Deep treatment reuse method for cellulose ethanol production wastewater

A technology for the production of 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. It can solve the problems of high influent load, decreased biogas generation rate, and anaerobic treatment of wastewater Ineffectiveness and other problems, to achieve water-saving sewage discharge, reduce sewage discharge, and low operating costs

Active Publication Date: 2014-04-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the specific analysis of the cellulosic ethanol production process, the use of this single sewage treatment process cannot meet the requirements of sewage treatment and discharge standards
First of all, the COD content of wastewater is as high as 130,000 mg / L. A single anaerobic fermentation process cannot completely remove biological toxic substances such as carboxylic acid, furfural, furan, and phenol in wastewater, which may easily cause overload of subsequent aerobic treatment influent. High, the treated effluent cannot be directly discharged up to the standard
Secondly, the pH of the wastewater is about 4.0, and the content of sulfate radicals is as high as 10,000 mg / L, which has greatly exceeded the required value of less than 5000 mg / L in the anaerobic fermentation treatment process. Oxygen bacteria reduce to high concentration of hydrogen sulfide, which seriously inhibits the methanation and fermentation process of high concentration organic matter, resulting in a sharp decline in biogas production rate, resulting in the failure of anaerobic treatment of wastewater
[0011]Based on the above analysis, the present invention believes that for the production process of cellulosic ethanol with a relatively complicated production process, a single anaerobic fermentation or anaerobic fermentation-aerobic biochemical wastewater treatment The process cannot meet the requirements of wastewater discharge standards

Method used

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  • Deep treatment reuse method for cellulose ethanol production wastewater

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Experimental program
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Effect test

Embodiment 1

[0038] 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 adopts 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. The specific operating conditions and structures are shown in Table 1.

[0039] Table 1 The composition and treatment effect of the main processing units in Example 1.

[0040] Handling unit name Processing device scale and main components Main operating conditions and control parameters Treatment effluent or effect Neutra...

Embodiment 2

[0042] Using the treatment device of Example 1 to treat the same sewage as in Example 1, and changing the operating conditions of each treatment unit, the wastewater treatment effect obtained is shown in Table 2.

[0043] Table 2 The composition and treatment effect of the main processing units in Example 2.

[0044] Handling unit name Processing device scale and main components Main operating conditions and control parameters Treatment effluent or effect Neutralize precipitation The neutralization sedimentation tank is made of plexiglass, 20L, with a processing capacity of 10L / h, with Ca(OH) 2 On-line adding system and stirring device, the sediment is discharged regularly, and the discharge cycle is 24 hours. Continuous operation, water inflow 2 L / h, Ca(OH) 2 The mass fraction is 5%. The COD of the effluent is about 120,000 mg / L, and the pH is 6.5. Dissolved air flotation Pressurized dissolved air flotation device with a processing capacity...

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Abstract

The present invention relates to a deep treatment reuse method for cellulose ethanol production wastewater. The method mainly comprises three systems, wherein a pretreatment system adopts processes such as neutralization precipitation, gas dissolution gas flotation and cooling, a biological treatment system adopts a two stage anaerobic biological treatment and aerobic SBR, a deep treatment adopts a combination process, the combination process comprises electrolytic catalysis oxidation, a membrane bioreactor treatment, an ultrafiltration-reverse osmosis treatment and the like, and the effluent treated by the processes is completely adopted as water for cellulose ethanol production to be recycled so as to achieve purposes of water saving and emission reducing of cellulose ethanol production.

Description

technical field [0001] The invention relates to a treatment method of fiber ethanol wastewater, which is used for the treatment and reuse of wastewater produced from ethanol by using plant fibers such as corn stalks and sorghum stalks as raw materials. Background technique [0002] The global energy shortage and the non-renewability of fossil fuels should make the development of renewable energy technology highly valued. Among various renewable energy technologies, biomass energy is an important renewable energy in the future energy field, and as a renewable energy that can be converted into liquid fuel, it is being paid more and more attention. [0003] Hydrolyzing and fermenting plant fibers such as corn stalks and sorghum stalks to produce fuel ethanol is one of the methods for effectively utilizing biomass energy, and it has greater practical and strategic significance to our country. The development and utilization of cellulose waste to produce fuel ethanol is of great...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 张蕾郭宏山朱卫
Owner CHINA PETROLEUM & CHEM CORP
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