A comprehensive treatment method for epichlorohydrin production wastewater

A technology for the production of epichlorohydrin and waste water, which is applied in biological water/sewage treatment, natural water treatment, multi-stage water treatment, etc. It can solve problems such as microbial calcification, increased salt content, and dense sludge to improve treatment efficiency. , The treatment process is simple, and the effect of reducing inhibition

Active Publication Date: 2020-10-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment processes mostly use A / O, SBR and MBR, etc., and the operating pH value is mostly between 7.5-8.5. In the actual operation process, the following problems are prone to occur: (1) The wastewater treatment effect of the biological process section after a period of operation (2) The improvement of sludge settling performance leads to dense sludge and poor sludge treatment effect; (3) High concentration of calcium ions are transformed into calcium carbonate, calcium sulfate and other calcium insoluble substances attached to microorganisms, Causes microbial calcification, reducing the performance of microorganisms in treating wastewater
However, when concentrated sulfuric acid is used for treatment, the sulfate content in the wastewater will increase, and the sulfate concentration can reach 8000-15000mg / L, resulting in an increase in the salt content in the wastewater and increasing the difficulty of biochemical treatment.

Method used

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  • A comprehensive treatment method for epichlorohydrin production wastewater
  • A comprehensive treatment method for epichlorohydrin production wastewater

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preparation example Construction

[0030] The specific process of the preparation method of microbial bacterial agent of the present invention is as follows:

[0031] (1) Inoculate Paracoccus FSTB-2, Microbacterium Kitami FSTB-4 and Pseudomonas stutzeri FSTB-5 on FSTB solid medium for activation respectively; denitrifying Paracoccus DN-3 and A Bacteria SDN-3 were respectively inoculated on the corresponding solid medium for activation; spread evenly and placed in a constant temperature incubator at 35°C for activation;

[0032] (2) Use the inoculation loop to inoculate the colonies of Paracoccus FSTB-2, Kitamibacterium FSTB-4 and Pseudomonas stutzeri FSTB-5 on the plate into the corresponding FSTB liquid medium respectively, and use the inoculation loop to Take the colonies of Paracoccus denitrificans DN-3 and Methylobacterium SDN-3 on the plate and inoculate them in the corresponding liquid medium respectively, and culture them with shaking at 30°C and 150rpm for 48 hours to the logarithmic growth phase to obt...

Embodiment 1

[0038] The water quality of epichlorohydrin production wastewater produced by a chemical plant is: calcium ion concentration 8000mg / L, COD (Cr method, the same below) 2000mg / L, salt content 2.5wt%, pH value 11.

[0039] The water quality of molecular sieve catalyst production wastewater produced by a chemical plant is: COD concentration is 40000mg / L, sulfate radical is 200mg / L, salt content is 2.0wt%, ammonia nitrogen concentration is 2000mg / L, nitrate nitrogen is 100mg / L, organic nitrogen is 8000mg / L, the pH value is 12.0, and the suspended solids concentration is 4000mg / L. Concentrated sulfuric acid is used for pretreatment. The quality of wastewater after treatment is: COD concentration 38000mg / L, sulfate radical 12000mg / L, salt content 3.5wt%, ammonia nitrogen 2000mg / L, nitrate nitrogen 100mg / L, organic nitrogen 3000mg / L , the pH value is 8.5, and the suspended matter is 200mg / L. After sulfuric acid pretreatment, the flocculent substances precipitated in the wastewater a...

Embodiment 2

[0043] The water quality of epichlorohydrin production wastewater produced by a chemical plant is: calcium ion concentration 8000mg / L, COD 2000mg / L, salt content 2.5wt%, pH value 12.

[0044] The water quality of molecular sieve catalyst production wastewater produced by a chemical plant is: COD concentration is 40000mg / L, sulfate radical is 200mg / L, salt content is 2.0wt%, ammonia nitrogen concentration is 2000mg / L, nitrate nitrogen is 100mg / L, organic nitrogen is 8000mg / L, the pH value is 12.0, and the suspended solids concentration is 4000mg / L. Concentrated sulfuric acid is used for pretreatment. The quality of wastewater after treatment is: COD concentration 38000mg / L, sulfate radical 12000mg / L, salt content 3.5wt%, ammonia nitrogen 2000mg / L, nitrate nitrogen 100mg / L, organic nitrogen 3000mg / L , the pH value is 8.5, and the suspended matter is 200mg / L. After sulfuric acid pretreatment, the flocculent substances precipitated in the wastewater are recycled after proper tre...

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Abstract

The invention relates to a comprehensive treatment method of wastewater of epoxy chloropropane production. The method comprises the following steps: (1) pre-treating the wastewater of molecular sieve catalyst production through sulfuric acid; (2) adjusting the concentration of calcium ion in the wastewater of the epoxy chloropropane production through the pre-treated molecular sieve catalyst until the concentration of the calcium ions in the mixed wastewater is less than 2000mg / L, and removing the generated precipitate; (3) diluting the wastewater obtained in step (2) through domestic sewage and / or industrial wastewater; adjusting the pH of the wastewater to be 7.5-9.0, and removing the generated precipitate; (4) performing aerobic biochemical treatment on the diluted wastewater. With the adoption of the method, the calcium ions, sulfate radical, total nitrogen and COD in the wastewater can be efficiently removed; the method has the characteristics of being simple in treatment processes, and good in treatment effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a comprehensive treatment method for epichlorohydrin production wastewater. Background technique [0002] Epichlorohydrin is an important intermediate in organic synthesis, mainly used in the production of fine chemical products such as epoxy resin, synthetic glycerin, and chlorohydrin rubber. The high-temperature chlorination of propylene is a classic method for the industrial production of epichlorohydrin. The sewage generated in the process has the characteristics of large water volume, high salinity, and high calcium ion concentration. It is difficult and expensive to treat alone. At present, relevant enterprises basically adopt biochemical treatment process after mixing with wastewater from other production units, but this often leads to calcium deposition in the biochemical treatment system, which causes the increase of inor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/001C02F1/52C02F1/66C02F3/02C02F3/1205C02F3/1263C02F3/1268C02F3/341C02F9/00C02F2101/10C02F2101/101C02F2101/16C02F2101/163C02F2103/36C02F2301/08
Inventor 郭志华高会杰孙丹凤赵胜楠李宝忠
Owner CHINA PETROLEUM & CHEM CORP
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