title: Simultaneous enhancement of organics and nitrogen removal in drinking water biofilm pretreatment system with reed addition.
abstract: A novel drinking water biofilm pretreatment process with reed addition was established for enhancement of simultaneously organics and nitrogen removal. Results showed that nitrate removal efficiency was positively related with the influent C/N ratio, reaching to 87.8±2.8% at the C/N ratio of 4.7. However, the predicted trichloromethane (THM) levels based on total organic carbon (TOC) and UV254 were high with the increase of influent C/N ratio. Combined with the pollutants removal performance and microbial community variation, an appropriate C/N ratio via reed addition was determined at 2.2 for the continuous biofilm reactor. With adjustment of hydraulic retention time (HRT), the highest of nitrate removal efficiency (74.2±1.4%) and organics utilization efficiency (0.63 mg NO3--N mg(-1)TOC) were achieved at an optimum HRT of 18 h, with both low effluent NO3--N (0.88±0.03 mg l(-1)) and TOC (2.86±0.67 mg l(-1)).
authors.affiliation: Department of Environmental Engineering, Zhejiang University, No. 866 Yuhangtang Road, Hangzhou 310058, PR China.
authors.forename: Li-Juan
authors.initials: LJ
authors.lastname: Feng
authors.forename: Liang
authors.initials: L
authors.lastname: Zhu
authors.forename: Qi
authors.initials: Q
authors.lastname: Yang
authors.forename: Guang-Feng
authors.initials: GF
authors.lastname: Yang
authors.forename: Jian
authors.initials: J
authors.lastname: Xu
authors.forename: Xiang-Yang
authors.initials: XY
authors.lastname: Xu
mesh_terms: D001673:Biodegradation, Environmental; D018441:Biofilms / Q000254:growth & development*; D060766:Drinking Water / Q000382:microbiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D059013:Microbial Consortia / Q000502:physiology*; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism*; D009930:Organic Chemicals / Q000302:isolation & purification / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D060766:Drinking Water; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D009584:Nitrogen