CN103588361B - A kind of chemical/biological reaction synergy removes the method for total phosphorus in waste water - Google Patents
A kind of chemical/biological reaction synergy removes the method for total phosphorus in waste water Download PDFInfo
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- CN103588361B CN103588361B CN201310596642.8A CN201310596642A CN103588361B CN 103588361 B CN103588361 B CN 103588361B CN 201310596642 A CN201310596642 A CN 201310596642A CN 103588361 B CN103588361 B CN 103588361B
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Abstract
The invention discloses the method that a kind of chemical/biological reaction synergy removes total phosphorus in waste water, the present invention is in conjunction with the advantage of chemical dephosphorization with biological phosphate-eliminating, and chemistry and biological phosphate-eliminating act synergistically.By discharging the body refuse that in preaeration tank, high phosphorus containing sludge is formed with the phosphorous throw out based on struvite, the total phosphorus in waste water is removed.Method operation of the present invention is simple, and total tp removal rate is high by 96.8%; While removal total phosphorus, part 30 ~ 40% organic pollutant and nitrogen can also be removed, alleviate the burden of follow-up Aerobic biological process and advanced treatment.
Description
Technical field
The present invention relates to environmental technology field, be specifically related to the method removing total phosphorus in waste water.
Background technology
Water body can make eutrophication process greatly accelerate, it is generally acknowledged that total phosphorus reaches the water body of 0.02mg/L, indicate and be in eutrophic state after polluting by phosphorus.Therefore the content of Phosphorus From Wastewater is an important contamination index, and estimate " 13 " period, phosphorus will include discharge into water performance assessment criteria in comprehensively.
Phosphorus is different from nitrogen, can not form oxidation or Reduction Body, discharge in a gaseous form in air.But phosphoric can be changed between solid-state and solubilised state; Exploitation based on this modality that the method for waste water dephosphorization applies phosphorus just.Current waste water dephosphorization technology roughly comprises two kinds: 1) chemical dephosphorization method: make phosphorus become solid insoluble precipitate, be separated from waste water; 2) biological dephosphorization: phosphorus is absorbed by Institute of Micro-biology with solubilised state, is integrated with microorganism, be separated from waste water with microorganism.
Chemical dephosphorization method comprises two kinds: coagulant sedimentation and crystallization.Coagulant sedimentation suitable treatment total phosphorous lower (being less than 20mg/L), and the secondary clarifier effluent that in waste water, suspended substance (SS) is less.General crystallization points to feeding lime in phosphorus-containing wastewater, and owing to forming hydroxide ion, the pH value of waste water rises, and meanwhile, the phosphorus in waste water and the calcium in lime produce and reacts.Practice shows, the gesture of the phosphorus content in process waste water with pH value rising in logarithm reduction.These two kinds of methods are comparatively suitable to containing low and in waste water, SS the is less deep phosphorous removal technique of organism, take dephosphorization as main purpose.
Biological phosphate-eliminating utilizes polyP bacteria excessively (quantitatively to exceed its physiological requirements) to absorb phosphorus from waste water, and by phosphorus with the storage of the form of polymkeric substance in vivo, form high phosphorus sludge, outside discharge system, reach the object of dephosphorization from waste water.Be exactly polyP bacteria in brief under supporting condition well, excess ingestion phosphorus, under anaerobic discharges phosphorus.
The total tp removal rate of the method is lower, suitable treatment lower concentration total phosphorus (being generally less than 50mg/L) waste water, need to carry out under anaerobic-aerobic condition, operational condition is more complicated, need regularly (mud age at about 7 days) discharge mud, have certain removal effect to organism.
Above-mentioned two kinds of methods respectively have relative merits, all have certain limitation during use.For high organic concentration (COD1000 ~ 5000mg/L), high phosphorus (TP100 ~ 500mg/L) waste water, is used alone chemical process, and reagent consumption is large, and running cost is high, and organism is difficult to reach removal requirement; Be used alone biological method, be difficult to reach total phosphorus, organic matter removal requirement.Content of the present invention is researched and developed based on above-mentioned contradiction just.
Summary of the invention
Technical problem to be solved by this invention is in the shortcoming overcoming above-mentioned prior art, there is provided a kind of chemistry, biological respinse to act synergistically and remove the method for total phosphorus in waste water, the method that the present invention adopts chemical dephosphorization to combine with biological phosphate-eliminating, while removing the total phosphorus in waste water, some organic pollutants and nitrogen can also be removed.
