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Method of efficiently purifying and comprehensively utilizing biogas slurry

A biogas slurry and high-efficiency technology, applied in the field of waste resource utilization, can solve the problems of high storage and long-distance transportation costs, low farmers' enthusiasm for utilization, and low nutrient element concentration, so as to improve the level of resource utilization and reduce the cost of use. , the effect of large processing capacity

Inactive Publication Date: 2016-10-12
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after biogas fermentation, a large amount of biogas slurry produced will pollute the environment, and the biogas slurry is directly used for fertilization. Because the concentration of various nutrients in the biogas slurry is low, farmers are not very active in using it, and storage and long-distance transportation costs In addition, the biogas slurry in the fermentation tank is directly used to spray the plant liquid surface, the absorption rate is low, and the effect is not obvious. All of the above limit the effective use of the biogas slurry to a certain extent. Therefore, deep processing of the biogas slurry Purification is more important

Method used

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  • Method of efficiently purifying and comprehensively utilizing biogas slurry

Examples

Experimental program
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Effect test

example 1

[0017] The excess biogas slurry from the biogas digester is used as raw material to carry out multi-stage filtration and purification by physical and chemical methods. The specific process is as follows: ①The first step is to extract the excess biogas slurry from the upper layer of the biogas tank and then add a purifying agent to conduct a precipitation; ②The second step is to filter for the first time after the precipitation to filter out the coarse impurities in the biogas slurry; The third step is to perform the second filtration to filter out the fine impurities in the biogas slurry; ④ The fourth step is to heat the filtered biogas slurry at high temperature for the second precipitation; ⑤ The fifth step is to perform the third filtration after precipitation Filter out the precipitated impurities in the biogas slurry; ⑥The sixth step is to perform the fourth filtration to filter out the fine impurities in the biogas slurry; ⑦The seventh step is to store the treated biogas ...

example 2

[0026] The excess biogas slurry from the biogas digester is used as raw material to carry out multi-stage filtration and purification by physical and chemical methods. The specific process is as follows: ①Extract excess biogas slurry from the upper layer of the biogas digester and then add a purifying agent to conduct a precipitation; ②After the precipitation, perform the first filtration to filter out the coarse impurities in the biogas slurry; ③Perform the second filtration to filter out the biogas ④ Heating the filtered biogas slurry at high temperature for the second precipitation; ⑤ After the precipitation, perform the third filtration to filter out the precipitated impurities in the biogas slurry; ⑥ Perform the fourth filtration to filter out the biogas slurry ⑦Store the treated biogas slurry and use it as plant root and foliage fertilizer or plant pest inhibitor.

[0027] When the excess biogas slurry in the upper layer of the biogas digester is pumped into the treatmen...

example 3

[0034] The excess biogas slurry from the biogas digester is used as raw material, and multi-stage filtration and purification are carried out by using a combination of physical and chemical methods. The specific process includes adding a purifying agent to the biogas slurry pumped from the biogas digester, and then undergoing two precipitations, four filtrations, one high-temperature heating, and the purified biogas slurry is cooled and then stored.

[0035] When the excess biogas slurry in the upper layer of the biogas digester is pumped into the treatment system, a filter is installed at the entrance of the biogas slurry of the pumping equipment, and the filter mesh has a pore size of 1.5mm.

[0036] The purification agent added to the biogas slurry is soda ash. The amount of biogas slurry to be treated for the first time is 200 grams per cubic meter. After mixing with the biogas slurry evenly, it will settle for more than 16 hours; after a treatment cycle, add new biogas slurr...

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Abstract

The invention relates to a method of efficiently purifying and comprehensively utilizing biogas slurry. The method of efficiently purifying and comprehensively utilizing the biogas slurry is characterized by comprising the following steps: adding a purifying agent for a primary sedimentation after pumping excessive biogas slurry at an upper layer of a biogas digester; performing primary filtering after the sedimentation to filter out coarse impurities in the biogas slurry; performing secondary filtering to filter out fine impurities in the biogas slurry; performing a secondary sedimentation after heating the secondarily filtered biogas slurry at a high temperature and filtering the biogas slurry; performing tertiary filtering after the sedimentation to filter out sediments and impurities in the biogas slurry; performing quartus filtering after the tertiary filtering to filter out the fine impurities in the biogas slurry; and storing the treated biogas slurry as manure for roots and leaves of plants or as a plant pest inhibitor. The method of efficiently purifying and comprehensively utilizing the biogas slurry according to the invention has the advantages of high purification degree, wide application of purified biogas slurry and improved resource utilization level of wastes; the purifying agent used in the invention can be recycled after being heated and crystallized, so that cost is lowered; and the method according to the invention has the advantages of no waste discharge, environmental protection, simplicity, large treatment capacity, wide application range and low cost.

Description

technical field [0001] The invention relates to a method for high-efficiency purification and comprehensive utilization of biogas slurry, which belongs to the technical field of waste resource utilization, and in particular to a waste resource recovery and biogas slurry concentration and purification system. Background technique [0002] my country is a country that consumes a lot of energy. Improving the resource utilization rate of waste is an effective way to eliminate the energy crisis. Our current laws and policies encourage the resource utilization of waste from different angles to reduce environmental pollution. [0003] The development of biogas is an effective conversion method of bio-energy and an effective way to rationally utilize bio-energy. The development of biogas will effectively solve the problem of insufficient energy supply. However, after biogas fermentation, a large amount of biogas slurry produced will pollute the environment, and the biogas slurry is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/02C02F1/5236C02F9/00C02F2301/08
Inventor 徐建玲王汉席刘学军
Owner NORTHEAST NORMAL UNIVERSITY
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