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Method for recovering phosphorus by hydrothermally carbonizing livestock manure

A technology for hydrothermal carbonization and livestock and poultry manure, which is applied in the field of environmental engineering, can solve the problem of not paying much attention to the hydrothermal carbonization of livestock and poultry manure, achieve high practical value and economic benefits, and meet the effect of reduction.

Active Publication Date: 2019-05-07
CHONGQING UNIV
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AI Technical Summary

Problems solved by technology

[0004] Most of the current hydrothermal carbonization patents focus on the research of raw materials such as municipal sludge and kitchen waste, but not much attention is paid to the hydrothermal carbonization treatment of livestock and poultry manure

Method used

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Examples

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Effect test

Embodiment 1

[0025] Step (1): Take 65g (dry weight) of chicken manure from a chicken farm, wherein the phosphorus content is 1.122g, and the solid-to-liquid ratio is 1:5 to make raw materials with a moisture content of about 83.3%; The hydrothermal carbonization was carried out under the reaction conditions of 1 hour.

[0026] Step (2): Filtrate the carbonized product of step (1) for solid-liquid separation to obtain 42.9 g of biochar and 1.108 g of phosphorus, that is, 98.8% of the phosphorus in chicken manure is converted into biochar.

[0027] Step (3): adding 0.8 mol / L sulfuric acid to the biochar filtered in step (2), adjusting the pH value to 2.0, and obtaining the extracted biochar and filtrate by filtering, washing and drying.

[0028] Step (4): With the filtrate in step (3), add MgCl 2 solution and NH 4 Cl solution, Mg in the solution: P molar ratio is 1.3:1, N:P molar ratio is 2:1, adjusts pH value to be 9.0, forms struvite crystallization and gives recovery, phosphorus content...

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Abstract

The invention discloses a method for recovering phosphorus by hydrothermally carbonizing livestock manure. The method comprises the following steps: (1) taking and hydrothermally carbonizing livestockmanure to obtain carbonized product; (2) performing solid-liquid separation on the carbonized product to respectively obtain biochar and a liquid phase product; (3) extracting phosphorus from biocharby an acid leaching process, and performing filtration to obtain a filtrate; and (4) adding a magnesium salt and an ammonium salt to the filtrate, adjusting the pH value to form struvite crystals, and recovering the crystals. The livestock manure is hydrothermally carbonized to degrade pathogens and organic pollutants, and a large amount of phosphorus is recovered from the biochar product as a raw material of a phosphate fertilizer, so the method meets the requirements of reduction, harmlessness and recycling, and has great practical values and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for recovering phosphorus by hydrothermal carbonization of livestock and poultry manure. Background technique [0002] With the development of my country's livestock and poultry breeding industry, the annual production of livestock and poultry manure in my country is about 3.8 billion tons, but only half of the livestock and poultry manure is comprehensively utilized. Livestock manure has seriously polluted the soil, air and water environment. Livestock manure contains large amounts of phosphorus, which is essential for crop growth. The phosphorus contained in livestock and poultry manure reaches 7 million tons every year, which is equivalent to about 40% of the total amount exploited by human beings. Land application of manure is a traditional method of fertilization, both as a waste disposal option and as a means of recycling nutrients. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00B01J20/20C01B25/45
Inventor 许劲方俊华范准吕秋颖唐琦李杨
Owner CHONGQING UNIV
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