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Method for hydraulic dehydration and anaerobic fermentation to treat sludge from urban domestic sewage treatment plants

A technology of urban domestic sewage and anaerobic fermentation, which is applied in the field of resource treatment of sludge in urban domestic sewage treatment plants, can solve the problems of not mentioning the dehydration effect of the device, and achieve the reduction of external energy dependence, a wide range of sources, and combustion calorific value. big effect

Active Publication Date: 2017-01-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1995, U.S. Patent US005386768 reported that using hydraulic pressure as the driving force to dewater sludge could achieve continuous operation, but did not mention the dehydration effect of the device

Method used

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  • Method for hydraulic dehydration and anaerobic fermentation to treat sludge from urban domestic sewage treatment plants
  • Method for hydraulic dehydration and anaerobic fermentation to treat sludge from urban domestic sewage treatment plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The first stage—hydraulic deep dehydration stage: Weigh 55g of sludge (water content about 80%), 1.2g of CaO, and 12.5mL of deionized water, mix them evenly, and wrap them with 80-100 mesh nylon filter cloth. The hydraulic pipe pressure is 5.0Mpa, and the sludge is dehydrated. The water content of the obtained dewatered sludge is 58%, the press filtrate pH7.12, COD4563mg / L, NH 4 + -N52mg / L.

[0059] The second stage—the anaerobic fermentation hydrogen production stage using the press-filtrate as the substrate: add 0.2% (based on the quality of the press-filtrate) iron powder, then add 0.2g / L-press-filtrate BESA, and let it stand for 24 hours. The fermentation temperature is 37±1°C, and the HRT is 3 days. The obtained hydrogen production rate was 585mL / (L·d), the effluent pH was 6.92, the COD was 1354mg / L, the COD removal rate was 70.3%, and the NH 4 + -N is 9mg / L, NH 4 + -N removal rate was 82.7%.

Embodiment 2

[0061] The first stage—hydraulic deep dehydration stage: Weigh 50g of sludge (moisture content about 80%), CaO0.8g, deionized water 12.5mL, mix well, and wrap with 80-100 mesh nylon filter cloth. The hydraulic pipe pressure is 4.5MPa, and the sludge is dehydrated. The water content of the obtained dewatered sludge is 53%, the press filtrate pH7.05, COD4468mg / L, NH 4 + -N48mg / L.

[0062] The second stage—the anaerobic fermentation hydrogen production stage using the press-filtrate as the substrate: add 0.2% (based on the quality of the press-filtrate) iron powder, then add 0.2g / L-press-filtrate BESA, and let it stand for 24 hours. The fermentation temperature is 37±1°C, and the HRT is 3 days. The obtained hydrogen production rate was 570mL / (L·d), the effluent pH was 6.87, the COD was 1254mg / L, the COD removal rate was 71.9%, and the NH 4 + -N11mg / L, NH 4 + -N removal rate was 77.1%.

Embodiment 3

[0064] The first stage—hydraulic deep dehydration stage: Weigh 50g of sludge (moisture content about 80%), CaO 1.0g, and deionized water 12.5mL, mix well, and wrap with 80-100 mesh nylon filter cloth. The hydraulic pipe pressure is 5.5MPa, and the sludge is dehydrated. The moisture content of the obtained dewatered sludge is 49%, the press filtrate pH7.17, COD4863mg / L, NH 4 + -N56mg / L.

[0065] The second stage—the anaerobic fermentation hydrogen production stage using the press-filtrate as the substrate: add 0.2% (based on the quality of the press-filtrate) iron powder, then add 0.2g / L-press-filtrate BESA, and let it stand for 24 hours. The fermentation temperature is 37±1°C, and the HRT is 3 days. The obtained hydrogen production rate was 614mL / (L·d), the pH of the effluent was 6.95, the COD was 1396mg / L, the COD removal rate was 71.3%, and the NH 4 + -N13mg / L, NH 4 + -N removal rate was 76.8%.

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Abstract

The invention combines hydraulic deep dehydration with anaerobic fermentation hydrogen production method to process traditional mechanical dewatered sludge in urban domestic sewage treatment plants as resources. In the first stage, the sludge moisture content can be reduced to less than 60% by adding the regulator CaO to assist the hydraulic method in deep dehydration of the sludge. In the second stage, the press filter liquid obtained in the first stage is used as the substrate for anaerobic fermentation to produce hydrogen, and the reaction system is optimized by adding zero-valent iron powder, which can reduce the oxidation-reduction potential of the system, maintain a neutral pH, and provide The iron element required by hydrogenase in hydrogen microorganisms, thereby increasing the hydrogen production rate and COD degradation rate of the anaerobic fermentation reaction system.

Description

technical field [0001] The invention relates to a resource-based treatment method for sludge from an urban domestic sewage treatment plant. The press-filtrate obtained after hydraulic deep dehydration is different from that of influent water, and the press-filtrate is used as the substrate of anaerobic fermentation for hydrogen production. . The anaerobic fermentation process is optimized by adding zero-valent iron to promote the degradation of organic matter and increase hydrogen production. It belongs to the technical field of sludge treatment. Background technique [0002] At present, the wastewater treatment method mainly used in urban domestic sewage treatment plants is the activated sludge method, which will produce a large amount of excess sludge. With the increase in the amount of sewage treatment and the improvement of discharge standards, sludge treatment methods are also being continuously improved to meet the requirements of reduction, stabilization, harmlessne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/12C12P3/00
CPCY02E50/30Y02W10/20
Inventor 孙承林余丽于杨蒋文天卫皇曌于永辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI