CN101811801B - Direct-flow biological nitrogen removal sewage treatment method - Google Patents
Direct-flow biological nitrogen removal sewage treatment method Download PDFInfo
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Abstract
The invention relates to a direct-flow biological nitrogen removal sewage treatment method, and belongs to the field of sewage treatment. The full flow of sewage at an NH3-N concentration of less than 60mg/l flows from a first-stage aerobic pond at a beginning end to an anaerobic pond sequentially, then flows into a second-stage aerobic pond at a terminating end, and is discharged without refluxing. In the first-stage aerobic pond, the dissolved oxygen concentration is more than 5mg/l, and the BOD5 removal rate is less than 50 percent. A biological mass is put into the anaerobic pond, wherein the biological mass consists of a shell and an inner core; the shell is a ball with the porosity of 90 to 94 percent consisting of 10 to 12 pieces of arc plastic sheets; the inner core in the center of the ball is an aldehyde fiber ball; the porosity expands and increases from the inner core in the center of the ball to the outside gradually; and the volume of the put biological mass is 50 to 70 percent of the effective capacity of the anaerobic pond. By improving an A20 process flow and combining with the application of a three-phase biological mass, the method achieves the dynamic balance of overall amount of aerobic bacteria, facultative bacteria and anaerobic bacteria, shortens the time difference between the nitrification and the denitrification of ammonium nitrogen and between the anaerobic release and the aerobic release of phosphorus, stably improves the nitrogen removal efficiency to above 90 percent, and can save the energy consumption by 0.1 to 0.2kwh/m3 and the operating cost by 0.07 to 0.12 yuan/m3.
Description
Technical field
The invention belongs to sewage treatment area, relate to a kind of modified version A
2The sewage water treatment method of O technology refers in particular to a kind of direct-flow biological nitrogen removal sewage treatment.
Background technology
Traditional biological denitrification process flow process (A
2O technology) in, anoxic pond is arranged on the front of Aerobic Pond, that is: anoxic pond → Aerobic Pond is back to anoxic pond from Aerobic Pond again, and dissolved oxygen mainly relies on from the phegma of Aerobic Pond and provides in the anoxic pond.Because the ammonia nitrogen in the sewage is difficult to directly be utilized in a large number by aerobe, having only partly, ammonia nitrogen is become the cell component part by biological metabolic the utilization.Therefore, ammonia nitrogen removal mainly is back to anoxic pond after Aerobic Pond aerobic bacteria nitrated is converted into nitric nitrogen, be reduced to gaseous nitrogen through anoxic pond amphimicrobe anti-nitration reaction again and overflow from water.The recurrence rate that is back to anoxic pond from Aerobic Pond generally is 200%～400%, carries out technical Analysis by 200% quantity of reflux: as former water flooding quantity is Q1000m
3/ h, the Aerobic Pond quantity of reflux is 2 times of Q of flooding quantity
Return2000m
3/ h, the actual flooding quantity at Aerobic Pond becomes Q1000m so
3/ h+Q
Return2000m
3/ h=Q
Always3000m
3/ h, Aerobic Pond finally discharge the water yield should equal former water flooding quantity Q1000m
3It is 1/3rd of the actual flooding quantity of Aerobic Pond that/h, Aerobic Pond finally discharge the water yield, and this explanation has 1/3rd nitric nitrogen not obtain reduction through the backflow denitrification in the Aerobic Pond drainage water to handle and directly discharged, influenced total removal efficient of ammonia nitrogen.
Summary of the invention
The present invention in order to overcome above-mentioned deficiency, provides a kind of direct-flow biological nitrogen removal sewage treatment method just, by improving A
2The O technical process adds a certain proportion of three-phase biologic Ball-type packing simultaneously and finishes synchronous nitration and denitrification in each biological tank, improved biological denitrificaion efficient, and saved the denitrogenation energy expenditure.
