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

A recovery method and technology for pig farms are applied in the field of nitrogen and phosphorus recovery from biogas slurry in pig farms, which can solve problems such as processing difficulties and achieve the effect of reducing processing costs.

Inactive Publication Date: 2014-01-22
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that it is difficult to treat high-concentration pig farm biogas liquid wastewater by biological methods, and propose a method for recovering nitrogen and phosphorus from pig farm biogas liquid based on the principle of magnesium ammonium phosphate crystallization method

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

Examples

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Embodiment 1

[0019] What this embodiment deals with is 120m 3 Pig farm biogas slurry 1: its The concentration is 42.95mg / L, The concentration is 418.56mg / L. The specific implementation steps are as follows: First, the biogas slurry enters the reaction tank 1, and 1200 kg of papermaking lime mud powder that has been dried, ground and modified is added to make the pH value of the biogas slurry 9.5, and stirred for 15 minutes at a stirring speed of 200 r / min. Add KH to the mud 2 PO 4 3.88kg, MgCl 2 ·6H 2 6.07kg. The mixed solution reacted in the reaction tank 1 flows into the sedimentation tank 2 by gravity, stays in the sedimentation tank 2 for 20-30 minutes, and the supernatant in the sedimentation tank 2 The concentration is 3.74mg / L, The concentration was 35.57mg / L, and the removal rates were 91.29% and 91.50%, respectively. After the settled sludge is concentrated in the sludge thickening tank 3, the concentrated solution is returned to the reaction tank 1, and the concentra...

Embodiment 2

[0021] What this embodiment deals with is 190m 3 Pig farm biogas slurry 2: its The concentration is 85.64mg / L, The concentration is 796.82mg / L. The specific implementation steps are as follows: First, the biogas slurry enters the reaction tank 1, and 1900 kg of dried and ground paper-making lime mud powder is added to make the pH value of the biogas slurry 9.5, and stirred for 15 minutes at a stirring speed of 200 r / min. K H 2 PO 4 7.36kg, MgCl 2 ·6H 2 O11.55kg. The mixed solution reacted in the reaction tank 1 flows into the sedimentation tank 2 by gravity, stays in the sedimentation tank 2 for 20-30 minutes, and the supernatant in the sedimentation tank 2 The concentration is 5.67mg / L, The concentration was 62.35mg / L, and the removal rates were 93.38% and 92.18%, respectively. After the settled sludge is concentrated in the sludge thickening tank 3, the concentrated solution is returned to the reaction tank 1, and the concentrated sludge is dehydrated by the deca...

Embodiment 3

[0023] What this embodiment deals with is 80m 3 Pig farm biogas slurry 3: its The concentration is 53.18mg / L, The concentration is 674.26mg / L. The specific implementation steps are as follows: First, the biogas slurry enters the reaction tank 1, and 800 kg of papermaking lime mud powder that has been dried, ground and modified is added to make the pH of the biogas slurry 9.5, and stirred for 15 minutes at a stirring speed of 200 r / min. Add KH to the mud 2 PO 4 6.32kg, MgCl 2 ·6H 2 O9.78kg. The mixed solution reacted in the reaction tank 1 flows into the sedimentation tank 2 by gravity, stays in the sedimentation tank 2 for 20-30 minutes, and the supernatant in the sedimentation tank 2 The concentration is 3.85mg / L, The concentration was 43.37mg / L, and the removal rates were 92.76% and 93.57%, respectively. After the settled sludge is concentrated in the sludge thickening tank 3, the concentrated solution is returned to the reaction tank 1, and the concentrated slu...

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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 [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for recovering nitrogen and phosphorus in pig farm biogas slurry. Background technique [0002] Pig farm manure wastewater is a kind of organic wastewater rich in nitrogen and phosphorus. In recent years, the pig breeding industry has developed rapidly and its scale has continued to expand, and the resulting waste water has become more and more harmful to the environment. Anaerobic digestion in biogas digesters is currently the most popular treatment process for pig farm wastewater in my country. The liquid after anaerobic digestion of pig farm wastewater is biogas slurry. According to the detection and analysis of physical and chemical properties of biogas slurry from large and medium-sized biogas projects in Jiangsu Province by Jin Hongmei and others in Journal of Agricultural Engineering, Volume 27, Phase 1, 2011, the total nitrogen content of bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C05G1/00
Inventor 张文艺韩有法刘春节郑泽鑫李仁霞
Owner CHANGZHOU UNIV
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