CN101973679B - Distributed sewage treatment and regeneration technology - Google Patents

Distributed sewage treatment and regeneration technology Download PDF

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Publication number
CN101973679B
CN101973679B CN2010105301806A CN201010530180A CN101973679B CN 101973679 B CN101973679 B CN 101973679B CN 2010105301806 A CN2010105301806 A CN 2010105301806A CN 201010530180 A CN201010530180 A CN 201010530180A CN 101973679 B CN101973679 B CN 101973679B
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China
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water
sewage
bed
artificial soil
diffusion cell
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CN2010105301806A
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CN101973679A (en
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成徐州
张猛
赵璇
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Tsinghua University
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Tsinghua University
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Abstract

The invention relates to a distributed sewage treatment and regeneration technology suitable for small towns, belonging to the technical field of water pollution treatment. The technology comprises the following steps: hydrolysis and acidification are carried out on urban sewages firstly; then the processed urban sewages is pumped into an aeration biological fluidized bed through a submersible sewage pump; organic matters in the processed sewages are removed and denitrification is carried out on the sewage subject to organic matter removal by an anoxic zone of the aeration biological fluidized bed; afterwards, the treated sewages enter a sedimentation basin for separating mud from water; suspended matters in the effluent of the sedimentation basin is removed through a rapid sand filter and then the effluent enters a buffer pool; and finally the effluent is further purified in the buffer pool by artificial soil percolation and enters a clean water pond through a collecting pipe. The sewage treatment method features simple technique and stable effluent quality and water quality is in line with reuse of urban recycling water for urban water quality standard for urban miscellaneous water (GB/T 18920-2002).

