title: High efficiency removal of 2-chlorophenol from drinking water by a hydrogen-based polyvinyl chloride membrane biofilm reactor.
abstract: A continuously stirred hydrogen-based membrane biofilm reactor (MBfR) with polyvinyl chloride (PVC) hollow fiber membrane was investigated for removing 2-chlorophenol (2-CP) from contaminated drinking water. The bioreactor startup was achieved by acclimating the microorganisms from a denitrifying and sulfate-reducing MBfR to the drinking water contaminated by 2-CP. The effects of some major factors, including 2-CP loading, H(2) pressure, nitrate loading, and sulfate loading, on the removal of 2-CP by the MBfR were systematically investigated. Although the effluent 2-CP concentration increased with its increasing influent loading, the removing efficiency of 2-CP by the MBfR could be up to 94.7% under a high influent loading (25.71 mg/L d). The removing efficiency of 2-CP by the MBfR could be improved by higher H(2) pressure, and lower influent nitrate concentration and sulfate concentration. A high H(2) pressure can assure enough available H(2) as the electron donor for 2-CP degradation. The competition in the electron donor made nitrate and sulfate inhibit the degradation of 2-CP in the MBfR. The electron flux analyses indicated that the degradation of 2-CP only accounted for a small part of electron flux, and the autohydrogenotrophic bacteria in the MBfR were highly efficient for the 2-CP removal.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Siqing
authors.initials: S
authors.lastname: Xia
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Fohua
authors.initials: F
authors.lastname: Zhong
authors.forename: Jiao
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D018441:Biofilms; D002733:Chlorophenols / Q000302:isolation & purification*; D006859:Hydrogen / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011312:Pressure; D012996:Solutions; D013431:Sulfates / Q000737:chemistry; D018508:Water Purification; D014881:Water Supply / Q000032:analysis*
chemical_list: D002733:Chlorophenols; D009566:Nitrates; D012996:Solutions; D013431:Sulfates; D006859:Hydrogen; D011143:Polyvinyl Chloride; C030683:2-chlorophenol