Method for improving activated sludge concentration in alcohol wastewater full-distillage anaerobic digestion process

An activated sludge and anaerobic digestion technology, applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low anaerobic operation efficiency, difficult sludge treatment, and high equipment investment problems, to achieve the effect of reducing emissions, reducing COD content, and achieving obvious economic and social benefits

Active Publication Date: 2010-08-18
TIANJIN UNIV
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Problems solved by technology

However, the traditional anaerobic digestion treatment of alcohol waste mash has the problems of high equipment investment, low anaerobic operation efficiency, unstable operation, difficult sludge treatment, and CO

Method used

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  • Method for improving activated sludge concentration in alcohol wastewater full-distillage anaerobic digestion process
  • Method for improving activated sludge concentration in alcohol wastewater full-distillage anaerobic digestion process

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Embodiment

[0023] Wastewater with a COD concentration of 60,000mg / L from the corn stalk alcohol production process is sent to the primary anaerobic tank 1, which is equipped with a heat exchanger to control the operating temperature of the primary anaerobic tank 1 to 60°C. The primary anaerobic tank 1 is a fully mixed high-temperature anaerobic reactor, and the volume load of wastewater anaerobic operation reaches 8.0kgCOD / m3.d. After anaerobic treatment of wastewater, COD is less than 6000mg / L first-level anaerobic water effluent, and the biogas generated by the first-level anaerobic operation is sent to the biogas storage tank. The methane purity in the biogas is 55%, and the returned activated sludge biogas part Anaerobic digestion increases the biogas production, and the primary anaerobic effluent containing a large amount of sludge discharged from the primary anaerobic tank 1 is sent to the activated sludge separation device 8 .

[0024]In the activated sludge separation device 8, t...

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Abstract

The invention relates to a method for improving activated sludge concentration in the alcohol wastewater full-distillage anaerobic digestion process. Corn, wheat, paddy rice, sweet potato, sugar-cane, cassava, sweet sorghum and plant straw containing cellulose from the alcohol production process serve as raw materials; and full-distillage waste mash produced in the alcohol production process is subjected to processes of two-stage anaerobic, aerobic, anaerobic activated sludge separation, anaerobic activated sludge concentration and recovery, liquid solid separation, dry-distillage combustion and advanced wastewater treatment. Primary anaerobic effluent containing sludge exhausted from a primary anaerobic jar is fed to an activated sludge recovery device. In the activated sludge recovery device, the primary anaerobic effluent passes through screening equipment to obtain an undersized material of the activated sludge-enriched primary anaerobic water and a sludge-enriched oversized material; and the COD concentration of secondary anaerobic effluent is below 500mg through the aerobic operation in an aerobic jar. The aerobic jar effluent is fed to an advanced wastewater treatment device, the COD concentration of the sewage subjected to the advanced treatment can be less than 100mg/L, and the sewage is discharged after reaching the standard.

Description

technical field [0001] The invention relates to a method for increasing the concentration of activated sludge in the anaerobic digestion process of alcohol (also called: ethanol) waste water. The method adopts two-stage anaerobic, anaerobic activated sludge concentration and reuse, and technologies such as drying and burning of sludge to improve the concentration of activated sludge. Reduce the concentration of activated sludge in the anaerobic digestion process of alcohol wastewater, strengthen the anaerobic operation, increase the biogas yield, realize the reduction of anaerobic sludge discharge, and solve the sludge existing in the current alcohol wastewater treatment process The problems of high water content and high treatment cost have solved the key technical bottleneck that restricts the whole waste treatment process of alcohol wastewater to achieve clean production. Background technique [0002] Bioethanol produced from biomass is an important renewable basic raw ma...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/28C02F103/32
CPCY02E50/30
Inventor 张敏华董秀华吕惠生陶敏莉李永辉欧阳胜利钱胜华
Owner TIANJIN UNIV
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