CN101746931B - Denitrification dephosphorization biological treatment and filtration integral sewage treatment system and method thereof - Google Patents
Denitrification dephosphorization biological treatment and filtration integral sewage treatment system and method thereof Download PDFInfo
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- CN101746931B CN101746931B CN2009102661351A CN200910266135A CN101746931B CN 101746931 B CN101746931 B CN 101746931B CN 2009102661351 A CN2009102661351 A CN 2009102661351A CN 200910266135 A CN200910266135 A CN 200910266135A CN 101746931 B CN101746931 B CN 101746931B
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Abstract
The invention provides a denitrification dephosphorization biological treatment and filtration integral sewage treatment system, which sequentially comprises a reaction tank, an aerobic main aeration tank, an aerobic solid-liquid separation tank and a filtering tank in the sewage flow direction, wherein the aerobic solid-liquid separation tank is provided with a three-phase separator, is respectively connected with the reaction tank and the aerobic main aeration tank through pipelines, and is used for providing back flowing mud. Through the organic combination of the biological treatment and the filtering process, the invention fully utilizes the high-efficient solid-liquid separation capability of the filtering process for ensuring that the biological treatment tank can reach higher mud concentration, the size of the reaction tank can be reduced, and indexes such as suspended substances in outlet water and the like can reach higher standard through filtration.
Description
Technical field
The present invention relates to sewage disposal technology, specifically, relate to the Sewage treatment systems and the method thereof of a kind of nitrogen and phosphorus removal bio processing and filtering integral.
Background technology
Biological treatment is a most popular treatment process in the WWT, and this art breading efficient is high, and is stable, is city's main flow technology that industrial sewage handles of having stable political situation.
Microorganism concn has only 2-4g/L in the conventional biological treatment reaction tank, and the structures volume is bigger, and construction investment is high.How improving the microorganism concn in the biological treatment tank, is a main direction improving biological treatment.At present, the mode that improves microorganism concn in the biological treatment tank mainly contains two kinds, and the one, add biologic packing material; Adopt this mode, sludge concentration can improve 1-5g/L in the aerobic reaction pond, to organic degraded; Particularly nitration reaction all has very big benefit, and the pond holds can dwindle 1/3-1/2.Another kind of mode is to adopt membrane bioreactor, holds back the mikrobe that takes away with water outlet to greatest extent, improves the sludge concentration in the reactor drum.In the membrane bioreactor, sludge concentration can reach about 10g/L usually, can save subsequent processes such as second pond and filtration, simplifies the WWT flow process.But the membrane bioreactor construction investment is higher, and operation energy consumption is much higher than conventional treatment process, and the membrane module life-span is shorter, the running maintenance more complicated; These problems to a certain extent, have limited applying of membrane bioreactor.How adopting a kind of economical and practical mode to improve the biological reaction tank sludge concentration, is a main direction improving bio-reactor.
Filtration is the core process of advanced treatment of wastewater.In recent years, the sewage disposal plant effluent emission standard improves constantly, and makes to filter in sewage treatment process, to widely apply, and filtration process process and equipment have all had significant improvement.Main filtered version has several types of traditional filtering, mechanical filters etc.Compare characteristics such as filtering technique has reduced investment, floor space is few and running cost is low with other technologies.Direct filtration or coagulation-deposition-filtration are the advanced treatment process that the municipal wastewater treatment plant of developed country generally adopts.Common filter tank comprises normal sands filter tank, mobile cover filter tank, V-type filter tank, T type filter tank, D type filter tank etc.There is following shortcoming in tradition sand filtration technology: floor space is big, investment is high, energy consumption is high, the operational management more complicated; Sometimes for preventing to grow algae, the sand filtration system also need increase the prechlorination device.
The disc filter of amber Rodisc and siemens Disk Filter is the new type of high efficiency filter that development in recent years is got up; This type strainer floor space is little, filtering velocity is high, filtering accuracy is higher; But weak point is back flushing, and required pressure is higher, causes working cost higher.The textile material filtering technique adopts the fabric medium as filtration medium; Fiber filter equipment has advantages such as head loss is few, auxiliary facility is few, take up an area of less, working cost is low; Therefore; On the basis of former B-grade sewage treatment plant, to remodel and expand and become simple, running maintenance is also more simple and convenient.
Novel straining installation volume is little, and the operation level of automation is high, can bear the high processing load.In traditional biological treatment; The biological reaction tank sludge concentration mainly refluxes by precipitating sludge and guarantees, the present invention adopts the aerobic-filtration integrated metallization processes that guarantees the Aerobic Pond sludge concentration with filtration process, outstanding effect of filtering in integrated artistic; Weaken precipitation process; In the hope of shortened process, reduce construction investment, and improve the effluent quality standard.
