CN103496787A - Biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage - Google Patents
Biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage Download PDFInfo
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- CN103496787A CN103496787A CN201310429788.3A CN201310429788A CN103496787A CN 103496787 A CN103496787 A CN 103496787A CN 201310429788 A CN201310429788 A CN 201310429788A CN 103496787 A CN103496787 A CN 103496787A
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Abstract
The invention relates to a biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage. Sewage passes through a grating and a primary settling tank at first so that partial suspended solids are removed, next, the sewage passes through an anaerobic filter tank loaded with iron carbon filler and an aerobic filter tank, the effluent of the aerobic filter tank flows back to the anaerobic filter tank, organic matters in the sewage in the anaerobic state are acidified so that the pH is reduced, an electrochemical reaction is aroused on the surface layer of the iron carbon filler to intensify denitrification, and in the meantime, few ferrous ions (Fe<2+>) are dissolved out; the ferrous ions (Fe<2+>) are oxidized into ferric ions (Fe<3+>) in the aerobic state, the ferric ions react with soluble phosphate radicals in the sewage to generate precipitate, and finally, the sewage enters a sedimentation basin and is gravitationally settled, and then emitted. The biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage, provided by the invention, has the advantages that no reagent needs to be fed independently to remove phosphorus, and only by virtue of the biochemical method, the COD (Chemical Oxygen Demand) in the yielding water is lower than 30 mg/L, TN (Total Nitrogen) in the yielding water is 1.5 mg/L and TP (Total Phosphorus) in the yielding water is 0.2 mg/L, and consequently, the yielding water is up to the class IV water standards of surface water. Furthermore, the biochemical simultaneous phosphorus and nitrogen removal method of domestic sewage is simple in process, and capable of saving investment and operation costs, and thus has a great application value.
Description
Technical field
The biochemical synchronous denitrification and dephosphorization method of one way of life sewage, relate to the treatment process of one way of life sewage.Belong to sewage disposal denitrification dephosphorization technique field.
Background technology
Since the Blue Algae Event outburst of Taihu Lake, eutrophication causes that lake water quality worsens and then threatens safe drinking water, has caused the great attention of governments at all levels and environmental administration.Eutrophication arch-criminal is nitrogen, phosphorus, and along with " urban wastewater treatment firm pollutant emission standard " " one-level A " standard implementation and popularization (GB18918-2002), denitrogenation dephosphorizing becomes sewage treatment area core competition technology gradually.
Denitrification dephosphorization technique mainly contains biochemical process, physico-chemical process and Physiochemical and biochemical coupling method.
Biological carbon and phosphorous removal is current main stream approach.Under excess oxygen, the ammonia in waste water is oxidized to nitrate (nitrifying process), and the phosphorus that polyP bacteria absorbs in waste water is stored in (suction phosphorus) in body to gather the phosphorus form; Under anoxia condition, the nitrate transformation in waste water is that nitrogen is got rid of (denitrification); Under anaerobic condition, poly-phosphorus decomposes the release inorganic phosphorus and (release phosphorus) to mud.The function of biological carbon and phosphorous removal is the comprehensive of organic matter removal, denitrogenation, three kinds of functions of dephosphorization, thereby its processing parameter should meet the requirement of three kinds of functions simultaneously.If denitrogenation or dephosphorization effectively generally also can be removed BOD simultaneously efficiently
5.But dephosphorization and denitrogenation are conflicting often, are embodied on some parameter, and these parameters can only be confined in a certain narrow scope.And, because the biochemical process mud-water separation is not thorough, water outlet unavoidably contains suspension microorganism, make that the water outlet concentration of nitrogen and phosphorus is minimum can only reach one-level B standard, one-level A becomes very close technical bottleneck.
The physico-chemical process dephosphorization is mainly by additionally adding aluminium salt, molysite etc. by chemical precipitation and Adsorption TP, and physico-chemical process is general only for the removal of organonitrogen except TN, for nitric nitrogen and nitrite nitrogen, there is no unusual effect.Because physico-chemical process need to additionally add medicament and increase power-equipment, the operation price is more biochemical high, and general and biochemical process coupling, as advanced treatment.
