CN102126815A - Method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of pipeline - Google Patents

Method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of pipeline Download PDF

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Publication number
CN102126815A
CN102126815A CN 201110038784 CN201110038784A CN102126815A CN 102126815 A CN102126815 A CN 102126815A CN 201110038784 CN201110038784 CN 201110038784 CN 201110038784 A CN201110038784 A CN 201110038784A CN 102126815 A CN102126815 A CN 102126815A
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pond
sewage
anaerobic
aerobic
anoxic
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CN102126815B (en
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王荣昌
励建全
杨殿海
司书鹏
郑翔
张衡汇
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Tongji University
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Tongji University
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Abstract

The invention relates to a method for reinforcing nitrogen and phosphorous removal from sewage by utilizing anaerobic environment of a pipeline. The method comprises the following specific steps: the municipal sewage enters into an anaerobic tank, an anoxic tank and a first aerobic tank in sequence from a first sewage inflow point, part of the nitration solution at the tail end of the first aerobic tank flows back to the initial end of the anoxic tank, the sludge mixed solution and the sewage entering from a second sewage inflow point are mixed, enter into a sewage pipeline and then enter into a second aerobic tank to complete organic matter degradation and nitration process, and at the same time, the nitration solution flows back to the initial end of a sludge pipeline and enters into a secondary sedimentation tank to undergo sludge and water separation, part of the sludge flows back to the initial end of the anaerobic tank and the residual sludge is discharged, wherein the DO (dissolved oxygen) in the anaerobic tank is controlled below 0.1mg/L; the DO in the anoxic tank is controlled below 0.5mg/L; and the DO in the first aerobic tank and the second aerobic tank is 1.0-2.0mg/L. The process has the beneficial effects of ensuring reasonable hydraulic retention time and proper backflow ratio by controlling two-point inflow, two stages (anaerobic stage and aerobic stage), two-stage nitration solution backflow and the like and achieving the aim of reinforcing the effect of nitrogen and phosphorous removal from sewage aiming at the municipal sewage with low carbon-nitrogen ratio.

