CN102898213A - Method for recovering nitrogen and phosphorus from biogas slurry from pig farms - Google Patents
Method for recovering nitrogen and phosphorus from biogas slurry from pig farms Download PDFInfo
- Publication number
- CN102898213A CN102898213A CN 201210385835 CN201210385835A CN102898213A CN 102898213 A CN102898213 A CN 102898213A CN 201210385835 CN201210385835 CN 201210385835 CN 201210385835 A CN201210385835 A CN 201210385835A CN 102898213 A CN102898213 A CN 102898213A
- Authority
- CN
- China
- Prior art keywords
- natural pond
- liquid
- phosphorus
- sludge
- paper white
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Fertilizers (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a method for recovering nitrogen and phosphorus from biogas slurry from pig farms. The method comprises the following steps of: adding a certain amount of magnesium ammonium phosphate crystal into papermaking white clay to modify the papermaking white clay; adding the modified papermaking white clay into biogas slurry in which neutralization and chemical precipitation reaction are carried out; and thus, removing the nitrogen and phosphorus from the biogas slurry in form of precipitate. The method can reduce treatment cost. The precipitate contains rich organic matters and nutrients needed by plants for growth such as nitrogen and phosphorus, and can be used to make organic compound fertilizers for promoting the growth of the plants. The method changes waste into valuable materials.
Description
Technical field
The invention belongs to water-treatment technology field, be specifically related to nitrogen phosphorus recovery method in the liquid of natural pond, a kind of pig farm.
Background technology
The pig farm excrement and urine water is a kind of organic waste water of rich Nitrogen-and Phosphorus-containing.In recent years, pig-breeding already develops rapidly, and scale constantly enlarges, and the excrement and urine water that thereupon produces is also more and more serious to the harm that environment causes.The methane-generating pit anaerobic digestion is that present China processes a kind for the treatment of process that the Wastewater from Pig Farm application is popularized the most.The liquid of Wastewater from Pig Farm after anaerobic digestion is natural pond liquid.According to " Transactions of the Chinese Society of Agricultural Engineering " the 1st phase of the 27th volume in 2011 the 294th page of people such as Jin Hong plum big-and-middle-sized biogas engineering natural pond, Jiangsu Province liquid physicochemical property is detected analysis, the total nitrogen content of natural pond, pig farm liquid is average 887.2 mg/L of 209.8～1732.3mg/L(), total phosphorous is the average 140.7mg/L of 22.7～404.7mg/L(), as seen natural pond liquid nitrogen, phosphorus content are still higher, if do not deal carefully with, will certainly cause secondary pollution to environment.
At present, from waste water, remove simultaneously nitrogen phosphorus, mainly adopt A
2The biological process such as/O or oxidation ditch, these methods make nitrogen in the waste water with N by anaerobic denitrifying bacterium/aerobic nitrification bacterium
2Form remove, then remove in discharging excess sludge mode by polyP bacteria for phosphorus.The excess sludge overwhelming majority who contains nitrogen phosphorus that biological process produces carries out ultimate disposal in the mode of sanitary landfill, and the nitrogen phosphorus in the mud is underutilized.In addition, biological process is only applicable to the processing of middle NITROGEN IN LOW CONCENTRATION phosphorus waste water, for the nitrogen phosphorus waste water of high density, needs just can carry out a biological disposal upon after the dilution, has increased processing cost, has limited its application in the high concentration N-P wastewater treatment.For high concentration N-P waste water, the ideal technology of realizing that nitrogen phosphorus reclaims synchronously is the ammoniomagnesium phosphate crystal method.The ammoniomagnesium phosphate crystal method need to add magnesium elements and add a large amount of alkali nitrogen and phosphorus removal, regulates the potential of hydrogen of waste water as adopting chemical agent, and cost is higher, is difficult to realize the commercialization processing, has restricted its widespread use of removing in waste water nitrogen phosphorus.
Paper white sludge is a kind of strong basicity waste that produces in the alkali recovery process of paper mill, and the 769th page of " agro-environment science journal " the 4th phase of the 30th volume in 2011 reported and contained 2.75% and 51% in the paper white sludge.According to the nitrogen phosphorus in the liquid of ammoniomagnesium phosphate crystal method principle removal natural pond, pig farm, add the modification paper white sludge and regulate the potential of hydrogen of waste water, then can make in the waste water and under alkaline condition with the modification paper white sludge in chemical reaction occurs, form the throw outs such as calcium phosphate powder () and magnesium ammonium phosphate (), thereby realize that nitrogen phosphorus is removed synchronously in the waste water.So not only can accomplish " treatment of wastes with processes of wastes against one another ", and reduce processing costs, the throw out of generation is rich in nitrogen, phosphorus, can make agricultural and use organic slow-release fertilizer, thereby the present invention has wide future in engineering applications.