Biological filter is the granule filter material in the in-built raising specific surface area of bio-reactor, so that the carrier of microbial film growth to be provided, and lower to stream or upward flow to being divided into according to the various flows of sewage, sewage flows through filter material layer from top to bottom or from bottom to top, organism and filling surface microbial film in sewage are removed by biochemical reaction, and filtrate plays the physical filtering effect simultaneously.The characteristics of biological filter maximum are to integrate bio-oxidation and hold back suspended solids, follow-up secondary sedimentation basins and sludge reflux have been saved, under the prerequisite that guarantees treatment effect, make treatment process simplify, BAF has the characteristics such as volumetric loading is high, hydraulic load is large, hydraulic detention time is short, required initial cost is few, floor space is little, the processing effluent quality is good, again because biological filter does not have the sludge bulking problem, microorganism can not run off, can keep higher biological concentration, so daily administration is simple.
But still there is the filter tank blockage problem in ordinary biofilter and the pollution problem that microbial film causes that comes off, usually water inlet SS is had relatively high expectations and water outlet nitrogen, phosphorus (phosphorus is not removed substantially) up to standard simultaneously.And the biological filter volumetric loading is lower, usually and the activated sludge process coupling as advanced treatment.
Summary of the invention
The biochemical synchronous denitrification and dephosphorization method that the objective of the invention is open one way of life sewage.
In order to achieve the above object, the present invention is performed such:
Sanitary sewage first enters pump well except after the partial suspended thing in advance with grid and preliminary sedimentation tank, sanitary sewage in pump well is successively through anaerobic filter and aerobic filter tank, in anaerobic filter and aerobic filter tank, iron-carbon filling material respectively is housed, aerobic filter tank effluent recycling is to anaerobic filter, reflux ratio is 50%, enter organism in the sanitary sewage in anaerobic filter, under anaerobic state, acidifying occurs, make water body pH in anaerobic filter drop to 5.8-6.2, in anaerobic filter, electrochemical reaction occurs in the iron-carbon filling material top layer, strengthen on the one hand microorganism denitrification in sanitary sewage, the a small amount of ferrous ion of stripping on the other hand, enter behind aerobic filter tank under good oxygen condition ferrous ion in sanitary sewage and be oxidized to iron ion, iron ion reacts with dissolved phosphorus acid group in sanitary sewage and generates precipitation, thereby the concentration of Phosphorus in Domestic Wastewater with Pulverized is reduced, finally enter settling tank, after gravitational settling, effluent quality COD is 12mg/L, and TN is 1.5mg/L, and TP is 0.2mg/L, reaches surface water IV class water body standard, and discharge utilizes, and settling tank bottom mud is discharged the system spoil disposal by mud,
Above-mentioned sanitary sewage is residence time 1.5h in anaerobic filter, residence time 3h in aerobic filter tank, and aerobic filter tank adopts the micro porous aeration head aeration, and gas-water ratio is 10:1;
Above-mentioned pump well residence time 0.5h, to guarantee that pump working is normal and to reduce the settling tank disturbance;
Above-mentioned preliminary sedimentation tank adopts flat flow, surface load 1m
3/ m
2h, residence time 3h;
Above-mentioned sanitary sewage COD is that 126mg/L, TN are 28mg/L, and TP is 3.2mg/L, and pH is 6.7.
Described iron-carbon filling material preparation method is iron charcoal micro-electrolysis stuffing preparation method with reference to denomination of invention, the patent No. is that ZL200910198816.9 carries out: first with particle diameter be less than 60 purpose iron filings, particle diameter is less than 100 purpose Powdered Activated Carbons as raw material, measure iron: charcoal=(10～13): 1 mass ratio, be pressed into the spherical blank that sphere diameter is 8～3mm by the powder pressure machine under 200kN pressure, the raw material after mixing being added to model, then isolated air quenches and makes after 1050～1200 ℃ of heating 90～100min.
In described anaerobic filter and aerobic filter tank, iron-carbon filling material respectively being housed is, in anaerobic filter, the admission space of iron-carbon filling material is 70% volume percent of anaerobic filter internal volume; In aerobic filter tank, the iron-carbon filling material admission space is 70% volume percent of aerobic filter tank internal volume.
