title: Effects of hydraulic retention time and nitrobenzene concentration on the performance of sequential upflow anaerobic filter and air lift reactors in treating nitrobenzene-containing wastewater.
abstract: Sequential upflow anaerobic filter (UAF)/air lift (ALR) reactors were employed to investigate the effects of hydraulic retention time (HRT) and nitrobenzene (NB) concentration on treatment of NB-containing wastewater. The results showed that NB was effectively reduced to aniline (AN) with glucose as co-substrate in the UAF reactor. The AN and the remaining intermediates after the UAF reactor were then efficiently degraded in the ALR reactor. A removal efficiency of 100% and 96% was obtained for NB and chemical oxygen demand (COD), respectively, using sequential UAF/ALR reactors with an HRT of 8-72 h in the UAF reactor and 2-18 h in the ALR reactor. The corresponding optimal influent NB concentration varied between 100 and 400 mg l(-1) to achieve the optimal NB and COD removal. The NB removal efficiency decreased to 90% and to 97% if the HRT in the UAF reactor decreased from 8 to 2 h and the influent NB concentration increased from 400 to 800 mg l(-1), respectively. The results showed that sequential UAF/ALR system can be operated at low HRTs and high NB concentrations without significantly affecting the removal efficiency of NB in the reactor system. The UAF/ALR system can provide an effective yet low cost method for treatment of NB-containing industrial wastewater.
authors: Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions; Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, China; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China, jinhuawu@scut.edu.cn.
authors: Jinhua
authors: J
authors: Wu
authors: Guocai
authors: G
authors: Chen
authors: Jingjing
authors: J
authors: Gu
authors: Weizhao
authors: W
authors: Yin
authors: Mengxiong
authors: M
authors: Lu
authors: Ping
authors: P
authors: Li
authors: Bo
authors: B
authors: Yang
mesh_terms: D000693:Anaerobiosis; D000814:Aniline Compounds / Q000378:metabolism; D019149:Bioreactors; D005227:Fatty Acids / Q000032:analysis; D005374:Filtration; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009578:Nitrobenzenes / Q000032:analysis / Q000378:metabolism*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D000814:Aniline Compounds; D005227:Fatty Acids; D008697:Methane; D009578:Nitrobenzenes; D062065:Wastewater; D014874:Water Pollutants, Chemical; C036077:nitrobenzene; C023650:aniline