For achieving the above object, technical scheme of the present invention is: a kind of chemical/biological reaction synergy removes the method for total phosphorus in waste water, comprises the following steps:
(1) waste water containing high phosphorus enters in preaeration tank, and wherein suspended solids content (MLSS) is 3000 ~ 4000mg/L, and polyP bacteria is excess ingestion phosphorus under aerobic condition, by oxygenolysis, partial organic substances is decomposed into carbonic acid gas and water and degrades;
(2) measure the content containing nitrogen, phosphorus, magnesium in high phosphorus waste water, by calculating, in preaeration tank, adding nitrogenous, the magnesium material of equal proportion, forming struvite crystals (MgNH
4pO
4.6H
2and MgHPO O)
4precipitation.
An optimal technical scheme of the present invention, in described step (1), waste water flooding time in preaeration tank is 1.0-3 hour, and aeration aerobic time is 2-4 hour, and sedimentation time is 1 hour.
An optimal technical scheme of the present invention, in described step (1), in preaeration tank, flooding time comprises anoxia stirring 1.0 hours, and the stopping of anaerobism stirs 0.5 hour, and aeration aerobic time is 3 hours, and sedimentation time is 1 hour.
An optimal technical scheme of the present invention, the gas-water ratio of preaeration is at 1:20 ~ 1:40.
An optimal technical scheme of the present invention, establishes mud discharging device bottom preaeration tank, the regular mixing body refuse getting rid of a part of mud and struvite for 3 ~ 5 days.
An optimal technical scheme of the present invention, described polyP bacteria is selected from Cray platinum Bordetella, false unicellular Pseudomonas, Staphylococcus or Corynebacterium.
The invention has the beneficial effects as follows: the present invention is in conjunction with the advantage of chemical dephosphorization and biological phosphate-eliminating, and chemistry and biological phosphate-eliminating act synergistically.By discharging the body refuse that in preaeration tank, high phosphorus containing sludge is formed with the phosphorous throw out based on struvite, the total phosphorus in waste water is removed.Method operation of the present invention is simple, total tp removal rate high (about 96.8%); While removal total phosphorus, part (30 ~ 40%) organic pollutant and nitrogen can also be removed, alleviate the burden of follow-up Aerobic biological process and advanced treatment.
The present invention is by the time of adjustment polyP bacteria different operation in preaeration tank, and reach best phosphor-removing effect, reaching 96.8% except P leads, is 82% except N leads.
Suitable treatment COD of the present invention at 1000 ~ 5000mg/L, the TP waste water at 100 ~ 500mg/L, such as alcohol, starch, the water outlet etc. of bean product factory effluent after anaerobically fermenting.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is the fundamental diagram of the inventive method.
1 is air, and 2 is pending containing high phosphorus waste water, and 3 be nitrogenous, magnesium material, and 4 be secondary clarifier effluent or denitrification phegma, and 5 for containing low-phosphorous waste water after process, and 6 is the mixing body refuse containing high phosphorus sludge and struvite, and A is preaeration tank.
Embodiment
For the ease of understanding, below will be described in detail the present invention by specific embodiment.It is important to note that these descriptions are only exemplary descriptions, do not form limitation of the scope of the invention.According to the discussion of this specification sheets, many changes of the present invention, to change concerning one of ordinary skill in the art be all apparent.
Below in conjunction with the inventive method Fig. 1: pendingly enter preaeration tank A containing high phosphorus waste water 1, in A, suspended solids content MLSS is 3000 ~ 4000mg/L, waste water flooding time in preaeration tank comprises anoxia stirring 1.0 hours, the stopping of anaerobism stirs 0.5 hour, aeration aerobic time is 3 hours, sedimentation time is 1 hour, gas-water ratio is at 1:20 ~ 1:40, by polyP bacteria excess ingestion phosphorus under aerobic condition, part (about 30 ~ 40%) organic substance decomposing is that carbonic acid gas and water are degraded by oxygenolysis; Measuring the content containing nitrogen, phosphorus, magnesium in high phosphorus waste water, by calculating, in preaeration tank A, adding nitrogenous, the magnesium material 3 of equal proportion, by chemical dephosphorization (crystallization), form struvite crystals (MgNH
4pO
4.6H
2and MgHPO O)
4precipitation.
