CN103787511B - Method for achieving partial nitrification and denitrification by shortening sedimentation time - Google Patents
Method for achieving partial nitrification and denitrification by shortening sedimentation time Download PDFInfo
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- CN103787511B CN103787511B CN201410084941.8A CN201410084941A CN103787511B CN 103787511 B CN103787511 B CN 103787511B CN 201410084941 A CN201410084941 A CN 201410084941A CN 103787511 B CN103787511 B CN 103787511B
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Abstract
The invention discloses a method for achieving partial nitrification and denitrification by shortening sedimentation time and belongs to the technical field of biological sewage treatment. A sequencing batch activated sludge reactor is used for inoculating common flocculent activated sludge, by controlling inflow water quality, dissolved oxygen, temperature, hydraulic retention time, sedimentation time and other parameters, nitrite accumulation can be achieved within 60 days-120 days, and partial nitrification sludge with enriched ammonia-oxidizing bacteria is obtained. Compared with a conventional control mode through dissolved oxygen and sludge age, the sludge discharging strategy by shortening sedimentation time is used, dual purposes of reserving of activated sludge with good sedimentation performance and sludge age controlling are achieved, and the risks that sludge sedimentation performance is poor, and sludge expands due to the fact that dissolved oxygen of the reactor is too low are avoided. The method is easy to operate, sludge-water separating effect is good, operation effect is stable, and good effect can be achieved when waste water with the high ammonia nitrogen and the low carbon nitrogen ratio is treated.
Description
Technical field
The invention belongs to technical field of biological sewage treatment, being specifically related to a kind of method realizing short-cut nitrification and denitrification by shortening the settling time.
Background technology
Short-cut nitrification and denitrification technique refers to and controls at Nitrification Stage by ammonium oxidation, then carries out denitrification, eliminates in traditional biological denitrogenation and becomes nitrate by nitrite-oxidizing, restores into nitrite two links.Compared to traditional biological denitrificaion technique altogether, this technology has very large advantage in actual motion technological process: 1. save 25% oxygen supply, reduces energy consumption; 2. reduce by 40% carbon source, realize denitrification denitrogenation when entering organic matter of water concentration is lower; 3. shorten reaction mechanism, save the denitrification pool volume of 50%; 4. reduce sludge yield, nitrifying process can produce mud about 33% ~ 35% less, and the denitrification stage produces mud about 55% less.
The key of short-cut nitrification and denitrification technique is the enrichment of ammonia oxidation bacteria (AOB) and eliminating of NOB (NOB), and the mark that this technique realizes is that reactor has stable and higher nitrite accumulation rate (NAR).Affect the primary outer of nitrite accumulation because have temperature, pH value, influent ammonia nitrogen loading, dissolved oxygen and sludge age etc.Utilize the avidity of AOB with NOB two kinds of bacterial classifications to dissolved oxygen different, control reactor and be in lower dissolved oxygen concentration, thus optionally suppress NOB to be more common method.But under low DO condition, reactor easily grows thread fungus, thus sludge bulking and sludge settling property is caused to decline, the promotion and application of short-cut nitrification and denitrification technique of these drawbacks limit.
The object of the present invention is to provide a kind of method realizing short-cut nitrification and denitrification by shortening the settling time, by controlling the parameter such as influent quality, dissolved oxygen and hydraulic detention time of sequencing batch activated sludge reactor (SBR), eliminate the poor active sludge of settling property by the strategy shortening the settling time, thus the sludge settling property of short distance nitration reactor is effectively improved.Further, in this course because the discharge of mud makes reactor can be in lower sludge age, this can promote reactor wash-out NOB further.The present invention can turn out the short distance nitration mud being rich in AOB in 60 ~ 120 days, the method regulates and controls reactor compared to separately through dissolved oxygen or sludge age, lower sludge age wash-out NOB can be realized, can sludge settling property be improved again, there is obvious technical superiority.
