title: Performance robustness of the UASB reactors treating saline phenolic wastewater and analysis of microbial community structure.
abstract: Anaerobic digestion was an important way to remove phenols from saline wastewater; however the anaerobic microorganisms were adversely affected by high concentration of salts. In order to clarify the performance robustness and microbial community structure for anaerobic digestion of saline phenolic wastewater, the UASB reactors were compared to treat phenolic wastewater under saline and non-saline conditions. The saline reactors were operated stably with phenols concentration increasing from 100 to 500mgL-1at 10g Na+L-1. The robustness of the saline reactors was weakened at 1000mg phenols L-1and 10g Na+L-1. However, the substrate utilization rates (SURs) for phenol, catechol, resorcinol, hydroquinone, and the specific methanogenic activity (SMA) of sludge were decreased by 95%, 85%, 97%, 78%, and 68%, respectively with phenols concentration enhancing from 1000 to 2000mgL-1. Moreover, the SURs for phenol, catechol, resorcinol, hydroquinone, and the SMA of sludge were reduced by 32%, 65%, 74%, 45%, and 59%, respectively with Na+concentration increasing from 10 to 20gL-1, in comparison with the values obtained at 10g Na+L-1and 1000mg phenols L-1. Finally, the analysis of microbial community structure demonstrated that phenols degraders were less tolerant to high concentrations of Na+and phenols than methanogens.
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: dwhit@126.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Benteng
authors.initials: B
authors.lastname: Wu
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Shanglei
authors.initials: S
authors.lastname: Pan
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China. Electronic address: zhhu@hfut.edu.cn.
authors.forename: Zhenhu
authors.initials: Z
authors.lastname: Hu
authors.affiliation: Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China.
authors.forename: Shoujun
authors.initials: S
authors.lastname: Yuan
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D059013:Microbial Consortia / Q000187:drug effects*; D010636:Phenols / Q000302:isolation & purification / Q000633:toxicity*; D054712:Salinity; D018508:Water Purification / Q000379:methods*
chemical_list: D010636:Phenols
keywords: Anaerobic digestion; Microbial community structure; Performance robustness; Phenolic wastewater; Saline wastewater