CN102964037A - Novel sewage treatment method by combined utilization of light filter material biological aerated filter and heavy filter material biological aerated filter - Google Patents
Novel sewage treatment method by combined utilization of light filter material biological aerated filter and heavy filter material biological aerated filter Download PDFInfo
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- CN102964037A CN102964037A CN2012105259668A CN201210525966A CN102964037A CN 102964037 A CN102964037 A CN 102964037A CN 2012105259668 A CN2012105259668 A CN 2012105259668A CN 201210525966 A CN201210525966 A CN 201210525966A CN 102964037 A CN102964037 A CN 102964037A
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Abstract
The invention relates to a novel sewage treatment method by combined utilization of a light filter material biological aerated filter and a heavy filter material biological aerated filter, relates to the technical field of sewage treatment biochemistry, and further optimizes the performance parameters of a single light filter material biological filter and a single heavy filter material biological filter. According to the method, process equipment mainly comprises the heavy filter material biological filter taken as a CN tank, the light filter material biological filter taken as an N tank, and another heavy filter material biological filter taken as a DN tank, wherein the heavy filter material biological filters are respectively taken as the CN tank and the DN tank and are arranged in front of and behind the N tank. According to the equipment, the heavy filter material biological tanks are utilized for treating sewage with relatively heavy pollutant load, so that the majority of COD (Chemical Oxygen Demand), ammonia nitrogen and the like are removed by utilizing aerobic nitration of the sewage; the light filter material biological filter is used as the N tank to further conduct aerobic nitration and degradation, so that the backwashing period of the tank is shortened, the backwashing process parameters are simplified, and the comprehensive bearing capacity of the N tank is improved; and finally, the heavy filter material biological filter tanks conduct anaerobic denitrification so as to further conduct denitrogenation and degradation on organic matters. According to the process method, the process parameters of the two biological filters are optimized, the defects when the biological filters are used singly can be compensated, and the sewage treatment method has the advantages of high treatment load, small occupied space, stable running, low cost and the like.
Description
Technical field
The present invention relates to a kind of bioremediation in the sewage treatment project, utilize the synergy of two kinds of dissimilar BAF, Optimizing Process Parameters has been strengthened the removal effect of removal of carbon and nitrogen.
Background technology
Heavy filtrate (proportion greater than 1 sintering filtrate) biological filtering tank process is a kind of upflow type aerating biological filter, has oxidative degradation, biological treatment, holds back the function of suspension, and collection biological action and solid-liquid separation act on one, do not establish second pond after not needing.Its bottom be the mixing wastewater with air chamber, on be strainer head, aeration tube, bed course, filtrate.The main relative density that adopts is greater than 1 individual layer biofilter material in the filter tank, and filtrate is compaction state when filtering.Water distribution adopts filter during normal operation, and gas distribution adopts special-purpose air distribution head, air water co-flow, and with higher filtering velocity filtration.Adopt combined water and air backwash, mainly utilize the scrubbing action of gas.It not only has the advantage of biomembrane process technology, also plays the effect of filter tank, effective space simultaneously.Its influent COD mass concentration allows to reach 1000-1200mg/l, and the COD organic loading can reach 8kg/ (m
3D).
Light filter material (proportion less than 1 polystyrene filtrate) biological filtering tank process is a kind of submerged up-flow biological filter, and the difference of it and heavy filtrate biological filtering tank process maximum is its spheroidal particle filtrate that adopts proportion little 1, and this filtrate swims in the water.For only carrying out nitrated light filter material biological filter, the position of aeration tube is arranged on the bottom, filter tank.The light filter material biological filtering tank process has the following advantages: 1. can simplify the backwash technique parameter, adopt the run by gravity back flushing to need not recoil pump, save power; 2. filter is arranged in the top, filter tank, and the pretreated water contact is difficult for stopping up, and is convenient to change; 3. the light filter material biological filtering tank process bears the sewage load apparently higher than activated sludge process.But this technique is for the higher sewage of Pollutant levels, because light filter material easily bonds, resistance increment is fast, backwashing period shortens, and the run by gravity back flushing often exists the halfway shortcoming of back flushing, and backwash also can be taken away the suspended substance that is detained between a part of outer microbial film and a large amount of filtrate, and the space increases suddenly between filtrate, functional flora quantity on the filtrate can fall sharply, and effluent quality can temporary variation after backwash finished.And, frequently backwash, water consumption is large, and running cost increases.The light filter material that uses in the light filter material biological filtering tank process is high than other types filtrate processing requirement, and filtrate is in compressed state, is not easy to the even distribution of aqueous vapor, easily forms short stream and dead band.
