Treatment of azo dye Acid Orange 7 containing wastewater using up-flow constructed wetland with and without supplementary aeration

• Published in: Bioresource technology 2010-12, Vol.101 (23), p.9049-9057
• Main Authors: Ong, Soon-An, Uchiyama, Katsuhiro, Inadama, Daisuke, Ishida, Yuji, Yamagiwa, Kazuaki
• Format: Article
• Language: English
• Subjects: Acid Orange 7; Aerated; Aeration; Aerobiosis; Air - analysis; Ammonia - analysis; Applied sciences; Azo Compounds - isolation & purification; Benzenesulfonates - isolation & purification; Biodegradation, Environmental; Biological and medical sciences; Biological treatment of waters; Bioreactors - microbiology; Biotechnology; Coloring Agents - isolation & purification; Construction; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Industrial applications and implications. Economical aspects; Nitrates - isolation & purification; Nutrients; Oranges; Oxidation-Reduction; Oxygen - analysis; Phytoremediation; Pollution; Quaternary Ammonium Compounds - analysis; Reactors; Solubility; Supplementary aeration; Up-flow constructed wetland; Waste Disposal, Fluid - methods; Waste water; Wastewater treatment; Wastewaters; Water Purification - methods; Water treatment and pollution; Wetlands
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2010.07.034

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.