Description

A kind of decentralized type sewage is handled and reclaiming process
Technical field
The invention belongs to water and pollute processing technology field, the decentralized type sewage that relates in particular to samll cities and towns in a kind of being applicable to is handled and reclaiming process.
Background technology
WWT can be divided into centralized WWT and decentralized type sewage is handled.Distributing is handled and to be meant and to set up the small-sized sewage treating system that integrates pre-treatment, second-stage treatment, advanced treatment, a kind of mode that sewage is handled.Distributing is handled and is begun to receive people's attention and research in last century end, has become a kind of new concept of domestic and international sanitary sewage disposal now.Along with the development and the quickening of urbanization process of Chinese national economy, and the requirement of environmental quality improved constantly, distributing is handled has boundless development space in China.
Compare with centralized WWT mode, distributing is handled has special advantages.At first, the distributing treatment scale is less, helps the Demonstration Application of up-to-date treatment technology, and technology innovation is fast, promotes technological innovation; Secondly, China is much regional, and the economic level of middle samll cities and towns does not possess builds large-scale centralized sewage work and the corresponding condition of drainage facility down, answers first-selected distributing treatment facility; The 3rd, distributing treatment unit energy consumption is low, practices thrift processing costs; The 3rd, distributing is handled the diffusion can effectively reduce objectionable impurities, and the chance of reuse of wastewater is provided, and can also replenish the local underground water of self-restraint, and the environmental influence of WWT is reduced to minimum degree.
The routine techniques of sewage distributing processing at present comprises:
(1) anaerobic-aerobic biologic treating technique combines anaerobism, aerobe treatment technology, can reach not only to remove organism but also remove purpose phosphorous, nitrogenous substances, cuts down the consumption of energy, and reduces sludge quantity.
(2) membrane Bio-reactor Technology; This technology is biological treatment and membrane sepn process combined, because film has high efficiency separation, so effluent quality is good; Can directly reach the required water quality of reuse, in bio-reactor, keep the high-concentration biological amount and improved load.
(3) natural purification.Geographical, weather condition are fit to and the soil can obtain utilizing natural purification systems such as artificial swamp, land percolation, oxidation pond that sewage is handled under the situation, it is stable to have a treatment effect, less investment is managed characteristics such as simple.It is the optimal selection of city suburbs and rural area distributing treatment technology that the soil is handled.
In the aerobe treatment technology of sewage, sewage, mikrobe, oxygen, the mass transfer condition between the three are the key factors of decision reactor efficiency.Compare with traditional biological treatment, aerobic biological fluid-bed living weight is high, and organic loading is high, and hydraulic detention time is short, so equipment volume can reduce greatly, saves floor occupying area and capital cost; There are not sludge bulking or the bed blockage problem in the biological filter in the activated sludge process, stable; Biological fluidized bed also has higher capacity of resisting impact load in addition, and These characteristics makes biological fluidized bed become the treatment process that is fit to municipal effluent distributing treatment requirement.
The artificial soil diafiltration is that ecological principle is combined with the engineering science method and the Ecological Disposal technology of the municipal effluent that forms; Through artificial constructed soil system; Sewage is passed through this system with certain HYDRODYNAMIC CONDITION RELATING TO diafiltration; By physics, chemistry, the biomechanism of soil system, and ecological mechanism that can self-control, hold back, the pollution substance in the absorption, degradation water; Abundant biodegradable organic substance in the degraded and absorbed sewage is realized the innoxious ecological systems engineering with resource utilization of sewage.
The artificial soil diafiltration is by above-mentioned multiple treatment mechanism, and good sewage processing effect has the ecological function of regulating of oneself simultaneously; To coming water water quality, the water yield to have certain surge capability, running status is reliable and stable, and operational administrative is simple; Structure and operation expense are cheap, and the scope of application is extensive.
Summary of the invention
The present invention combines the aeration and biological fluidized-bed with the artificial soil diafiltration, proposed a kind of decentralized type sewage that is suitable for samll cities and towns and handled and reclaiming process.
Technology according to the invention realizes through following steps:
(1) sewage at first gets into hydrolysis acidification pool, and the residence time was controlled at 2.5~3.0 hours; After the sewage hydrolyzing acidifying, get into the aeration and biological fluidized-bed through the submersible sewage pump suction; The aeration and biological fluidized-bed is divided into oxygen-starved area and aerobic zone, by the oxygen-starved area sewage is carried out denitrogenation processing; Sewage flows out back entering settling tank from the aeration and biological fluidized-bed and carries out mud-water separation;
(2) mud of settling tank is back in the aeration and biological fluidized-bed, and the water outlet of settling tank gets into rapid sand filter, removes the suspended particle in the water; The water outlet of rapid sand filter gets into Buffer Pool;
(3) arrange the artificial soil diffusion cell in a side of Buffer Pool, the depth>=5m of this artificial soil diffusion cell, depth of soil>=1m leans on water one side to be set to the slope, and the bottom surface angle of said slope and Buffer Pool is greater than 0 ° and be not more than 45 °; Bottom in the artificial soil diffusion cell is provided with collection tube, and the water outlet of collection tube gets into clean water basin; Filtration velocity≤5m/ days of said artificial soil diffusion cell, hydraulic detention time>=7 day.
The oxygen-starved area of said aeration and biological fluidized-bed and the volumetric ratio of aerobic zone are 1: 3, and hydraulic detention time is 3~6h; Aerobic zone is filled open column shape stereo hollow filler, and DO is controlled at 3~5mg/L, return sludge ratio 200%; Carrier adheres to sludge concentration and maintains 700mg/L~900mg/L.
The back-up sand particle size range of said rapid sand filter is 0.5~1.0mm, and flow rate control is at 3~5m/h.
The soil particle diameter scope of said artificial soil diffusion cell is 0.075~0.5mm; Every at a distance from 8~12 days with the water emptying in Buffer Pool and the artificial soil diffusion cell, removing Buffer Pool bottom sludge is turned over top layer, the artificial soil diffusion cell layer of sand that dries in the air; Turn over the degree of depth >=0.5m that dries in the air, to promote the layer of sand reoxygenation.
