Rapid domestication and enrichment method of alkali-tolerant sulfur-oxidizing bacteria for biogas biodesulfurization

Abstract

The invention discloses a rapid domesticating and enriching method of alkali-resisting sulfur oxidizing bacteria used for biogas biological desulfurization. A sequencing batch reactor (SBR) and a continuous stirred tank reactor (CSTR) are used for domesticating and enriching the alkali-resisting sulfur oxidizing bacteria needed for biogas biological desulfurization. The method comprises the steps that firstly, secondary sludge from an urban sewage treatment plant is inoculated in the SBR and is domesticated under normal temperature and high-pH conditions, the concentration of sulfide is increased gradually, and sulfur oxidizing bacteria in the inoculated sludge are selectively domesticated and cultured; secondly, after the sludge is domesticated, operation of the SBR is changed to operation of the CSTR, the hydraulic retention time is shortened, the aeration quantity is increased, the concentration of sulfide is increased gradually, and the alkali-resisting sulfur oxidizing bacteria are successfully enriched; and finally, the aeration quantity is reduced, so that the surplus sludge in effluent is reduced while the operation cost is reduced. The method solves the problems that starting is slow and requirements for seed sludge are strict in a traditional direct continuous culturing mode, and effectively shortens the enriching time of the alkali-resisting sulfur oxidizing bacteria.

Description

technical field [0001] The invention belongs to the field of sludge domestication, and in particular relates to a rapid domestication and enrichment method for alkali-resistant sulfur-oxidizing bacteria used for biogas biodesulfurization. Background technique [0002] Biogas has a high calorific value because it contains about 60% to 70% methane, and has attracted much attention today when energy is increasingly scarce. Normally, biogas contains 0.01~1.00% (v / v) H 2 S, its source is mainly due to the decomposition of protein by microorganisms or the reduction of sulfate. h 2 S seriously affects the safety of biogas production and utilization. h 2 After S is inhaled into the human body, the respiratory system, circulatory system, digestive system and nervous system will be seriously affected, even death. When the biogas is burned, the H in it 2 S is oxidized to SOx, which will not only pollute the environment, but also corrode equipment, seriously affecting the atmosphe...

AI Technical Summary

Problems solved by technology

The wet oxidation method has disadvantages such as poor solution stability, prone to side reactions, incomplete regeneration, and high investment costs.

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