Summary of the invention
The Sewage treatment systems that the purpose of this invention is to provide a kind of nitrogen and phosphorus removal bio processing and filtering integral; It makes full use of the efficient solid-liquid separation capability of filtering basin and guarantees that Aerobic Pond reaches higher sludge concentration; Dwindle reaction tank and hold, and use index such as water suspension through filtration and reach higher standard.
Another object of the present invention provides the sewage water treatment method of a kind of nitrogen and phosphorus removal bio processing and filtering integral, and it has shortened flow process, reduces reactor volume, reduces construction investment.
In order to realize the object of the invention; The present invention provides the Sewage treatment systems of a kind of nitrogen and phosphorus removal bio processing and filtering integral; By effluent stream to comprising successively: reaction tank, aerobic main aeration tank, be provided with the aerobic solid-liquid separation tank and the filtering basin of triphase separator; Said aerobic solid-liquid separation tank links to each other through pipeline with said reaction tank, said aerobic main aeration tank respectively, is used to provide returned sluge.
Wherein, said reaction tank is anoxic pond or anaerobism anoxic pond.Said anaerobism anoxic pond is made up of anaerobic pond and anoxic pond.
Be provided with whisking appliance in the said reaction tank.
Plug-flow or complete mixing pit type are adopted in said aerobic main aeration tank.
In the said aerobic main aeration tank aerator is set.
In the said aerobic solid-liquid separation tank aerator is set.
Surface-type strainer and aerator are set in the said filtering basin.
The filtration medium of said surface-type strainer can adopt fiber medium, also can adopt metal medium, and surface load is 5-10m/h.
Said surface-type strainer also links to each other through pipeline with said reaction tank, provides back suction soil pick-up water to reaction tank.
Sewage treatment systems according to the invention also comprises grid treating pond and settling pit before reaction tank.
In order to realize another object of the present invention, a kind of nitrogen and phosphorus removal bio of the present invention is handled and the sewage water treatment method of filtering integral, and it may further comprise the steps:
1) sewage is introduced into reaction tank, mixes with returned sluge from aerobic solid-liquid separation tank, accomplishes anaerobic phosphorus release and denitrification process;
2) water outlet of reaction tank gets into Aerobic Pond master aeration tank again, accomplishes oxidation operation and nitrifying process;
3) water outlet of Aerobic Pond master aeration tank gets into the Aerobic Pond solid-liquid separation tank, continues to accomplish nitration reaction, and accomplishes preliminary gas, liquid, solid sepn process through triphase separator; Returned sluge is back to reaction tank from aerobic solid-liquid separation tank;
4) water outlet of Aerobic Pond solid-liquid separation tank gets into the filtering basin filtration and discharges, and filters backwashing water and is back to reaction tank.
Wherein, in the step 1), through ORP (redox potential) value in flooded condition and the reaction tank I and sludge concentration control quantity of reflux, HRT (hydraulic detention time) is 1-1.5h.Returned sluge and water inlet ratio are 100-300%.
Step 2) in the aerobic main aeration tank aerator 7 is set in, and carries out online DO observing and controlling, control DO concentration is between 2-4.
In the step 3), said triphase separator can calculate according to general anaerobic UASB (upflow anaerobic sludge blanket process) reactor drum, the flow velocity 1-4m/h that rises overally (measure realizes with the increase water conservancy diversion through the control flooding quantity).Control water outlet SS (suspended substance) is about 50mg/L.Returned sluge and excess sludge are all discharged from this Aerobic Pond solid-liquid separation tank.In this reactor drum, progressively accomplish granular sludge, form aerobic bacteria at skin, amphimicrobe and anerobes are realized synchronous nitration and denitrification in the structure of internal layer.
In the step 4), filter and adopt mechanical surface strainer (such as the surface-type strainer), filtering velocity 1-10m/h continues aeration in the filtration procedure, to increase filtration medium surface liquid flow velocity, avoid blocking filter.According to the liquid level difference Data Control backwash process of gathering, strainer regularly or carry out back flushing, the suction principle is adopted in back flushing; Utilize the back suction sucking pump to carry out back flushing with filter back water; Discharge the filtering basin deposition simultaneously, the bottom, filter tank is provided with shore pipe, utilizes back suction sucking pump spoil disposal.
In the step 4), the remaining active sludge in the Aerobic Pond solid-liquid separation tank also can regularly discharge through pipeline.