Description

A kind of method of utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization
Technical field
The invention belongs to the dirty water living creature processing technique field, be specifically related to a kind of method of utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization.
Background technology
In recent years, along with rapid economic development, about 400-500 hundred million m of quantity of wastewater effluent in China every year 3And among this, that discharging only is 15%-25% after treatment, and wherein quite a few is through the sewage after traditional second-stage treatment, though can remove most suspended solids and organism, but nutritive element pollutents such as still residual many nitrogen, phosphorus cause the many rivers of China all therefore to produce pollution in various degree (especially eutrophication phenomenon) thus, and water surrounding goes from bad to worse.The excessive emissions of nitrogen, phosphorus is the major cause of body eutrophication.The strictness control of point source and pollution of area source is the approach that prevents that water pollution is the most basic, and it then is one of effective means that the strictness of sewage disposal plant effluent nitrogen, phosphorus content is controlled." urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) is more and more stricter to the emission control of nutritive elements such as nitrogen, phosphorus.Along with the raising day by day of control criterion, many traditional sewage works also face the requirement of upgrading.At the situation of part of contaminated water factory floor space deficiency, limited fund, consider to make full use of the intrinsic facility of plant area and realize the upgrading target.
Often there is the large amount of sewage pipeline in the sewage work.These pipelines can guarantee certain flow velocity usually, and degree of filling is higher relatively, can realize anoxia condition to a certain extent.In the design and the process of modernizing and expanding the existing factory of small sewage treatment plant, if conditions permit can be given prominence to the characteristics of utilizing the pipeline anaerobic environment, design realizes the denitrogenation dephosphorizing function.These class methods rarely have report at present both at home and abroad, have bigger application prospect in Sewage Plant old factory transformation and enlarging process.
Summary of the invention
The objective of the invention is to propose a kind of method of utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization.
The method of utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization that the present invention proposes, adopt pipeline anaerobic environment strengthening sewage denitrification and dephosphorization system handles to utilize pipeline anaerobic environment strengthening sewage denitrification and dephosphorization, this method is realized by two sections AO, system is by anaerobic pond 1, anoxic pond 2, first Aerobic Pond 3, second Aerobic Pond 4, second pond 5, the first nitrification liquid return-flow system, the second nitrification liquid return-flow system, aerating system and mud return-flow system are formed, anaerobic pond 1 one sides insert municipal effluent by the first sewage water entry, opposite side connects anoxic pond 2, anoxic pond 2 links to each other with first Aerobic Pond 3, be connected by long sewer line between first Aerobic Pond 3 and second Aerobic Pond 4, second Aerobic Pond 4 connects second pond 5, and second pond 5 connects rising pipe; Be provided with agitator in anaerobic pond 1 and the anoxic pond 2, second pond 5 bottoms connect anaerobic pond 1 by the mud return-flow system, discharge excess sludge by pipeline; First Aerobic Pond 3 connects anoxic pond 2 tops by the first nitrification liquid return-flow system, first Aerobic Pond 3 is connected to sewer line top by the second nitrification liquid return-flow system, at this sewer line front end the second sewage water entry is set, is laid with aerating system in first Aerobic Pond 3 and second Aerobic Pond 4; Concrete steps are as follows:
Municipal effluent enters anaerobic pond 1, anoxic pond 2 and first Aerobic Pond 3 successively through the first sewage water entry, and the hydraulic detention time (HRT) of anaerobic pond 1, anoxic pond 2 and first Aerobic Pond 3 is respectively 0.5-1.0 h, 1.5-2.5 h and 2.0-5.0h; First Aerobic Pond, 3 terminal nitrification liquid parts are back to anoxic pond 2 tops by the first nitrification liquid return-flow system, and reflux ratio is 0.5-1.5; Then mud mixed liquid mixes with the sewage that the second sewage water entry inserts, and enters sewer line then, and the residence time is 0.3-0.6h, guarantees that in sewer line flow velocity is 0.6-2.5 m/s, realizes anaerobic environment, finishes denitrification and organic matter degradation effect; By entering second Aerobic Pond 4 behind the sewer line again, hydraulic detention time is 0.5-1.5 h, finishes organic matter degradation and nitrifying process, simultaneously nitrification liquid is back to sludge pipe top, and reflux ratio is 0.5-1.5; Enter second pond 5 at last and carry out mud-water separation, the water outlet discharging, part mud is back to anaerobic pond 1 top, and control of reflux ratio is at 1-3; All the other mud are discharged as excess sludge; Wherein: control anaerobic pond DO is below 0.1 mg/L, and anoxic pond DO is below 0.5 mg/L, and the DO of first Aerobic Pond 3 and second Aerobic Pond 4 is 1.0-2.0mg/L.
Among the present invention, aerating system adopts perforated pipe aerating regulation device or disc type micro-hole aerator.
The present invention makes full use of the formed anaerobic environment of sewage connecting tube between first Aerobic Pond and second Aerobic Pond, the nitrification liquid that in batches refluxes, and the segmentation denitrification has reduced nitrification liquid backflow total amount, has improved the denitrification denitrogenation performance of system simultaneously.
The present invention sets up two water entries separately, and when reducing the system handles load, realization makes full use of carbon source in the sewage, guarantees the denitrification effect; Avoided simultaneously in the settling tank having improved the sedimentation function and the phosphor-removing effect of system, be particularly suitable for into carbon-nitrogen ratio lower municipal sewage treatment in the water because of denitrification produces the mud come-up that bubble causes.