Summary of the invention
The objective of the invention is to adopt this difficult problem of biological process difficult treatment, natural pond, a kind of pig farm liquid nitrogen phosphorus recovery method that proposes according to ammoniomagnesium phosphate crystal method principle for natural pond, high density pig farm liquid waste water.
Cardinal principle of the present invention is as follows:
The present invention removes natural pond, pig farm liquid nitrogen phosphorus according to ammoniomagnesium phosphate crystal method principle, utilize in the modification paper white sludge, and, make natural pond liquid neutralization with and the chemical precipitation reaction occurs, thereby make the nitrogen phosphorus in the liquid of natural pond be precipitated removal.The main chemical reactions equation is as follows:
Nitrogen phosphorus recovery method in the liquid of natural pond, pig farm of the present invention, be with a certain amount of with join in the paper white sludge, paper white sludge is carried out modification, paper white sludge after the modification adds in the liquid of natural pond, natural pond liquid neutralizes and reacts with the generation chemical precipitation, thereby makes the nitrogen phosphorus in the liquid of natural pond be precipitated removal.
In the paper white sludge with add-on and natural pond, pig farm liquid in relevant with concentration.After adding the modification paper white sludge in the liquid of natural pond so that in the liquid of natural pond,, mol ratio is n (): n (): n ()=1:1:1.
The white clay method of modifying is: be under 110 ℃ of conditions behind the oven dry 5h with paper white sludge in temperature, grind, cross 100 mesh sieves, then add with and mix and get final product.
The present invention not only can reduce processing cost, and the throw out of generation is rich in organic and the plant-growth essential nutrient elements such as nitrogen, phosphorus, can make the organic composite fertilizer that promotes crop growth, has really accomplished " turning waste into wealth ".
Description of drawings
Fig. 1 is process flow diagram of the present invention.Among the figure: 1-reaction tank; 2-settling tank; 3-sludge thickener; 4-sleeping spiral shell discharging sedimentation centrifuge.
Embodiment
The present invention with a certain amount of with join in the paper white sludge, paper white sludge is carried out modification, paper white sludge after the modification adds in the liquid of natural pond, the neutralization of natural pond liquid with and the chemical precipitation reaction occurs, thereby make the nitrogen phosphorus in the liquid of natural pond be precipitated removal.Precipitating sludge is rich in nitrogen, phosphorus composition, and after sludge thickener was concentrated, thickened sludge was mud cake through sleeping spiral shell discharging sedimentation centrifuge dehydration, and concentrated solution and centrifugate are back to reaction tank.Its concrete treatment process is as follows:
As shown in Figure 1, at first natural pond, pig farm liquid enters reaction tank 1, adds the paper white sludge powder of a certain amount of drying, milled processed and modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min.In the paper white sludge with add-on and natural pond, pig farm liquid in relevant with concentration so that add behind the modification paper white sludge in the liquid of natural pond,, mol ratio is n (): n (): n ()=1:1:1.Be 1m for volume
3, concentration is that 42.95～85.64mg/L, concentration are the natural pond liquid of 418.56～796.82mg/L, its concrete add-on is: 3.88～7.36kg, 6.07～11.55kg.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, in the settling tank 2 supernatant liquor concentration less than 65.57mg/L, clearance reaches respectively 86.29% less than 5.89mg/L, concentration, more than 84.33%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
5 embodiment of the present invention below are provided.