The nitrated biological filter of tradition carbonization (being called for short the CN pond)-denitrification bio-filter (being called for short the DN pond) is owing to device arranges, often there is the large easily obstruction of denitrification rate in the problem that technical parameter exists, and the problems such as floor space is large, the present invention utilizes the synergy of two kinds of dissimilar BAF of light filter material and heavy filtrate, pass through Optimizing Process Parameters, solve simultaneously the above-mentioned shortcoming that light filter material biological filtering tank process and CN-DN technique exist, the present invention adopts the nitrated heavy filtrate of carbonization biological filter, nitrated light filter material biological filter (being called for short the N pond) and denitrification heavy filtrate biological filter combined process (referred to as: CN-N-DN), its invention principle is the one-level water inlet, load is high, pollutant load is high, and be not suitable for the growth of denitrifying bacteria, therefore use the biological filtering tank process of heavy filtrate as the aerobic nitrification pond.Secondary process adopts the light filter material biological filtering tank process, is based on this section suspended substance, COD content is moderate, and light filter material biological filtering tank process processing efficiency is high, is difficult for stopping up.The biological filtering tank process of three grades of process using heavy filtrates is as the anaerobic denitrifying pond, this moment, water pollutant content was less, filtering velocity is high, but the biological filtering tank process of light filter material produces obstruction easily, light filter material is large at the pond Wave, cause denitrification process unstable, what therefore adopt is heavy filtrate type biological filter.It is high that the inventive method has a load, take up an area little, stable, low cost and other advantages.
Summary of the invention
The object of the present invention is to provide the biochemical water treatment method of a kind of CN-N-DN, Optimizing Process Parameters has overcome the shortcoming in traditional single light, heavy filtrate biological filter.Concrete technical scheme is as follows:
A kind of lightweight and heavy filler in aerated biologic filter pool are united the biochemical processing method of use, its process mainly comprises to be processed the elementary oettIed sewage of process respectively by CN pond, N pond, DN pond (CN-N-DN), wherein the heavy filler in aerated biologic filter pool is used respectively in CN pond and DN pond, aeration biofilter with lightweight filter material is used in the N pond, the water outlet in three ponds lays respectively at the device top, all adopts the run by gravity mode to be connected with the water-in of next device.
Above-mentioned biochemical processing method by regulating CN and DN pond bottom filter, filter plate quantity, is optimized filtration area, and making CN pond filtering velocity is 5-10m/h, and DN pond filtering velocity is 25-30m/h.
The heavy filtrate is laid at supporting layer in CN in the above-mentioned biochemical processing method, DN pond.CN pond filtrate is selected the biological sintering filtrate of particle size range 1-3mm, and DN selects in the pond the biological sintering filtrate of particle size range 3-6mm; Water distribution layer top light filling filtrate in the N pond is selected the polystyrene spheres of particle diameter 3-5mm, and filter material surface is coated with the microbial film of aerobic nitrification bacterium.
Two aeration collectors of bottom, CN pond configuration in the above-mentioned biochemical processing method, one is the aeration tube of nitrated aerobic usefulness, and wherein aeration head is single-hole membrane aerator, and another root is the back flushing pipeline; The back flushing pipeline is only established in the DN pond, and the combined water and air backwash mode is all adopted in CN pond and DN pond, and the bottom is provided with an aerated conduit in the N pond, need not to arrange backwash tube, namely uses the run by gravity mode not intake by upper, the mode back flushing of bottom water outlet.