Adopted 2 water inlets, two sections AO in technical process, two sections internal reflux are to promote denitrogenation dephosphorizing efficient.Make full use of the anaerobic environment in the sewer line, can reduce the facility floor space significantly, save initial cost, simultaneously can guarantee anoxia condition to a certain extent, make full use of the carbon source in the sewage water inlet, the denitrification denitrogenation effect of consolidation system improves effluent quality.For promoting the denitrogenation dephosphorizing effect, two nitrification liquid backflow routes have also been established in the flow process, respectively by the terminal anoxic section top that flows into of different aerobic sections, for nitration denitrification has been created good condition.
Mud is released phosphorus at anaerobic zone, enter aerobic zone after because the effect of aerating system, DO rises, nitrification begins to carry out, the excessive phosphorus of taking the photograph of polyP bacteria carries out dephosphorization function repeatedly, the treating part organism has guaranteed effluent quality simultaneously.
The present invention considers the actual demand of China's sewage, by reasonable use to anaerobic environment in the sewer line, can optimization system technology, prolong the residence time of sewage under anoxia condition, strengthen denitrification, and don't need invest newly-built anoxic pond on a large scale, exchange the lifting of bigger treatment effect for less initial cost and floor space, practical, convenient simultaneously feasible, save investment, simplify the operation, saving and take up an area of, improve denitrogenation dephosphorizing efficient, is further in the future enlarging slot milling simultaneously.
Feature of the present invention and advantage are:
(1) compares with traditional AAO technology, anaerobism section hydraulic detention time is shorter, in treatment scheme thereafter, connect two sections anoxics and aerobic, wherein one section anoxic is carried out in anoxic pond, another section anoxic is carried out in sewer line, make full use of the anaerobic environment in the sewer line, realized the function of anoxic section.
(2) compare conventional AAO technology, this technology is established two sections internal reflux, enter the oxygen-starved area from different aerobic zones respectively, can improve the denitrification effect of system, water outlet nitrate and total nitrogen concentration are lower, have improved effluent quality on the one hand, on the other hand, the mud of having avoided causing because of denitrification in the settling tank floats, and has improved the sedimentation function of system and overall denitrogenation dephosphorizing efficient.
(3) compare with traditional AAO technology, present method is provided with two water entries, realizes the making full use of of carbon source in the sewage, and is particularly suitable for into the lower municipal sewage treatment of carbon-nitrogen ratio in the water.
(4) under the not high condition of the organic loading of sewage, can reach denitrogenation dephosphorizing effect preferably, each pollutent index can be controlled at lower concentration effectively, satisfy the discharging water quality requirement that most of town sewage plant is handled.
(5) treatment effect is stable, and construction investment is economized, and working cost is lower, and practicality and feasibility are stronger, and each section is arranged compact, and floor space is little, and the facility utilization is abundant, is fit to especially that sewage work modernizes and expands the existing factory and situation such as enlarging.
Description of drawings
Fig. 1 is technological principle of the present invention and process flow diagram.
Number in the figure: 1 is anaerobic pond, and 2 is anoxic pond, and 3 is first Aerobic Pond, and 4 is second Aerobic Pond, and 5 is second pond.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1: under the normal condition, take Shanghai City Pudong treatment plant influent quality: COD is 100-180mg/L, and ammonia nitrogen is 15-25mg/L, and total nitrogen is 20-35mg/L, and total phosphorus is 1.0-4.0mg/L.Take 50% nitrification liquid reflux ratio and 100% return sludge ratio, first Aerobic Pond 3 and second Aerobic Pond, 4 dissolved oxygens of control 1.5mg/L, effluent quality can reach: COD is below 20mg/L, clearance is about 10-15%, total nitrogen is 10-15mg/L, total phosphorus is below 1.2mg/L, and ammonia nitrogen removal frank reaches more than 96%.
Embodiment 2: high density water inlet and lower concentration water inlet at the municipal sewage plant, PVG are investigated this art breading effect respectively.Under the high density water inlet condition, water inlet COD is 178.74mg/L, and TN is 35.75mg/L, and TP is 2.55mg/L, ammonia nitrogen is 31.47mg/L, TSS is 343mg/L, and after system handles, water outlet COD is 21.41mg/L, TN is 19.51mg/L, TP is 1.26mg/L, and ammonia nitrogen is 0.34mg/L, and TSS is 19mg/L.Under the lower concentration water inlet condition, water inlet COD is 99.93mg/L, and TN is 19..99mg/L, and TP is 1.43mg/L, ammonia nitrogen is 17.59mg/L, TSS is 192mg/L, and after system handles, water outlet COD is 12.62mg/L, TN is 10.99mg/L, TP is 0.71mg/L, and ammonia nitrogen is 0.37mg/L, and TSS is 11mg/L.
Embodiment 3: at the influent quality in municipal sewage plant, PVG summer (June) and winter (January), to the treatment effect of this technology under condition of different temperatures be: summer, (25 ℃) can guarantee that water outlet TN is at 5-15mg/L during comparatively high temps, TP is below 1.2mg/L, COD is below 20mg/L, and average removal rate reaches 55.0%, 51.0% and 88.9% respectively.Under the winter low temperature condition (15 ℃), nitrifying process can be a greater impact, water outlet TN maintains about 10mg/L substantially, TP is below 0.5mg/L, COD is below 15mg/L, and average removal rate reaches 49.9%, 72.0% and 88.7% respectively, and denitrification effect is not as summer, but because the reduction of total phosphorus load, phosphor-removing effect is better than summer.

