Bacillus subtilis and application thereof

Abstract

The invention provides a strain of bacillus subtilis SWS3, which is preserved in China Center for Type Culture Collection on November 1, 2021, the preservation address is Wuhan University, and the preservation number is CCTCC M 20211349; the strain can be used for effectively degrading methyl mercaptan, 2-methyl episulfide ethane, butyric acid, valeric acid and eudesmol; the strain can degrade volatile substances in the kitchen waste low-temperature vacuum drying condensate within 48 hours, and the COD (Chemical Oxygen Demand) of the condensate is reduced from 2283 mg.L <-1 > to 134 mg.L <-1 >, so that the condensate directly meets the wastewater discharge standard.

Description

technical field [0001] The invention relates to a bacillus subtilis and application thereof, belonging to the field of waste water treatment. Background technique [0002] With the continuous development of my country's catering industry and the improvement of people's living standards, the discharge of kitchen waste is increasing day by day, and kitchen waste contains extremely high moisture and organic matter, which is easy to rot and produce stench. During the treatment process, in order to reduce the adverse effects of excessive moisture on the post-processing of garbage and its corrosion on equipment, it can be dried in a low-temperature vacuum first to reduce moisture and facilitate the next step of treatment. However, some volatile organic compounds (VOCs) will be produced during the low-temperature vacuum drying process. VOCs are important precursors for the formation of secondary pollutants such as fine particulate matter (PM2.5) and ozone (O3), which in turn cause h...

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Problems solved by technology

[0003] Chinese patent document CN201210129450 (application patent number CN103145292A) discloses a leachate treatment process and device in a small-scale garbage transfer station. The patent uses two treatment processes, micro-electrolysis and MBR, so that the COD of the leachate after treatment is 1000mg / L within, but still not up to emission standards

[0004] Chinese patent document CN113087275A (patent application number: CN202110525842.9) discloses a pretreatment system for landfill leachate. This patent can effectively remove pollutants such as suspended solids, heavy metals and ammonia nitrogen in landfill leachate, but cannot effectively Removal of remaining components in landfill leachate

[0005] Chinese patent document CN210711136U (patent application number 201920659099.4) proposes an intelligent integrated equipment for waste water treatment in a garbage transfer station. The patent design leachate passes through the coagulation reactor, anaerobic digestion tank, primary contact oxidation tank and secondary contact oxidation in sequence. Pools and MBR membrane bioreactors can obtain high-quality effluent, but the overall design process is too large, and the amount of sludge generated is mostly

[0006] Chinese patent document CN111646599A (patent application number CN202010560761.8) proposes a system for integrated treatment of leachate in a garbage transfer station. This patent only allows the leachate that has undergone coagulation and sedimentation to directly enter the NF and RO membrane treatment devices, although COD The removal efficiency reaches 99.6%, but the frequent replacement of the membrane causes the operation cost to be too high

[0007] The above-mentioned patent documents disclose a variety of treatment methods for landfill leachate, but the treatment process is complicated and the operating cost is too high; therefore, there is an urgent need for a microbial strain that can efficiently degrade volatile organic compounds (VOCs) in the treatment of waste liquid and waste gas to simplify the treatment. process, reducing operating costs for processing

[0008] Although there are many types of biological deodorants for waste gas treatment in the prior art, the disclosed biological deodorants are composed of a variety of microorganisms; Composite bacterial agent for waste gas, which is composed of Pseudomonas putida, Bacillus subtilis, Bacillus cereus, Thiobacillus thiooxidans, Lactobacillus plantarum, and Thiobacillus thiooxidans; high

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