Alternative biological systems for the treatment of vinasse from wine

摘要

This work studied alternative treatment schemes for the vinasse wastewater from winendistilleries aiming at overcoming the problems caused by the high nitrogen and sulfurnconcentrations. A plexiglas laboratory-scale upflow anaerobic sludge blanket (UASB) reactor ofn20 L volume that was operated at 458C and hydraulic retention time 1 d, was included in all thenexamined systems. System 1 was the conventional UASB reactor, system 2 was the UASB reactornsupplemented with iron. System 3 consisted of the UASB reactor supplemented with iron and anCSTR reactor that operated under the following conditions: Diluted Oxygen 1.2mg/L, HydraulicnRetention Time 1 d, pH 6.7 and Temperature 458C. System 3 aimed at converting ammoniumndirectly to dinitrogen gas under anaerobic conditions but it needed to be preceeded by a firstnpartial nitrification step. All systems had high COD efficiencies over 75%. Ferrous iron additionnapart from enhancing the performance of systems 2 and 3, it was able to retain all sulphurncontent of the wastewater as ferrous sulfide stripping the biogas from hydrogen sulfide. Systemn3 also managed to meet its goal, since it achieved an 86% nitrogen reduction. Conclusively,nsystem 3 seems to be a very promising environmental technology for the treatment of distillerynand winery byproducts, as well as industrial wastewater with high sulfur and nitrogen content.