Method for improving anaerobic biological treatment to produce high-purity methane

Abstract

The invention provides a method for improving anaerobic biological treatment to produce high-purity methane. The method comprises eight steps, the content of effective gas methane in the finally obtained biogas is 80-85%, the amount 0.4m<3> of methane converted in 1kg of COD (chemical oxygen demand) is greater than a theoretical calculating value of 0.35m<3> of methane converted in the 1kg of COD. The method disclosed by the invention has the effects that the organic material decomposition ability of anaerobes is improved by improving a biological concentration of the anaerobes in the anaerobic biological treatment and providing a high-quality and stable living environment for producing high-purity methane, organic pollutants in high-concentration organic wastewater are efficiently decomposed and converted into biogas, the active ingredient methane in the biogas is high in content, the COD in effluent is obviously reduced, the process flow is simple, safe, stable and low in treatment cost, and the floor area is small. The hydraulic retention time is short, the sludge output is low, the organic material decomposition rate is high, the biogas yield is high, the active gas methane in the biogas is high in content, and the COD removal rate is high.

Description

technical field [0001] The invention relates to a method for improving anaerobic biological treatment to produce high-purity methane. Background technique [0002] Anaerobic biological treatment is to use the metabolic process of anaerobic microorganisms to convert organic pollutants in water into inorganic substances and a small amount of cellular substances without providing oxygen. These inorganic substances mainly include biogas and water. The main components of biogas are methane and carbon dioxide. [0003] In the process of anaerobic digestion, the metabolic processes of various microorganisms interact and interfere with each other, forming a very complex biochemical process. It is usually divided into three stages. In the first stage, under the action of hydrolysis and fermentation bacteria, carbohydrates, proteins and fats are hydrolyzed and fermented, and converted into simple sugars, amino acids, fatty acids, glycerol, CO2 and hydrogen, etc.; Under the action of...

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Problems solved by technology

[0007] Aiming at the structural deficiencies in the prior art, the purpose of the present invention is to provide a method for improving the production of high-purity methane by anaerobic biological treatment, which is used to solve the problem of low biogas production in the existing anaerobic biological treatment. The problem with low gas methane content

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