Quantitatively supplement nitrogenous, magnesium material 3, as ammonium chloride, urea, magnesium chloride, magnesium hydroxide etc., with in secondary clarifier effluent or denitrification phegma 4 to preaeration tank A, chemistry and biological phosphate-eliminating reaction is there is in preaeration tank A, remove the phosphorus in waste water, remove some organic pollutants and nitrogen in waste water simultaneously.After process, low-phosphorous waste water 5 enters the aerobic and advanced treatment in rear end and removes remaining total phosphorus and organic pollutant.Bottom preaeration tank A, regular (3 ~ 5 days) discharge the body refuse 6 that a part contains high phosphorus sludge and struvite, reach the object of dephosphorization.
The reaction generating struvite is relatively more complete, and speed of response is fast.During actual motion, also may occur with side reaction, generate MgHPO
4precipitation.
Because in chemical reaction dephosphorization, phosphoric acid salt constantly consumes, the basicity in preaeration tank constantly declines, and pH value reduces, and therefore constantly must supplement basicity in reaction process, molecular balance is moved right.By adding alkaline matter or back-end processing containing basicity phegma (denitrification phegma or secondary clarifier effluent).
Above-mentioned example, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to spirit of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (1)
1. chemical/biological reaction synergy removes a method for total phosphorus in waste water, it is characterized in that, comprises the following steps:
(1) waste water containing high phosphorus enters in preaeration tank, wherein suspended solids content (MLSS) is 3000 ~ 4000mg/L, and polyP bacteria is excess ingestion phosphorus under aerobic condition, passes through oxygenolysis, partial organic substances be decomposed into carbonic acid gas and water and degrade
Waste water flooding time in preaeration tank is 1.0-3 hour, and aeration aerobic time is 2-4 hour, and sedimentation time is 1 hour,
Flooding time comprises anoxia stirring 1.0 hours, and the stopping of anaerobism stirs 0.5 hour, and aeration aerobic time is 3 hours, and sedimentation time is 1 hour, and described polyP bacteria is selected from Cray platinum Bordetella, false unicellular Pseudomonas, Staphylococcus or Corynebacterium;
The gas-water ratio of preaeration is at 1:20 ~ 1:40;
(2) measure the content containing nitrogen, phosphorus, magnesium in high phosphorus waste water, by calculating, in preaeration tank, adding the ammonium chloride of equal proportion, urea, magnesium chloride, magnesium hydroxide, forming struvite crystals (MgNH
4pO
4.6H
2and MgHPO O)
4precipitation,
Mud discharging device is established, the regular mixing body refuse getting rid of a part of mud and struvite for 3 ~ 5 days bottom preaeration tank.
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| SE539023C2 (en) * | 2014-10-02 | 2017-03-21 | Xylem Ip Man S À R L | A method for treating wastewater |
| CN104556471A (en) * | 2014-12-04 | 2015-04-29 | 常州大学 | Method for restoring phosphatic substances in slow-release water body |
| US10414681B2 (en) * | 2016-05-20 | 2019-09-17 | Cambi Technology As | Method for recovery of phosphate |
| CN107902844B (en) * | 2017-12-07 | 2021-03-02 | 河南工业大学 | Method for preventing and treating struvite of anaerobic effluent in sewage treatment process |
| CN108751572A (en) * | 2018-05-17 | 2018-11-06 | 沈阳建筑大学 | A kind of wastewater treatment equipment and method of intensified denitrification and dephosphorization |
| CN108862943B (en) * | 2018-09-11 | 2023-07-28 | 尚川（北京）水务有限公司 | Adjustable biomembrane-activated sludge sewage treatment method and device |
| CN110950493B (en) * | 2019-12-04 | 2022-08-30 | 金徽酒股份有限公司 | White spirit production wastewater treatment system and method |
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| CN103011493A (en) * | 2012-10-22 | 2013-04-03 | 武汉益生泉生物科技开发有限责任公司 | Method for removing phosphate and nitrogen from hyperphosphate and high ammonia nitrogen sewage and recovering resources |
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| CN103011493A (en) * | 2012-10-22 | 2013-04-03 | 武汉益生泉生物科技开发有限责任公司 | Method for removing phosphate and nitrogen from hyperphosphate and high ammonia nitrogen sewage and recovering resources |
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