Summary of the invention
The object of this invention is to provide and a kind ofly realize the method for short-cut nitrification and denitrification by shortening the settling time, solve long, the poor difficult problem of sludge settling property of existing short-cut nitrification and denitrification technique enriching ammonia oxidation bacteria cycle.In order to achieve the above object, the present invention is by the following technical solutions:
Realizing a method for short-cut nitrification and denitrification by shortening the settling time, it is characterized in that comprising the steps:
(1) adopt sequencing batch activated sludge reactor (SBR) to inoculate common cotton-shaped active sludge, seed sludge volume is 30 ~ 50% of reactor, and inoculation post-reactor sludge concentration is 2000 ~ 4000 mg/L;
(2) reactor inlet flow-patterm is 7.5 ~ 8.0, and inlet COD concentration is 500 ~ 800 mg/L, water inlet NH
4 +-N concentration is 200 ~ 400 mg/L, and water inlet total phosphorus concentration is 20 ~ 40 mg/L;
(3) controlling sbr reactor device dissolved oxygen is 0.5 ~ 2 mg/L, temperature is 22 ~ 28 DEG C, hydraulic detention time 16 ~ 24 h, monocycle aeration time 300 ~ 400 min, settling time is 15 ~ 25 min, nitrite accumulation can be realized in 60 ~ 120 days, and obtain the short distance nitration mud of enriching ammonia oxidation bacteria.
A kind of described method realizing short-cut nitrification and denitrification by shortening the settling time, it is characterized in that: the sbr reactor device aspect ratio in described step (1) is 2 ~ 6, adopt bottom water inlet and bottom micro-pore aeration, be furnished with mechanical stirrer and realize muddy water and mix, reactor discharge rate is 50%.
A kind of described method realizing short-cut nitrification and denitrification by shortening the settling time, is characterized in that: the nitrite accumulation in described step (3) refers to that SBR water outlet nitrite concentration accounts for 80 ~ 95% of nitrite and nitrate concentration summation.
A kind of described method realizing short-cut nitrification and denitrification by shortening the settling time, is characterized in that: the short distance nitration mud median size in described step (3) is 200 ~ 350 μm.
The object of this invention is to provide a kind of method realizing short-cut nitrification and denitrification by shortening the settling time, its advantage embodied and feature are:
(1) utilize low dissolved axygen to realize the strategy of short-cut nitrification and denitrification, have sludge settling property difference and sludge bulking equivalent risk, the shortening settling time technology that the present invention proposes effectively can realize the change of sludge settling property when low dissolved axygen.Therefore, have a good application prospect when processing high ammonia nitrogen and low ratio of carbon to ammonium waste water.
(2) simultaneously, the control methods of sludge age are controlled compared to the sludge quantity being pipetted certain volume by aeration latter stage, the present invention optionally can get rid of the mud of settling property difference by shortening the settling time, achieve the dual purpose retaining the good active sludge of settling property and control compared with short SRT.
Accompanying drawing explanation
Accompanying drawing 1 is sequencing batch activated sludge reactor of the present invention (SBR) schematic diagram: reactor body (1), aerator (2), intake pump (3), go out water solenoid valve (4), mechanical stirrer (5), time control program (6), distribution reservoir (7).
Accompanying drawing 2 is short distance nitration mud particle diameter comparison diagrams of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.Should be understood that described in following examples it is for illustration of the present invention, not in order to limit the present invention.
Adopt sequencing batch activated sludge reactor (SBR) to inoculate common cotton-shaped active sludge, accompanying drawing 1 is shown in by reactor schematic diagram.Mainly comprise reactor body (1), aerator (2), intake pump (3), go out water solenoid valve (4), mechanical stirrer (5), time control program (6), distribution reservoir (7).Sbr reactor device basal diameter is 12cm, and virtual height is 30cm, and aspect ratio is 2.5, and adopt bottom water inlet and bottom micro-pore aeration, be furnished with mechanical stirrer and realize muddy water and mix, reactor discharge rate is 50%.Seed sludge volume is 30% of reactor, and inoculation post-reactor sludge concentration is 2300 mg/L.
