Method for treating COD(chemical oxygen demand) of high-salinity wastewater by utilizing compound microbial preparation and compound microbial preparation

Abstract

The invention relates to a method for treating the COD(chemical oxygen demand) of high-salinity wastewater by utilizing a compound microbial preparation and the compound microbial preparation. The compound microbial preparation is prepared from the following components in percentage by weight: 15-25% of bacillus licheniformis solid powder, 15-25% of micrococcus lylae solid powder, 15-25% of citrobacter freundii solid powder, 15-25% of bacillus subtilis solid powder and 15-25% of bacillus amyloliquefaciens solid powder. According to the method for treating the COD(chemical oxygen demand) of thehigh-salinity wastewater by utilizing the compound microbial preparation and the compound microbial preparation, the five microorganisms rapidly grow and propagate by utilizing organic matter which is easy to degrade in sewage, and the macromolecular organic matter in the wastewater are rapidly degraded after the microorganisms grow to a certain concentration; bacillus amyloliquefaciens decomposes the chlorine-contained organic matter, so that the toxic effect on microorganisms is reduced, and the COD(chemical oxygen demand) removal rate is increased; and all the components are coordinated with one another and work cooperatively, so that the COD(chemical oxygen demand) of effluent is obviously lowered.

Description

technical field [0001] The invention relates to a method for treating high-salt wastewater COD by using a compound microbial preparation and the compound microbial preparation, which belong to the technical field of high-salt wastewater purification. Background technique [0002] Most of the propylene oxide production in my country adopts the chlorohydrin method, and a large amount of calcium chloride-containing wastewater will be produced in the production process. According to the literature, the propylene oxide wastewater produced by the chlorohydrin method generally has ① high temperature (up to 60-80℃), ②high pH value (pH 10-12), ③high salt (CaCl2 mass fraction is 3.5%-4.0%), ④high SS (solid suspended solids concentration is 0.3%-0.5%), ⑤high COD value (about 2000-3000mg / L) and other characteristics, and contains a large amount of chloride ions, and at the same time, chloropropanol, dichloropropane, dichloroisopropyl ether, chloroacetone and other difficult biodegradable ...

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Problems solved by technology

[0002] Most of the propylene oxide production in my country adopts the chlorohydrin method, and a large amount of calcium chloride-containing wastewater will be produced in the production process. According to the literature, the propylene oxide wastewater produced by the chlorohydrin method generally has ① high temperature (up to 60-80℃), ②high pH value (pH 10-12), ③high salt (CaCl2 mass fraction is 3.5%-4.0%), ④high SS (solid suspended solids concentration is 0.3%-0.5%), ⑤high COD value (about 2000-3000mg/L) and other characteristics, and contains a large amount of chloride ions, and at the same time, chloropropanol, dichloropropane, dichloroisopropyl ether, chloroacetone and other difficult biodegradable organic Chloride, if not handled properly, will cause serious pollution to the environment

[0003] The difficulties in the treatment of this type of wastewater are: in the pretreatment process, the Ca(OH) in

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