Comprehensive treatment and utilization method of cassava distiller's grain wastewater and industrial sludge

Abstract

The invention provides a method for comprehensively treating and utilizing cassava vinasse waste water and industrial sludge. The method includes: pumping original cassava vinasse waste water into an anaerobic fermentation tank to perform whole-tank high-temperature anaerobic treatment so as to produce biogas; concentrating sludge discharged by the anaerobic fermentation tank, then delivering into a plate-and-frame filter press, and filtering with the plate-and-frame filter press to obtain anaerobic sludge and filtered clear liquid; using a precision filter to perform multistage purification on the filtered clear liquid to obtain first-level plain water and concentrated discharge water, processing the first-level plain water with a membrane biological processing device to obtain second-level plain water which can reach the indexes of production water, and recycling the plain water; mixing the obtained concentrated discharge water and anaerobic sludge with other industrial sludge, dewatering with a dewatering machine, and then conveying to a pyrolyzing furnace for pyrolysis so as to produce combustible gas. The method has the advantages that after the cassava vinasse waste water is subjected to anaerobic fermentation to produce the biogas, self-balancing of energy production and power consumption can be achieved, the water produced after the treatment by the precision filter and a membrane biological reactor can be recycled, resource utilization is achieved, and production cost is lowered.

Description

technical field [0001] The invention relates to a comprehensive treatment and utilization method of cassava distiller's grain waste water and industrial sludge, and belongs to the technical field of waste water and sludge treatment methods. Background technique [0002] The alcohol industry is an important industry in the development of the national economy. In the process of producing alcohol, a large amount of distiller's grains waste liquid, which is a typical high-concentration organic wastewater, is usually treated by anaerobic-aerobic biological treatment. However, the cassava distiller's grains wastewater has the following problems: the cassava raw material has high fiber content and contains viscous components; the pH value is acidic, which is not suitable for the survival of anaerobic bacteria. High, the suspended solids content is as high as 30000-50000mg / L, and the use of anaerobic UASB and other processes requires the influent suspended solids concentration to be...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a comprehensive treatment and utilization method of cassava distiller's grain wastewater and industrial sludge, so as to solve the problem of insufficient existing technology

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