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

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...

Examples

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...

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...

Examples

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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