CN103523886A - Method for recycling nitrogen and phosphorus from biogas slurry in pig farms - Google Patents

Method for recycling nitrogen and phosphorus from biogas slurry in pig farms Download PDF

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CN103523886A
CN103523886A CN201310367207.8A CN201310367207A CN103523886A CN 103523886 A CN103523886 A CN 103523886A CN 201310367207 A CN201310367207 A CN 201310367207A CN 103523886 A CN103523886 A CN 103523886A
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natural pond
liquid
sludge
phosphorus
paper white
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张文艺
韩有法
刘春节
郑泽鑫
李仁霞
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Changzhou University
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Changzhou University
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Abstract

The invention relates to a method for recycling nitrogen and phosphorus from biogas slurry in pig farms. The method comprises the following steps: adding a certain amount of KH2PO4 and MgCl2.6H2O to papermaking white mud so as to modify the papermaking white mud, adding the modified papermaking white mud to the biogas slurry, so that NH4<+> and PO4<3-> is subjected to chemical precipitation reaction with Mg<2+> and Ca<2+>, thus precipitating and removing the nitrogen and phosphorus from the biogas slurry. The method has the advantages that the treatment cost can be reduced, generated precipitates are rich in organic matters and necessary nutrient elements such as nitrogen and phosphorus for plant growth, an organic compound fertilizer for promoting the growth of crops can be produced, and the aim of turning waste into wealth is truly realized.

