CN100564293C - Strengthen the method for removing phosphorus in the anaerobically digested sludge liquid phase - Google Patents
Strengthen the method for removing phosphorus in the anaerobically digested sludge liquid phase Download PDFInfo
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- CN100564293C CN100564293C CNB2008100503927A CN200810050392A CN100564293C CN 100564293 C CN100564293 C CN 100564293C CN B2008100503927 A CNB2008100503927 A CN B2008100503927A CN 200810050392 A CN200810050392 A CN 200810050392A CN 100564293 C CN100564293 C CN 100564293C
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- phosphorus
- digested sludge
- liquid phase
- anaerobically digested
- calcium
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Abstract
The invention belongs to the sewage sludge processing technology field in the environment protection, be specifically related to a kind of method of removing phosphorus in the anaerobically digested sludge liquid phase of strengthening.The present invention mixes the modified calcium-base wilkinite in proportion with unslaked lime, makes the reinforced phosphor-removing medicament.In pending anaerobically digested sludge, add a certain amount of reinforced phosphor-removing medicament, evenly stirring and post precipitation carry out mud-water separation, reach and strengthen the purpose of removing phosphorus in the liquid phase, make and to be back to that the supernatant liquor phosphorus content descends significantly in the sewage treatment process, and then reduced the phosphorus load of sewage work, after getting rid of mud after the supernatant liquor and carrying out processed such as centrifugation, can be used as recyclings such as soil improvement agent.
Description
Technical field
The invention belongs to the sewage sludge processing technology field in the environment protection, be specifically related to a kind of method of removing phosphorus in the anaerobically digested sludge liquid phase of strengthening.
Background technology
Though anaerobic digestion can be finished sludge stabilization, make that owing to the organic substance in the mud is dissolved the content of phosphorus is very high in the liquid phase.After the residual active sludge of activated sludge process carried out anaerobic digestion, the concentration of total phosphorus was 300～1000mg/L in the mud supernatant liquor, and common treatment process all is to pass back to go in the sewage treatment process to handle again.Supernatant liquor is back in the sewage disposal flow process goes, will increase the internal recycle load of phosphorus, increased working cost to a great extent.Therefore, if can realize the removal of phosphorus simultaneously, will reduce the energy consumption of sewage disposal in the sludge treatment unit.
Traditional chemical phosphorus removal method has the coagulating agent precipitator method, modified clay absorption method, crystallization etc.Above-mentioned the whole bag of tricks or react by metallic cation and phosphate radical and to generate precipitation and remove perhaps reacts and generates new compound and separate removal by adding certain particular matter, perhaps leans on simple physics adsorption dephosphorization, and its action principle is all too single.Thereby, cause its processing to be subjected to the restriction of various external conditions, do not reach the ideal processing efficiency.
Wilkinite is widely used in every field such as metallurgy, machinery, oil, chemical industry and environmental protection mainly as binding agent, water-retaining agent, sorbent material, catalyzer, flocculation agent etc. at present.In order to improve its added value, to use and go to toward carrying out modification to natural montmorillonite, the purpose of modification and effect will directly have influence on practical application effect.
At the problems referred to above, the present invention is parent with the calcium-base bentonite, has prepared modified clay, and the clay after the modification is mixed by a certain percentage with unslaked lime, and as the confection of removing phosphorus in the digested sludge liquid phase, this medicament can greatly improve dephosphorization efficiency by using.
Summary of the invention
The objective of the invention is promptly to reduce the content of phosphorus in the anaerobically digested sludge post precipitation supernatant liquor, alleviate the burden of sewage treatment process phosphorus, overcome the deficiency of existing method simultaneously in order to reduce the concentration of phosphorus in the anaerobically digested sludge liquid phase.
To achieve these goals, the present invention takes following technical scheme:
1, preparation modified alta-mud
A certain amount of calcium-base bentonite is immersed in the vitriol oil that concentration is 2～10mol/L, the volume assurance wilkinite of the vitriol oil is not invaded fully and is not got final product, the immersion treatment time is 6～24 hours, the calcium-base bentonite that immersion treatment is crossed was calcined 1～5 hour down at 200～500 ℃ then, grind the cooling back is 20 orders～100 purpose fine particles, makes modified alta-mud.
2, preparation reinforced phosphor-removing medicament
Is that 2～10: 1 ratio is mixed with above-mentioned modified alta-mud and unslaked lime according to mass ratio, makes the reinforced phosphor-removing medicament.
3, reinforced phosphor-removing
In pending anaerobically digested sludge, add a certain amount of reinforced phosphor-removing medicament, evenly stirred 0.5～2 hour, precipitate 0.5～2 hour then, post precipitation carries out mud-water separation, supernatant liquor is drained in the sewage treatment plant inflow and further handles in sewage treatment process, after getting rid of mud after the supernatant liquor and carrying out processed such as centrifugation, can be used as soil improvement agent etc. and carry out recycling.The dosage of reinforced phosphor-removing medicament is specifically determined according to sludge qualities such as the water ratio of pending digested sludge, phosphorus concentration and practical situation.
Positively effect of the present invention is:
1, abundant and cheap calcium-base bentonite is realized clay alteration as parent through vitriol oil pre-treatment and calcining back with output.After vitriol oil pre-treatment, positively charged ions such as the calcium that exists with compound form in the wilkinite, magnesium, iron, aluminium fully discharge, thereby make clay be formed with the skeleton of many similar molecular sieves than macroscopic void; After the calcium-base bentonite high-temperature calcination that the vitriol oil soaks, further remove volatility organic matter in the clay etc.The collaborative specific surface area that has strengthened clay of the vitriol oil and calcination processing has been given full play to the absorption removal effect of modified clay to phosphorus.
