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Pretreatment method for cellulosic ethanol waste fermentation broth

A cellulosic ethanol, fermentation waste liquid technology, applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. time, the effect of shortening the operation cycle

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The COD and SS removal rates of this method are 50wt%~60wt% and over 95wt%, respectively, but the concentrations of COD and SS in the influent are 100,000 mg / L and 50,000 mg / L respectively, which are far lower than those of cellulose ethanol production wastewater The concentration of influent water, and the dosage of flocculant is 100-1500mg / L, and the dosage of medicament is relatively large

Method used

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  • Pretreatment method for cellulosic ethanol waste fermentation broth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] After adding cationic polyacrylamide (PAM) to the conditioning tank, plate-and-frame pressure filtration is carried out, and the effluent after pressure filtration enters the electro-flocculation device for treatment. There are 6 electrode plates in the electroflocculation reaction area, the distance between the electrode plates is 40mm, and the immersion area is 165cm 2 . The operating conditions and treatment results are shown in Table 1.

[0029] Table 1 Operating conditions and processing results of each processing unit

[0030] processing unit operating conditions Influent water quality process result Flocculation-Press Filtration Treated water volume=10L, PAM=5.0 mg / L, filtration pressure=0.35 MPa COD=180000mg / L, SS=128000mg / L COD=115000mg / L, SS=1360mg / L, the water content is 75wt% solid product 1.63kg, the filtration time is 23 min Electroflocculation The electrode voltage is 20-22V, the current is 4.12-5.69A, and the wastewater...

Embodiment 2

[0033] The processing conditions are the same as those in Example 1, and the operating conditions and processing results are shown in Table 2.

[0034] Table 2 Operating conditions and processing results of each processing unit

[0035] processing unit operating conditions Influent water quality process result Flocculation-Press Filtration Treated water volume=10L, PAM=0.5mg / L, filtration pressure=0.35MPa COD=180000mg / L, SS=128000mg / L COD=119000mg / L, SS=1730mg / L, the water content is 75wt% solid product 1.52kg, the filtration time is 28min Electroflocculation The electrode voltage was 22-25V, the current was 5.15-7.53 A, and the wastewater residence time was 25 min. COD=119000mg / L, SS=1730mg / L COD=87500mg / L, SS=65mg / L

[0036] Using the treatment method of flocculation-press filtration-electro-flocculation, when the dosage of PAM was 0.5 mg / L, the final removal rates of COD and SS were 51.39 wt% and 99.95 wt%, respectively, and the pret...

Embodiment 3

[0043] The filtrate (COD=85000mg / L, SS=46mg / L) after flocculation-press filtration-electro-flocculation pretreatment in Example 1 was diluted 4 times and then subjected to anaerobic biological treatment, and the C:N:P ratio was 200:5 Add N and P nutrients in the ratio of :1. In the batch experiment, 10 g of domesticated anaerobic flocculent sludge was added to the shake flask, and 1 L of filtrate was changed every 24 hours. The COD of the influent and effluent was measured. between. Granular sludge appeared after 20 days of continuous culture.

[0044] The fermentation waste liquid was filtered and diluted 4 times, and then anaerobic biological treatment was carried out according to the method of Example 2, and the removal rate of COD was between 85wt% and 92wt%. Granular sludge appeared after 37 days of continuous culture.

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Abstract

The invention discloses a pretreatment method for cellulosic ethanol waste fermentation broth. The method comprises a first step of flocculation, a second step of filtration and a third step of electric flocculation. A cationic organic flocculating agent with a concentration of 0.2 to 10 mg / L is added into a regulating reservoir; then filtration is carried out; and a filtrate enters into an electric flocculation device for treatment. The method has the advantages of small pharmaceutical dosage, a wide pollutant removal scope, low energy consumption, reduction in subsequent accumulation of solid matters in an anaerobic reactor, full use of the volume of the reactor and effective reduction in organic load of anaerobic treatment; moreover, the residual flocculating agent exerts a substantial promotion effect on granulation of anaerobic sludge.

Description

technical field [0001] The invention relates to a pretreatment method for cellulosic ethanol fermentation waste liquid, in particular to a solid-liquid separation pretreatment method for cellulosic ethanol fermentation waste liquid. The method is suitable for the pretreatment of fermentation waste liquor produced by fermenting ethanol from various sources of cellulose as raw materials. Background technique [0002] Among various renewable energy sources, biomass energy is an important renewable energy source in the future energy field. Cellulose is the most abundant biomass energy on earth. Therefore, the use of cellulose fermentation to produce ethanol has great development potential and market space. At present, the technology of fermenting fuel ethanol with cellulose as raw material is basically mature. After rectification, fuel ethanol can be obtained, and the produced mash is cellulosic ethanol fermentation waste liquid. [0003] In the production process of cellulos...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/36
Inventor 张蕾郭宏山陈中涛朱卫其他发明人请求不公开姓名
Owner CHINA PETROLEUM & CHEM CORP
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