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Method for producing biogas by garbage union fermentation

A combined fermentation and biogas technology, applied in fermentation, biological sludge treatment, sludge treatment, etc., can solve the problems of easy acidification and low gas production rate, and achieve the effect of avoiding acidification

Inactive Publication Date: 2011-03-23
LIAONING BEIFANG ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through this technology, the construction scale of biogas projects is much larger than that of livestock and poultry manure, sludge from urban sewage treatment plants and organic waste that are separately fermented, and the unit investment and operation and maintenance costs are reduced by more than 10%. Significantly increased (increased by more than 25%) during separate fermentation, which can avoid problems such as low gas production rate of sludge alone fermentation, and easy acidification of organic waste fermentation alone

Method used

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  • Method for producing biogas by garbage union fermentation

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Embodiment 1

[0015] Relying on a large-scale biogas project for livestock and poultry breeding, the volume of the main anaerobic reaction tank is 2000m 3 , the anaerobic digestion sludge in the sludge digestion anaerobic reactor of the urban sewage treatment plant is used as the inoculation sludge, and the inoculation sludge amount is 20% of the designed volume of the reactor. The mass ratio of organic waste, urban sewage treatment plant sludge, and livestock and poultry manure (cow dung) is designed in accordance with 1:3:3. The particle size of organic waste after crushing is less than 0.5cm. The concentration of solids in the feed is 10%, and the feeding method is intermittent feeding, 4 times a day, 15 minutes each time, and the daily feeding amount is 1 / 25 of the designed volume of the reactor. The amount of material is equivalent, the amount of material in the reactor accounts for 90% of the designed volume of the reactor, the hydraulic retention time of the material in the reactor ...

Embodiment 2

[0017] Design an anaerobic reactor with a volume of 20L. The anaerobic digestion sludge in the anaerobic reactor of the manure treatment biogas project of the livestock and poultry breeding plant is used as the inoculation sludge, and the amount of inoculation sludge is 20% of the designed volume of the reactor. The mass ratio of organic waste, urban sewage treatment plant sludge, and livestock and poultry manure (cow dung) is designed in accordance with 1:3:3. The particle size of organic waste after crushing is less than 0.1cm. The solids concentration in the feed was 12%, and the feeding method was intermittent feeding, once a day, 1 L each time. The amount of output is equivalent to the amount of feed, and the amount of material in the reactor accounts for 90% of the designed volume of the reactor. The pH of the material in the reactor is controlled between 6.9-7.2, and the reaction temperature is controlled at 35±1°C. After stable operation, the methane gas content in ...

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Abstract

The invention relates to a method for treating organic wastes by anaerobic fermentation, in particular to a method for producing biogas by performing union fermentation on livestock and poultry excrements, sludge from urban sewage treatment factories and organic garbage. The method comprises the following steps of: smashing the organic garbage; putting the smashed organic garbage into a comprehensive pretreatment pool and mixing the smashed organic garbage with the sludge from the urban sewage treatment factories and the livestock and poultry excrements; diluting the mixed materials to form suspension containing 8 to 12 percent of solids by using the sewage in a farm; and ensuring that the pretreated material meets the material feeding requirement of an anaerobic reactor and enters the anaerobic reactor through a material feeding pump and a pipeline to perform fermentation. The biogas produced by fermentation can be directly used as fuel gases for warming or cooking in treatment factories and surrounding farmers after being purified; the residual part is used for generating electricity for self-use or surfing the Internet by an biogas generator unit; biogas liquid and biogas residues are used as organic fertilizers and returned to farm land. By the technique, the scale of construction of the biogas engineering becomes larger, and unit investment and running maintenance cost are reduced by over 10 percent. Compared with the output of biogas produced by separate fermentation of the sludge or livestock and poultry excrements, the output of the biogas produced by the method is obviously enhanced.

Description

technical field [0001] The invention relates to a method for treating solid waste by anaerobic fermentation, in particular to a biogas production technology by combined fermentation of livestock manure, sludge from urban sewage treatment plants and organic waste. Background technique [0002] Anaerobic fermentation is to use facultative bacteria and anaerobic bacteria to degrade the organic matter in the reactor under anaerobic conditions, and convert the organic matter into clean energy—biogas, which can organically combine energy, environmental protection and a virtuous cycle of ecology. It has remarkable benefits and is one of the main methods for dealing with organic waste at present. For the treatment of organic waste, at present, my country mainly adopts sanitary landfill and anaerobic fermentation method for treatment. Sanitary landfill has a long history and mature technology for garbage disposal, but the cost is relatively high. The anaerobic fermentation process ...

Claims

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Application Information

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IPC IPC(8): C12P5/02C02F11/04
CPCY02E50/343Y02E50/30Y02W10/20
Inventor 赵军郎咸明杨明珍刘一威汪国刚包震宇
Owner LIAONING BEIFANG ENVIRONMENTAL PROTECTION
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