Anaerobic biological treatment of EG/PG water-soluble copolymer coupled with down-flow hanging sponge reactor

Water-soluble copolymers such as polyvinylpyrrolidone and polyvinyl alcohol have been widely used detergents, paints, chemical intermediates in many industrial processes, leading to environmental concerns associated with high-volume organic compound wastewater. Therefore, this study, a combined upflow anaerobic sludge blanket (UASB) reactor downflow hanging sponge (DHS) biosystem has applied for the treatment of synthetic water-soluble copolymer Copolymer consisted ethylene glycol propylene total molecular weight 8,500, commonly preferred automobile parts processing factory, were included influent. Overall, whole UASB–DHS system achieved favorable oxygen demand (COD) removal efficiency 86% ± 7%. In more detail, an loading rate 2.12 kg-COD ⋅ m−3⋅ day −1, UASB enhanced biodegradability wastewater, reached COD 61% 16%. Meanwhile, gel permeation chromatography analysis indicated that wastewater was primarily reduced DHS reactor. addition, massive 16S rRNA gene sequencing showed polyethylene-glycol-degrading bacteria Pelobacter sp. predominant granular sludge.