Study on the composition of resistant organics in winery wastewater and their degradation technique

Abstract

Winery wastewater contains a large number of resistant organic compounds, and the residual effluent COD is high after common biological treatment processes, which is hard to meet the increasingly rigorous wastewater discharge standard in China. Two techniques, Fenton oxidation and Fenton oxidation + SBR processes, were applied to treat winery wastewater in this study, and Gas Chromatography (GC) was used to analyze the resistant organic compounds in the effluent. The results indicated that resistant organic compounds in winery wastewater are mainly composed of long chain alkanoic acids, polyphenols, macromolecular esters and alcohols, and the combination treatment of Fenton + SBR process could eliminate COD effectively, and only 0.43% COD left in the effluent compared to the raw winery wastewater. Fenton pre-oxidation not only can oxidize the resistant organics directly, but also can improve the biodegradability of winery wastewater, and the effluent COD meets 60 mg/L standard. The combination of Fenton pre-oxidation and SBR aerobic treatment is the optimal process treating winery wastewater.