An integrated wet and dry anaerobic digestion method

Abstract

The invention discloses an integrated dry-wet anaerobic digestion method. A dry anaerobic zone, a three-phase separation zone and a wet anaerobic zone are respectively arranged inside the digestion tank from bottom to top; the dry anaerobic zone is provided with stirring The agitator realizes the material stirring, and the organic material with a large particle size is degraded into a small-size material in the dry anaerobic zone, and a large amount of biogas bubbles are generated at the same time; the solid-phase material with a large particle size returns to the dry-type anaerobic zone through the three-phase separation zone. anaerobic zone, while the small particle size and liquid phase enter the wet anaerobic zone; the wet anaerobic zone is provided with a biogas aeration pipe, and the upper part of the wet anaerobic zone is provided with an upper discharge pipe, and the upper discharge pipe is used to overflow The way the water is discharged, the biogas produced by anaerobic enters the top air chamber above the wet anaerobic zone, and the top biogas pipe is set on the top of the top air chamber. The integrated dry-wet anaerobic digestion device provided by the present invention has high organic matter degradation rate, high biogas output, low biogas residue output, and good effluent quality, which can realize automatic and continuous biogas production of high-concentration organic solid waste, and is especially suitable for low moisture content and impurities. Anaerobic digestion of organic materials with high content.

Description

technical field [0001] The invention belongs to the technical field of organic material treatment, and relates to an anaerobic digestion process for organic materials, in particular to an integrated dry-wet anaerobic digestion method. Background technique [0002] The organic waste of the present invention includes catering waste, kitchen waste, municipal sludge, poultry manure, vegetable market waste, supermarket expired food, food processing waste, distiller's grains, agricultural organic solid waste and other high-concentration organic solid waste. The classification mechanism is not yet perfect in my country, and traditional organic waste is usually disposed of by landfill, incineration or aerobic composting. Due to the constraints of available land, landfills are facing more and more difficult site selection problems in my country; although incineration can achieve better reduction results, organic waste with a high moisture content often greatly increases the cost of in...

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Problems solved by technology

[0006] How to give full play to the respective advantages of wet and dry anaerobic, the traditional process adopts a split design, that is, after the dry anaerobic digestion is dehydrated, the liquid phase enters the wet anaerobic digestion, the process is complicated, the floor area is large, and It is necessary to set up an intermediate buffer and dehydration system. Since the dry anaerobic adopts a fully mixed digestion method, the output contains a large amount of undegraded organic matter. After passing through the dehydration system, only the liquid phase enters the wet anaerobic digestion, and the dehydrated solid phase remains Contains more undegraded organic matter

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