With existing denitrification and dephosphorization method, compare, advantage of the present invention is as follows:
1. owing in anaerobic filter of the present invention and aerobic filter tank, iron-carbon filling material being housed, Aerobic Pond to anaerobic pond arranges backflow simultaneously, organism generation acidifying in sanitary sewage under anaerobic state, the acidic substance that produce make the iron-carbon filling material top layer that micro-electrolysis reaction occur, the part pollutent is removed in enhancement microbiological metabolism on the one hand, the a small amount of ferrous iron ion of stripping on the other hand, ferrous ion is oxidized to iron ion under good oxygen condition, iron ion reacts with phosphate radical and generates precipitation, remove phosphoric acid salt in water body, therefore without adding separately the chemical agent dephosphorization, can make the water outlet concentration of nitrogen and phosphorus reach surface water IV class water body standard, reduced sludge quantity, reduced running cost.
Due to sanitary sewage of the present invention before entering anaerobic filter and aerobic filter tank, do not need to adopt activated sludge process to carry out pre-treatment, do not need to set up medium sediment pool yet, only after the preliminary sedimentation tank gravitational settling is removed suspended substance, directly enter the two-stage filter tank, therefore, there is technical process simple, reduced investment, the advantage such as floor space is little.
3. owing in anaerobic filter of the present invention and aerobic filter tank, iron-carbon filling material being housed, therefore the iron ion that the present invention produces behind anaerobic filter and aerobic filter tank on the one hand can enhancement microbiological metabolism, can generate tertiary iron phosphate with phosphate radical on the other hand, be easy to break away from microbial film and enter after settling tank the existence due to molysite with water outlet, sludge density is higher, the settling property excellence, can thoroughly discharge system by mud, keeping system stability.
4. the present invention arranges internal reflux between anaerobic filter and aerobic filter tank, and reflux ratio is only 50%, and little many (100%～300%) than routine biochemistry denitrogenation reflux ratio reduce reflux pump consumption and energy consumption.
5. because the iron-carbon filling material be equipped with in anaerobic filter of the present invention and aerobic filter tank is to be the filtrate that main raw material develops with iron, charcoal, voidage is large, should not stop up, the oxygenation rate is high, power consumption economizes, therefore compare with ordinary biofilter and do not have the filter tank blockage problem and pollution problem that the microbial film that comes off causes, to water inlet SS require lower and water outlet nitrogen, phosphorus can be simultaneously up to standard.
The accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention
Embodiment
Embodiment 1
The iron-carbon filling material preparation method is ZL200910198816.9 according to the patent No., denomination of invention is iron charcoal micro-electrolysis stuffing preparation method: first with particle diameter be less than 60 order iron filings, particle diameter is less than 100 order Powdered Activated Carbons as raw material, measure iron: charcoal=(10～1): 1 mass ratio, be pressed into the spherical blank of sphere diameter 8～3mm by the powder pressure machine under 200kN pressure, the raw material after mixing being added to model, then isolated air quenches and makes after 1050～1200 ℃ of heating 90～100min.
Again the above-mentioned iron-carbon filling material prepared is respectively charged in anaerobic filter and aerobic filter tank.
In anaerobic filter, the iron-carbon filling material admission space is 70% volume percent of anaerobic filter internal volume.
In aerobic filter tank, the iron-carbon filling material admission space is 70% volume percent of aerobic filter tank internal volume.
Embodiment 2
Take from certain municipal sewage plant's water inlet: COD is that 126mg/L, TN are 28mg/L, and TP is 3.2mg/L, and pH is 6.7.First with grid and preliminary sedimentation tank, enter pump well except after the partial suspended thing in advance, preliminary sedimentation tank is rectangular sedimentation tank, its surface load 1m
3/ m
2.h, residence time 3h, then stop 0.5h at pump well, to guarantee that pump working is normal and to reduce the rectangular sedimentation tank disturbance.Then the sanitary sewage in pump well enters anaerobic filter and aerobic filter tank successively, aerobic filter tank effluent recycling is to anaerobic filter, and reflux ratio is 50%, and anaerobic filter adopts the micro porous aeration head aeration, gas-water ratio is 10:1, at anaerobic filter residence time 1.5h, at aerobic filter tank residence time 3h, water outlet effluxes after the settling tank gravitational settling, COD through the detection effluent quality is 12mg/L, TN is 1.5mg/L, and TP is 0.2mg/L, reaches surface water IV class water body standard.Settling tank bottom mud discharges by mud discharge system.
