Complex microbial inoculant used for degrading waste water rich in surfactant and preparation method thereof

Abstract

The invention relates to a complex microbial inoculant used for degrading waste water rich in surfactant. Four strains, including bacillus pumilus, bacillus subtilis, bacillus cereus and bacillus megatherium, are used and are subjected to slant culture, shake-flask culture, seed tank culture, fermentation tank culture, centrifugation and spray drying processing to obtain finished product bacterial powder of each strain. When the complex microbial inoculant is used, four kinds of bacterial powder are regulated and formed according to a ratio between nonionic surfactant and ionic surfactant in the waste water, then, the bacterial powder is put into a facultative tank and an aeration tank of a waste water biodegradation system; each bacterial powder contains a great quantity of active spores, and the active spores can quickly form a commensalism cooperative system; within 30h, the degradation of non-ions can be 90% or above, the degradation of anionic surfactant can be 99% or above, the integral degradation of COD (Chemical Oxygen Demand) in the waste water can be 95% or above, and discharged water can achieve a secondary discharged standard. The complex microbial inoculant is an efficient sewage processing biological enhancement technology without secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of purification of wastewater rich in surfactants, in particular to a composite bacterial agent for degrading wastewater rich in surfactants and a preparation method thereof. Background technique [0002] Surfactant refers to a substance that can significantly change the interface state of the solution system by adding a small amount. It has fixed hydrophilic and lipophilic groups, which can be oriented on the surface of the solution. Its molecular structure has amphiphilicity: one end is hydrophilic Water group, the other end is a hydrophobic group, and the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino group or amine group and its salts, hydroxyl group, amide group, ether bond, etc. can also be used as Polar hydrophilic groups, while hydrophobic groups are often non-polar hydrocarbon chains, such as hydrocarbon chains with more than 8 carbon atoms. W...

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Problems solved by technology

[0004] The influent COD of a sewage treatment station in an enterprise is generally 2000-4000mg / L, and the surfactant is 500-2000mg / L. The typical SBR wastewater treatment process is adopted, and the effluent is required to meet the secondary discharge standard. The water quality has always been in a state of fluctuation, and the content of surfactant in wastewater fluctuates greatly with the different products produced, which will have a great impact on the SBR biological system. When the content of surfactant in wastewater When the surfactant is low, the treatment effect is better. Once the surfactant content in the wastewater is high, there is basically no effect, and the whole system collapses, and it will take a long time to restore the degradation ability

[0005] Biodegradation is a very common and mature technology for sewage treatment at present. It is widely popularized and applied because of its economical efficiency and no secondary pollution. However, conventional biodegradation has no obvious effect on the treatment of wastewater containing surfactants. The reason is that it is difficult for the microorganisms in the biological system to effectively degrade it in a short period of time, and if the bacteria agent that can efficiently degrade the surfactant can be screened out in a targeted manner according to the characteristics of the surfactant wastewater, it will be greatly improved. Wastewater treatment effect

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