Specifically implement like this: direct-flow biological nitrogen removal sewage treatment method is characterized in that NH
3The sewage full flow of-N concentration＜60mg/l flows into anoxic pond successively from top one-level Aerobic Pond, discharge behind the inflow terminal secondary Aerobic Pond again, do not reflux in the centre, dissolved oxygen concentration＞5mg/L in the one-level Aerobic Pond in the water inlet sewage, the clearance of BOD5＜50%, throw in the anoxic pond biological group is arranged, described biological group is made up of shell and kernel, the porosity that shell is made up of 10-12 lobe arc plastic sheet is the spheroid of 90-94%, the ball centre kernel is the hydroformylation fibrous nodules, porosity is by the outwards diffusion increase gradually of ball centre kernel, and the input volume of biological group is the 50-70% of anoxic pond useful volume.
Ammonia nitrogen nitration reaction in the one-level Aerobic Pond is nitric nitrogen (partly ammonia nitrogen is assimilated by aerobe), be reduced to gaseous nitrogen and overflow from water through anti-nitration reaction in anoxic pond, residual nitrogen is further utilized the component part that is converted into biomass cells at the secondary Aerobic Pond by aerobe.One-level is aerobic different with the aerobic special emphasis of secondary because from the nitrated energy that is converted into nitrate (nitric nitrogen) of ammonia nitrogen mainly from dissolved oxygen, require that dissolved oxygen concentration reaches more than the 5mg/L in the stair oxidation pond.The emphasis of one-level Aerobic Pond is to take the short distance nitration method to make ammonia nitrogen nitrated fully under the high density dissolved oxygen conditions, do not pursue the clearance of CODcr, the clearance of BOD5 is controlled in 50%, and its purpose mainly is to provide enough carbon source organic matters for follow-up anoxic pond reduction ammonia nitrogen.
Since the adsorption-condensation poor performance of amphimicrobe, the growth conditions harshness, and therefore its quantity and active in aerobic bacteria need to drop into biological group in anoxic pond.The specific surface area of the biology group filler of this composite suspension is greater than 3000m
2/ m
3, suspension degree 1.02 ± 0.01, the central hair density of fibrous nodules is very high.On filler under the good oxygen condition, at first condense the aerobe flora during use and forming biological mycoderm, and stop up very large closed-type aerobic biology of filler hole formation from inside to outside gradually and roll into a ball, at this moment, the diffusion transmission of outside high density dissolved oxygen is influenced by the aerobic bacteria membrane resistance can't penetrate into biological group inside fully, thereby in filler, be formed centrally oxygen concentration gradient, make to have aerobic, anoxic, anaerobism micro in the biological group.Owing to different the acting on of the different microbe species of selecting of dissolved oxygen concentration that the three accepts given priority to, biology group under aerobic environment is outer based on aerobe, lay particular emphasis on the oxidation of coal reaction and remove the solubilised state organic matter, biology group internal layer under anaerobic environment is based on the anoxic biology, lay particular emphasis on the denitrification reduction reaction of nitrate, biological cluster centre under anaerobic environment lays particular emphasis on phosphatic release based on anaerobe.Along with anoxic, anaerobism space enlarge when surpassing the outer aerobic mycoderm cladding thickness limit of biological group gradually, the aerobic bacteria film rupture, be subjected to the effect of fluidic impellent, water quality that biological group is inner and outside water quality obtain exchange, dissolved oxygen enters anaerobic layer and destroys anoxic, anaerobic environment, repeats aerobic and the anaerobic alternation procedure.
The dissolved oxygen concentration that flow into the anoxic pond leading portion from the one-level Aerobic Pond is about between 0.5～1.5mg/L, and the anoxic pond leading portion still is in the aerobic nitrification state.Because anoxic pond does not add dissolved oxygen, wait for that the interior organism of anoxic pond will remain dissolved oxygen and consume naturally when being reduced to 0.14～0.05mg/L, anti-nitration reaction begins and improves gradually speed of reaction.Dissolved oxygen concentration is higher or lower than this numerical value in theory, and anti-nitration reaction all will stop.Dissolved oxygen concentration is higher than 0.14mg/L and just becomes aerobic reaction, and dissolved oxygen concentration is lower than 0.05mg/L and just becomes anaerobic reaction, and the anti-nitration reaction time in 0.05～0.14mg/L dissolved oxygen concentration scope is called effective reduction reaction time.The emphasis of secondary Aerobic Pond is CODcr that does not degrade fully in the technical process of degraded prime and the BOD5 that thoroughly removes.Because denitrification amphimicrobe (belonging to the susceptibility bacterial classification) is the autotrophic type bacterium, than the specific growth rate height of nitrated aerobic heterotrophic bacterium, the anti-nitration reaction time is short.For guaranteeing the reduction effect of nitric nitrogen, the design of anoxic pond anti-nitration reaction hydraulic detention time should add the time that leading portion consumes the dissolved oxygen process naturally, therefore, the distribution of the hydraulic detention time in each pond is 1.5-2 by one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond: 5: the 3-3.5 design.
