Advanced treatment process and system for cassava-based ethanol wastewater

Abstract

The invention discloses an advanced treatment process for cassava-based ethanol wastewater. Wastewater generated after cassava-based ethanol is subjected to multistage anaerobic digestion to generate methane is sequentially treated in an anaerobic fluidized bed, a membrane bioreactor, an intermediate tank and a nanofiltration device until nanofiltration water is discharged up to the standard. The invention also discloses a treatment system comprises the anaerobic fluidized bed, the membrane bioreactor, the intermediate tank and the nanofiltration device which are connected in sequence.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an advanced treatment process of cassava ethanol wastewater and a special treatment system. Background technique [0002] Fuel ethanol has the characteristics of cleanness and regeneration, which can reduce the emission of carbon monoxide and hydrocarbons in automobile exhaust. It is an important part of renewable energy. important role in increasing income. At present, the national strategic plan for the development of fuel ethanol requires "not to compete with others for food, not to compete with food for land", actively and scientifically develop non-grain fuel ethanol, insist on focusing on non-food, encourage the diversification of raw materials, and become the development trend of fuel ethanol technology. Potato starchy fuel ethanol mainly includes root starchy raw materials such as cassava and sweet potato. Because of its good processing performance, it h...

AI Technical Summary

Problems solved by technology

Potato starchy fuel ethanol mainly includes root starchy raw materials such as cassava and sweet potato. Because of its good processing performance, it has been used as an ideal substitute raw material for large-scale fuel ethanol production. In the production process of potato non-grain starchy fuel ethanol A large amount of acidic, high-temperature and high-concentration organic wastewater is produced, and 11-15 tons of process wastewater can be produced for every 1 ton of fuel ethanol produced. Large, high content of suspended solids and difficult solid-liquid separation, difficult to handle, high processing cost

After this kind of wastewater passes through the fully mixed anaerobic reactor to produce biogas, the tail water still has a high COD concentration and a high viscosity

UASB, IC and other anaerobic reactors are usually used for secondary anaerobic reactors. Currently, circular reactors with a height-to-diameter-depth ratio are used, and the height of the reactor can reach 10-30 meters. Wastewater lifting requires large energy consumption.

Frequent cleaning shortens the effective operating time of the facility and reduces the life of the membrane, which affects the normal operation of the treatment facility and significantly increases the operating cost

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