Method for carrying out anaerobic digestion on kitchen waste after heat-moisture treatment

A technology of moist heat treatment and anaerobic digestion, which is applied in the fields of disposal, harmless solid waste, and resource treatment, and can solve problems such as reducing the effective utilization rate of resources, rapid acidification of materials, and difficulty in collecting, transporting and processing food waste. , to prevent the acidification of materials, improve the oil recovery rate, and ensure the stability of anaerobic digestion

Inactive Publication Date: 2012-06-13
BMEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) The chemical composition is complex, mainly including water, inorganic salts, organic acids and various macromolecular organic compounds
[0005] (2) Rich in organic matter, microorganisms are easy to grow and reproduce, causing food waste to deteriorate and pollute the environment
[0006] (3) The water content is as high as 80%, which brings certain difficulties to the collection, transportation and treatment of kitchen waste, and the leachate of kitchen waste pollutes surface water and groundwater through surface runoff and infiltration
One is the high oil content of food waste, which leads to rapid acidification of the material, which affects the performance of anaerobic digestion; the other is that the high salt content of food waste makes the digestive juice obtained after anaerobic digestion too high in salt and cannot be used as soil fertilizer , reducing the effective utilization of resources

Method used

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  • Method for carrying out anaerobic digestion on kitchen waste after heat-moisture treatment
  • Method for carrying out anaerobic digestion on kitchen waste after heat-moisture treatment

Examples

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Effect test

Embodiment 1

[0029] With reference to the accompanying drawings, the detailed steps of the anaerobic digestion method after the wet heat treatment of the kitchen waste of the present invention are as follows:

[0030] 1. In the pretreatment step, the kitchen waste is transported to the waste disposal point in a professional airtight garbage bin, weighed and then sent to the pretreatment system for crushing, sorting and sedimentation separation pulping steps. The crushing process not only crushes the material to less than 50mm to meet the follow-up process, but also removes metals, stones, glass and other impurities with large specific gravity. In the sorting process, impurities with light specific gravity such as plastic bags are removed by screening to avoid subsequent stirring and entanglement. The sedimentation separation pulping process includes a mixer and a crushing pump to complete the pulping of the material in a cycle, so that the particle size of the material reaches below 10mm. ...

Embodiment 2

[0039] Embodiment 2: A method for anaerobic digestion of kitchen waste after high temperature and heat treatment, comprising the following steps:

[0040] 1. Unloading:

[0041] The food waste is transported to the unloading workshop of the factory area, and the collected food waste is discharged to the material tank for airtight storage. There is a screw conveyor at the bottom. Drop off a portion and collect in the sink.

[0042] The material is conveyed on the belt conveyor, and the preliminary manual screening is carried out on the belt conveying equipment to remove metals, stones, glass, etc. with a large proportion in the kitchen materials, and then transported to the double-shaft crusher for crushing.

[0043] 2. Pretreatment:

[0044] It includes crushing process, sorting and sedimentation separation pulping steps. In order to ensure that there will be no unorganized discharge of odor and sewage spillage, the entire pretreatment process is completed in a closed state...

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Abstract

The invention relates to a method for carrying out anaerobic digestion on kitchen waste after heat-moisture treatment, belonging to the technical fields of harmless resource treatment and disposal of solid waste. The method comprises the following steps of: pre-treatment, high-temperature heat-moisture treatment, de-oiling, anaerobic digestion, biogas residue dehydration treatment of the kitchen waste, and the like. The method disclosed by the invention has the following advantages that: (1) the kitchen waste ia sterilized before the anaerobic digestion; (2) the kitchen waste can be effectively de-oiled and the occurrence of oil acidification is prevented so that the follow-up anaerobic digestion process is more stable and the oil recovery is improved; and (3) salt content in the kitchen can be effectively desalinated so that the salt content in the biogas residue is decreased and the treated kitchen waste can be used as a good soil conditioner.

Description

technical field [0001] The invention relates to a method for performing anaerobic digestion after wet heat treatment of kitchen waste, and belongs to the technical fields of harmless, resourceful treatment and disposal of solid waste. Background technique [0002] With the development of economy and the acceleration of urbanization, the discharge of municipal solid waste is increasing, and the proportion of kitchen waste is increasing day by day, accounting for 37% to 62% of municipal solid waste. It is conservatively estimated that the annual output of urban kitchen waste in my country is no less than 60 million tons. [0003] Food waste comes from human food, so it is determined that food waste is quite different from general household waste and industrial production waste, and has its own characteristics: [0004] (1) The chemical composition is complex, mainly including water, inorganic salts, organic acids and various macromolecular organic compounds. [0005] (2) It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00B09B3/00
Inventor 李来庆许靖平张继琳王敬贤徐兆晶程龙
Owner BMEI
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