Method and device for producing bio-gas by organic waste

Abstract

The invention provides a method and a device for producing bio-gas by organic waste. The method comprises a pretreatment step, a solid state reaction step, a solid-liquid separation step, a liquid state reaction step, a bio-gas utilization and slag liquid processing step; the device comprises a pretreatment apparatus, a solid state anaerobic fermentation cylinder, a solid-liquid separator, a liquid state anaerobic fermentation cylinder, a bio-gas utilization apparatus and a slag liquid processing apparatus. The solid state anaerobic fermentation cylinder is respectively connected with the pretreatment apparatus and the solid-liquid separator, the solid-liquid separator is connected with the liquid state anaerobic fermentation cylinder, and the liquid state anaerobic fermentation cylinder is respectively connected with the bio-gas utilization apparatus and the slag liquid processing apparatus. According to the invention, the organic waste can be processed with solid-liquid two-stage diphasic anaerobic digestion, so that the method is capable of realizing the harmlessness of organic waste, quantitative reduction treatment and resourceful utilization, acquiring the renewable cleaning energy and satisfying the urgent requirements of energy saving, emission reduction and environmental protection.

Description

technical field [0001] The invention relates to the fields of organic waste treatment and renewable energy, in particular to a method and equipment for processing organic wastes to produce biogas by a two-stage two-phase anaerobic digestion system. Background technique [0002] Anaerobic digestion processes are well known in the industry for processing organic matter to produce biogas and other products. Anaerobic digestion technology can not only realize the harmless, reduction treatment and resource utilization of organic waste, but also obtain renewable and clean energy, which can meet the urgent requirements of energy saving, emission reduction and environmental protection. The organic waste can be such as municipal waste, agricultural waste, livestock manure, kitchen waste, or other organic source materials that can be converted into biogas and other products. [0003] The traditional single-phase wet anaerobic digestion technology is mainly suitable for the treatment ...

AI Technical Summary

Problems solved by technology

The above-mentioned two-phase anaerobic digestion system is carried out in batches, the overall pollution load of the system is still low, and the biogas production is unstable, so continuous and stable operation cannot be achieved

Another example: the Chinese invention patent application with the application number "200710144427.9" and the title "Method for Treating High-Concentration Organic Wastewater by Two-Stage Two-Phase Anaerobic Process" discloses a two-stage two-phase anaerobic process for treating high-concentration organic waste water , to solve the problem that the treatment effect of the existing single-stage anaerobic reactor is not easy to meet the treatment standard of high-concentration organic wastewater, but it does not involve the anaerobic digestion treatment of solid organic waste

The application number is "200810104975.3", and the Chinese invention patent application titled "A Method for Producing Biogas from Two-phase Multistage Anaerobic Fermentation of Organic Solid Wastes" discloses a system with high pollution load and stable biogas output, which realizes continuous operation The two-phase multi-stage anaerobic fermentation of organic solid waste to produce biogas, but the system is a sequencing batch process, and there is a risk of explosion or methane release when the reactor is emptied

[0005] Another example: the Chinese invention patent application with the application number "201010106904.4" and the name "Method for producing biogas by anaerobic digestion of high-solid perishable organic waste in two-phase three-stage", discloses a high-solid two-phase biogas production method for perishable organic waste. The three-stage anaerobic digestion biogas production method separates the hydrolysis acid production process and the acetogenic methane production process in the anaerobic digestion process, so as to avoid the organic acid produced by perishable organic waste from inhibiting the methanogenic effect, suitable for perishable The anaerobic digestion treatment of organic waste has efficient and stable anaerobic digestion of perishable organic waste to produce biogas, but the system structure of this method is complicated, and the sieve plate at the bottom of the solid percolation bed is easy to block, and it is not suitable for containing more sand and gravel. Materials with inert particles and complicated process control and operation

The application number is "201010130966.9", and the Chinese invention patent application titled "A method for generating biogas by enhanced hydrolysis and anaerobic digestion of urban domestic organic waste" discloses a wet two-phase anaerobic fermentation of urban domestic organic waste technology to improve organic matter removal rate and raw material gas production rate, and remove pathogenic bacteria in garbage, but it is necessary to add water or fermentation broth to adjust the solid concentration of raw material and control it within 15%, and the process needs to reduce the broken particle size of organic matter to 1cm Below, so it is still unable to overcome the disadvantages of wet fermentation technology

[0006] In short, the organic waste treatment methods in the prior art all have deficiencies. To develop a solid-liquid two-stage two-phase anaerobic digestion of organic waste to produce biogas with strong material adaptability, high pollution load, good stability and continuous production The method and system of the organic waste has become a key issue in the recycling, reduction and energy treatment of organic waste

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