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Method for treating fiber ethanol production wastewater

A technology for producing wastewater and cellulosic ethanol, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The influence of the system, the processing technology is simple, and the processing effect is good.

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

Evaporation can be used to treat high-salt wastewater, but the amount of wastewater generated during the production of epichlorohydrin is large, and the cost of pretreatment of wastewater by evaporation is high, and enterprises cannot afford it.
Membrane treatment technology is used abroad to treat wastewater containing calcium chloride from propylene oxide production, but its use is limited due to high cost
For wastewater with high concentration of calcium ions, carbonate is usually used to remove calcium ions in advance, not only the removal of calcium ions is limited, but also the cost is high, the salt content of wastewater after treatment cannot be effectively reduced, and it is still not possible to directly use biochemical methods to efficiently deal with

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 described in the present invention to carry out treatment, adopt epichlorohydrin production waste water to adjust the sulfate radical concentration in the cellulosic ethanol production waste water, make the sulfate radical concentration in the waste water after mixing be 65mg / L. At the same time, the temperature of the mixed wastewater was controlled to be 70°C. After a certain period of reaction, the precipitate was removed by filtration, the filtration pressure was 0.5MPa, and the filtration time was 1...

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 described in the present invention to carry out treatment, adopt epichlorohydrin production waste water to adjust the sulfate radical concentration in the cellulosic ethanol production waste water, make the sulfate radical concentration in the waste water after mixing be 2950mg / L. At the same time, the temperature of the mixed wastewater was controlled to be 70°C. After a certain period of reaction, the precipitate was removed by filtration, the filtration pressure was 0.5MPa, and the filtration time was...

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 described in the present invention to carry out treatment, adopt epichlorohydrin production waste water to adjust the sulfate radical concentration in the cellulosic ethanol production waste water, make the sulfate radical concentration in the waste water after mixing be 150mg / L. At the same time, the temperature of the mixed wastewater was controlled to be 70°C. After a certain period of reaction, the precipitate was removed by filtration, the filtration pressure was 0.5MPa, and the filtration time was...

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Abstract

The invention relates to a method for treating fiber ethanol production wastewater. The method comprises the following steps: (1) adjusting the concentration of a sulfate radical in fiber ethanol production wastewater with epoxy chloropropane production wastewater so as to control the content of the sulfate radical in mixed wastewater to be within 3000 mg / L, and removing precipitates; (2) adjusting the pH value of the mixed wastewater to be 7.6-9.0, and keeping the temperature of the mixed wastewater to be higher than 60 DEG C; (3) after the reaction is completed, removing the precipitates, and performing anaerobic biochemical treatment on effluent; and (4) performing aerobiotic biochemical treatment on anaerobic effluent, thereby enabling treated wastewater to meet emission requirements. According to the method, the concentration of the sulfate radical in the fiber ethanol production wastewater is adjusted with the epoxy chloropropane production wastewater, and the mixed wastewater is treated by using anaerobic-aerobiotic processes, so that efficient removal of the sulfate radical and COD (Chemical Oxygen Demand) in the wastewater can be achieved, and the method has the characteristics of being simple in treatment process, good in treatment effect and the like.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for waste water from cellulosic ethanol production. [0002] technical background [0003] Cellulosic ethanol is usually made of plant fibers such as corn stalks and sorghum stalks, and high-purity ethanol is obtained through steam-explosion pretreatment, cellulase hydrolysis, glucoamylase fermentation, ethanol rectification, and dehydration. In its production process, a large amount of cellulosic ethanol production wastewater will be produced. The main source of the waste water is the fermentation mash of the ethanol distillation tower, and its main characteristics are: high insoluble solids, about 5%; high temperature, about 95°C; large chroma; waste water is acidic waste water; COD about 10-13 Ten thousand mg / L, mainly soluble xylose, glycerin, acetic acid, volatile phenol, lactic acid, lignin, furfural and various fermentation inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/36
Inventor 郭志华高会杰孙丹凤赵胜楠李宝忠郭宏山
Owner CHINA PETROLEUM & CHEM CORP
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