Claims (3)
1. the biochemical synchronous denitrification and dephosphorization method of one way of life sewage, it is characterized in that: sanitary sewage first enters pump well except after the partial suspended thing in advance with grid and preliminary sedimentation tank, then the sanitary sewage in pump well is successively through anaerobic filter and aerobic filter tank, in anaerobic filter and aerobic filter tank, iron-carbon filling material respectively is housed, aerobic filter tank effluent recycling is to anaerobic filter, reflux ratio is 50%, acidifying occurs in the organism entered in the sanitary sewage in anaerobic filter under anaerobic state, make water body pH in anaerobic filter drop to 5.8-6.2, in anaerobic filter, electrochemical reaction occurs in the iron-carbon filling material top layer, strengthen on the one hand microorganism denitrification in sanitary sewage, the a small amount of ferrous ion of stripping on the other hand, enter behind aerobic filter tank under good oxygen condition ferrous ion in sanitary sewage and be oxidized to iron ion, iron ion reacts with dissolved phosphorus acid group in sanitary sewage and generates precipitation, thereby the concentration of Phosphorus in Domestic Wastewater with Pulverized is reduced, finally enter settling tank, after gravitational settling, effluent quality COD is 12mg/L, and TN is 1.5mg/L, and TP is 0.2mg/L, reaches surface water IV class water body standard, and discharge utilizes, settling tank bottom mud is discharged the system spoil disposal by mud and is put,
Above-mentioned sanitary sewage is residence time 1.5h in anaerobic filter, residence time 3h in aerobic filter tank, and aerobic filter tank adopts the micro porous aeration head aeration, and gas-water ratio is 10:1;
Above-mentioned sanitary sewage is at pump well residence time 0.5h;
Above-mentioned preliminary sedimentation tank adopts rectangular sedimentation tank, and its surface load is 1m
3/ m
2h, residence time 3h;
Above-mentioned sanitary sewage COD is that 126mg/L, TN are 28mg/L, and TP is 3.2mg/L, and pH is 6.7.
2. the biochemical synchronous denitrification and dephosphorization method of one way of life sewage according to claim 1, it is characterized in that: described iron-carbon filling material preparation method is iron charcoal micro-electrolysis stuffing preparation method with reference to denomination of invention, the patent No. is that ZL200910198816.9 carries out: first with particle diameter, be less than 60 purpose iron filings, particle diameter is less than 100 purpose Powdered Activated Carbons as raw material, measure iron: charcoal=(10～13): 1 mass ratio, be pressed into the spherical blank that sphere diameter is 8～3mm by the powder pressure machine under 200kN pressure, the raw material after mixing being added to model, then isolated air quenches and makes after 1050～1200 ℃ of heating 90～100min.
