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A kind of treatment method of epichlorohydrin production waste water

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 deep processing, reducing inhibition and improving processing efficiency

Active Publication Date: 2020-10-16
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: temperature is 70℃, calcium ion concentration is 8000mg / L, COD is 2000mg / L, salt content is 2.5wt%, and pH is 10.

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

[0039] The method of the present invention is adopted for treatment, and the concentration of calcium ions in the wastewater from the production of epichlorohydrin is adjusted by the wastewater from the production of fiber ethanol, so that the concentration of calcium ions in the mixed wastewater is 2065 mg / L and the concentration of sulfate ions is 1236 mg / L. At the same time, the temperature of the mixed wastewater is controlled to 70°C, after a certain period of reaction, the precipitate is removed by filtration, the filtration pressure is 0.5MPa, ...

Embodiment 2

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

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

[0043] The method of the present invention is used for treatment, and the fiber ethanol production wastewater is used to adjust the calcium ion concentration in the epichlorohydrin production wastewater, so that the calcium ion concentration in the mixed wastewater is 50 mg / L and the sulfate ion concentration is 125 mg / L. At the same time, the temperature of the mixed wastewater is controlled to 70°C, after a certain period of reaction, the precipitate is removed by filtration, the filtration pressure is 0.5MPa, and the filtration time is 120min. Then the pH of the mixed wastewat...

Embodiment 3

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

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

[0047] The method of the present invention is used for processing, and the fiber ethanol production wastewater is used to adjust the calcium ion concentration in the epichlorohydrin production wastewater, so that the calcium ion concentration in the mixed wastewater is 386 mg / L and the sulfate ion concentration is 32 mg / L. At the same time, the temperature of the mixed wastewater is controlled to 70°C, after a certain period of reaction, the precipitate is removed by filtration, the filtration pressure is 0.5MPa, and the filtration time i...

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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 specifically relates to a method for treating epichlorohydrin production wastewater. Background technique [0002] Epichlorohydrin is an important organic synthesis intermediate, mainly used to produce epoxy resin, synthetic glycerin, chlorohydrin rubber and other fine chemical products. Propylene high-temperature chlorination is a classic method for industrial production of epichlorohydrin. The sewage produced during the process has the characteristics of large water volume, high salinity, and high calcium ion concentration, which makes it difficult and expensive to treat separately. At present, relevant companies basically adopt the biochemical treatment process after mixing with the wastewater of other production facilities, but it often leads to calcium deposits in the biochemical treatment system, causing the increase of inorganic components in the activated sludge and the deteri...

Claims

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Application Information

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Patent Type & Authority Patents(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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