title: Catalytic performance of functionalized polyurethane foam on the reductive decolorization of Reactive Red K-2G in up-flow anaerobic reactor under saline conditions.
abstract: Soluble anthraquinone compounds including anthraquinone-2-sulfonate (AQS) and anthraquinone-2,6-disulfonate can accelerate anaerobic decolorization of azo dyes. To realize the application of these compounds, the catalytic performance and stability of AQS-modified polyurethane foam (AQS-PUF) for Reactive Red K-2G decolorization were investigated in an up-flow anaerobic bioreactor under saline conditions. The results showed that the optimal influent pH value and hydraulic retention time were 7 and 10 h, respectively, in a continuous-flow bioreactor amended with AQS-PUF (R1). Under the above conditions, R1 (93.8 % color removal) displayed better decolorization performance than the bioreactor amended with PUF (R2, 64 % color removal) in 10 days, when influent K-2G concentration was 50 mg/L. Moreover, compared with R2, R1 could more effectively cope with 50-400 mg/L K-2G and exhibited better stability with over 85 % color removal efficiency within 75 days. Further bacterial community analysis using polymerase chain reaction-denaturing gradient gel electrophoresis showed that AQS-reducing bacteria played an important role in accelerating K-2G decolorization in R1. Extracellular polymeric substances analysis found that biofilm formed on AQS-PUF had very limited negative effects on K-2G decolorization. The catalytic performance of used AQS-PUF only decreased less than 9 % in batch experiments. These findings indicate that AQS-PUF has potential application for the treatment of azo dye-containing wastewater.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhou
authors.forename: Hong
authors.initials: H
authors.lastname: Lu
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Jianan
authors.initials: J
authors.lastname: Li
authors.forename: Jiti
authors.initials: J
authors.lastname: Zhou
authors.forename: Ruofei
authors.initials: R
authors.lastname: Jin
mesh_terms: D000327:Adsorption; D000693:Anaerobiosis; D001483:Base Sequence; D019149:Bioreactors; D002384:Catalysis; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D017931:DNA Primers; D058645:Denaturing Gradient Gel Electrophoresis; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D016133:Polymerase Chain Reaction; D011140:Polyurethanes / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D017931:DNA Primers; D011140:Polyurethanes; D012965:Sodium Chloride