Embodiment 1
That the present embodiment is processed is 120m
3Natural pond, pig farm liquid 1: its concentration is that 42.95mg/L, concentration are 418.56mg/L.The implementation step is as follows: at first natural pond liquid enters reaction tank 1, add the paper white sludge powder 1200kg of drying, milled processed and modification, the pH value that makes natural pond liquid is 9.5, stirs 15min, stirring velocity is 200r/min, adds 3.88kg, 6.07kg in the paper white sludge.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, and supernatant liquor concentration is that 3.74mg/L, concentration are 35.57mg/L in the settling tank 2, and clearance is respectively 91.29%, 91.50%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
Embodiment 2
That the present embodiment is processed is 190m
3Natural pond, pig farm liquid 2: its concentration is that 85.64mg/L, concentration are 796.82mg/L.The implementation step is as follows: at first natural pond liquid enters reaction tank 1, adds the paper white sludge powder 1900kg of drying, milled processed, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min, adds 7.36kg, 11.55kg in the paper white sludge.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, and supernatant liquor concentration is that 5.67mg/L, concentration are 62.35mg/L in the settling tank 2, and clearance is respectively 93.38%, 92.18%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
Embodiment 3
That the present embodiment is processed is 80m
3Natural pond, pig farm liquid 3: its concentration is that 53.18mg/L, concentration are 674.26mg/L.The implementation step is as follows: at first natural pond liquid enters reaction tank 1, add the paper white sludge powder 800kg of drying, milled processed and modification, the pH value that makes natural pond liquid is 9.5, stirs 15min, stirring velocity is 200r/min, adds 6.32kg, 9.78kg in the paper white sludge.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, and supernatant liquor concentration is that 3.85mg/L, concentration are 43.37mg/L in the settling tank 2, and clearance is respectively 92.76%, 93.57%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
Embodiment 4
That the present embodiment is processed is 220m
3Natural pond, pig farm liquid 4: its lettuce is that 64.31mg/L, concentration are 536.48mg/L.The implementation step is as follows: at first natural pond liquid enters reaction tank 1, add the paper white sludge powder 2200kg of drying, milled processed and modification, the pH value that makes natural pond liquid is 9.5, stirs 15min, stirring velocity is 200r/min, adds 4.93kg, 7.78kg in the paper white sludge.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, and supernatant liquor concentration is that 4.76mg/L, concentration are 52.46mg/L in the settling tank 2, and clearance is respectively 91.05%, 92.22%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
Embodiment 5
That the present embodiment is processed is 260m
3Natural pond, pig farm liquid 5: its lettuce is that 78.63mg/L, concentration are 749.32mg/L.The implementation step is as follows: at first natural pond liquid enters reaction tank 1, add the paper white sludge powder 2600kg of drying, milled processed and modification, the pH value that makes natural pond liquid is 9.5, stirs 15min, stirring velocity is 200r/min, adds 6.93kg, 10.87kg in the paper white sludge.Through reaction tank 1 reacted mixed solution, gravity flow enters settling tank 2, stops 20～30min in settling tank 2, and supernatant liquor concentration is that 5.28mg/L, concentration are 60.61mg/L in the settling tank 2, and clearance is respectively 90.07%, 91.01%.Precipitating sludge is after sludge thickener 3 concentrates, concentrated solution is back to reaction tank 1, thickened sludge is through sleeping spiral shell discharging sedimentation centrifuge 4 dehydrations, sleeping spiral shell discharging sedimentation centrifuge 4 rotating speeds are 1100～1300r/min, centrifugation time 10～15min, centrifugate is back to reaction tank 1, and the moisture content of the cake after the dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in the mud, can makes the organic composite fertilizer that promotes crop growth.
Claims (3)
1. nitrogen phosphorus recovery method in the liquid of natural pond, a pig farm, it is characterized in that: with a certain amount of with join in the paper white sludge, paper white sludge is carried out modification, paper white sludge after the modification adds in the liquid of natural pond, natural pond liquid neutralizes and reacts with the generation chemical precipitation, thereby makes the nitrogen phosphorus in the liquid of natural pond be precipitated removal.
2. nitrogen phosphorus recovery method in the liquid of natural pond, pig farm according to claim 1 is characterized in that, add the modification paper white sludge in the liquid of natural pond after so that in the liquid of natural pond,, mol ratio is n (): n (): n ()=1:1:1.
3. according to nitrogen phosphorus recovery method in the liquid of natural pond, pig farm according to claim 1, it is characterized in that, the white clay method of modifying is: be under 110 ℃ of conditions behind the oven dry 5h with paper white sludge in temperature, grind, cross 100 mesh sieves, then add with and mix and get final product.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210385835 CN102898213A (en) | 2012-10-12 | 2012-10-12 | Method for recovering nitrogen and phosphorus from biogas slurry from pig farms |
| CN201310367207.8A CN103523886A (en) | 2012-10-12 | 2013-08-21 | Method for recycling nitrogen and phosphorus from biogas slurry in pig farms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210385835 CN102898213A (en) | 2012-10-12 | 2012-10-12 | Method for recovering nitrogen and phosphorus from biogas slurry from pig farms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102898213A true CN102898213A (en) | 2013-01-30 |