The semi-underground type skeleton construction is all adopted in CN pond in the above-mentioned biochemical processing method, N pond, DN pond, and aboveground space takies less.
The combined water and air backwash mode is adopted in CN in the above-mentioned biochemical processing method, DN pond, during back flushing, close pond body low side water-in, aeration tube, backwashing water, gas are the aging biofilm detachment of filter material surface under the effect of backwashing pump from the bottom, pond from bottom to top all, flowing into the backwashing water water leg stores, when treating that device normally moves, mix with former water; The run by gravity back flushing is adopted in the back flushing of N pond, during back flushing, closes into water, inlet mouth, uses 5-10% to process water back flushing from top to bottom, and backwashing wastewater exports through pond body bottom backwashing water and flows out, and again sneaks in the pending water.
Enter that COD, suspended substance, BOD value will satisfy certain concentration range in the former water of above-mentioned treatment process, the water section that the outlet of DN pond is discharged is back to the CN pond, is used for dilution to come water, reduces organic concentration in the water, and general reflux ratio is no more than 50%.
The CN pond is heavy filtrate biological filter, carries out aeration in this pond, realizes nitrated de-carbon process.Water inlet enters the filtering layer bottom through central draft tube, passes from bottom to top filtering layer (making the filter tank water inlet evenly under the effect of filtering material resistance); The air cloth tracheae is installed in bottom, filtering layer district, and filter material surface is being grown and contained the microbial film of a large amount of microorganisms, and microorganism utilizes the dissolved oxygen in the water degrade a part of organism and ammonia nitrogen, and the suspended matter in the simultaneously water outlet is trapped through media filtration.According to coming the regimen condition, by regulating the quantity of bottom filter, filter plate, optimize filtration area, guarantee that the filtering velocity of filtrate is 5-10m/h; Current are above to enter effluent trough to streamed by the filter screen overflow of top, filtering layer district, is entered in the N pond by the rising pipe gravity flow.
Essence light filter material biological filter, N pond, aeration collector of bottom, pond configuration.Light filling filler in the pond.Organic polymer floating type filler is adopted in light filler, and main component is polystyrene, particle diameter 3-5mm.
Water inlet pipe is positioned at the water distributing area (can be used for simultaneously the eliminating of backwashing water) of bottom, filter tank.Height of filter media layer is 3-3.5m, and filter material surface adheres to a large amount of microorganisms.Concrete filter is arranged at the top, filter tank, prevents the loss of filtrate.Filter is installed on the filter plate, is used for the filter tank water outlet, filter contacts with treated water, prevents that filter from stopping up.
The water of processing through the N pond enters in the DN pond, carries out the denitrification decarburization and denitrogenates processing, and pond type and the CN pond in DN pond are similar, do not establish aeration tube, aeration head at the bottom of the pond, and the design filtering velocity is 25-30m/h.
The heavy filtrate biological filtering tank process in CN and DN pond, it comprises water leg, sintering filtrate back flushing inlet mouth, back flushing water-in, be provided with aeration supervisor, aeration branch pipe, aeration inlet mouth, boring aeration hole in the CN pond, be large lattice districts such as a plurality of grades by baffle for separating, concrete lattice number will arrange according to the project situation.Apparatus body is respectively buffering water distribution layer from bottom to top, supporting layer, and filter material layer, exhalant region, water leg is positioned at exhalant region, and the aeration inlet mouth is positioned at the sintering filter material layer in the CN pond, and filter material layer connects the aeration supervisor, and the aeration supervisor connects aeration branch pipe; Back flushing inlet mouth and back flushing water-in are arranged on the bottom of aeration tank.
CN, DN pond filter material layer adopt the biological sintering filtrate of heavy filtrate, and bed stuffing height is about 3m, and body bottom in pond is provided with supporting layer, are used for the support filtrate, adopt pebbles, and laying depth is about 30cm.
