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Method for treating and recycling TBBP (tetrabromobisphenol)-A production wastewater

A technology for producing tetrabromobisphenol and waste water, which is applied in the fields of natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., which can solve the difficulties of chlorobenzene recovery, reduce the process operation cycle, and the difficulty of biological cultivation And other issues

Inactive Publication Date: 2013-12-25
天津长芦汉沽盐场有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The wastewater produced in the production process of tetrabromobisphenol A is a high-concentration and difficult-to-treat wastewater containing a large amount of insoluble and soluble refractory organic matter. Its main organic components include bisphenol A, polybrominated bisphenol A, chlorobenzene, etc., and also contain Sulfuric acid, sodium sulfate, sodium bromide, etc. have the characteristics of complex components and large fluctuations in water quality, which seriously pollute the environment and are difficult to handle
The existing tetrabromobisphenol A wastewater treatment process is to firstly carry out multi-effect distillation to desalinate, and then the mixed water is treated by biological treatment technology. The main defects are: 1. There is no flocculation process in the physical sedimentation process, which leads to poor water quality entering the evaporator , difficult to recover chlorobenzene
2. The existing technology mostly uses two-effect forced circulation high-temperature evaporators, which lead to the sublimation of phenolic substances and block the condensate pipeline under high temperature conditions, reducing the process operation cycle
3. The existing technology lacks an effective process for degrading water-soluble chlorobenzene. Due to the high concentration of chlorobenzene and tetrabromobisphenol A chemical products in the wastewater, the growth of microorganisms is inhibited, and the biological cultivation of the original sewage treatment facilities is difficult, resulting in the inability of the later biochemical treatment. Normal operation, resulting in substandard effluent water quality

Method used

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Embodiment 1

[0017] A method for the treatment and recycling of tetrabromobisphenol A production wastewater, including physical multi-stage sedimentation and flocculation recovery, two-effect high and low temperature evaporation desalination, ozone advanced oxidation and biochemical treatment several main steps, mainly including the following process steps:

[0018] (1) Physical multi-stage sedimentation and flocculation: Tetrabromobisphenol A wastewater is subjected to three-stage sedimentation treatment. The first-stage sedimentation is cooling sedimentation, the second-stage sedimentation is flocculation sedimentation, and the third-stage sedimentation is overflow sedimentation. The physical cooling of the wastewater through the first stage of sedimentation promotes the precipitation of some chlorobenzene and phenolic substances in the wastewater. The precipitated chlorobenzene is recovered by low-temperature flash technology, and the purity of recovered chlorobenzene can reach more than ...

Embodiment 2

[0024] Its concrete operation process is the same as embodiment 1, only the aeration time of feeding ozone in step (4) is changed to 1 hour, and other conditions are all the same as embodiment 1. After aeration with ozone for 1 hour, add ozone and hydrogen peroxide for oxidation. The physical and chemical indicators of the wastewater are: chlorobenzene: 1.41mg / L, COD: 46.03mg / L, PH value: 6.43 (see Table 2 for specific values) .

Embodiment 3

[0026] Its specific operation process is the same as that of Example 1, only the aeration time of feeding ozone in step (4) is changed to 5 hours, and other conditions are all the same as in Example 1. After 5 hours of aeration with ozone, add ozone and hydrogen peroxide for oxidation. The physical and chemical indicators of the wastewater are: chlorobenzene: 0mg / L, COD: 85.04mg / L, PH value: 6.97 (see Table 2 for specific values).

[0027] Table 1: Various indicators of one-effect low-temperature vacuum evaporation

[0028]

[0029] In the table:

[0030] SS: Refers to solid substances suspended in water, including insoluble inorganic substances, organic substances, silt, clay, microorganisms, etc.

[0031] FS: Refers to non-dissolved solids in sewage.

[0032] TS: is the sum of dissolved solids and non-dissolved solids in sewage. It reflects the total concentration of solids in sewage. The analysis of influent and effluent solids can reflect the effect of sewage treatm...

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Abstract

The invention discloses a method for treating and recycling TBBP (tetrabromobisphenol)-A production wastewater, which comprises the main steps of physical multistage settling, flocculation and recovery, two-effect high / low-temperature evaporative desalination, advanced ozone oxidation and biochemical treatment. According to the invention, the removal of harmful hardly-degradable substances in TBBP-A wastewater is realized, the pH value of wastewater subjected to treatment is neutral, the COD (chemical oxygen demand) can be degraded to below 100 mg / L, and chlorobenzene can be completely decomposed by cutting, thereby reaching reuse and discharge standards, and achieving the purposes of the harmless and up-to-standard discharge of wastewater and the recycling of process water.

Description

[0001] Field [0002] The invention relates to a treatment method for industrial wastewater, in particular to a treatment and recycling method for tetrabromobisphenol A production wastewater. Background technique [0003] The wastewater produced in the production process of tetrabromobisphenol A is a high-concentration and difficult-to-treat wastewater containing a large amount of insoluble and soluble refractory organic matter. Its main organic components include bisphenol A, polybrominated bisphenol A, chlorobenzene, etc., and also contain Sulfuric acid, sodium sulfate, sodium bromide, etc. have the characteristics of complex components and large fluctuations in water quality, which seriously pollute the environment and are difficult to deal with. The existing tetrabromobisphenol A wastewater treatment process is to firstly carry out multi-effect distillation to desalinate, and then the mixed water is treated by biological treatment technology. The main defects are: 1. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 舒广文
Owner 天津长芦汉沽盐场有限责任公司
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