Beneficial effect of the present invention is:
(1) municipal effluent at first passes through the acidication pre-treatment, not only can effectively remove COD, BOD 5And SS, can also effectively improve BOD 5/ COD helps follow-up biological treatment.
(2) submersible sewage pump is the bottom of pretreated sewage input aeration and biological fluidized-bed, and with the air thorough mixing that air-distributor by the fluidized-bed bottom gets into, upwards the biomembranous carrier of drive load forms fluidized state.Filler in the biological fluidized bed has bigger specific surface area, the removal organism of effectively degrading.
(3) aeration and biological fluidized-bed water outlet entering settling tank carries out mud-water separation, and the part nitrification liquid refluxes and gets into the biological fluidized bed oxygen-starved area, and the backflow nitrification liquid is reduced into nitrogen under the effect of denitrifying bacterium, realize denitrogenation.The settling tank supernatant gets into rapid sand filter, removes the suspended particle in the water.
(4) the rapid sand filter water outlet is from flowing into Buffer Pool, through the artificial soil diffusion cell.The soil filtration pond residence time is longer, can effectively remove part hardly degraded organic substance and pathogenic micro-organism, and the city miscellaneous water standard of urban sewage reutilization is satisfied in water outlet.
(5) have that to take up an area of province, less investment, running cost low, the advantage that treatment effect is good, the actual demand situation of samll cities and towns is easy to promote the use of in satisfying.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 is the diagrammatic cross-section of Buffer Pool and artificial soil diffusion cell.
Label among the figure:
The 1-hydrolysis acidification pool; The 2-submersible sewage pump; 3-aeration and biological fluidized-bed; The 4-settling tank; The 5-rapid sand filter;
The 6-Buffer Pool; 7-artificial soil diffusion cell; The 8-header; The 9-clean water basin.
Embodiment
The invention provides a kind of decentralized type sewage and handle and reclaiming process, the present invention is further specified below in conjunction with accompanying drawing and embodiment.
As depicted in figs. 1 and 2, technology of the present invention is mainly following steps:
(1) sewage at first gets into hydrolysis acidification pool 1, and the residence time was controlled at 2.5~3.0 hours; After the sewage hydrolyzing acidifying, get into aeration and biological fluidized-bed 3 through submersible sewage pump 2 suctions; Aeration and biological fluidized-bed 3 is divided into oxygen-starved area and aerobic zone, by the oxygen-starved area sewage is carried out denitrogenation processing; The oxygen-starved area of aeration and biological fluidized-bed 3 and the volumetric ratio of aerobic zone are 1: 3, and hydraulic detention time is 3~6h, and aerobic zone DO is controlled at 3~5mg/L, return sludge ratio 200%; Carrier adheres to sludge concentration and maintains 700mg/L~900mg/L; Sewage flows out back entering settling tank 4 from aeration and biological fluidized-bed 3 and carries out mud-water separation;
(2) mud of settling tank 4 is back in the aeration and biological fluidized-bed 3, and the water outlet of settling tank 4 gets into rapid sand filter 5, removes the suspended particle in the water; The back-up sand particle size range of rapid sand filter is 0.5~1.0mm, and flow rate control is at 3~5m/h; The water outlet of rapid sand filter 5 gets into Buffer Pool 6;
(3) arrange artificial soil diffusion cell 7 in a side of Buffer Pool 6; Depth>=the 5m of this artificial soil diffusion cell 7, depth of soil>=1m, the soil particle diameter scope is 0.075~0.5mm; Lean on water one side to be set to the slope, the bottom surface angle of said slope and Buffer Pool 6 is greater than 0 ° and be not more than 45 °; In the bottom of artificial soil diffusion cell 7 collection tube 8 is set, the water outlet of collection tube 8 gets into clean water basin 9; Filtration velocity≤5m/ days of said artificial soil diffusion cell 7, hydraulic detention time>=7 day;
(4) every at a distance from 10 days with the water emptying in Buffer Pool 6 and the artificial soil diffusion cell 7, removing Buffer Pool 6 bottom sludge are turned over the artificial soil diffusion cell 7 top layer layers of sand that dry in the air, and turn over the degree of depth >=0.5m that dries in the air, with enhancement layer of sand reoxygenation.
Following examples use municipal sewage plant's sewage, trade effluent that the aeration and biological fluidized-bed that this technology proposes is tested respectively, on experimental basis, have set up actual sewage treatment project, designing treatment amount 30m 3/ h, water outlet is satisfied urban sewage reutilization-city and is used mixedly water quality standard (GB/T 18920-2002).
Embodiment 1: north, Beijing river Sewage Plant pilot plant test
With the preliminary sedimentation tank water outlet of Beijing north river Sewage Plant as former water, COD in the water Cr=200~450mg/L, BOD 5Be 150~250mg/L, SS is 200~400mg/L, and ammonia nitrogen concentration is 70~90mg/L.Adopt the fluidized-bed process that proposes among the present invention to handle COD in the water outlet Cr≤70mg/L, BOD 5≤20mg/L, SS≤70mg/L, ammonia nitrogen≤15mg/L, the pH of water inlet and water outlet is all in 6~9 scope.
Test finds that the fluidized-bed process in this technology possesses the ability of operation at low temperatures, about 60% the when nitrification activity in the time of 5 ℃ is 18 ℃, and optimal water power standing time is 6h.Test is also observed the microscopic pattern structure of mud in the fluidized-bed.Bacterial species is abundant in the mud, and bacterium is arranged closely, is main with tyrothricin, observes visible coccus, silk bacterium, stock bacterium and protozoon in addition.Electronic Speculum finds that campanularian is a mikrobe main in the mud with waiting limb worm.
Embodiment 2: the trade effluent pilot plant test
Beet sugar manufacture waste water, COD CrBe 1000~5000mg/L, BOD 5Be 500~3000mg/L, SS is 200~1500mg/L, and pH 3.5~7.5.Adopt the fluidized-bed process in this technology to handle, the natural membrane method is adopted in the startup of fluidized-bed, and after the startup, hydraulic detention time is 6h, and volumetric loading is 5.625kgCOD/m 3-d.Aerobic fluidized bed water outlet COD is stabilized in about 350mg/L.
Embodiment 3: the sewage treatment project of actual motion
Tsing-Hua University's nuclear grinds institute, and sewage character is sewage and experiment waste water, designed water 30m 3/ h, influent quality DOC are 5~7mg/L, and UV254 is 15~20m -1, total phosphorus 4~5mg/L, ammonia nitrogen 28~30mg/L, NO 3-N is 3~7mg/L.Adopt technology proposed by the invention to handle, the aeration and biological fluidized-bed is filled novel column cavity filling, and specific surface area reaches 1040m 2/ m 3, steam-water ratio 12.75: 1.Delivery turbidity<1, DOC<3mg/L, UV254 are 10~11m -1, TP<0.05mg/L, ammonia nitrogen 2~5mg/L, NO 3-N is 3~5mg/L.GB/T 18920-2002 water quality standard is satisfied in water outlet, can purposes such as use mixedly as the city.

