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Method for producing methane as clean energy source by utilizing catering organic waste

An organic waste, clean energy technology, applied in waste fuel, biological sludge treatment, fermentation and other directions, to achieve the effect of less heat supply, thorough sterilization, and large biological gas production

Active Publication Date: 2010-06-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The fermentation process is carried out in a vertical reactor without mechanical agitation, but The leachate at the bottom of the reactor is refilled

Method used

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  • Method for producing methane as clean energy source by utilizing catering organic waste

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Effect test

Embodiment 1

[0041] The reaction was carried out using a 1 L reactor. Take 50 grams of starch-based catering organic waste with a water content of 75%, add 550 grams of the above-mentioned domesticated activated sludge, add water to 800 mL, control the temperature at 15 degrees Celsius, and carry out fermentation. The reaction is carried out continuously, and the anaerobic state is strictly controlled throughout the process to facilitate the growth of anaerobic microorganisms. Raw materials were added by flow addition, and 40 grams of starch-based catering organic waste was added every 10 days. Continuous fermentation for 200 days, the average daily gas production during the fermentation process was 400mL, the methane content in the produced gas was 60%, the removal rate of TS was 60%, the removal rate of VS was 78%, and the removal rate of COD was 55.1%.

[0042] The invention directly mixes domesticated sludge with raw materials and water during anaerobic fermentation for the preparatio...

Embodiment 2

[0044] Embodiment 2: utilize 1L reactor to carry out reaction. Take 20 grams of cellulose-based catering organic waste with a water content of 70%, add 50 grams of domesticated activated sludge, add water to 800 mL, control the temperature at 20 degrees Celsius, and carry out fermentation. The reaction is carried out continuously, and the anaerobic state is strictly controlled throughout the process to facilitate the growth of anaerobic microorganisms. Raw materials were added by flow addition method, and 25 grams of cellulose-based catering organic waste was added every 15 days. Continuous fermentation for 150 days, the average daily gas production during the fermentation process was 500mL, the methane content in the produced gas was 65%, the removal rate of TS was 68.4%, the removal rate of VS was 76%, and the removal rate of COD was 66%.

Embodiment 3

[0045] Embodiment 3: use 1L reactor to carry out reaction. Take 100 grams of catering organic waste mainly composed of oil, with a water content of 80%, add 600 grams of domesticated activated sludge, add water to 800ml, control the temperature at 37 degrees Celsius, and carry out fermentation. The reaction is carried out continuously, and the anaerobic state is strictly controlled throughout the process to facilitate the growth of anaerobic microorganisms. Raw materials were added by flow addition, and 1 gram of catering organic waste, mainly oil, was added every other day. Continuous fermentation for 125 days, the average daily gas production during the fermentation process was 750mL, the methane content in the produced gas was 71%, the removal rate of TS was 87%, the removal rate of VS was 90%, and the removal rate of COD was 87%.

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Abstract

The invention relates to a method for producing a clean energy source by a continuous feeding type anaerobic fermentation method, particularly to a continuous feeding type anaerobic fermentation method for preparing methane by fermenting catering organic waste. The method for producing the clean energy source through continuous feeding type anaerobic fermentation can be widely used for preparing the methane which is a clean energy source through the anaerobic fermentation of the catering organic waste, straws, animal excreta in farms and other organic waste. The method comprises the following steps of: draining partial moisture of the collected catering organic waste to enable the water content thereof to be not more than 80 percent, and then adding the processed catering organic waste and acclimated anaerobic activated sludge in a definite proportion into a reactor for fermentation. The catering organic waste is added into the reactor by adopting a continuous feeding method in the fermentation process, and a fermentation raw material is added once at regular intervals. An addition period is a gas production vigorous period. The addition is 0.1-10 percent of the volume of the reactor. An anaerobic state is strictly controlled in the whole process so as to facilitate the growth of anaerobes.

Description

technical field [0001] The invention relates to a method for producing clean energy by a continuous fed-batch anaerobic fermentation method, in particular to a continuous fed-batch anaerobic fermentation method for preparing methane from catering organic waste. The method for producing clean energy by continuous fed-batch anaerobic fermentation can be widely used in anaerobic fermentation of catering organic waste, straw, farm animal manure and other organic waste to produce clean energy methane. Background technique [0002] Catering organic waste mainly refers to leftover food from kitchens and dining tables, which refers to food residues and wastes produced in food processing, catering services, and unit meals other than residents’ daily life, such as starch, dietary fiber, fat, protein, etc. Mainly organic matter, with the characteristics of perishable, fermented and smelly. Because it contains a large amount of organic matter, it has recycling value after scientific tr...

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 苏海佳孙新升刘莎谭天伟
Owner BEIJING UNIV OF CHEM TECH
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