Family
ID=47570739
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210385835 Pending CN102898213A (en) | 2012-10-12 | 2012-10-12 | Method for recovering nitrogen and phosphorus from biogas slurry from pig farms |
| CN201310367207.8A Pending CN103523886A (en) | 2012-10-12 | 2013-08-21 | Method for recycling nitrogen and phosphorus from biogas slurry in pig farms |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310367207.8A Pending CN103523886A (en) | 2012-10-12 | 2013-08-21 | Method for recycling nitrogen and phosphorus from biogas slurry in pig farms |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN102898213A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523886A (en) * | 2012-10-12 | 2014-01-22 | 常州大学 | Method for recycling nitrogen and phosphorus from biogas slurry in pig farms |
| CN103964588A (en) * | 2014-04-30 | 2014-08-06 | 内蒙古包钢稀土(集团)高科技股份有限公司 | Method for separating calcium ions and magnesium ions from ammonium chloride wastewater |
| CN112321019A (en) * | 2020-10-30 | 2021-02-05 | 南京信息工程大学 | Purification method for reducing phosphorus content in biogas slurry by using calcite |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330000B (en) * | 2015-12-16 | 2017-10-10 | 武汉工程大学 | A kind of processing method of phosphoric acid waste water |
| CN105668739A (en) * | 2016-03-02 | 2016-06-15 | 北京农学院 | Biogas slurry treatment method |
| CN108218571A (en) * | 2018-01-13 | 2018-06-29 | 常州大学 | A kind of distributing pig farm fermentation waste prepares slow-release fertilizer method with zeolite compound |
| CN112158986B (en) * | 2020-09-23 | 2023-04-07 | 广西大学 | Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007244994A (en) * | 2006-03-16 | 2007-09-27 | Unitika Ltd | Treatment method of digestion sludge and treatment equipment |
| CN102898213A (en) * | 2012-10-12 | 2013-01-30 | 常州大学 | Method for recovering nitrogen and phosphorus from biogas slurry from pig farms |
-
2012
- 2012-10-12 CN CN 201210385835 patent/CN102898213A/en active Pending
-
2013
- 2013-08-21 CN CN201310367207.8A patent/CN103523886A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523886A (en) * | 2012-10-12 | 2014-01-22 | 常州大学 | Method for recycling nitrogen and phosphorus from biogas slurry in pig farms |
| CN103964588A (en) * | 2014-04-30 | 2014-08-06 | 内蒙古包钢稀土(集团)高科技股份有限公司 | Method for separating calcium ions and magnesium ions from ammonium chloride wastewater |
| CN103964588B (en) * | 2014-04-30 | 2016-04-06 | 内蒙古包钢稀土(集团)高科技股份有限公司 | A kind of method of calcium and magnesium ion in separating ammonium chloride waste water |
| CN112321019A (en) * | 2020-10-30 | 2021-02-05 | 南京信息工程大学 | Purification method for reducing phosphorus content in biogas slurry by using calcite |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103523886A (en) | 2014-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102898213A (en) | Method for recovering nitrogen and phosphorus from biogas slurry from pig farms | |
| CN108883999B (en) | Recovery of phosphorus compounds from wastewater | |
| Parsons et al. | Phosphorus removal and recovery from municipal wastewaters | |
| JP3452439B2 (en) | Recovery and recycling of useful substances from organic waste | |
| Xu et al. | Alkaline solubilization of excess mixed sludge and the recovery of released phosphorus as magnesium ammonium phosphate | |
| CN102775019B (en) | Coupling type sewage de-phosphorization purification regeneration treatment technique | |
| CN107032580A (en) | A kind of sludge dewatering agent and its application method | |
| CN101654238A (en) | Method for recovering phosphonium compound from phosphorous excess sludge of urban sewage treatment plant | |
| CN101791534B (en) | Phosphorus-removing adsorbent and preparation method thereof | |
| CN103641283A (en) | Method of economically recycling phosphor from excess sludge | |
| CN101695999A (en) | Method for recovering nutritive materials of phosphorus and nitrogen from sewage and sludge | |
| CN104761114A (en) | Enhanced wastewater phosphorus removal method | |
| CN104803546A (en) | Technology for reducing and recycling treatment of sludge of sewage treatment plant | |
| CN102775020B (en) | Coupling type sewage purification and regeneration treating method capable of removing phosphorus efficiently | |
| CN102775021B (en) | Method of advanced treatment of high concentration phosphorus sewage and recycling of phosphorus | |
| Xu et al. | Phosphorus removal and recovery from anaerobic digestion residues | |
| CN101723345A (en) | Method for recovering phosphorus from phosphorus containing sludge | |
| Petzet et al. | Phosphorus recovery from wastewater | |
| CN114195341A (en) | Enhanced pretreatment method for improving anaerobic methanogenesis efficiency of excess sludge and phosphorus availability | |
| Goel et al. | Phosphorous recovery from septic tank liquor: Optimal conditions and effect of tapered velocity gradient | |
| CN109160630A (en) | It is a kind of to precipitate the phosphorus in waste water recovery process for combining alkaline anaerobic fermentation based on chemical strengthening level-one | |
| CN113461284A (en) | Municipal sludge treatment method for nitrate-enhanced pyrohydrolysis | |
| CN206157073U (en) | Device for extracting phosphorus in sludge to produce phosphorus-containing compound fertilizer | |
| CN105502852A (en) | Method for quickly treating refuse leachate of refuse incineration plant | |
| CN111362245B (en) | Method for efficiently recovering nitrogen and phosphorus resources from black water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130130 |