title: [Study on the oxygen condition in subsurface flow wetlands in operation].
abstract: Horizontal flow wetlands with various kinds of plants grown were studied on their operation characteristics and oxygen condition in treating the sewage out from the primary sedimentary basin. The rules of oxygen condition changed with space and time were studied. Researches showed the oxygen concentration was low in wetlands, and it appeared as a rule that low in both ends, but high in middle of beds. It descended in upright direction. The oxygen concentration changed with seasons as summer > spring > autumn > winter. In one day, the highest oxygen concentration appeared on 14:00, and the concentration was higher in forenoon than afternoon. Reed > canna > camellia > dracaena sanderiana > ipomoea aquatica forsk by comparison of ability of oxygen supply. Experiments demonstrate that the study of oxygen condition in constructed wetlands is propitious to reveal the purifying mechanism of wetlands and improve the purifying efficiency.
authors.affiliation: Department of Municipal Engineering, Southeast University, Nanjing 210096, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Yan
authors.forename: Shi-he
authors.initials: SH
authors.lastname: Wang
authors.forename: Wei-guo
authors.initials: WG
authors.lastname: Luo
authors.forename: Juan
authors.initials: J
authors.lastname: Huang
authors.forename: Qiu-shuang
authors.initials: QS
authors.lastname: Zhong
mesh_terms: D001673:Biodegradation, Environmental; D052918:Environmental Restoration and Remediation / Q000379:methods; D010100:Oxygen / Q000032:analysis* / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D012621:Seasons; D012988:Soil Microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D053833:Wetlands
chemical_list: D010100:Oxygen