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A kind of treatment method of cellulosic 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: 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

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: temperature is 70℃, calcium ion concentration is 8000mg / L, COD is 2000mg / L, salt content is 2.5wt%, and pH value is 10.

[0038] 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 4.0.

[0039] The method of the present invention is adopted for treatment, and the sulfate radical concentration in the fiber ethanol production waste water is adjusted by using the epichlorohydrin production wastewater to make the sulfate radical concentration in the mixed waste water 65 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 wastewater is detected to be 6.5, 10...

Embodiment 2

[0041] 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 value 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 adopted for treatment, and the sulfate radical concentration in the fiber ethanol production wastewater is adjusted by using the epichlorohydrin production wastewater to make the sulfate radical concentration in the mixed wastewater 2950 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 wastewater is detected to...

Embodiment 3

[0045] 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 value 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 adopted for treatment, and the sulfate radical concentration in the fiber ethanol production waste water is adjusted by using the epichlorohydrin production wastewater to make the sulfate radical concentration in the mixed waste water 150 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 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 wastewater treatment, and specifically relates to a method for treating wastewater from fiber ethanol production. [0002] technical background [0003] Cellulose ethanol is usually made of plant fibers such as corn stalks and sorghum stalks as raw materials, and high-purity ethanol is obtained through processes such as steam explosion pretreatment, cellozyme hydrolysis, saccharification enzyme fermentation, ethanol rectification and dehydration. During its production process, a large amount of waste water from the production of fiber ethanol will be produced. The main source of this waste water is the fermentation mash from the ethanol distillation tower. Its main characteristics are: high insoluble solids, about 5%; high temperature, about 95°C; high chroma; wastewater is acidic wastewater; COD is about 10-13 Ten thousand mg / L, mainly soluble xylose, glycerin, acetic acid, volatile phenol, lactic acid, lignin...

Claims

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Application Information

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Patent Type & Authority Patents(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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