Claims (2)

1. method of utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization, it is characterized in that adopting pipeline anaerobic environment strengthening sewage denitrification and dephosphorization system handles to utilize pipeline anaerobic environment strengthening sewage denitrification and dephosphorization, this method is realized by two sections AO, system is based upon on the circulation pulling flow type system, by anaerobic pond (1), anoxic pond (2), first Aerobic Pond (3), second Aerobic Pond (4), second pond (5), the first nitrification liquid return-flow system, the second nitrification liquid return-flow system, aerating system and mud return-flow system are formed, anaerobic pond (1) one side was passed through the first sewage water entry and was inserted municipal effluent, opposite side connects anoxic pond (2), anoxic pond (2) links to each other with first Aerobic Pond (3), be connected by long sewer line between first Aerobic Pond (3) and second Aerobic Pond (4), second Aerobic Pond (4) connects second pond (5), and second pond (5) connects rising pipe; Be provided with agitator in anaerobic pond (1) and the anoxic pond (2), second pond (5) bottom connects anaerobic pond (1) by the mud return-flow system, discharges excess sludge by pipeline; First Aerobic Pond (3) connects anoxic pond (2) top by the first nitrification liquid return-flow system, first Aerobic Pond (3) connects sewer line top by the second nitrification liquid return-flow system, at this sewer line front end the second sewage water entry is set, is laid with aerating system in first Aerobic Pond (3) and second Aerobic Pond (4); Concrete steps are as follows:
Municipal effluent enters anaerobic pond (1), anoxic pond (2) and first Aerobic Pond (3) successively by the first sewage water entry, and the hydraulic detention time of anaerobic pond (1), anoxic pond (2) and first Aerobic Pond (3) is respectively 0.5-1.0 h, 1.5-2.5 h and 2.0-5.0h; The terminal nitrification liquid part of first Aerobic Pond (3) is back to anoxic pond (2) top by the first nitrification liquid return-flow system, and reflux ratio is 0.5-1.5; Then mud mixed liquid mixes with the sewage that the second sewage water entry inserts, and enters sewer line then, and the residence time is 0.3-0.6h, guarantees that in sewer line flow velocity is 0.6-2.5 m/s, realizes anaerobic environment, finishes denitrification and organic matter degradation effect; By entering second Aerobic Pond 4 behind the sewer line again, hydraulic detention time is 0.5-1.5 h, finishes organic matter degradation and nitrifying process, simultaneously nitrification liquid is back to sludge pipe top, and reflux ratio is 0.5-1.5; Enter second pond (5) at last and carry out mud-water separation, the water outlet discharging, part mud is back to anaerobic pond (1) top, and control of reflux ratio is at 1-3; All the other mud are discharged as excess sludge; Wherein: control anaerobic pond DO is below 0.1 mg/L, and anoxic pond DO is below 0.5 mg/L, and the DO of first Aerobic Pond (3) and second Aerobic Pond (4) is 1.0-2.0mg/L.
2. the method for utilizing pipeline anaerobic environment strengthening sewage denitrification and dephosphorization according to claim 1 is characterized in that aerating system adopts perforated pipe aerating regulation device or disc type micro-hole aerator.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102557351A (en) * 2012-01-19 2012-07-11 哈尔滨工业大学 Method for reinforcing nitrogen and phosphorus removal in sewage as well as sludge reduction coupling in process
CN103214145A (en) * 2013-03-24 2013-07-24 北京工业大学 Water pollution control method suitable for river inlets of northern areas
CN104058554A (en) * 2014-07-04 2014-09-24 哈尔滨工业大学深圳研究生院 A2O2-MBR sewage treatment process and device
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
CN106865905A (en) * 2017-03-27 2017-06-20 欧基(上海)环保科技有限公司 It is a kind of to meet the sewage disposal system for being directly discharged into the class water body standard of II class of earth's surface III
CN111410313A (en) * 2020-04-07 2020-07-14 西安理工大学 Side-flow type enhanced biological phosphorus removal process
CN112408699A (en) * 2020-10-30 2021-02-26 南京大学 Integrated denitrification method for wastewater containing toxic and harmful organic matters

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CN201614333U (en) * 2009-12-09 2010-10-27 中国科学院城市环境研究所 Decentralized sewage treatment device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102557351A (en) * 2012-01-19 2012-07-11 哈尔滨工业大学 Method for reinforcing nitrogen and phosphorus removal in sewage as well as sludge reduction coupling in process
CN103214145A (en) * 2013-03-24 2013-07-24 北京工业大学 Water pollution control method suitable for river inlets of northern areas
CN103214145B (en) * 2013-03-24 2014-04-09 北京工业大学 Water pollution control method suitable for river inlets of northern areas
CN104058554A (en) * 2014-07-04 2014-09-24 哈尔滨工业大学深圳研究生院 A2O2-MBR sewage treatment process and device
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
CN106865905A (en) * 2017-03-27 2017-06-20 欧基(上海)环保科技有限公司 It is a kind of to meet the sewage disposal system for being directly discharged into the class water body standard of II class of earth's surface III
CN111410313A (en) * 2020-04-07 2020-07-14 西安理工大学 Side-flow type enhanced biological phosphorus removal process
CN112408699A (en) * 2020-10-30 2021-02-26 南京大学 Integrated denitrification method for wastewater containing toxic and harmful organic matters
CN112408699B (en) * 2020-10-30 2021-07-30 南京大学 Integrated denitrification method for wastewater containing toxic and harmful organic matters

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