For guaranteeing that direct-flow biological nitrogen removal has higher and stable clearance, further improve nitric efficiency, also throwing in one-level Aerobic Pond and secondary Aerobic Pond has biological group, the biological group that drops in the one-level Aerobic Pond is long-pending to be the 50-70% of one-level Aerobic Pond useful volume, and the biological group that drops in the secondary Aerobic Pond amasss and is the 40-60% of secondary Aerobic Pond useful volume.
Because aerobic bacteria, amphimicrobe and anerobe coexistence are arranged on same filler, numerous unit filler is equivalent to numerous heterogeneous bio-reactor, nitration reaction and anti-nitration reaction carry out synchronously, the application of this filler can be expanded the dissolved oxygen concentration arrival 1.2mg/L that amphimicrobe adapts to, and the ratio of increase amphimicrobe quantity and other biological flora, prolong effective reduction reaction time.
This technology is by improving A
2The O technical process, application in conjunction with three-phase biologic group, reached the running balance of aerobic bacteria, amphimicrobe and anerobe total amount, dwindled between the ammonia nitrogen nitrification and denitrification, the anaerobism of phosphorus discharges and aerobic absorption between time difference, nitric efficiency is stablized brought up to more than 90%, and can save power consumption, 0.07～0.12 yuan/m of saving of 0.1～0.2kwh/m3
3Working cost.
Embodiment
Embodiment 1, direct-flow biological nitrogen removal sewage treatment method, NH
3-N concentration is that the sewage full flow of 30mg/l flows into anoxic pond successively from top one-level Aerobic Pond, discharge behind the inflow terminal secondary Aerobic Pond again, do not reflux in the centre, dissolved oxygen concentration＞5mg/L in the one-level Aerobic Pond, the clearance of BOD5＜50%, throw in the anoxic pond biological group is arranged, described biological group is made up of shell and kernel, the porosity that shell is made up of 10-12 lobe arc plastic sheet is the spheroid of 90-94%, the ball centre kernel is the hydroformylation fibrous nodules, porosity is by the outwards diffusion increase gradually of ball centre kernel, the input volume of biological group is 40% of an anoxic pond useful volume, the one-level Aerobic Pond, anoxic pond, the hydraulic detention time partition ratio of secondary Aerobic Pond is 2: 5: 3, NH in the water outlet
3-N content is 2.5mg/l, and denitrification percent is 91.7%.
Embodiment 2, reference example 1, NH in the water inlet sewage
3-N concentration is 40mg/l, and the input volume of the biology group of throwing in the anoxic pond is 50% of an anoxic pond useful volume, and the hydraulic detention time partition ratio of one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond is 1.5: 5: 3.5, NH in the water outlet
3-N content is 2.7mg/l, and denitrification percent is 93.3%.
Embodiment 3, reference example 1, NH in the water inlet sewage
3-N concentration is 45mg/l, the input volume of the biology group of throwing in the anoxic pond is 60% of an anoxic pond useful volume, the hydraulic detention time partition ratio of one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond is 1.8: 5: 3.2, also throwing in one-level Aerobic Pond and the secondary Aerobic Pond has biological group, the biological group that drops in the one-level Aerobic Pond is long-pending to be 50% of one-level Aerobic Pond useful volume, the biological group that drops in the secondary Aerobic Pond is long-pending to be 60% of secondary Aerobic Pond useful volume, NH in the water outlet
3-N content is 2.5mg/l, and denitrification percent is 94.5%.。
Embodiment 4, reference example 1, NH in the water inlet sewage
3-N concentration is 48mg/l, the input volume of the biology group of throwing in the anoxic pond is 70% of an anoxic pond useful volume, the hydraulic detention time partition ratio of one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond is 2: 5: 3, the biological group that drops in the one-level Aerobic Pond is long-pending to be 70% of one-level Aerobic Pond useful volume, the biological group that drops in the secondary Aerobic Pond is long-pending to be 40% of secondary Aerobic Pond useful volume, NH in the water outlet
3-N content is 3.0mg/l, and denitrification percent is 93.8%.