Description

Nitrogen phosphorus recovery method in the liquid of natural pond, a kind of pig farm
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
Pig farm excrement and urine water is a kind of organic waste water of rich Nitrogen-and Phosphorus-containing.In recent years, pig-breeding industry develops rapidly, and scale constantly expands, and the harm that the excrement and urine water thereupon producing causes environment is also more and more serious.Methane-generating pit anaerobic digestion is that current China processes the most universal a kind for the treatment of process of Wastewater from Pig Farm application.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 27th the 1st phase of volume the 294th page of Jin Hong Mei Dengrendui Jiangsu Province big-and-middle-sized biogas engineering natural pond liquid physicochemical property in 2011, detect and analyze, the total nitrogen content of natural pond, pig farm liquid is the average 887.2mg/L of 209.8～1732.3mg/L(), total phosphorous is the average 140.7mg/L of 22.7～404.7mg/L(), visible natural pond liquid the content of nitrogen and phosphorous is still higher, if do not deal carefully with, will certainly cause secondary pollution to environment.
At present, from waste water, remove nitrogen phosphorus simultaneously, mainly adopt A 2the biological process such as/O or oxidation ditch, these methods make nitrogen in waste water with N by anaerobic denitrifying bacterium/aerobic nitrification bacterium 2form remove, for phosphorus, by polyP bacteria, in discharge excess sludge mode, remove.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 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 dilution, has increased processing cost, has limited its application in high concentration N-P wastewater treatment.For high concentration N-P waste water, realizing the synchronous ideal technology reclaiming of nitrogen phosphorus is ammoniomagnesium phosphate crystal method.The removal of ammoniomagnesium phosphate crystal method to nitrogen phosphorus, need to add magnesium elements and add a large amount of alkali, and as adopted chemical agent to regulate the potential of hydrogen of waste water, cost is higher, is difficult to realize commercialization and processes, and has restricted its widespread use of removing in waste water nitrogen phosphorus.
Paper white sludge is a kind of strong basicity waste producing in the alkali recovery process of paper mill, and the 769th page of " agro-environment science journal " the 30th the 4th phase of volume in 2011 reported and in paper white sludge, contained 2.75%MgO and 51%CaO.According to ammoniomagnesium phosphate crystal method principle, remove the nitrogen phosphorus in the liquid of natural pond, pig farm, add the potential of hydrogen that modification paper white sludge regulates waste water, can make in waste water with
Figure BDA0000369932950000012
under alkaline condition with modification paper white sludge in Mg 2+and Ca 2+there is chemical reaction, form calcium phosphate powder (Ca 10pO 4(OH) 2) and magnesium ammonium phosphate (MgNH 4pO 4) etc. throw out, thereby realize nitrogen phosphorus in waste water, synchronously remove.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 object 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 proposing 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, utilizes the Mg in modification paper white sludge 2+, Ca 2+and OH -, make in the liquid of natural pond
Figure BDA0000369932950000013
with
Figure BDA0000369932950000014
with Mg 2+and Ca 2+generation chemical precipitation reaction, thus make the nitrogen phosphorus in the liquid of natural pond be precipitated removal.Main chemical reactions equation is as follows:
Figure BDA0000369932950000015
Figure BDA0000369932950000016
Nitrogen phosphorus recovery method in the liquid of natural pond, pig farm of the present invention is by a certain amount of KH 2pO 4with MgCl 26H 2o joins in paper white sludge, and paper white sludge is carried out to modification, and the paper white sludge after modification adds in the liquid of Ye Zhong， natural pond, natural pond
Figure BDA0000369932950000017
with
Figure BDA0000369932950000018
with Mg 2+and Ca 2+generation chemical precipitation reaction, thus make the nitrogen phosphorus in the liquid of natural pond be precipitated removal.
KH in paper white sludge 2pO 4with MgCl 26H 2in O add-on and natural pond, pig farm liquid
Figure BDA0000369932950000019
with
Figure BDA00003699329500000110
concentration is relevant.In the liquid of natural pond, add after modification paper white sludge, make in the liquid of natural pond
Figure BDA00003699329500000111
Figure BDA00003699329500000112
mg 2+mol ratio is
Figure BDA00003699329500000113
White clay method of modifying is: by paper white sludge, in temperature, be to dry after 5h under 110 ℃ of conditions, grind, cross 100 mesh sieves, then add KH 2pO 4with MgCl 26H 2o also mixes.
The present invention not only can reduce processing cost, and the throw out of generation is rich in the plant-growth essential nutrient elements such as organic and nitrogen, phosphorus, can make the organic composite fertilizer that promotes crop growth, has really accomplished " turning waste into wealth ".
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.In figure: 1-reaction tank; 2-settling tank; 3-sludge thickener; 4-sleeping spiral shell discharging sedimentation centrifuge.
Embodiment
The present invention is by a certain amount of KH 2pO 4with MgCl 26H 2o joins in paper white sludge, and paper white sludge is carried out to modification, and the paper white sludge after modification adds in the liquid of Ye Zhong， natural pond, natural pond
Figure BDA0000369932950000021
with
Figure BDA0000369932950000022
with Mg 2+and Ca 2+generation chemical precipitation reaction, thus 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 is concentrated, thickened sludge is 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, first natural pond, pig farm liquid enters reaction tank 1, adds the paper white sludge powder of a certain amount of drying, milled processed modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min.KH in paper white sludge 2pO 4with MgCl 26H 2in O add-on and natural pond, pig farm liquid
Figure BDA0000369932950000023
with
Figure BDA0000369932950000024
concentration is relevant, makes to add after modification paper white sludge in the liquid of natural pond
Figure BDA0000369932950000025
Figure BDA0000369932950000026
mg 2+mol ratio is
Figure BDA0000369932950000027
for volume, be 1m 3,
Figure BDA0000369932950000028
concentration be 42.95～85.64mg/L,
Figure BDA0000369932950000029
concentration is the natural pond liquid of 418.56～796.82mg/L, and its concrete add-on is: KH 2pO 43.88～7.36kg, MgCl 26H 2o6.07～11.55kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2
Figure BDA00003699329500000210
concentration be less than 5.89mg/L,
Figure BDA00003699329500000211
concentration is less than 65.57mg/L, and clearance reaches respectively 86.29%, more than 84.33%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make the organic composite fertilizer that promotes crop growth.
5 embodiment of the present invention are below provided.
Embodiment 1
That the present embodiment is processed is 120m 3natural pond, pig farm liquid 1: its concentration be 42.95mg/L,
Figure BDA00003699329500000213
concentration is 418.56mg/L.Concrete implementation step is as follows: first natural pond liquid enters reaction tank 1, adds the paper white sludge powder 1200kg of drying, milled processed modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min, adds KH in paper white sludge 2pO 43.88kg, MgCl 26H 26.07kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2 concentration be 3.74mg/L,
Figure BDA00003699329500000215
concentration is 35.57mg/L, and clearance is respectively 91.29%, 91.50%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make 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
Figure BDA00003699329500000216
concentration be 85.64mg/L,
Figure BDA00003699329500000217
concentration is 796.82mg/L.Concrete implementation step is as follows: 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 KH in paper white sludge 2pO 47.36kg, MgCl 26H 2o11.55kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2
Figure BDA00003699329500000218
concentration be 5.67mg/L,
Figure BDA00003699329500000219
concentration is 62.35mg/L, and clearance is respectively 93.38%, 92.18%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make 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
Figure BDA0000369932950000031
concentration be 53.18mg/L,
Figure BDA0000369932950000032
concentration is 674.26mg/L.Concrete implementation step is as follows: first natural pond liquid enters reaction tank 1, adds the paper white sludge powder 800kg of drying, milled processed modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min, adds KH in paper white sludge 2pO 46.32kg, MgCl 26H 2o9.78kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2
Figure BDA0000369932950000033
concentration be 3.85mg/L,
Figure BDA0000369932950000034
concentration is 43.37mg/L, and clearance is respectively 92.76%, 93.57%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make 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 natural pond liquid
Figure BDA0000369932950000035
concentration be 64.31mg/L,
Figure BDA0000369932950000036
concentration is 536.48mg/L.Concrete implementation step is as follows: first natural pond liquid enters reaction tank 1, adds the paper white sludge powder 2200kg of drying, milled processed modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min, adds KH in paper white sludge 2pO 44.93kg, MgCl 26H 2o7.78kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2
Figure BDA0000369932950000037
concentration be 4.76mg/L,
Figure BDA0000369932950000038
concentration is 52.46mg/L, and clearance is respectively 91.05%, 92.22%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make 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 natural pond liquid
Figure BDA0000369932950000039
concentration be 78.63mg/L,
Figure BDA00003699329500000310
concentration is 749.32mg/L.Concrete implementation step is as follows: first natural pond liquid enters reaction tank 1, adds the paper white sludge powder 2600kg of drying, milled processed modification, and the pH value that makes natural pond liquid is 9.5, stirs 15min, and stirring velocity is 200r/min, adds KH in paper white sludge 2pO 46.93kg, MgCl 26H 2o10.87kg.Through the reacted mixed solution of reaction tank 1, gravity flow enters settling tank 2, stops 20～30min, supernatant liquor in settling tank 2 in settling tank 2 concentration be 5.28mg/L,
Figure BDA00003699329500000312
concentration is 60.61mg/L, and clearance is respectively 90.07%, 91.01%.Precipitating sludge is after sludge thickener 3 is concentrated, 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 dehydration is less than 50%, approximately there is 80% nitrogen phosphorus to be deposited in mud, can make the organic composite fertilizer that promotes crop growth.

