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Treatment method for efficient anaerobic production of acid and gas from kitchen waste

A technology of kitchen waste and a treatment method is applied in the field of efficient anaerobic acid production and gas production of kitchen waste, so as to achieve the effects of speeding up the process of biogas production, avoiding excessive organic content and high biogas production efficiency

Inactive Publication Date: 2019-04-19
常州市环境卫生管理处
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing organic solid waste resource treatment, the present invention provides a treatment method for high-efficiency anaerobic acid and gas production of kitchen waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one (sequential batch type):

[0031] The pretreated kitchen waste and anaerobic residual sludge were mixed in a mass ratio of 5:1, the solid content of the mixture was 5%, and the concentration of volatile fatty acids (VFA) in the mixed solution before fermentation was 1.5mmol / L. The pH is 5.8, the operating conditions of the acid production equipment are set at a temperature of 35.0°C, a stirring speed of 90 rpm, and the acid production fermentation tank is operated for 5 days, the pH reaches 3.75, and the concentration of VFA in the mixed solution after fermentation is 88.5mmol / L.

[0032] After the acid-producing fermentation is completed, the mixed liquid is pumped into the solid-liquid separation device. After separation, 20% of the separated liquid is pumped into the gas-producing reactor, where it is mixed with the anaerobic sludge mixed liquid at a ratio of 1:10 , the operating conditions of the gas production equipment were set at a temperature of 3...

Embodiment 2

[0033] Embodiment two (sequential batch formula):

[0034]The pretreated kitchen waste and anaerobic residual sludge were mixed at a mass ratio of 4:1, the solid content of the mixture was 10%, the VFA concentration in the mixed solution before fermentation was 3.45 mmol / L, and the pH was 5.3. The operating conditions of the acid equipment are set at a temperature of 35.0°C, a stirring speed of 90 rpm, and the acid-producing fermentation tank is operated for 5 days, the pH reaches 3.1, and the concentration of VFA in the mixed liquid after fermentation is 108.8mmol / L.

[0035] After the acid-producing fermentation is completed, the mixed liquid is pumped into the solid-liquid separation device. After separation, 20% of the separated liquid is pumped into the gas-producing reactor, where it is mixed with the anaerobic sludge mixed liquid at a ratio of 1:8 , the operating conditions of the gas production equipment were set at a temperature of 35.0°C and a stirring speed of 90rpm...

Embodiment 3

[0036] Embodiment three (continuous)

[0037] The pretreated kitchen waste and anaerobic residual sludge were mixed at a mass ratio of 5:1, the solid content of the mixture was 5%, the VFA concentration in the mixed solution before fermentation was 1.5mmol / L, and the pH was 5.8. The operating conditions of the acid equipment were set at a temperature of 35.0°C and a stirring speed of 90 rpm. The acid-producing fermenter was run for 5 days, the pH reached 3.75, and the concentration of VFA in the mixed liquor after fermentation was 88.5mmol / L. Turn on the peristaltic pump and pump it into the solid-liquid separation device at a flow rate of 10ml per minute. The solid-liquid separation device will separate the mixed liquid at a flow rate of 10ml per minute to the gas generating reactor, and the acid generating reactor will feed 10ml of food waste and anaerobic residue per minute. Sludge is mixed with liquid at a mass ratio of 5:1. The hydraulic retention time is 5 days, and the...

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Abstract

The invention relates to the technical field of resource-based treatment of organic solid waste, in particular to a treatment method for efficient anaerobic production of acid and gas from kitchen waste, which comprises the following steps of: 1) pretreating the kitchen waste; 2) producing acid by anaerobic fermentation; 3) carrying out solid-liquid separation and reflux of organic acids; and 4) producing biogas efficiently through an organic acid separation solution. By the adoption of the treatment method for high efficient anaerobic production of acid and gas from the kitchen waste, fast and efficient anaerobic fermentation of the kitchen waste to produce acid and biogas is achieved; generation of a large amount of the organic acids due to an excessive organic content of the kitchen waste in an anaerobic digestion process is effectively avoided, thereby preventing inhibition of a subsequent anaerobic process due to low pH of a reaction system; a secondary regulation of the pH of thereaction system is not necessary; the process of the production of biogas is greatly accelerated; high efficiency of the production of biogas is achieved; and fast speed and high degree of automationare achieved.

Description

technical field [0001] The invention relates to the technical field of organic solid waste resource treatment, in particular to a treatment method for high-efficiency anaerobic acid and gas production of kitchen waste. Background technique [0002] In recent years, with the rapid development of social economy and the rapid improvement of people's living standards, the output of kitchen waste has shown an obvious upward trend. Currently, about 40% of urban waste is food waste. Kitchen waste is mainly composed of organic matter such as starch, protein, dietary fiber, and animal fat. Its organic matter content and moisture content are relatively high, and it is easy to ferment, deteriorate, and rot. These characteristics determine that kitchen waste is a kind of pollution. It is also a kind of resource that can be used, if it is not handled properly, it will pollute water, soil and air. In recent years, my country has gradually realized the centralized collection and treatmen...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCC02F11/04
Inventor 于斌张晓叶乌佳凌
Owner 常州市环境卫生管理处
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