title: The effects of preozonation on the biodegradability of mixed phenolic solution using a new gas-inducing reactor.
abstract: In this study, the effects of preozonation on the biodegradability of mixed 2-chlorophenol/4-cresol solution were investigated using a new gas-inducing reactor, which can provide high ozone utilization efficiency. The decomposition rate of phenolic mixture, COD removal and TOC removal increases with increasing pH. A half-order overall kinetic model can correctly describe the decomposition of phenolic mixture. The BOD(5)/COD ratio of the preozonized solutions increases with increasing preozonation time, indicating that preozonation can enhance the biodegradability. Based on high ozone utilization rate, it is concluded that the best characteristic time can be chosen at the rapid increase of ozone gas outlet concentration. Since the ozone gas outlet concentration can be easily monitored, it is a useful real-time control parameter in preozonation.
authors.affiliation: Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Sector 4, Keelung Road, Taipei 106, Taiwan. hsu@ch.ntust.edu.tw
authors.forename: Yung-Chien
authors.initials: YC
authors.lastname: Hsu
authors.forename: Hsiang-Cheng
authors.initials: HC
authors.lastname: Yang
authors.forename: Jyh-Herng
authors.initials: JH
authors.lastname: Chen
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002244:Carbon / Q000032:analysis; D002733:Chlorophenols / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D003408:Cresols / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D010126:Ozone / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000378:metabolism; D018508:Water Purification / Q000379:methods*
chemical_list: D002733:Chlorophenols; D003408:Cresols; D010083:Oxidants, Photochemical; D014874:Water Pollutants, Chemical; C032538:4-cresol; D010126:Ozone; D002244:Carbon; C030683:2-chlorophenol; D010100:Oxygen