CN pond particle diameter of filter medium scope is 1-3mm, and DN pond particle diameter of filter medium scope is 3-6mm.
Sintering filtrate below is provided with filter plate, adopts strainer head and single-hole membrane aerator distribute water and air in the CN pond.Aeration tube is connected with Root's blower outside.
Light filter material adopts polystyrene spheres in the N pond, and particle diameter is about 3-5mm.
Along with the carrying out of filtering, the new biomass that produces of filter material surface is more and more, and the suspended substance of holding back constantly increases, and forms surperficial colmatation zone on filtering layer top, stops the release of bubble, thereby causes head loss to be risen rapidly, should carry out immediately back flushing regeneration this moment.Backwashing water is water up to standard after treatment.After the back flushing, filtering layer has slight expansion, and between the fluid scouring of filler and filler mutually under the mutual friction, aging microbial film and the suspended substance that is trapped separate with filler, are rushed out the filter tank at rinse stage at air water, and backwashing sludge then returns preprocessing part.
Process load for reducing the CN pond, water part, DN pond is back to the CN pond, and reflux ratio is made as 50%.
The present invention is directed to water quality organism and nitrogenous higher former water, be applicable to the stages such as conventional processing, advanced treatment, reusing sewage, use range is extensive, and it is high to process load, and floor space is little, and is stable, and effluent quality is good, and is with low cost.Use technical scheme of the present invention, carry out a biological disposal upon fully, sludge quantity is little, need not to arrange second pond and carries out sludge settling, through being combined with physics, the chemical technology of front, can realize that effluent quality reaches country-level category-A emission standard, even realizes reuse.
| Project | COD | NH 3-N | Suspended substance | Degree up to standard |
| Clearance | 90% | 99% | 90% | Fully up to standard |
Description of drawings
Fig. 1 process flow sheet of the present invention
Fig. 2 N of the present invention pond orthographic plan
Fig. 3 CN of the present invention pond orthographic plan
Embodiment
The invention will be further described below in conjunction with Figure of description:
The present invention has utilized the synergy of two kinds of dissimilar BAF, has optimized processing parameter, has improved the removal effect of COD, BOD, ammonia nitrogen etc. in the sewage.Sewage through elementary precipitation among Fig. 1 enters the CN pond, through the preliminary treatment in CN pond, removes most carbonaceous organic material; Sewage enters the N pond, further removes COD, BOD, ammonia nitrogen and nitrate; Sewage through the N pond enters the DN pond, and the anaerobic denitrifying processing is carried out in the DN pond, will further remove the undegradable COD of the first two device, BOD and nitrogen-containing pollutant.Before the water outlet in DN pond nearly 50% is back to the CN pond, be used for diluting the sewage that enters the CN pond, reduce the processing load in CN pond.Referring to Fig. 2, treatment sewage at first enters the CN pond, lower water inlet, lower air inlet.Come water to be entered in the pond by water inlet pipe 1 gravity flow, Chi Tizhong is respectively buffering water distribution layer 2 from bottom to top, supporting layer, filter material layer 3, exhalant region 4, wherein back flushing inlet pipe 5, water inlet pipe 6 all are positioned at body bottom, pond, and backwashing period is about 5-10 days, supporting layer is used for the biological sintering filtrate of support, selects particle diameter to be about the sintering filtrate of 1-3mm.Come water to carry out water distribution uniformity through strainer head 7, aeration tube adopts single-hole membrane aerator 8, and its position at Chi Tizhong is seen Fig. 2 for details, in packing layer, in the presence of oxygen, the aerobic bacteria ramp of filling surface, and with water in pollutent rapidly in conjunction with, consume, until remove.Treated water enters exhalant region and is discharged by effluent weir 9.The effluent weir next door is provided with backwashing wastewater effluent trough 10, is used for the storage discharging of backwashing wastewater.
