A kind of sludge anaerobic digestion additive and method for promoting methane production

Abstract

The invention relates to a sludge anaerobic digestion additive and a method for promoting methane production through the additive. The method includes the steps of putting 0.1-1.0% of dry papermaking white mud in sludge to be stirred with water to obtain a mixture material with the pH value of 7.5-8.0 and the solid content of 5-15%, putting the mixture material in an anaerobic reactor, and conducting sludge anaerobic digestion over stirring at a constant temperature of 35-38 DEG C or 53-55 DEG C. Papermaking white mud produced in sulfate method pulping, papermaking and causticizing procedures serves as the sludge anaerobic digestion additive, and the dynamic balance of sludge hydrolytic acidification and methanation is regulated and controlled in an oriented mode; the digestion time is shortened by 15-25%, and the methane yield is increased by 40-80%. Operation is easy, running expenses are low, and the pollution of papermaking white mud and sludge to the environment is reduced; after residues produced after sludge anaerobic digestion are subjected to solid-liquid separation, biogas residues serve as a soil conditioner and are directly applied to soil, and biogas slurry is directly used as water-soluble fertilizer.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a sludge anaerobic digestion additive and a method for promoting methane production thereof, in particular to a papermaking white mud additive and a method for promoting sludge anaerobic digestion to produce methane. Background technique [0002] With the rapid improvement of my country's sewage treatment capacity, the amount of sludge produced has also increased significantly. At present, about 3,700 sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of about 150-160 million cubic meters per day, and an annual output of 35-40 million tons of sludge with a water content of 80-90%. 10% speed increment. Anaerobic digestion refers to the biochemical process of using facultative bacteria and obligate anaerobic bacteria to decompose organic matter into methane and carbon dioxide under anaerobic conditions. Anaerobic ...

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Problems solved by technology

[0007] At present, there have been studies using papermaking white mud as an alkaline additive for dark fermentation to strengthen the fermentation of food waste to produce hydrogen. For example, the Chinese invention patent (application number 201110333252.2) significantly improved the stability and The hydrogen production rate improves the activity of hydrogen-producing bacteria; however, the residue after the hydrogen production of this type of waste fermentation accounts for 70-85% of the fermentation substrate, resulting in low raw material utilization; in addition, the solid-liquid separation of the fermentation residue The process of making biochar from slag (fermentation residue) has the defect of high energy consumption

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