32.97% ~ 51.99%.Water outlet average COD, NH
4 +-N, NO
3 --N, NO
2 --N, TN, TP etc. be respectively 40.35,1.62,7.15,5.12,14.65,0.29mg/L, all reach one-level A standard with each index of upper water-out.Believe by real-time control, can realize and maintain higher nitrous accumulation rate.
This technique not only embodies the separation of sludge age, and apply short distance nitration and denitrification dephosphorization theory and technology, the unification of denitrification and dephosphorization process fundamentally solves the competition of traditional technology to carbon source, achieve the saving of carbon source and aeration rate and the decrement of excess sludge, application prospect is very wide.
Claims (1)
1. apply the A of a kind of short distance nitration coupling denitrification dephosphorization
2the method of/O-biological contact oxidation plant, this device comprises the former water tank (1) be linked in sequence, A
2/ O reactor (2), inclined-plate clarifying basin (3), biological contact oxidation pond (4), settling region (5) and go out water tank (6); Described A
2/ O reactor (2) comprises anaerobic zone (9), oxygen-starved area (10) and aerobic zone (11); The water outlet of described aerobic zone (11) enters inclined-plate clarifying basin (3) through over-pass (12), enters biological contact oxidation pond (4) after swash plate (13) completes mud-water separation; Establish filler (15) in described biological contact oxidation pond (4), material is carbon fiber; Described settling region (5) is provided with overflow port (16) and mud discharging mouth (17); Aerating system is equipped with in the aerobic zone (11) of described AAO reactor (2) and biological contact oxidation pond (4); Described A
2whipping appts (8) is provided with in the anaerobic zone (9) of/O reactor (2) and oxygen-starved area (10); Sludge reflux pump (21) and A
2the bottom, anaerobic zone (9) of/O reactor (2) is connected; Nitrification liquid reflux pump (23) connects water tank (6) and A
2the oxygen-starved area (10) of/O reactor (2);
It is characterized in that:
1) former water enters A through intake pump (7) together with the returned sluge sent here through sludge reflux pump (21) from inclined-plate clarifying basin (3)
2the anaerobic zone (9) of/O reactor (2), return sludge ratio 100% ~ 200%, mean sludge concentration 6000 ~ 10000mg/L;
2) mixed solution enters oxygen-starved area (10) subsequently, and what synchronously enter carries out short distance nitration through biological contact oxidation pond (4) in addition and complete the nitrification liquid of solid-liquid separation, mixed liquid recycle ratio 100% ~ 400%;
3) mixed solution in oxygen-starved area (10) along journey plug-flow, and by whipping appts (8) fully hybrid reaction; Enter aerobic zone (11) subsequently, dissolved oxygen DO is 2.5 ~ 4.0mg/L, and hydraulic detention time is 1.0 ~ 1.5h;
4) mixed solution enters inclined-plate clarifying basin (3) through over-pass (12) and carries out mud-water separation, sedimentation time 1.5 ~ 2.5h, supernatant liquor containing ammonia nitrogen enters biological contact oxidation pond (4), and precipitating sludge is back to A through sludge reflux pump (21)
2the anaerobic zone (9) of/O reactor (2);
5) be provided with filler (15) in biological contact oxidation pond (4), material is carbon fiber, specific surface area 1500 ~ 2000m
2/ m
3, filling ratio 20 ~ 30%, porosity is greater than 99%, hydraulic load 1.67 ~ 2.92m
3/ (m
2d), hydraulic detention time is 0.76 ~ 1.34h, controls the oxidation of ammonia nitrogen in the nitrite nitrogen stage;
6) after above-mentioned process, enter settling region (5), supernatant liquor enters out water tank (6) through overflow port (16), and the microbial film come off is discharged from bottom mud discharging mouth (17).
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| CN104877901B (en) * | 2015-06-03 | 2017-05-10 | 中国水产科学研究院渔业机械仪器研究所 | Testing system for studying denitrifying bacteria population ecology |
| CN105668946B (en) * | 2016-04-05 | 2019-01-11 | 江南大学 | A kind of Cattle Wastewater processing system and processing method |
| CN106045041A (en) * | 2016-07-16 | 2016-10-26 | 北京工业大学 | A<2>/O denitrifying phosphorus removal device and method for bi-granule sludge improvement |
| CN108101213A (en) * | 2016-11-25 | 2018-06-01 | 湖北水云涧环保工程有限公司 | Sewage combination biochemistry and sludge static state deposition separating treatment integrated apparatus |
| CN106830325A (en) * | 2017-03-23 | 2017-06-13 | 扬州大学 | Using the A of fermented sludge2/ O BCO improved technologies |
| CN107162212B (en) * | 2017-06-03 | 2020-11-10 | 秦皇岛华恒生物工程有限公司 | Alanine wastewater treatment process |
| CN108996689B (en) * | 2018-09-10 | 2021-03-30 | 哈尔滨工业大学 | Solid carbon source micro-aeration device and wastewater treatment method thereof |
| CN111138024B (en) * | 2019-06-18 | 2020-11-10 | 苏州科技大学 | Integrated vertical circulating reactor for nitrogen and phosphorus removal of sewage |
| CN117401823B (en) * | 2023-12-13 | 2024-02-27 | 广东科清环境技术有限公司 | High-turbidity sea water culture concentrated water treatment method |
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| CN102849845A (en) * | 2012-08-27 | 2013-01-02 | 北京化工大学 | Preparation method and application of biological carbon fiber water treatment filler |
| CN103482820B (en) * | 2013-09-11 | 2015-01-14 | 北京工业大学 | AAO-biological contact oxidation strengthened nitrogen and phosphorus removal integrated device and method |
| CN103496818B (en) * | 2013-09-11 | 2015-01-07 | 北京工业大学 | AAO (Anaerobic-Anoxic-Oxic)-biological contact oxidation strengthened denitrification and dephosphorization device and real-time control method of low C/N sewage treatment |
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