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

A technology for complex microorganisms and high-salt wastewater, applied in the direction of microorganism-based methods, biological water/sewage treatment, biochemical equipment and methods, etc., can solve the effects of affecting the effect of biochemical treatment, easy to generate a large amount of sediment, low oxygenation efficiency, etc. problem, to achieve the effect of improving the COD removal rate, reducing the toxic effect of the bacteria, and reducing the risk

Inactive Publication Date: 2018-11-23
BEFAR GROUP CO LTD
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  • Claims
  • Application Information

AI Technical Summary

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 the wastewater 2 easily with CO in the air 2 The reaction produces calcium carbonate crystals, which make the suspended solids in the wastewater exceed the standard after pretreatment. At the same time, a large amount of sediment is easy to form in the water inlet and the regulating tank, and the scaling will affect the effect of subsequent biochemical treatment; the wastewater has high salinity, and the general salt content is as high as 30000- 40000mg / L, resulting in low oxygenation efficiency and high osmotic pressure, which is difficult for ordinary microorganisms to adapt to; it contains a relatively high concentration of organic chlorides, and the structure of organic chlorides is relatively stable, not easy to be destroyed, and has certain toxicity to microorganisms
[0004] There are few reports abroad on the treatment of wastewater produced by the production of propylene oxide by the chlorohydrin method

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A compound microbial preparation for auxiliary treatment of high-salt wastewater COD, comprising 15% solid powder of Bacillus licheniformis, 15% solid powder of Micrococcus lira, 20% solid powder of Citrobacter freundii, and solid powder of Bacillus subtilis by weight percentage Powder 25%, and Bacillus amyloliquefaciens solid powder 25%.

[0045] Wherein, the viable bacterial concentration of above-mentioned bacillus licheniformis solid powder is 5 * 10 10 CFU / g, the live bacteria concentration of Micrococcus lira solid powder is 5×10 8 CFU / g, the live bacteria concentration of Citrobacter freundii solid powder is 5×10 10 CFU / g, the live bacteria concentration of Bacillus subtilis solid powder is 5×10 10 CFU / g, the live bacteria concentration of Bacillus amyloliquefaciens solid powder is 5×10 10 CFU / g.

[0046] The preparation method of above-mentioned composite microbial preparation, the steps are as follows:

[0047] (1) Solid slant culture: Inoculate Bacillus l...

Embodiment 2

[0058] A compound microbial preparation for auxiliary treatment of high-salt wastewater COD, comprising 18% solid powder of Bacillus licheniformis, 18% solid powder of Micrococcus lira, 20% solid powder of Citrobacter freundii, and solid powder of Bacillus subtilis by weight percentage Powder 22%, and Bacillus amyloliquefaciens solid powder 22%.

[0059] Wherein, the viable bacterial concentration of above-mentioned bacillus licheniformis solid powder is 4 * 10 10 CFU / g, the live bacteria concentration of Micrococcus lira solid powder is 5×10 8 CFU / g, the live bacteria concentration of Citrobacter freundii solid powder is 6×10 10 CFU / g, the live bacteria concentration of Bacillus subtilis solid powder is 5×10 10 CFU / g, the live bacterial concentration of Bacillus amyloliquefaciens solid powder is 4×10 10 CFU / g.

[0060] The preparation method of above-mentioned composite microbial preparation, the steps are as follows:

[0061] (1) Solid slant culture: Inoculate Bacillus ...

Embodiment 3

[0072] A kind of composite microbial preparation for auxiliary treatment of high-salt wastewater COD, with embodiment 1, the difference is, by weight percentage, comprises bacillus licheniformis solid powder 20%, micrococcus lira solid powder 21%, Freund's citric acid Bacillus solid powder 16%, Bacillus subtilis solid powder 21%, and Bacillus amyloliquefaciens solid powder 22%.

[0073] Preferably according to the present invention, the viable bacteria concentration of above-mentioned bacillus licheniformis solid powder is 5 * 10 10 CFU / g, the live bacteria concentration of Micrococcus lira solid powder is 6×10 8 CFU / g, the live bacteria concentration of Citrobacter freundii solid powder is 5×10 10 CFU / g, the live bacteria concentration of Bacillus subtilis solid powder is 4×10 10 CFU / g, the live bacteria concentration of Bacillus amyloliquefaciens solid powder is 5×10 10 CFU / g.

[0074] The preparation method of above-mentioned composite microbial preparation, the steps a...

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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 ...

Claims

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Application Information

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IPC IPC(8): C02F3/34C12N1/20C12R1/01C12R1/10C12R1/125C12R1/07C12R1/265
CPCC02F3/34C12N1/20
Inventor 李晓光赵建芳李钊沙蓓蓓吴伟高孝虎
Owner BEFAR GROUP CO LTD
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