Method for increasing the yield of anaerobic digestion of sugarcane bagasse by pretreatment

Abstract

The invention discloses a method for increasing the output of bagasse anaerobic digestion biogas through pretreatment. The method comprises the following steps of: pretreating bagasse crushed aggregates to obtain pretreated bagasse; mixing active sludge suspension liquid and the pretreated bagasse, and then adding water for dilution to obtain a mixture, wherein the weight ratio of volatile solids contained in the pretreated bagasse and volatile solids contained in the active sludge suspension liquid in the mixture is (0.65-0.85):1, and the weight ratio of the total weight (namely the total weight of water contained in the pretreated bagasse and the water added for the dilution) of the water and the volatile solids contained in the pretreated bagasse is (16.8-24.6):1; transferring the mixture to an anaerobic digestion system, and fermenting under the condition of constant temperature of 35+ / -1 DEG C to produce the biogas. The method disclosed by the invention can increase the anaerobic digestion efficiency, thereby achieving the purpose of increasing biogas yield and methane content.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and resource utilization, and more specifically relates to a technology for increasing the biogas output of bagasse anaerobic digestion through pretreatment. Background technique [0002] Bagasse is the fibrous residue of sugarcane after crushing and extraction of cane juice, and is the main by-product of the sugar industry. Bagasse is mainly composed of cellulose, hemicellulose and lignin, and also contains a small amount of ash, protein, pectin and fat. my country's sugarcane output in 2012 was about 123 million tons, and bagasse accounted for at least 10% to 25% of the sugarcane mass, and more than 12.3 million tons of bagasse would be produced. [0003] At present, the technologies for large-scale concentrated processing of bagasse in China mainly include: ①, preparation of animal feed after treatment, use as a substrate for plant soilless cultivation or pulping and papermaking, the techn...

AI Technical Summary

Problems solved by technology

However, the pretreatment method of biomass raw materials for biogas production by anaerobic digestion needs to comprehensively consider the effect and cost of pretreatment and other factors. The cost of pretreatment of the mixed aqueous solution of sodium hydroxide and hydrogen peroxide is relatively high. ~65°C distilled water washing to neutral, drying and other steps, there is no data to explain the specific impact of this bagasse pretreatment method on improving the efficiency of anaerobic digestion to produce biogas, therefore, the economical and effective pretreatment method is bagasse anaerobic digestion. A major problem that needs to be solved urgently in the biogas process

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