The clearance of the COD of the waste water in process CN pond can reach about 60%.Referring to Fig. 3, the water gravity flow of process CN pond effluent trough enters the N pond, is provided with inlet flume 1 in the N pond, and by in the water-in 2 access arrangement bodies of bottom, pond, the N pond is divided into water distributing area from top to bottom, filtrate district, exhalant region by inlet flume in water inlet.Wherein 3 bottoms, filtrate district are provided with aeration tube 4.Wherein, the number needs of filter, aerator is optimized calculating according to project water quality and water yield situation in CN, the N pond.Filtrate adopts light filter material, and for preventing the loss of filtrate, the top is provided with filter plate 5, and filter plate is provided with filter 6, and the water of process filtrate flows into exhalant region through filter, flows out through effluent trough 7.
During back flushing, close water-in, open bottom water outlet 8, use 5-10% to process water and carry out back flushing, backwashing water enters from the top, and flow out the bottom, and backwash gas is from a pipeline shared with aeration tube, and water rinse is used in the alternating individual recoil of aqueous vapor at last.Backwashing equipment is provided with timer, the loss of pressure head detector.
The water outlet of N pond enters the DN pond and carries out denitrification, and DN pond and pond, CN pond body are arranged similar, but lacks the layout of aerated conduit.Selecting sintering pellet particle size range in the DN pond is 3-6mm, regulates filtering velocity at 25-30m/h, and the water 50% of processing through denitrification is back to the front dilution of CN.
The effect of the present invention and four aspects below existing technique is compared main existence: (1) carries out nitrated denitrogenating by add the light filter material biological filter in the middle of CN, DN pond, overcomes the shortcoming that the DN pond is easily stopped up, denitrification rate is low, floor space is large in the traditional C N-DN technique; (2) the present invention passes through preposition heavy filtrate biological filter, significantly reduces and comes organism, ammonia-nitrogen content in the water, has overcome the backwashing period weak point that the light filter material biological filter exists, and the thorough problem of back flushing has been simplified the backwash technique parameter.(3) by the elevation setting between the optimizing equipment, sewage is all adopted from stream mode enter next equipment from a upper equipment, reduced running cost; (4) CN pond, pond, DN pond type are identical, optimize filtering velocity, and the processing parameters such as sewage backflow ratio significantly improve the removal of pollutants effect, the reduction working cost.
Claims (8)
1. a lightweight and heavy filler in aerated biologic filter pool are united the biochemical processing method of use, its method mainly comprises to be processed sewage respectively by CN pond, N pond, DN pond (CN-N-DN), wherein the heavy filler in aerated biologic filter pool is used respectively in CN pond and DN pond, aeration biofilter with lightweight filter material is used in the N pond, the water outlet in three ponds lays respectively at the device top, all adopts the run by gravity mode to be connected with the water-in of next device.
2. the biochemical processing method of claim 1 by regulating CN and DN pond bottom filter, filter plate quantity, is optimized filtration area, and making CN pond filtering velocity is 5-10m/h, and DN pond filtering velocity is 25-30m/h.
3. the biochemical processing method of claim 2, the heavy filtrate is laid at supporting layer in CN wherein, DN pond, CN pond filtrate is selected the biological sintering filtrate of particle size range 1-3mm, DN pond particle size range is 3-6mm, water distribution layer top light filling filtrate in the N pond, the polystyrene spheres of particle diameter 3-5mm, filter material surface are coated with the microbial film of aerobic nitrification bacterium.
4. each biochemical processing method among the claim 1-3, two aeration collectors of bottom, CN pond configuration wherein, one is the aeration tube of nitrated aerobic usefulness, and wherein aeration head is single-hole membrane aerator, and another root is the back flushing pipeline; The back flushing pipeline is only established in the DN pond, and the combined water and air backwash mode is all adopted in CN pond and DN pond, and the bottom is provided with an aerated conduit in the N pond, need not to arrange backwash tube, namely uses the run by gravity mode not intake by upper, the mode back flushing of bottom water outlet.
