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Anaerobic bio-enhancement treatment method for cellulose ethanol wastewater

A cellulosic ethanol and anaerobic biological technology, which is applied in the field of anaerobic biological enhancement treatment, can solve the problems of high-concentration salt-containing organic wastewater treatment, no economically feasible treatment method, and increase the production cost of cellulosic ethanol. The effect of subsequent biochemical treatment, small investment, and difficulty reduction

Active Publication Date: 2014-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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
[0005] Based on the above analysis, although the production of cellulosic ethanol using the acidic steam-explosion pretreatment process has great advantages in technology and economy, it also brings about a relatively large problem of high-concentration salt-containing organic wastewater treatment, and there is currently no economic Feasible treatment

Method used

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  • Anaerobic bio-enhancement treatment method for cellulose ethanol wastewater

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Effect test

Embodiment 1

[0030] 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 main characteristics of the wastewater are: COD 129050 mg / L (chromium method, the same below), sulfate radical 9290 mg / L, inorganic salt 2.0%, pH 4.0.

[0031] The two-stage anaerobic enhanced microbial treatment process of the present invention was used to carry out laboratory treatment tests on the above wastewater. The wastewater treatment scale was 200 mL / h. The main experimental device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 1. After being treated by the method of the present invention, the COD in the cellulosic ethanol wastewater can be reduced to less than 2000 mg / L, the amount of inorganic salts can be reduced to 1.0%, and the sulfate radical can be reduced to 10 mg / L, which greatly reduces the technical difficulty of subsequent wastewater treatment...

Embodiment 2

[0036] 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.

[0037] Table 2 The composition and treatment effect of the main processing units in Example 2.

[0038] Handling unit name Processing device scale and main components Main operating conditions and control parameters Inlet, outflow or treatment effect 1 The first anaerobic tank The contact process is adopted, the material is plexiglass, and the reactor volume is 100L. It mainly includes gas collecting hood, pool cover, pool body, feeding pipe, discharging pipe, mixing equipment and so on. The lower part continuously feeds water; the feed water is 200 mL / h of fiber ethanol raw water, and 800 mL / h of sludge liquid in sewage sedimentation tank; the total residence time of wastewater is 4.2 days; the volume load of feed water is 6.7 kgCOD / m ...

Embodiment 3

[0041] 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 3.

[0042] Table 3 Main processing unit configuration and processing effect of Example 3.

[0043] Handling unit name Processing device scale and main components Main operating conditions and control parameters Inlet, outflow or treatment effect 1 The first anaerobic tank The contact process is adopted, the material is plexiglass, and the reactor volume is 100L. It mainly includes gas collecting hood, pool cover, pool body, feeding pipe, discharging pipe, mixing equipment and so on. The lower part continuously feeds water; the feed water is 200 mL / h of cellulosic ethanol raw water, and 400 mL / h of sludge liquid in sewage sedimentation tank; the total residence time of wastewater is 6.9 days; the volume load of feed water is 6.6 kgCOD / m 3 ...

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Abstract

The present invention relates to an anaerobic bio-enhancement treatment method for cellulose ethanol wastewater, wherein the method is used for treatment of high concentration salt-containing organic wastewater during an ethanol production process adopting corn straws and other plant fiber as raw materials. According to the method, a two stage anaerobic treatment process is performed on cellulose ethanol wastewater, wherein a salt-resistant dominant strain is regularly poured into a first stage anaerobic tank to carry out bio-enhancement so as to reduce sulfates in the wastewater into hydrogen sulfide gas, and a sludge reflux manner is adopted to adjust concentrations of inorganic salts and pollutants in the influent so as to meet requirements of the anaerobic biological treatment process, such that high concentration organic matters in the wastewater are converted into biogas so as to reduce inorganic salt content in the wastewater and easily achieve the follow-up biochemistry treatment purpose. In addition, the method has advantages of low investment and low operation cost.

Description

technical field [0001] The invention relates to an anaerobic biointensified treatment method for fiber ethanol wastewater, which is used for the treatment of high-concentration salt-containing organic wastewater in the process of producing ethanol with plant fibers such as corn stalks as raw materials. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
CPCY02E50/30
Inventor 郭宏山陈中涛张蕾朱卫
Owner CHINA PETROLEUM & CHEM CORP
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