3. the biochemical synchronous denitrification and dephosphorization method of one way of life sewage according to claim 1, it is characterized in that: in described anaerobic filter and aerobic filter tank, iron-carbon filling material respectively being housed is, in anaerobic filter, the iron-carbon filling material volume is 70% volume percent of anaerobic filter internal volume; In aerobic filter tank, the iron-carbon filling material volume is 70% volume percent of aerobic filter tank internal volume.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016547A (en) * | 2014-06-19 | 2014-09-03 | 中冶建筑研究总院有限公司 | Advanced treatment and zero emission process for coking wastewater |
| CN104787880A (en) * | 2015-04-21 | 2015-07-22 | 同济大学 | Short-cut denitrification process adopting catalytic iron and biological coupling |
| CN105384311A (en) * | 2015-12-09 | 2016-03-09 | 浦华环保股份有限公司 | Method for processing high concentration comprehensive municipal sewage and apparatus thereof |
| CN106007200A (en) * | 2016-07-04 | 2016-10-12 | 宜兴市永加化工有限公司 | Method for treating wastewater |
| CN106630393A (en) * | 2016-11-29 | 2017-05-10 | 四川悦承环保节能科技有限公司 | Unattended IFAS or MBBR sewage treatment integrated equipment and system |
| CN107445415A (en) * | 2017-09-28 | 2017-12-08 | 中冶华天工程技术有限公司 | A kind of rural domestic sewage treatment system |
| CN107892388A (en) * | 2017-11-14 | 2018-04-10 | 东华大学 | A kind of dyeing waste water advanced treating integration denitrification removes carbon dephosphorization process and device |
| CN109095604A (en) * | 2018-11-08 | 2018-12-28 | 正丰源生物科技（苏州）有限公司 | A kind of composite bio-chemical degassing tower |
| CN110902948A (en) * | 2019-11-29 | 2020-03-24 | 北京林业大学 | Rural distributed domestic sewage treatment process and system for strengthening phosphorus removal and recovery |
| CN111439897A (en) * | 2020-05-09 | 2020-07-24 | 四川省生态环境科学研究院 | Economical electrochemical dephosphorization process |
| CN113526667A (en) * | 2021-08-21 | 2021-10-22 | 昆明理工大学 | Technical method for anaerobic enhanced biological phosphorus removal of sewage treatment plant |
| CN114044609A (en) * | 2021-11-19 | 2022-02-15 | 江苏力鼎环保装备有限公司 | AO device and AO technology for efficiently removing nitrogen and phosphorus |
| CN116002896A (en) * | 2022-12-22 | 2023-04-25 | 重庆大学 | Sewage water quality purification system and method |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104016547A (en) * | 2014-06-19 | 2014-09-03 | 中冶建筑研究总院有限公司 | Advanced treatment and zero emission process for coking wastewater |
| CN104016547B (en) * | 2014-06-19 | 2016-01-20 | 中冶建筑研究总院有限公司 | A kind of coking waste water deep treatment zero-emission process |
| CN104787880A (en) * | 2015-04-21 | 2015-07-22 | 同济大学 | Short-cut denitrification process adopting catalytic iron and biological coupling |
| CN105384311A (en) * | 2015-12-09 | 2016-03-09 | 浦华环保股份有限公司 | Method for processing high concentration comprehensive municipal sewage and apparatus thereof |
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| CN106630393A (en) * | 2016-11-29 | 2017-05-10 | 四川悦承环保节能科技有限公司 | Unattended IFAS or MBBR sewage treatment integrated equipment and system |
| CN107445415A (en) * | 2017-09-28 | 2017-12-08 | 中冶华天工程技术有限公司 | A kind of rural domestic sewage treatment system |
| CN107892388A (en) * | 2017-11-14 | 2018-04-10 | 东华大学 | A kind of dyeing waste water advanced treating integration denitrification removes carbon dephosphorization process and device |
| CN107892388B (en) * | 2017-11-14 | 2021-03-05 | 东华大学 | Integrated nitrogen and carbon removal and phosphorus removal process and device for advanced treatment of printing and dyeing wastewater |
| CN109095604A (en) * | 2018-11-08 | 2018-12-28 | 正丰源生物科技（苏州）有限公司 | A kind of composite bio-chemical degassing tower |
| CN110902948A (en) * | 2019-11-29 | 2020-03-24 | 北京林业大学 | Rural distributed domestic sewage treatment process and system for strengthening phosphorus removal and recovery |
| CN111439897A (en) * | 2020-05-09 | 2020-07-24 | 四川省生态环境科学研究院 | Economical electrochemical dephosphorization process |
| CN111439897B (en) * | 2020-05-09 | 2022-03-22 | 四川省生态环境科学研究院 | Economical electrochemical dephosphorization process |
| CN113526667A (en) * | 2021-08-21 | 2021-10-22 | 昆明理工大学 | Technical method for anaerobic enhanced biological phosphorus removal of sewage treatment plant |
| CN114044609A (en) * | 2021-11-19 | 2022-02-15 | 江苏力鼎环保装备有限公司 | AO device and AO technology for efficiently removing nitrogen and phosphorus |
| CN116002896A (en) * | 2022-12-22 | 2023-04-25 | 重庆大学 | Sewage water quality purification system and method |
| CN116002896B (en) * | 2022-12-22 | 2024-04-19 | 重庆大学 | Sewage water quality purification system and method |
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Application publication date: 20140108 |