2,, can flocculate with the positively charged ions such as calcium, magnesium, iron, aluminium that discharge in the modified alta-mud, chemical action such as precipitation owing to have nutritive elements such as a large amount of nitrogen, phosphorus in the anaerobically digested sludge liquid phase; With the assistant medicament of unslaked lime as dephosphorization, unite use with pretreated clays, can form the oxyhydroxide flocculation sediment, strengthened the physical adsorption phosphor-removing effect; Simultaneously, lime water separates heat release and the oxyhydroxide flocculation sediment also can improve sludge settling property, helps mud-water separation.
3, synergy such as adsorption and dephosphorization and chemical dephosphorization makes that total tp removal rate improves 30%～50% in the anaerobically digested sludge liquid phase.Simultaneously, the dewatering of anaerobically digested sludge improves, and the water ratio of mud on average reduces about 5%～10%.
Embodiment
100 gram calcium-base bentonites are put in the acid-resistant container, the vitriol oil that adds 5mol/L, the amount assurance wilkinite of the vitriol oil is not invaded fully and is not got final product 12 hours immersion treatment time, calcined 2 hours down at 300 ℃ then, the cooling back is ground and is 60 orders of homogeneous～80 order fine particles.Above-mentioned modified calcium-base wilkinite and the unslaked lime mass ratio according to 5: 1 is mixed, make the reinforced phosphor-removing medicament.
Add the ratio that adds of 1 gram reinforced phosphor-removing medicament according to every liter of digested sludge, the reinforced phosphor-removing medicament of method for preparing is added in the anaerobically digested sludge mixed solution, evenly stirred then 0.5 hour, stirred the back quiescent setting 1 hour, post precipitation carries out mud-water separation, supernatant liquor is drained in the sewage treatment plant inflow and further handles in sewage treatment process, after getting rid of mud after the supernatant liquor and carrying out processed such as centrifugation, can be used as soil improvement agent etc. and carry out recycling, realize the minimizing and the resource utilization of sludge treatment, avoid secondary pollution simultaneously.
Claims (1)
1, a kind of method of removing phosphorus in the anaerobically digested sludge liquid phase of strengthening, it is characterized in that in pending anaerobically digested sludge, adding a certain amount of reinforced phosphor-removing medicament, evenly stirring and post precipitation carry out mud-water separation, described reinforced phosphor-removing medicament is made up of modified calcium-base wilkinite and unslaked lime, mass ratio is 2～10: 1, modified calcium-base preparation method for bentonite in the described reinforced phosphor-removing medicament is: a certain amount of calcium-base bentonite is immersed in the vitriol oil that concentration is 2～10mol/L, the amount of the vitriol oil guarantees that the complete submergence of wilkinite gets final product, the immersion treatment time is 6～24 hours, the calcium-base bentonite that immersion treatment is crossed was calcined 1～5 hour down at 200～500 ℃ then, and grind the cooling back is 20 orders～100 purpose fine particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2008100503927A CN100564293C (en) | 2008-02-25 | 2008-02-25 | Strengthen the method for removing phosphorus in the anaerobically digested sludge liquid phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2008100503927A CN100564293C (en) | 2008-02-25 | 2008-02-25 | Strengthen the method for removing phosphorus in the anaerobically digested sludge liquid phase |
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| CN101234839A CN101234839A (en) | 2008-08-06 |
| CN100564293C true CN100564293C (en) | 2009-12-02 |
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| CNB2008100503927A Expired - Fee Related CN100564293C (en) | 2008-02-25 | 2008-02-25 | Strengthen the method for removing phosphorus in the anaerobically digested sludge liquid phase |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101885571B (en) * | 2010-05-26 | 2012-10-03 | 北京伊普国际水务有限公司 | Processing system and method for recovering phosphorus from excess sludge obtained after municipal sewage treatment |
| CN103224304B (en) * | 2013-05-03 | 2014-07-16 | 南京理工大学 | Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect |
| NL2013253B1 (en) | 2014-07-24 | 2016-09-09 | Cdem B V | Recovery of phosphorous. |
| CN104671434B (en) * | 2015-02-10 | 2016-06-15 | 同济大学 | The method that phosphorus improves suction phosphorus/release phosphorus when biological phosphor-removing effect simultaneously is released based on reducing dephosphorization microbiological anaerobic |
| CN111718076A (en) * | 2020-07-03 | 2020-09-29 | 四川省内江市农业科学院 | Method for treating small water eutrophication in hilly areas |
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2008
- 2008-02-25 CN CNB2008100503927A patent/CN100564293C/en not_active Expired - Fee Related
Non-Patent Citations (8)
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| Phosphate removal using sludge from fuller's earth production. Yong Hee Moon,et al.Journal of Hazardous Materials,Vol.143 . 2007 |
| Phosphate removal using sludge from fuller's earth production. Yong Hee Moon,et al.Journal of Hazardous Materials,Vol.143 . 2007 * |
| 各污泥处理单元废液的磷含量控制问题. 毕学军等.中国给水排水，第19卷第1期. 2003 |
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| 鸟粪石沉淀法在废水除磷脱氮中的应用. 李金页等.中国沼气，第22卷第1期. 2004 |
| 鸟粪石沉淀法在废水除磷脱氮中的应用. 李金页等.中国沼气，第22卷第1期. 2004 * |
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| CN101234839A (en) | 2008-08-06 |
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Application publication date: 20080806 Assignee: Dongbei Design Inst., China Municipal Engineering Assignor: Yin Jun|Zhang Liguo Contract record no.: 2010220000006 Denomination of invention: Method for forcedly removing phosphorus in anaerobic digestion sludge liquid phase Granted publication date: 20091202 License type: Exclusive License Record date: 20100329 |
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Granted publication date: 20091202 Termination date: 20110225 |