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A method for preparing biogas from kitchen waste, urban sludge and urban excrement

A technology for municipal sludge and kitchen waste, applied in biological sludge treatment, waste fuel, fermentation, etc., can solve the problems of incomplete fermentation of materials and low gas production rate, and achieve energy saving, high gas production rate, and material The effect of complete fermentation

Inactive Publication Date: 2011-12-21
ZHONGCHENG HONGTIAN BEIJING ENVIRONMENT TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing biogas by combined anaerobic fermentation of kitchen waste, urban sludge and urban excrement, so as to solve the problems of incomplete fermentation of materials and low gas production rate in the preparation of biogas by combined anaerobic fermentation

Method used

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  • A method for preparing biogas from kitchen waste, urban sludge and urban excrement
  • A method for preparing biogas from kitchen waste, urban sludge and urban excrement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Pretreatment system

[0021] The food waste transported into the factory is directly sent to the receiving hopper (the bottom of the receiving hopper is equipped with a spiral dehydration device), and is automatically sorted (picking out various large bones, cooking utensils, long-fibrous packaging bags, tablecloths, ironware, etc. Foreign substances larger than 60mm), crushing, pulping, and sand removal; the remaining sludge in urban sewage treatment plants has a moisture content of more than 75%, while the urban feces has a water content of more than 80%, which is treated by pulping and sand removal; Food waste, urban sludge and urban excrement undergo a pretreatment process to obtain materials with a particle size of less than 20-25mm.

[0022] (2) Homogeneous system

[0023] After the treatment in step (1), the food waste material particles first enter the homogenizing tank, stir and heat to 35°C for 8-12 days for hydrolysis, then mix in feces and sludge materi...

Embodiment 2

[0031] (1) Pretreatment system

[0032] With embodiment 1.

[0033] (2) Homogeneous system

[0034] The material processed in step (1) is pumped into the homogenization tank for material homogenization. The above materials enter the homogenizing tank one after another. The kitchen waste first enters the homogenizing tank, then stirs and heats to 35°C for 8-10 days for hydrolysis, then mixes with feces and sludge for 2 hours of reaction, and then is pumped to the anaerobic fermentation tank . The temperature compensation system in the homogenizing tank adjusts the temperature of the material to 35°C, and the pH of the uniformly mixed material is adjusted to 6.5-7.5. The residence time of the mixed material in the homogenizing tank is about 2 hours, so that the particle size of the solid material Reduce to below 20-25mm, and adjust the carbon-nitrogen ratio (25:1-30:1) of the material at the same time, and the solid content rate is 8-12%.

[0035] (3) Anaerobic fermentation ...

Embodiment 3

[0042] (1) Pretreatment system

[0043] With embodiment 1.

[0044] (2) Homogeneous system

[0045] The material processed in step (1) is pumped into the homogenization tank for material homogenization. The above materials enter the homogenizing tank one after another. The food waste first enters the homogenizing tank, then stirs and heats to 35°C for 10-12 days for hydrolysis, then mixes with feces and sludge for 2 hours of reaction, and then is pumped to the anaerobic fermentation tank . The temperature compensation system in the homogenizing tank adjusts the temperature of the material to 35°C, and the pH of the uniformly mixed material is adjusted to 6.5-7.5. The residence time of the mixed material in the homogenizing tank is about 2 hours, so that the particle size of the solid material Reduce to below 20-25mm, and adjust the carbon-nitrogen ratio (25:1-30:1) of the material at the same time, and the solid content rate is 8-12%.

[0046] (3) Anaerobic fermentation sy...

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Abstract

A method for preparing biogas by joint anaerobic fermentation of food waste, urban sludge and urban excrement, comprising the following steps: (1) pretreatment system: food waste, urban sludge and urban excrement undergo a pretreatment process to obtain granules (2) homogeneous system: the materials processed in step (1) enter the homogenizing tank one after another, mix evenly and degrade part of the suspended matter, so that the particle size of the solid material is less than 20-25mm, and obtain Fermentation substrate with a solid content rate of 8 to 12%; (3) anaerobic fermentation system: the fermentation substrate treated in step (2) is transported to an anaerobic fermentation tank by a pump and adopts a continuous fermentation process and a mesophilic anaerobic fermentation The anaerobic fermentation method combined with jet stirring produces biogas, biogas residue and biogas slurry. The combined anaerobic fermentation preparation method of the present invention has the effects of complete material fermentation and high gas production rate.

Description

technical field [0001] The invention relates to a method for preparing biogas, in particular to a method for preparing biogas by combined anaerobic fermentation of kitchen waste, urban sludge and urban excrement. Background technique [0002] With the continuous increase of urban population, the amount of domestic waste of urban residents is gradually increasing. The use of urban waste, especially kitchen waste, residual sludge and urban waste from sewage treatment to produce energy gas is a new problem faced by urban waste treatment. , environmental pollution and energy shortage are important problems brought about by urbanization. [0003] The so-called kitchen waste refers to the waste produced in the process of kitchen food processing and the leftover food on the dining table, which is a kind of domestic waste formed by residents in the process of living consumption. Compared with other garbage, it has the characteristics of high moisture, organic matter, oil and salt c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30
Inventor 唐俊柏张红艳闫大志孙晓奇
Owner ZHONGCHENG HONGTIAN BEIJING ENVIRONMENT TECH DEV
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