Method for treating sewage with high ammonia, nitrogen and phosphorus contents in livestock and poultry farms by chemical precipitation

A chemical precipitation method and farm technology, applied in chemical instruments and methods, inorganic chemistry, animal husbandry wastewater treatment, etc., can solve the problem of not removing ammonia and nitrogen at the same time, and achieve low cost, simple operation and fast reaction speed. Effect

Active Publication Date: 2012-09-26
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most chemicals in industrial production can only remove ammonia, nitrogen or phosphorus in wastewater, and there is no method to remove ammonia, nitrogen, and phosphorus at the same time

Method used

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  • Method for treating sewage with high ammonia, nitrogen and phosphorus contents in livestock and poultry farms by chemical precipitation
  • Method for treating sewage with high ammonia, nitrogen and phosphorus contents in livestock and poultry farms by chemical precipitation
  • Method for treating sewage with high ammonia, nitrogen and phosphorus contents in livestock and poultry farms by chemical precipitation

Examples

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Effect test

Embodiment 1

[0029] The PH value of sewage discharged from a pig farm in eastern Guizhou is 6.3~6.5; the sewage contains pig manure, a small amount of feed residue, green feed residue and sewage from flushing pig farms. 3 / h. After the first-stage solid-liquid separation, the sewage enters the sedimentation tank, stands still for 60 minutes, and then is pumped into the fixed bed reaction tower. There are three layers of fixed beds in the tower, and the distance between the beds is 1m; the reactants placed on the bed Medium, calcium magnesium phosphate fertilizer, CaO and Mg(OH) 2 Accounting for 96%, 2% and 2% of the total mass respectively, the thickness of each bed of reactants is controlled at 20cm thick, and the flow rate of sewage in the tower is controlled at 0.5m / s; after passing through the two-stage reaction tower, struvite is precipitated and separated. The mass ratio of phosphorus removal rate is 84.5%, and the mass ratio of ammonia and nitrogen removal rate reaches 71.5%.

Embodiment 2

[0031] In a large cattle farm in eastern Yunnan, the PH value of the discharged sewage is 6.4~6.6. The sewage contains cow dung, feed residues, hay feed residues, and sewage for flushing cattle pens. The mass ratio of solids is 40~45%. The flow rate of sewage is 25 meters 3 / h. After the solid-liquid separation, the sewage enters the sedimentation tank, stands still for 60 minutes, and then is sent to the two-stage fixed bed reaction tower successively through the pump. There are three fixed beds in the tower, and the distance between the beds is 0.8m. The calcium, magnesium, and phosphate fertilizers in the bed reactants , CaO and Mg(OH) 2 Accounting for 98%, 1% and 1% of the total mass respectively, the thickness of each bed layer is controlled at 15cm, and the flow rate of sewage in the tower is controlled at 0.3m / s. Precipitation separates the struvite. The mass ratio of phosphorus removal rate is 86%, and the mass ratio of ammonia and nitrogen removal rate is 73%.

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Abstract

The invention discloses a method for treating sewage with high ammonia, nitrogen and phosphorus contents in livestock and poultry farms by chemical precipitation. The method comprises the following steps of: performing solid-liquid separation on the sewage by using a solid-liquid separator, wherein liquid is discharged into a sedimentation tank for further separation; pumping the sewage which is obtained after separation and deposition into a fixed bed reaction tower in which calcium, magnesium and phosphate fertilizers serve as main reactants, wherein substances which contain the ammonia, the nitrogen or the phosphorus are removed from the sewage in the reaction tower simultaneously; importing sediment and the sewage into a crystallizing pond, and crystallizing to generate struvite; separating the struvite by using the solid-liquid separator; and performing a sewage anaerobic fermentation process on the liquid for further treatment. According to the method, the removal rate of the phosphorous can reach 80 to 90 percent, the removal rate of the ammonia and the nitrogen can reach 70 to 80 percent, and the discharged water can meet the requirement of anaerobic fermentation. The method is high in reaction speed, not influenced by temperatures and low in cost, raw materials are readily available, and the generated sediment, namely the struvite is an efficient sustained-release fertilizer.

Description

technical field [0001] The invention relates to a method for treating high-ammonia, nitrogen and phosphorus sewage in livestock and poultry farms by means of a chemical precipitation method. Background technique [0002] Excessive discharge of ammonia, nitrogen, and phosphorus elements into natural water bodies will lead to eutrophication of the water body, causing the water body to become black and smelly, reducing the ornamental value of the water body, reducing the self-purification ability of the water body, and causing various algae to grow explosively, reducing water pollution. Oxygen content threatens the growth and survival of other aquatic organisms; at the same time, ammonia and nitrogen are easily oxidized to form nitrate and nitrite, which affect the health of aquatic organisms and even human beings, so their discharge is strictly controlled. In addition, the high content of ammonia, nitrogen and phosphorus in the sewage of livestock and poultry farms will inhibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/45C02F103/20
Inventor 黄福川卢朝霞李宏君莫宇飞梁景粟满荣唐兴中田宗义李胜肖友程蓝明新卢誉远林应强曹传东
Owner GUANGXI UNIV
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