Technique of producing fertilizer, producing gas by digesting organic waste in semi-solid state in two phases

An organic waste, semi-solid technology, applied in the directions of organic fertilizer, organic fertilizer preparation, waste fuel, etc., can solve the problems of low value of the final product fertilizer, incomplete killing of pathogenic bacteria, and inability to recover energy, etc., and achieve a simple structure. , a wide range of applications, to achieve the effect of zero emissions

Inactive Publication Date: 2006-12-06
张相锋
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Problems solved by technology

At present, the digestion process developed and applied at home and abroad is mainly for the purpose of purifying pollutants, and there are probl

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  • Technique of producing fertilizer, producing gas by digesting organic waste in semi-solid state in two phases

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[0008] The present invention will be further described below in conjunction with the drawings.

[0009] First, the semi-solid organic waste is initially cleaned of coarse impurities, and then enters the first stage of high temperature microaerobic digestion unit 1 to supply oxygen to the high temperature microaerobic digestion unit 1 to maintain the dissolved oxygen concentration of the semi-solid waste in the unit. 0.1~0.8mg / L. In the microaerobic state, many aerobic and facultative aerobic microorganisms can digest and degrade organic waste, consume oxygen and release heat at the same time, so as to realize the spontaneous temperature rise of the high-temperature microaerobic digestion unit 1, and the volatility in the semi-solid organic waste When the solid concentration is above 3%, the temperature of the digestion liquid of the high-temperature microaerobic digestion unit 1 can reach above 55℃, and the temperature of the digestion liquid can be maintained at 55℃~70℃ for 1~3 d...

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Abstract

This invention discloses a two-stage method for producing fertilizer and sludge gas from semi-solid organic waste. The method comprises: (1) decomposing semi-solid organic waste in a slightly aerobic condition by microorganisms to generate heat and obtain small molecule substances such as volatile fatty acids; (2) digesting the small molecule substances in an anaerobic condition to generate sludge gas. The final product after treatment is nutritious, and does not have special odor or disease germs, thus is a high quality organic fertilizer. The method has such advantages as no waste discharge and no pollution, and is energy saving.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a two-stage semi-solid organic waste digestion fertilizer and gas production process for manure sewage from farms, sludge from sewage treatment plants, food processing residues and swill. Background technique [0002] Many organic wastes are in a semi-solid state, such as manure from livestock and poultry farms, swill, food processing waste, etc. Due to their high concentration of organic matter, they are more harmful to the environment. Its main idea of ​​treatment is to treat semi-solid organic waste as high-concentration organic wastewater, and to discharge pollutants up to standard as the goal. There are two main treatment technologies at present: one is to use solid-liquid separation equipment to turn them into solid waste and high-concentration organic wastewater, and then treat them separately; the other is to add water to reduce the solid content of sem...

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Application Information

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IPC IPC(8): C05F17/02
CPCY02E50/343Y02E50/30Y02W30/40
Inventor 张相锋
Owner 张相锋
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