Simulated wastewater domestication is adopted to cultivate aerobic particle mud, NaCH
3cOOH is simulation carbon source, NH
4cl is simulation nitrogenous source, KH
2pO
4for simulation phosphorus source, artificial distribution's water quality used is as follows: configuration sbr reactor device inlet flow-patterm is 7.5, and inlet COD concentration is 600 mg/L, water inlet NH
4 +-N concentration is 300 mg/L, and water inlet total phosphorus concentration is 30 mg/L, CaCl
22H
2o 30 mg/L, MgSO
47 H
2o 25 mg/L, FeSO
47 H
2o 20 mg/L.Meanwhile, 1mL trace element is added in often liter of simulated wastewater: H
3bO
30.05 g/L, ZnCl
20.05 g/L, CuCl
20.03 g/L, MnSO
4h
2o 0.05 g/L, (NH
4)
6moO
244H
2o 0.05 g/L, AlCl
30.05 g/L, CoCl
26H
2o 0.05 g/L, NiCl
20.05 g/L.Controlling sbr reactor device dissolved oxygen is 1.0 mg/L, and temperature is 25 DEG C, hydraulic detention time 16 h, and it is 8 h that operational mode sets a cycle, water inlet 5min, leaves standstill 85min, aeration 300min before anoxic, settling time is reduced to 15min gradually by 25 min, water outlet 5min, and all the other are idle mixing time.
Reactor Effec-tive Function 120 days, reactor achieves good nitrite accumulation, and obtain the short distance nitration mud of enriching ammonia oxidation bacteria, SBR water outlet nitrite concentration average out to 120 mg/L, water outlet nitrate concentration is 20mg/L, and water outlet nitrous acid concentration accounts for 85.7% of nitrite and nitrate concentration summation.Meanwhile, owing to shortening the strategy of settling time, short distance nitration reactor mud median size is increased to 266.0 μm (accompanying drawings 2) by 102.6 μm of seed sludge.
Claims (1)
1. realizing a method for short-cut nitrification and denitrification by shortening the settling time, it is characterized in that comprising the steps:
(1) sequencing batch activated sludge reactor (SBR) is adopted to inoculate common cotton-shaped active sludge, sbr reactor device aspect ratio is 2 ~ 6, adopt bottom water inlet and bottom micro-pore aeration, be furnished with mechanical stirrer to realize muddy water and mix, reactor discharge rate is 50%, seed sludge volume is 30 ~ 50% of reactor, and inoculation post-reactor sludge concentration is 2000 ~ 4000 mg/L;
(2) reactor inlet flow-patterm is 7.5 ~ 8.0, and inlet COD concentration is 500 ~ 800 mg/L, water inlet NH
4 +-N concentration is 200 ~ 400 mg/L, and water inlet total phosphorus concentration is 20 ~ 40 mg/L;
(3) controlling sbr reactor device dissolved oxygen is 0.5 ~ 2 mg/L, temperature is 22 ~ 28 DEG C, hydraulic detention time 16 ~ 24 h, monocycle aeration time 300 ~ 400 min, settling time is 15 ~ 25 min, can realize nitrite accumulation in 60 ~ 120 days, and water outlet nitrite concentration accounts for 80 ~ 95% of nitrite and nitrate concentration summation, and obtaining the short distance nitration mud of enriching ammonia oxidation bacteria, short distance nitration mud median size is 200 ~ 350 μm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105036316B (en) * | 2015-06-26 | 2017-07-11 | 成都信息工程大学 | A kind of denitrogenation method of low ratio of carbon to ammonium class waste water |
| CN105585126B (en) * | 2016-03-11 | 2018-05-25 | 北京工业大学 | A kind of method that stable sludge slight expansion and good denitrification effect are maintained in sbr reactor device |
| CN106167330B (en) * | 2016-06-09 | 2022-11-18 | 北京工业大学 | IEM-UF nitrogen enrichment nitrosation denitrification nitrogen removal method and device |
| CN106277313A (en) * | 2016-07-18 | 2017-01-04 | 吉林化工学院 | A kind of energy-saving and cost-reducing sequencing batch activated sludge processes technique and device |
| CN107963720A (en) * | 2017-12-10 | 2018-04-27 | 济南大学 | A kind of short distance nitration coupling solid slow-release carbon source denitrification combination nitrogen rejection facility and method |
| CN108483822A (en) * | 2018-05-30 | 2018-09-04 | 济南大学 | A kind of Combined waste water high-efficient denitrification and dephosphorization processing unit and application |
| CN110117065A (en) * | 2019-04-16 | 2019-08-13 | 深圳市长隆科技有限公司 | A kind of sequencing batch reactor and application method of rapidly cultivating aerobic particle sludge |
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