Claims (3)

1. a nitrogen phosphorus recovery method in the liquid of natural pond, pig farm, is characterized in that: by a certain amount of KH 2pO 4with MgCl 26H 2o joins in paper white sludge, and paper white sludge is carried out to modification, and the paper white sludge after modification adds in the liquid of Ye Zhong， natural pond, natural pond
Figure FDA0000369932940000011
with
Figure FDA0000369932940000012
with Mg 2+and Ca 2+generation chemical precipitation reaction, thus make 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, adds after modification paper white sludge in the liquid of natural pond, make in the liquid of natural pond
Figure FDA0000369932940000014
mg 2+mol ratio is
Figure FDA0000369932940000015
3. according to nitrogen phosphorus recovery method in the liquid of natural pond, pig farm according to claim 1, it is characterized in that, white clay method of modifying is: by paper white sludge, in temperature, be to dry after 5h under 110 ℃ of conditions, grind, cross 100 mesh sieves, then add KH 2pO 4with MgCl 26H 2o also mixes.
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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
CN112158986A (en) * 2020-09-23 2021-01-01 广西大学 Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge

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CN102898213A (en) * 2012-10-12 2013-01-30 常州大学 Method for recovering nitrogen and phosphorus from biogas slurry from pig farms
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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

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN105330000A (en) * 2015-12-16 2016-02-17 武汉工程大学 Treatment method of phosphoric acid wastewater
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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
CN112158986A (en) * 2020-09-23 2021-01-01 广西大学 Method for treating sewage containing high ammonia, nitrogen and phosphorus in livestock and poultry farm by using boric sludge
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

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Application publication date: 20140122