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Sludge, excrement and kitchen waste synergistic anaerobic digestion process

A technology of kitchen waste and anaerobic digestion, applied in sludge treatment, biological sludge treatment, pyrolysis treatment of sludge, etc., can solve the problems of high cost, secondary pollution, poor effect, etc. and harmless treatment, reducing external emissions, and improving the effect of material dewatering performance

Inactive Publication Date: 2019-06-28
GUANGXI TEACHERS EDUCATION UNIV
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  • Abstract
  • Description
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Problems solved by technology

There are separate treatment technologies for kitchen waste and feces waste, but the separate treatment methods have problems such as high cost, complicated management, poor effect, and secondary pollution.

Method used

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  • Sludge, excrement and kitchen waste synergistic anaerobic digestion process

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Embodiment Construction

[0023] The technology and detailed description of the present invention will be described below in conjunction with the accompanying drawings, but this does not constitute a limitation to the protection scope of the present invention.

[0024] Process flow of the present invention such as figure 1 shown. The process includes food waste pretreatment, sludge and manure pretreatment, and main treatment.

[0025] 1. Food waste pretreatment

[0026] Food waste pretreatment includes: unloading and feeding, multi-stage screening and crushing, oil-water separation and pulping.

[0027] (1) Unloading and feeding

[0028] After the vehicle loaded with food waste is weighed by the floor scale, it drives to the unloading hall, and dumps the food waste into the receiving hopper of the material receiving device. The shaftless screw conveyor with draining function at the bottom of the receiving hopper transports the food waste to the machine. sorting machine.

[0029] In order to reduce...

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Abstract

The invention discloses a sludge, excrement and kitchen waste synergistic anaerobic digestion process. The process comprises the following steps: uniformly mixing pretreated kitchen waste with sludgeand excrement, regulating the water content to 90 percent, cooling to 38 DEG C, and performing an anaerobic digestion reaction in a medium-temperature anaerobic digestion tank for 20 days, using the generated methane part in a steam boiler, preparing natural gas from the rest part, and pretreating kitchen waste and heating in pyrohydrolysis with steam; concentrating biogas residues and biogas slurry to enable the sold content to be 15 percent, performing homogeneous pulping and pyrohydrolysis reaction, cooling the reacted material to 80 DEG C, dehydrating and drying until the water content islower than 40 percent to prepare nutrient soil; recycling part of biogas slurry generated in the dehydrating process, and draining the rest part into a sewage treatment plant for treatment. The process can be used for comprehensively treating sludge, excrement and kitchen waste to generate natural gas and nutrient soil, biogas slurry in the process flow can be refluxed and utilized to reduce external emission, resource, emission reduction and innocent treatment of sludge, excrement and kitchen waste can be realized.

Description

technical field [0001] The invention belongs to the technical field of combined treatment of sludge, feces and kitchen waste, in particular to a collaborative anaerobic digestion process for sludge, feces and kitchen waste. Background technique [0002] The pollution of sludge, feces and kitchen waste has always been an important issue in the field of environmental protection. The composition of sludge is very complex, including solid particles such as mud, sand, fibers, animal and plant residues mixed in domestic sewage or industrial wastewater, and their coagulated flocs, bacterial micelles formed by various microorganisms and their adsorbed organic matter, Heavy metal elements and salts, a small amount of pathogenic microorganisms, parasite eggs and other comprehensive solid substances. The main characteristics of sludge are high water content, high organic matter content, easy to rot and smell, and the particles are finer, the specific gravity is smaller, and it is in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/00C02F11/10C02F11/121C02F101/30C02F103/20
CPCY02E50/30
Inventor 宇鹏
Owner GUANGXI TEACHERS EDUCATION UNIV
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