Embodiment 5, reference example 1, NH in the water inlet sewage
3-N concentration is 50mg/l, the input volume of the biology group of throwing in the anoxic pond is 70% of an anoxic pond useful volume, the hydraulic detention time partition ratio of one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond is 2: 5: 3, the biological group that drops in the one-level Aerobic Pond is long-pending to be 60% of one-level Aerobic Pond useful volume, the biological group that drops in the secondary Aerobic Pond is long-pending to be 50% of secondary Aerobic Pond useful volume, NH in the water outlet
3-N content is 3.5mg/l, and denitrification percent is 93.0%.
Claims (3)
1. direct-flow biological nitrogen removal sewage treatment method is characterized in that NH
3The sewage full flow of-N concentration＜60mg/L flows into anoxic pond successively from top one-level Aerobic Pond, discharges behind the inflow terminal secondary Aerobic Pond again, does not reflux in the centre, dissolved oxygen concentration＞5mg/L in the one-level Aerobic Pond, BOD
5Clearance＜50%, throw in the anoxic pond biological group is arranged, described biological group is made up of shell and kernel, the porosity that shell is made up of 10-12 lobe arc plastic sheet is the spheroid of 90-94%, the ball centre kernel is the hydroformylation fibrous nodules, porosity is by the outwards diffusion increase gradually of ball centre kernel, and the input volume of biological group is the 50-70% of anoxic pond useful volume.
2. direct-flow biological nitrogen removal sewage treatment method according to claim 1, the hydraulic detention time partition ratio that it is characterized in that one-level Aerobic Pond, anoxic pond, secondary Aerobic Pond is 1.5-2: 5: 3-3.5.
3. direct-flow biological nitrogen removal sewage treatment method according to claim 1 and 2, it is characterized in that in one-level Aerobic Pond and secondary Aerobic Pond, throwing in biological group is arranged, the biological group that drops in the one-level Aerobic Pond is long-pending to be the 50-70% of one-level Aerobic Pond useful volume, and the biological group that drops in the secondary Aerobic Pond amasss and is the 40-60% of secondary Aerobic Pond useful volume.
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| CN102001791B (en) * | 2010-11-24 | 2012-11-14 | 哈尔滨工业大学 | Urban sewage strengthening treatment method in cold area based on multi-point feed water adjustment |
| CN105731717B (en) * | 2014-12-08 | 2018-09-04 | 中国石油天然气股份有限公司 | Acrylonitrile and two-step wet acrylic fiber wastewater treatment method |
| CN107324614A (en) * | 2017-08-30 | 2017-11-07 | 安徽华骐环保科技股份有限公司 | A kind of mark that carries is to the technique for treating industrial wastewater for being better than the class water quality of earth's surface IV |
| CN109095714B (en) * | 2018-08-29 | 2022-02-25 | 李磊 | Aerobic-anaerobic alternate sewage purification tank and purification process |
| CN109516560A (en) * | 2018-12-28 | 2019-03-26 | 苏州苏净环保新材料有限公司 | A kind of biologic packing material being exclusively used in synchronous nitration and denitrification sewage treatment process |
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| WO2000005177A1 (en) * | 1998-07-24 | 2000-02-03 | Dhv Water B.V. | Process for the treatment of waste water containing specific components, e.g. ammonia |
| CN100361908C (en) * | 2005-09-01 | 2008-01-16 | 华中科技大学 | Sewage water denitrification handling method |
| CN100369836C (en) * | 2006-03-22 | 2008-02-20 | 湖南大学 | Synchronous denitrogen dephosphorus technology of city sewagte |
| US7655143B2 (en) * | 2006-08-01 | 2010-02-02 | University Of South Florida | Carbon dioxide stimulation of nitrification in activated sludge reactors |
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