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Method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon

A technology of animal manure and mixture, which is applied in the field of ecological protection to achieve the effect of high phosphorus removal efficiency and low cost

Active Publication Date: 2015-11-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many phosphorus removal technologies for urban sewage and chemical production sewage, but there is no better technology that can effectively remove phosphorus in animal manure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon, the specific operation steps are as follows:

[0023] (1) Grind 20g of animal feces finely, sieve through a 5mm sieve, add 1.5 times the amount of water to dilute, stir well, and at a temperature of 10°C, use acetic acid, citric acid and hydrochloric acid with a mass concentration of 37%. Adjust the pH value of the above-mentioned diluted feces to 3.2, shake it in a reciprocating shaker for 1 hour, the shaking frequency is about 130 times / min, and carry out the hydrolysis reaction. Centrifuge for 6 minutes, carry out solid-liquid separation, and obtain the liquid part and the solid part of the hydrolysis reaction, wherein the soluble phosphorus contained in the liquid part is not less than 3.6g / L, and the N:P contained in the solid part is greater than 4, and the solid part The phosphorus contained in the part does not exceed 30% of the total phosphorus of the animal manure; ...

Embodiment 2

[0027] A method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon, the specific operation steps are as follows:

[0028] (1) Grind 20g of animal feces finely, sieve through a 5.3mm sieve, add 2.5 times the amount of water to dilute, stir evenly, and at a temperature of 27°C, use citric acid with a mass concentration of 55% to dilute the above-mentioned Adjust the pH value of the stool to 3.6, shake it in a reciprocating shaker for 1 hour, the shaking frequency is about 130 times / min, and carry out the hydrolysis reaction. Minutes, carry out solid-liquid separation to obtain the liquid part and solid part of the hydrolysis reaction, wherein the soluble phosphorus contained in the liquid part is not less than 3.6g / L, the N:P contained in the solid part is greater than 4, and the solid part contains Phosphorus does not exceed 30% of the total phosphorus of the animal feces; acid can be used to achieve selective hydrolysis of phosphorus, and thi...

Embodiment 3

[0032] A method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon, the specific operation steps are as follows:

[0033] (1) Grind 20g of animal manure finely, sieve through a 5.6mm sieve, add 3.5 times the amount of water to dilute, stir evenly, and at a temperature of 45°C, use acetic acid, citric acid and hydrochloric acid with a mass concentration of 37% Adjust the pH value of the above-mentioned diluted feces to 4.0, shake it in a reciprocating shaker for 1 hour, the shaking frequency is about 130 times / min, and carry out the hydrolysis reaction. / min centrifugal 10 minutes, carry out solid-liquid separation, obtain the liquid part and the solid part of hydrolysis reaction, the soluble phosphorus that wherein said liquid part comprises is not less than 3.6g / L, the N:P that said solid part contains is greater than 4, and The phosphorus contained in the solid part does not exceed 30% of the total phosphorus of the animal manure; the selec...

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PUM

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Abstract

The present invention belongs to the technical field of environmental protection, and in particular relates to a method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon. The method comprises the steps of: sieving animal manure, diluting with water, stirring evenly, adjusting the pH value to 3.2-4.0 by acid, conducting a hydrolysis reaction, allowing to stand, conducting solid-liquid separation, so as to obtain a hydrolysis reaction liquid portion and a solid portion; adjusting the pH value of the liquid portion to 8.0 to 11.0 by alkali, adding a flocculant to precipitate phosphorus, so as to obtain a liquid portion with phosphorus removed and a precipitated solid containing phosphorus; filtering the precipitated solid containing phosphorus, and recovering the liquid portion. The method of the invention has high phosphate removal efficiency and no obvious influence on nitrogen content.

Description

technical field [0001] The invention belongs to the technical field of ecological environment protection, and in particular relates to a method for removing phosphorus from animal manure containing phosphorus, nitrogen and carbon. Background technique [0002] With the growth of population and the development of economy, agricultural waste disposal is a big problem faced by human beings, and the manure produced by animal husbandry exceeds the needs of the amount of manure recycled by agricultural production. Especially in high-concentration animal husbandry production systems, the main problem affecting sustainable development is the imbalance of nitrogen and phosphorus. When animal manure is used as fertilizer, the ratio of the nutrients contained in it to the nutrients required by crops is very different. So when manure is applied based on the nitrogen requirement of the crop, there is an excess of phosphorus, excess phosphorus application leads to phosphorus accumulation ...

Claims

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Application Information

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IPC IPC(8): C05F3/00
CPCY02A40/20
Inventor 牛晓君
Owner SOUTH CHINA UNIV OF TECH
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