Claims (4)

1. a decentralized type sewage is handled and reclaiming process, it is characterized in that this technology comprises the steps:
(1) sewage at first gets into hydrolysis acidification pool, and the residence time was controlled at 2.5~3.0 hours; After the sewage hydrolyzing acidifying, get into the aeration and biological fluidized-bed through the submersible sewage pump suction; The aeration and biological fluidized-bed is divided into oxygen-starved area and aerobic zone, by the oxygen-starved area sewage is carried out denitrogenation processing; Sewage flows out back entering settling tank from the aeration and biological fluidized-bed and carries out mud-water separation;
(2) mud of settling tank is back in the aeration and biological fluidized-bed, and the water outlet of settling tank gets into rapid sand filter, removes the suspended particle in the water; The water outlet of rapid sand filter gets into Buffer Pool;
(3) arrange the artificial soil diffusion cell in a side of Buffer Pool, the depth>=5m of this artificial soil diffusion cell, depth of soil>=1m leans on water one side to be set to the slope, and the bottom surface angle of said slope and Buffer Pool is greater than 0 ° and be not more than 45 °; Bottom in the artificial soil diffusion cell is provided with collection tube, and the water outlet of collection tube gets into clean water basin; Filtration velocity≤5m/ days of said artificial soil diffusion cell, hydraulic detention time>=7 day.
2. a kind of decentralized type sewage according to claim 1 is handled and reclaiming process; It is characterized in that the oxygen-starved area of said aeration and biological fluidized-bed and the volumetric ratio of aerobic zone are 1: 3, hydraulic detention time is 3~6h; Aerobic zone DO is controlled at 3~5mg/L, return sludge ratio 200%; Carrier adheres to sludge concentration and maintains 700mg/L~900mg/L.
3. a kind of decentralized type sewage according to claim 1 is handled and reclaiming process, it is characterized in that the back-up sand particle size range of said rapid sand filter is 0.5~1.0mm, and flow rate control is at 3~5m/h.
4. a kind of decentralized type sewage according to claim 1 is handled and reclaiming process; It is characterized in that the soil particle diameter scope of said artificial soil diffusion cell is 0.075~0.5mm, every at a distance from 8~12 days with the water emptying in Buffer Pool and the artificial soil diffusion cell; Remove the Buffer Pool bottom sludge; Turn over top layer, the artificial soil diffusion cell layer of sand that dries in the air, turn over the degree of depth >=0.5m that dries in the air, to promote the layer of sand reoxygenation.
CN2010105301806A 2010-10-29 2010-10-29 Distributed sewage treatment and regeneration technology Expired - Fee Related CN101973679B (en)

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CN103449658B (en) * 2012-06-01 2014-08-06 中国石油天然气股份有限公司 Sewage treatment method
CN103449659B (en) * 2013-07-23 2014-12-24 宁波清天地环境工程有限公司 Novel partial nitrification-denitrification biological nitrogen removal device
CN104528968A (en) * 2014-10-20 2015-04-22 苏州富奇诺水治理设备有限公司 Treatment system for living sewage
CN106045015B (en) * 2016-07-26 2019-02-12 南京柯若环境技术有限公司 A kind of multi-level tubular eddy flow oxygenation biological filter sewage processing system and processing method
CN106145567A (en) * 2016-09-10 2016-11-23 安徽蓝鼎环保能源科技有限公司 A kind of decentralized type sewage processes and regeneration technology
CN108218105A (en) * 2017-11-30 2018-06-29 广西大学 A kind of combined biological sewage disposal and regeneration technology

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