Bioutilization of the distillery stillage of different grain species from bioethanol production

Wastewater from bioethanol plants is classified as highly concentrated in terms of organic pollution precisely due to distillery stillage. The main problem the disposal stillage processing liquid phase, volume which up 92% all wastewater a plant. existing treatment technologies plant can be conditionally divided into four types: evaporation, aerobic biological with fodder yeast production, anaerobic biogas combined schemes. aim our work was study method for cleaning grain by anaerobic-aerobic immobilization microorganisms on fibrous carrier. Physicochemical parameters and purified methane mash were determined according generally accepted methods analyzing distilleries. Under conditions, formed stillage, including low molecular weight compounds – methane, carbon dioxide, acids. After first stage treatment, decreased 8-10 times, after it fed post-treatment, carried out immobilized fixed carrier, reduced removal biomass flow water improved performance. chemical oxygen demand (COD) 1st fermentation 1360 mg/dm3 compared initial COD 15800 mg/dm3, ensured purification efficiency 91.4%. biochemical five days (BOD5) 97.5%. stage, 98.2% 99.8% BOD5. values content total phosphorus also almost 20 nitrogen 9 sulfates 5 times. advantages proposed over ones are ability treat any concentration pollutants additional obtaining fuel biogas, used replace natural gas, solving removing zone their fixation