title: Treatment of azo dye Acid Orange 7 containing wastewater using up-flow constructed wetland with and without supplementary aeration.
abstract: The aim of this study is to examine and compare the treatment performance of Acid Orange 7 (AO7) containing wastewater by up-flow constructed wetland (UFCW) at different AO7 concentrations, hydraulic retention times (HRT) and alternative of supplementary aeration. The aerated wetland reactor outperformed the non-aerated one in the removal of organic matters, NH(4)-N and aromatic amines. The T-P removal efficiency for both wetland reactors was not much different throughout the study and the supplementary aeration showed no significant effect on T-P removal. As influent AO7 concentration increased from 50 to 100 mg/L, the performance in biodegradation of organic matters and nitrification in the non-aerated wetland reactor, and denitrification and decolorization in the aerated wetland reactor were affected. As HRT increased from 3 to 6 d, the removal of NH(4)-N and NO(3)-N in the aerated wetland reactor was not significantly different, but the NH(4)-N removal efficiency improved tremendously in the non-aerated wetland reactor.
authors.affiliation: Graduate School of Science and Technology, Niigata University, 8050, Ikarashi 2, Nishi-ku, Niigata 950-2181, Japan. ongsoonan@yahoo.com
authors.forename: Soon-An
authors.initials: SA
authors.lastname: Ong
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Uchiyama
authors.forename: Daisuke
authors.initials: D
authors.lastname: Inadama
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ishida
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Yamagiwa
mesh_terms: D000332:Aerobiosis; D000388:Air / Q000032:analysis; D000641:Ammonia / Q000032:analysis; D001391:Azo Compounds / Q000302:isolation & purification*; D001557:Benzenesulfonates / Q000302:isolation & purification*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D004396:Coloring Agents / Q000302:isolation & purification*; D009566:Nitrates / Q000302:isolation & purification; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*; D053833:Wetlands
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D000641:Ammonia; C014722:2-naphthol orange; D010100:Oxygen