title: Nitrogen removal in micro-polluted surface water by the combined process of bio-filter and ecological gravel bed.
abstract: Nitrogen removal in micro-polluted surface water by the combined process of a bio-filter and an ecological gravel bed was studied. Sodium acetate was added into micro-polluted surface water as carbon source and the nitrogen removal under different C/N ratio, hydraulic load and temperature were investigated. The results showed that the variations in C/N ratio, hydraulic load and temperature have significant influence on nitrogen removal in bio-filter. It was found that the denitrification rate was above 90% when C/N ratio reached 10; also, the denitrification was inhibited at low water temperature (2-10 °C); at the condition of water temperature above 20 °C, C/N ratio 10, hydraulic load 8 m(3)/(m(2) h), the combined process obtained the nitrogen removal of more than 90%, and the residual organics could be removed in ecological gravel bed.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai, China. heshengbing@sjtu.edu.cn
authors.forename: He
authors.initials: H
authors.lastname: Sheng-Bing
authors.forename: Gao
authors.initials: G
authors.lastname: Jian-Wen
authors.forename: Chen
authors.initials: C
authors.lastname: Xue-Chu
authors.forename: Dai
authors.initials: D
authors.lastname: Ding-Li
mesh_terms: D004463:Ecology; D005374:Filtration / Q000379:methods*; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D009584:Nitrogen