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Epichlorohydrin production wastewater treatment method

A technology for epichlorohydrin and production wastewater, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and other problems to achieve the effect of in-depth processing, improving processing efficiency and reducing inhibition.

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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, the main components in cellulosic ethanol wastewater are lignin and various organic and inorganic salts. The content of protein and other substances cannot meet the requirements of DDGS product indicators, and it is difficult to achieve high-priced recovery (it can only be used as a general fuel). This treatment process will Significantly increases the production cost of cellulosic ethanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The water quality of the epichlorohydrin production wastewater produced by a chemical plant is as follows: the temperature is 70°C, the calcium ion concentration is 8000mg / L, the COD is 2000mg / L, the salt content is 2.5wt%, and the pH value is 10.

[0038] The water quality of cellulosic ethanol production wastewater produced by a chemical plant is: temperature 80°C, COD 100,000 mg / L, sulfate radical 9290 mg / L, salt content 2.0wt%, pH value 4.0.

[0039] Adopt the method of the present invention to process, adopt cellulosic ethanol production waste water to adjust the calcium ion concentration in the epichlorohydrin production waste water, make the calcium ion concentration in the mixed waste water be 2065mg / L, the sulfate ion concentration be 1236mg / L. At the same time, the temperature of the mixed waste water was controlled to be 70°C, and after a certain period of reaction, the precipitate was filtered to remove, the filtration pressure was 0.5MPa, and the filtration ...

Embodiment 2

[0041] The water quality of the epichlorohydrin production wastewater produced by a chemical plant is as follows: the temperature is 70°C, the calcium ion concentration is 8000mg / L, the COD is 2000mg / L, the salt content is 2.5wt%, and the pH value is 11.

[0042] The water quality of cellulosic ethanol production wastewater produced by a chemical plant is: temperature 80°C, COD 100,000 mg / L, sulfate radical 9290 mg / L, salt content 2.0wt%, pH value 4.7.

[0043] Adopt the method of the present invention to process, adopt cellulosic ethanol production waste water to regulate the calcium ion concentration in the epichlorohydrin production waste water, make the calcium ion concentration in the mixed waste water be 50mg / L, the sulfate ion concentration be 125mg / L. At the same time, the temperature of the mixed waste water was controlled to be 70°C, and after a certain period of reaction, the precipitate was filtered to remove, the filtration pressure was 0.5MPa, and the filtration t...

Embodiment 3

[0045] The water quality of the epichlorohydrin production wastewater produced by a chemical plant is as follows: the temperature is 70°C, the calcium ion concentration is 8000mg / L, the COD is 2000mg / L, the salt content is 2.5wt%, and the pH value is 10.

[0046] The water quality of cellulosic ethanol production wastewater produced by a chemical plant is: temperature 80°C, COD 120,000 mg / L, sulfate radical 9290 mg / L, salt content 2.0 wt%, pH value 5.0.

[0047] Adopt the method of the present invention to process, adopt cellulosic ethanol production waste water to regulate the calcium ion concentration in the epichlorohydrin production waste water, make the calcium ion concentration in the mixed waste water be 386mg / L, the sulfate ion concentration be 32mg / L. At the same time, the temperature of the mixed waste water was controlled to be 70°C, and after a certain period of reaction, the precipitate was filtered to remove, the filtration pressure was 0.5MPa, and the filtration ...

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PUM

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Abstract

The invention relates to an epichlorohydrin production wastewater treatment method, which comprises the following steps: (1) concentration of calcium ion in the epichlorohydrin production wastewater is adjusted by the use of cellulosic bioethanol production wastewater until the concentration of calcium ion in the mixed wastewater is lower than 2100 mg / L and concentration of sulfate ion is not higher than 3000 mg / L, and generated precipitates are removed; (2) pH value of the mixed wastewater is adjusted to 7.6-9.0, and temperature is maintained to be greater than 60 DEG C; (3) after a reaction, generated precipitates are removed, and an effluent undergoes anaerobic biotreatment; (4) an anaerobic effluent and epichlorohydrin production wastewater are mixed until concentration of calcium ion is not higher than 4000 mg / L after the mixing, and generated precipitates are removed; and (5) the effluent undergoes aerobic biochemical treatment, and the treated wastewater meets the emission requirement. By adjusting the concentration of calcium ion in the epichlorohydrin production wastewater by the use of cellulosic bioethanol production wastewater and carrying out anaerobic-aerobic treatment on the mixed wastewater, calcium ion and CDD in the epichlorohydrin production wastewater can be efficiently removed. The method of the invention has characteristics of simple treatment technology, good treatment effect and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a 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 inorganic components in activated sludge an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
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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