Sewage comprises also said sewage is carried out pre-treatment that said pre-treatment comprises that grid is handled and settling pit is handled before getting into reaction tank; Adopt grid from sewage, to remove the thicker suspended substance that possibly stop up water pump assembly and pipeline valve, and guarantee that the subsequent disposal facility can normally move; Adopt settling pit from sewage, to remove the bigger particles of proportion such as sand, cinder, in order to avoid the normal operation of these impurity effect subsequent disposal structures.
Compared with prior art, technical scheme of the present invention has following advantage:
1) shorten flow process, reduce reactor volume, reduce construction investment: traditional denitrification dephosphorization technique generally comprises technological processs such as anaerobism, anoxic, aerobic, deposition, filtration; Flow process is longer; The settling tank that adopts in the big-and-middle-sized engineering is normally circular, can't build jointly with other structures, makes that each structures must the split construction; Floor space is bigger, and construction investment is higher.The present invention adopts the three phase separation technology generation for deposition, utilizes filtering technique to realize final solid-liquid separation, shortens technological process, reduces structures quantity, reduces construction investment.On the other hand,, can improve the sludge quantity in the bio-reactor greatly, improve speed of response, dwindle reactor volume owing to need not rely on returned sluge to guarantee the sludge concentration in the bio-reactor.
2) compare with the method that adds filler and increase the biological reaction tank sludge concentration, save the biologic packing material investment, avoided the managerial problem of stuffing operation, need not improve in the biological tank DO concentration (dissolved oxygen concentration) and keep the biological treatment operation, save energy consumption.
3) finally adopt filtering technique to realize solid-liquid separation, effluent quality is good, and to general municipal effluent, water outlet can reach " urban wastewater treatment firm pollution discharge standard " one-level A standard.
4) adopt triphase separator in the biological tank, up-flow speed is higher, helps the discharge section floc sludge, progressively realizes granular sludge, further improves sludge concentration, strengthens the synchronous nitration and denitrification effect, improves the TN clearance.
Description of drawings
Fig. 1 is the schema of the Sewage treatment systems of nitrogen and phosphorus removal bio processing according to the invention and filtering integral.
Fig. 2 is the structural representation of anaerobism anoxic pond according to the invention.
Among the figure:
I anoxic or II Aerobic Pond master aeration tank, anaerobism hypoxia response pond
III Aerobic Pond solid-liquid separation tank IV filtering basin
1 water inlet of V outlet sump
2 water outlets, 3 pressurized air
4 excess sludges, 5 returned sluges
6 whisking appliances, 7 aerators
8 triphase separators, 9 surface-type strainers
10 return sludge pumps, 11 residual sludge pump
12 valves, 13 effluent weirs
14 reflux pumps, 15 back suction soil pick-up water
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Embodiment 1
As shown in Figure 1; Nitrogen and phosphorus removal bio of the present invention is handled the sewage water treatment method with filtering integral; Its treating processes is: raw waste water 1 at first gets into reaction tank I, and according to influent quality and water outlet requirement, reaction tank I can be set to independent anoxic pond or anaerobism and anoxic pond.Whisking appliance 6 is set in reaction tank I, after completion denitrification and the anaerobic phosphorus release process, gets into aerobic main aeration tank II, accomplish organic matter degradation and nitrifying process, then get into aerobic solid-liquid separation tank III.At aerobic solid-liquid separation tank III, triphase separator 8 is set, mud mixed liquid utilizes triphase separator; Accomplish preliminary solid-liquid separation process, supernatant gets into filtering basin IV, in filtering basin IV, further accomplishes the fine filtering process; Make water outlet reach emission standard, get into outlet sump V, final discharging.Mud internal reflux pump 10 is set, accomplishes from aerobic solid-liquid separation tank III to reaction tank I and the backflow of the mud of aerobic main aeration tank II, guarantee the reaction tank sludge concentration, realize denitrification and dephosphorization.Residual sludge pump 11 is set, accomplishes the excess sludge discharge process, guarantee suitable sludge age and sludge concentration.
A kind of nitrogen and phosphorus removal bio of the present invention is handled the Sewage treatment systems with filtering integral, comprises successively as follows:
1. reaction tank I
Reaction tank I can adopt two kinds of forms, separately anoxic pond or anaerobism anoxic pond.During separately as anoxic pond, raw waste water and returned sluge get into reaction tank I simultaneously, reflux ratio 100-300%, and the residence time calculates according to influent concentration.During as the anaerobism anoxic pond, reaction tank I is divided into two lattice, and raw waste water 1 gets into the first lattice I a anaerobic pond, and returned sluge 5 gets into the second lattice I b anoxic pond, and second lattice are provided with internal reflux pump 14, and mud mixture is back to first lattice, see shown in Figure 2.Reaction tank I is provided with whisking appliance 6a, 6b, and the form of whisking appliance and power calculate according to the pond type, guarantees that muddy water mixes.
