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Treatment method for wastewater generated in cellulosic ethanol production

A technology of cellulosic ethanol and its treatment method, which is applied in the field of cellulosic ethanol wastewater treatment, can solve problems such as environmental protection constraints, and achieve the effect of saving water and reducing sewage discharge

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is no suitable relevant wastewater treatment technology at present, the wide application of the cellulosic ethanol production process of the acidic steam-explosion pretreatment route will undoubtedly cause huge environmental constraints

Method used

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  • Treatment method for wastewater generated in cellulosic ethanol production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The treatment method of the present invention is used to treat the waste water of a domestic medium-scale test-scale cellulosic ethanol production plant. The device uses corn stalks as raw materials, and mainly uses steam acid explosion pretreatment, enzymatic hydrolysis, sugar solution fermentation, ethanol concentration and rectification purification to produce cellulosic ethanol. The main pollutant COD in wastewater is 129050 mg / L ( Chromium method, the same below), BOD 5 68600 mg / L, sulfate radical 9290 mg / L, total salt content 9.69%, ammonia nitrogen 38.8 mg / L, carboxylic acid 4600 mg / L, furan 230 mg / L, phenol 600 mg / L.

[0029] Adopt the pressure filtration-multi-effect evaporation-cooling-anaerobic fermentation-aerobic biology-filtration combined treatment of the present invention to carry out laboratory treatment test to above-mentioned waste water, the scale of waste water treatment is 200 mL / h, the main experimental device constitution of each treatment unit ...

Embodiment 2

[0034] The treatment device of Example 1 was used to treat the same sewage as in Example 1, and the wastewater treatment effects obtained by changing the operating conditions of each treatment unit are shown in Table 2.

[0035] Table 2 Main processing unit composition and processing effect of embodiment 2

[0036] Handling unit name Processing device scale and main components Main operating conditions and control parameters Treatment effluent or effect 1 filter press Filter, processing capacity 10L / h Intermittent operation, vacuuming, membrane filtration; add 50mg / L polyferric sulfate flocculant to the wastewater before pressing and stirring and coagulating for 3 minutes Effluent COD105,000 mg / L; filter residue moisture content 75% 2 Multi-effect evaporation Falling film five-effect evaporation test device, made of glass. The wastewater treatment scale of the device is 5L / h, mainly including evaporation column, preheater, condenser and enamel ...

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Abstract

The present invention relates to a treatment method for wastewater generated in cellulosic ethanol production. The method is used for treatment and reuse of wastewater generated by using corn stalks and other plant fibers as raw materials for ethanol production, and especially for salt-containing organic wastewater. A combined process of filter pressing - multi-effect evaporation - cooling - anaerobic fermentation - aerobic biotreatment - filtration is used for treating the wastewater generated in the cellulosic ethanol production. The water flowed out after the treatment can be directly reused in the processes such as acid liquor preparation, hydrolysis and fermentation of the cellulosic ethanol production, so purposes of saving water and zero liquid discharge in the cellulosic ethanol production are reached. The method of the present invention is characterized in that recycling of all the high salt concentration wastewater can be achieved, effective recovery and comprehensive utilization of waste materials in the wastewater is obtained, high concentration organic pollutants are converted into methane and the like for resource utilization, and requirements of circular economy, clean production and the like are met.

Description

technical field [0001] The invention relates to a treatment method of fiber ethanol waste water, which is used for the treatment and reuse of waste water produced from ethanol by using plant fibers such as corn stalks as raw materials, especially organic waste water containing salt. Background technique [0002] With the increasing shortage of global fossil energy, the aggravation of environmental pollution, the general requirements of circular economy and carbon emission reduction, the development of renewable energy has become the theme of this era, and the production of plant fibers such as corn stalks and sorghum stalks Cellulose ethanol is one of the important ways to develop renewable energy. [0003] Cellulosic ethanol is usually made of plant fibers such as corn stalks and sorghum stalks. High-purity ethanol is obtained through steam-explosion pretreatment, cellulase hydrolysis, glucoamylase fermentation, ethanol rectification and dehydration, and mixed into gasoline...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/04C02F103/36
CPCY02W10/10
Inventor 郭宏山刘淑鹤朱卫
Owner CHINA PETROLEUM & CHEM CORP
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