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Method for treating livestock and poultry manure through efficient phosphate recovery coupled anaerobic fermentation

An anaerobic fermentation and livestock and poultry manure technology, applied in the field of breeding waste treatment, can solve the problems of low orthophosphate recovery efficiency, low efficiency, low methane conversion efficiency, etc., and achieve optimal coupling, high efficiency, and recovery efficiency. high effect

Active Publication Date: 2017-09-08
BIOGAS SCI RES INST MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the anaerobic fermentation process can also extract a large amount of nutrient salts from livestock and poultry manure into the biogas slurry. A large amount of phosphorus in the biogas slurry can still be recovered by treating the biogas slurry, but the phosphorus is converted into soluble positive substances that are easy to recover. Phosphate is less efficient and most of the phosphorus is in the form of insoluble orthophosphate
[0004] Regarding the anaerobic fermentation of livestock and poultry manure and the recovery and treatment of phosphorus, at present, only the research on a single process is carried out, either to recover phosphorus from livestock and poultry manure, or to produce methane through anaerobic fermentation of livestock and poultry manure, and then Phosphorus in the biogas slurry is recovered, but the recovery efficiency of orthophosphate is not high, the conversion efficiency of methane is not high, and the gas production needs to be further improved in the treatment method of a single process

Method used

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  • Method for treating livestock and poultry manure through efficient phosphate recovery coupled anaerobic fermentation
  • Method for treating livestock and poultry manure through efficient phosphate recovery coupled anaerobic fermentation
  • Method for treating livestock and poultry manure through efficient phosphate recovery coupled anaerobic fermentation

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for efficiently treating cow dung, comprising the steps of:

[0028] (1) hydrothermal pretreatment: take by weighing 25g dry cow dung, phosphorus content is 0.55% in the dry cow dung, to wherein adding hydrochloric acid and water carry out hydrothermal pretreatment, the total mass concentration of hydrochloric acid in the hydrothermal pretreatment mixed system is 0.1%, the total solid content of dry cow dung is 5%, the mixed system is subjected to hydrothermal pretreatment at 200°C for 0.5h, and then solid-liquid separation is carried out, and solid phase product I and liquid phase product I are collected;

[0029] (2) Phosphorus recovery treatment: add NaOH to the liquid phase product I to adjust the pH to 10, stir at 150rpm for 20 minutes, then let it stand for 30 minutes, and then separate the solid phase product II and the liquid phase product II by centrifugation. , the solid phase product II was collected, and after detection, the solid phase product II w...

Embodiment 2

[0032] A method for efficiently processing pig manure, comprising the following steps:

[0033] (1) hydrothermal pretreatment: take by weighing 50g dry pig manure, phosphorus content is 0.65% in the dry pig manure, to wherein adding nitric acid and water carry out hydrothermal pretreatment, the total mass concentration of nitric acid in the hydrothermal pretreatment mixed system is 1%, the solid content of pig manure is 20%, when the mixture is heated until the temperature reaches 380°C, the hydrothermal pretreatment reaction is stopped, and then the solid-liquid separation is carried out, and the solid phase product I and the liquid phase product I are collected;

[0034] (2) Phosphorus recovery treatment: add Mg(OH) to the liquid phase product Ⅰ 2 and MgO to adjust the pH to 9, stir at 100rpm for 30min, then let it stand for 1min, and then centrifuge to separate solid-phase product II and liquid-phase product II, and collect the solid-phase product II. After testing, the sol...

Embodiment 3

[0037] A method for efficiently treating chicken manure, comprising the following steps:

[0038] (1) hydrothermal pretreatment: take by weighing 100g dry chicken manure, phosphorus content is 0.58% in the dry chicken manure, to wherein adding hydrochloric acid and water carry out hydrothermal pretreatment, the total mass concentration of hydrochloric acid in the hydrothermal pretreatment mixed system is 5%, the solid content of chicken manure is 40%, the mixed system is subjected to hydrothermal pretreatment at 100°C for 6 hours, and then solid-liquid separation is carried out, and solid phase product I and liquid phase product I are collected;

[0039] (2) Phosphorus recovery treatment: add Ca(OH) to the liquid phase product Ⅰ 2 or CaO to adjust the pH to 11, stir at 300rpm for 5 minutes, and then let it stand for 20 minutes, then filter and separate the solid and liquid to obtain the solid-phase product II and liquid-phase product II, and collect the solid-phase product II ...

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Abstract

The invention provides a method for treating livestock and poultry manure through efficient phosphate recovery coupled anaerobic fermentation, belonging to the technical field of treatment of cultivation waste. The method comprises the following steps: (1) carrying out hydrothermal pretreatment on the livestock and poultry manure; (2) carrying out phosphate recovery on the pretreated livestock and poultry manure; and (3) carrying out anaerobic fermentation on the pretreated and nutrient salt-recovered livestock and poultry manure. The method provided by the invention is a nutrient salt recovery and anaerobic fermentation coupled process for the livestock and poultry manure based on hydrothermal pretreatment, the extraction and recovery of phosphate in the livestock and poultry manure are well accelerated, the anaerobic fermentation performance of the livestock and poultry manure is improved, and the maximum resource transformation and utilization of the livestock and poultry manure are realized.

Description

technical field [0001] The invention belongs to the technical field of breeding waste treatment, and in particular relates to a method for high-efficiency phosphorus recovery coupled with anaerobic fermentation for treating livestock and poultry manure. Background technique [0002] The rapid development of large-scale breeding industry has brought a large amount of livestock and poultry manure. At present, the total amount of cow manure, pig manure and chicken manure in the world is as high as 1.79 billion tons per year. Anaerobic fermentation is an important way of disposal and utilization. Not only Biogas can be produced, and biogas residue can also be used as fertilizer. However, the existing method of anaerobic fermentation to treat livestock and poultry manure, on the one hand, the conversion rate of methane is not high, on the other hand, because the ratio of nitrogen and phosphorus in livestock and poultry manure is very high, a large amount of nitrogen and phosphoru...

Claims

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Application Information

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IPC IPC(8): C01B25/26C02F11/04C02F103/20
CPCC01B25/26C02F11/04C02F2103/20Y02E50/30
Inventor 代立春谭芙蓉王彦伟吴波祝其丽陈城汉何明雄
Owner BIOGAS SCI RES INST MIN OF AGRI
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