Online ORP appearance and sludge concentration meter are set, according to ORP value and sludge concentration value control returned sluge valve 12, control quantity of reflux in reaction tank I.HRT (hydraulic detention time) is 1-1.5h.
2. aerobic main aeration tank II
Aerobic main aeration tank II can adopt plug-flow or complete mixing pit type, and aerator 7 is set, and pressurized air 3 gets in the aeration tank through aerator 7.The residence time calculates according to water quality.Partial reflux mud gets into aerobic main aeration tank II, guarantees sludge concentration.
Online DO appearance is set in the aerobic main aeration tank, and control DO concentration is between 2-4.
3. aerobic solid-liquid separation tank III
The guiding device (be located at the sidewall in pond on) of the mud mixture of aerobic main aeration tank II at the bottom of through the pond gets into aerobic solid-liquid separation tank III, guarantee that the cross direction water distribution is even in the pond.The solid-liquid displacement zone upflow velocity is 1-4m/h, adopts triphase separator to carry out gas-liquid and separates admittedly, and triphase separator calculates with anaerobic reactor similar, and water outlet gets into filtering basin IV through effluent weir 13.Aerobic solid-liquid displacement zone also is provided with aerator 7, continues to accomplish biological respinse.Return sludge pump 10 and residual sludge pump 11 are set at the bottom of the pond, and the mud quantity of reflux is the 100-300% of flooding quantity, and residual sludge pump is according to the water quality calculated flow rate.
Online DO appearance is set in the aerobic solid-liquid displacement zone, and control DO concentration is between 2-4.
4. filtering basin IV
Surface-type strainer 9 is set in the filtering basin IV, and the water after the filtration is got in the surface-type filter center pipe by the outside, flows to outlet sump.Along the surface-type strainer aerator is set in the filtering basin, strengthens surface-type filter surfaces liquid-flow through aeration, alleviate the surface-type filter surfaces and pollute, increase filtration cycle, aeration intensity is 2-4m
3/ m
2.h.Through filtering after a while, the surface-type filter surfaces has certain pollutent, causes filtering basin IV liquid level to increase, and starts the strainer back suction and inhales mechanism, carries out on-line cleaning.Surface-type strainer filtration medium can adopt fiber medium, also can adopt metal medium, surface load 5-10m/h.
In filtering basin IV, liquidometer is set, inhales process according to liquid level or time control back suction.Back suction soil pick-up water 15 is got back to reaction tank I or aerobic main aeration zone II.
5. outlet sump V
Filter the back water outlet and get into outlet sump V, discharging or reuse.
Equipment such as surface-type strainer involved in the present invention, aerator, whisking appliance all can adopt equipment well known in the art.
Test Example
With certain sanitary sewage disposal engineering is example, and the applicable cases that nitrogen and phosphorus removal bio of the present invention is handled with the Sewage treatment systems of filtering integral describes test.
Certain WWT project, water inlet is main with sewage, water yield 1000m
3/ d.The water inlet Pollutant levels are following:
Table 1 Pollutant levels index
| Project | COD | BOD | SS | Ammonia nitrogen | TN | TP |
| Index | 350 | 150 | 200 | 35 | 40 | 4 |
Anoxic pond, aerobic main aeration tank and the total useful volume 520m of aerobic solid-liquid displacement zone
3, anoxic pond useful volume 104m wherein
3, 4 meters of the depth of waters, HRT2.5h, aerobic solid-liquid separation tank useful volume 104m
3, reflux ratio 150%, upflow velocity 4m/h, 4 meters of the depth of waters, aerobic main aeration zone useful volume 312m
3Filtering unit adopts fibre turntable strainer, 2 meters of filter disc diameters, 2 of quantity, effective filtration area 10.4m
2, filtering velocity 10m/h.Through after each processing unit processes, treat effluent pollutent changing conditions is following:
Each processing unit water outlet situation of table 2
| Project | ?COD | BOD | SS | Ammonia nitrogen | TN | TP |
| Water inlet | ?350 | 150 | 200 | 35 | 40 | 4 |
| The anoxic pond water outlet | ?180 | 70 | - | 14 | 20 | 2.2 |
| Aerobic solid-liquid displacement zone water outlet | ?60 | 10 | 30 | 5 | 20 | 1.5 |
| Filter water outlet | ?50 | 10 | 10 | 5 | 20 | 1 |
Wherein to go out water concentration relevant with carbon source for TN, and in this project, water outlet requires " urban wastewater treatment firm pollutant emission " one-level B standard, therefore do not consider additional carbon.Go out water concentration if require to continue to reduce TN, can consider to increase additional carbon, TN goes out water concentration and can be controlled at about 15mg/L.
