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

A kind of organic waste and semi-solid technology, applied in the direction of solid waste removal, waste fuel, bio-organic part treatment, etc., can solve the problems of low value of final product fertilizer, incomplete killing of pathogenic bacteria, and inability to recover energy, etc., to achieve Simple structure, wide application range, and zero emission effect

Inactive Publication Date: 2009-05-13
张相锋
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AI Technical Summary

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 problems such as the inability to recover energy, or the incomplete killing of pathogenic bacteria, and the low value of the final product fertilizer.

Method used

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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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Embodiment Construction

[0008] The present invention will be further described below in conjunction with accompanying drawing.

[0009] Firstly, the semi-solid organic waste enters the high-temperature micro-aerobic digestion unit 1 in the first stage after preliminary cleaning of coarse debris, and supplies oxygen to the high-temperature micro-aerobic digestion unit 1 to maintain the dissolved oxygen concentration of the semi-solid waste in the unit. 0.1~0.8mg / L. In the micro-aerobic state, many aerobic and facultative microorganisms can digest and degrade organic waste, while consuming oxygen and releasing heat, so as to realize the spontaneous temperature rise of high-temperature micro-aerobic digestion unit 1, and the volatility in semi-solid organic waste When the solid concentration is above 3%, the temperature of the digestive liquid in the high-temperature micro-aerobic digestion unit 1 can reach above 55°C, maintain the temperature of the digestive liquid at 55°C-70°C, and keep it for 1-3 da...

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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, such as manure from livestock and poultry farms, sludge from sewage treatment plants, food processing residues, and swill, are in a flowing state, which contains 3% to 18% of volatile solids, and 30% of the total solids ~90% volatile solids, the present invention is called "semi-solid organic waste". Due to its high concentration of organic matter, it is 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-liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C05F15/00
CPCY02E50/30Y02W30/40
Inventor 张相锋
Owner 张相锋
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