5. each biochemical processing method among the claim 1-3, the semi-underground type skeleton construction is all adopted in CN pond wherein, N pond, DN pond, and aboveground space takies less.
6. the biochemical processing method of claim 4, the semi-underground type skeleton construction is all adopted in CN pond wherein, N pond, DN pond, and aboveground space takies less.
7. the biochemical processing method of claim 4, the combined water and air backwash mode is adopted in CN wherein, DN pond, during back flushing, close pond body low side water-in, aeration tube, backwashing water, gas are the aging biofilm detachment of filter material surface under the effect of backwashing pump from the bottom, pond from bottom to top all, flow into the backwashing water water leg and store, when treating that device normally moves, mix with former water; The run by gravity back flushing is adopted in the back flushing of N pond, during back flushing, closes into water, inlet mouth, uses 5-10% to process water back flushing from top to bottom, and backwashing wastewater exports through pond body bottom backwashing water and flows out, and again sneaks in the pending water.
8. each biochemical processing method among the claim 1-7, enter wherein that COD, suspended substance, BOD value will satisfy certain concentration range in the former water of above-mentioned treatment process, the water section that the outlet of DN pond is discharged is back to the CN pond, being used for dilution comes water, reduce organic concentration in the water, general reflux ratio is no more than 50%.
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| CN103113005A (en) * | 2013-03-20 | 2013-05-22 | 苏州宜科环保工程有限公司 | Efficient low-consumption domestic sewage treatment technology |
| CN105621606A (en) * | 2016-03-02 | 2016-06-01 | 上海交通大学 | Novel denitrification biological filter with light filtering material |
| CN107487932A (en) * | 2017-07-31 | 2017-12-19 | 江苏天诺环境工程技术开发有限公司 | A kind of high-efficiency sewage handling process |
| CN109987701A (en) * | 2019-03-05 | 2019-07-09 | 大连宇都环境技术材料有限公司 | Water process biochemistry pool and water treatment technology |
| CN111170590A (en) * | 2020-03-03 | 2020-05-19 | 安徽绿衡环保科技有限公司 | Ultra-high-filtration-speed IV-class upgrading modified nitrogen and phosphorus removal device and treatment process thereof |
| CN111186965A (en) * | 2020-03-03 | 2020-05-22 | 安徽绿衡环保科技有限公司 | Sewage upgrading and modifying method adopting ultra-high filtration speed denitrification biological filter system |
| CN111943431A (en) * | 2020-08-11 | 2020-11-17 | 北京林业大学 | Device and method for removing nitrate in underground water based on multi-stage filter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113005A (en) * | 2013-03-20 | 2013-05-22 | 苏州宜科环保工程有限公司 | Efficient low-consumption domestic sewage treatment technology |
| CN105621606A (en) * | 2016-03-02 | 2016-06-01 | 上海交通大学 | Novel denitrification biological filter with light filtering material |
| CN107487932A (en) * | 2017-07-31 | 2017-12-19 | 江苏天诺环境工程技术开发有限公司 | A kind of high-efficiency sewage handling process |
| CN109987701A (en) * | 2019-03-05 | 2019-07-09 | 大连宇都环境技术材料有限公司 | Water process biochemistry pool and water treatment technology |
| CN109987701B (en) * | 2019-03-05 | 2023-10-27 | 大连宇都环境技术材料有限公司 | Water treatment biochemical tank and water treatment process |
| CN111170590A (en) * | 2020-03-03 | 2020-05-19 | 安徽绿衡环保科技有限公司 | Ultra-high-filtration-speed IV-class upgrading modified nitrogen and phosphorus removal device and treatment process thereof |
| CN111186965A (en) * | 2020-03-03 | 2020-05-22 | 安徽绿衡环保科技有限公司 | Sewage upgrading and modifying method adopting ultra-high filtration speed denitrification biological filter system |
| CN111943431A (en) * | 2020-08-11 | 2020-11-17 | 北京林业大学 | Device and method for removing nitrate in underground water based on multi-stage filter |
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