Though, the present invention has been done detailed description in the preceding text with general explanation and specific embodiments, on basis of the present invention, can to some modifications of do or improvement, this will be apparent to those skilled in the art.Therefore, these modifications or the improvement on the basis of not departing from spirit of the present invention, made all belong to the scope that requirement of the present invention is protected.
Claims (9)
1. a nitrogen and phosphorus removal bio is handled and the Sewage treatment systems of filtering integral; It is characterized in that; By effluent stream to comprising successively: reaction tank, aerobic main aeration tank, be provided with the aerobic solid-liquid separation tank and the filtering basin of triphase separator; Said aerobic solid-liquid separation tank links to each other through pipeline with said reaction tank, said aerobic main aeration tank respectively, is used to provide returned sluge; Said reaction tank is anoxic pond or anaerobism anoxic pond; Said anaerobism anoxic pond is made up of anaerobic pond and anoxic pond.
2. Sewage treatment systems according to claim 1 is characterized in that, is provided with whisking appliance in the said reaction tank.
3. Sewage treatment systems according to claim 1 is characterized in that, in the said aerobic main aeration tank, in the said aerobic solid-liquid separation tank aerator is set respectively.
4. according to the said Sewage treatment systems of claim 1, it is characterized in that, surface-type strainer and aerator are set in the said filtering basin.
5. according to the said Sewage treatment systems of claim 4, it is characterized in that the filtration medium of said surface-type strainer adopts fiber medium or adopts metal medium, surface load 5-10m/h.
6. according to the said Sewage treatment systems of claim 1, it is characterized in that said Sewage treatment systems also comprises grid treating pond and settling pit before reaction tank.
7. adopt the method for any said system handles sewage of claim 1-6, it is characterized in that it may further comprise the steps:
1) sewage is introduced into reaction tank, mixes with returned sluge from aerobic solid-liquid separation tank, carries out anaerobic phosphorus release and anti-nitration reaction;
2) water outlet of reaction tank gets into aerobic main aeration tank again, accomplishes oxidation operation and nitration reaction;
3) aerobic main aeration tank water outlet gets into aerobic solid-liquid separation tank, continues to accomplish nitration reaction, and accomplishes preliminary gas, liquid, solid sepn process through triphase separator; Returned sluge is back to reaction tank from aerobic solid-liquid separation tank;
4) aerobic solid-liquid separation tank water outlet gets into the filtering basin filtration and discharges, and filters backwashing water and is back to reaction tank.
8. sewage water treatment method according to claim 7 is characterized in that, in the step 1), the ratio of returned sluge and water inlet is 100-300%.
9. according to claim 7 or 8 described sewage water treatment methods, it is characterized in that, in the step 3), the flow velocity 1-4m/h that rises overally of said triphase separator; In the step 4), filtering filtering velocity 1-10m/h.
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| CN103408194B (en) * | 2013-08-18 | 2014-06-18 | 武汉宝捷能环境工程技术有限公司 | Small sewage treatment hydrolysis and gas-stripping and precipitation technique method |
| CN104710084B (en) * | 2015-04-02 | 2017-10-10 | 四川省科学城天人环保有限公司 | A kind of high-efficiency biomembrane integrated sewage treating apparatus |
| CN106007178A (en) * | 2016-06-17 | 2016-10-12 | 阿斯旺（北京）环保科技有限公司 | Distributed and structured town sewage pelletization treatment process and pelletization reactor |
| CN108793599B (en) * | 2018-06-15 | 2021-04-30 | 中建三局第一建设工程有限责任公司 | Low-concentration organic sewage treatment system |
| CN109970193B (en) * | 2019-04-15 | 2024-04-09 | 浦华环保有限公司 | Enhanced denitrification device and equipment |
| CN110510815B (en) * | 2019-08-27 | 2022-07-22 | 危杏 | Integrated sewage treatment device based on simultaneous nitrification and denitrification and sewage treatment method |
| CN113213694A (en) * | 2020-12-17 | 2021-08-06 | 云南中贸环境节能科技投资股份有限公司 | Microbial carrier system for sewage treatment and process method |
| CN113461253A (en) * | 2021-04-19 | 2021-10-01 | 安徽普氏生态环境工程有限公司 | Mud-water separation device and sewage treatment method |
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