Paracoccus versutus strain and application thereof

Abstract

The invention discloses a paracoccus versutus (Paracoccus versutus) strain 2#CGMCC No. 13321 and application thereof for oxidizing nitrate serving as an electron acceptor to remove hydrogen sulfide (H2S) in biogas under anoxic conditions. The strain is subjected to Gram staining to be negative, and the strain cells are in a shape of short rods and are small; the bacterial colony is white and bulged, the edge is neat and smooth, and the surface is wet; the strain is not salt-tolerant, and citrate cannot be utilized; and in the presence of nitrate, nitrite or nitrogen oxide, anaerobic growth of the strain can be promoted by taking nitrate, nitrite and nitrogen oxide as electron acceptors. After the paracoccus versutus strain CGMCC No.13321 is inoculated to a desulfurization reactor, the H2S can be subjected to biological oxidation in the reactor by taking the nitrate as the electron receptor and then is subjected to growth and propagation, the aim of removing the H2S in the biogas is achieved, the potential safety hazard brought by mixing of the introduced methane and oxygen in the traditional method for removing the H2S in the biogas by taking the oxygen as the electron acceptor is effectively avoided, and the removal rate of the H2S in the biogas is up to 93.8%.

Description

technical field [0001] The present invention relates to a paracoccus bacterial strain, in particular to a method that can utilize nitrate as an electron acceptor to oxidize and remove hydrogen sulfide (H 2 S) Paracoccus mutans strain. Background technique [0002] Biogas is an emerging clean and renewable energy. Anaerobic fermentation technology with biogas as the target product has been more and more widely used because of its good energy and environmental benefits. It will be of great significance to alleviate my country's energy crisis and protect the environment. Biogas is a kind of biofuel produced by anaerobic fermentation of biological raw materials. The biological raw materials used for anaerobic fermentation of biogas mainly include livestock and poultry manure, straw, energy plants, domestic garbage, organic wastewater and other wastes. At present, the main raw materials for biogas fermentation in my country are manure and sewage from livestock and poultry farms....

AI Technical Summary

Problems solved by technology

Photoautotrophic microorganisms remove H 2 S process, although a higher H 2 S removal rate and no safety hazards under anaerobic conditions, etc., but requires a large amount of radiant energy, its economic cost is high, and it is easily limited by the light source

Therefore, chemoautotrophic microorganisms become the biological removal of biogas H 2 A better choice for S. Under the condition of aerobic presence, chemoautotrophic microorganisms use oxygen as an electron acceptor, but the regulation of oxygen is difficult, and there is a danger of explosion when there is too much oxygen supply. At the same time, nitrogen and other gases will be introduced at the same time Inert gas, which reduces the concentration of methane in the biogas and reduces the energy efficiency of the biogas

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