title: Differences in the treatment efficiency of a cold-resistant floating bed plant receiving two types of low-pollution wastewater.
abstract: A floating bed system vegetated with Oenanthe javanica was adopted in this study to treat two types of low-pollution wastewater (LPW): polluted river water (PRW) and treated domestic wastewater (DW). The water was treated for 111 days during the low-temperature season. The results indicated that the total nitrogen (TN) removal rates were higher in the DW groups than in the PRW groups during the initial 30 days. This difference may stem from the different C/N ratio of the influent. As the water temperature rose above 15.5 °C after March 12, the purification capability of nitrogen in the DW groups was enhanced, and the removal rates of TN were 89.8 and 76.8 % in DW and the control 2 at 111 days. Conversely, the performance of total phosphorus (TP) removal was robust during the initial stage of the experiment, despite receiving domestic wastewater with a relatively high N/P ratio (16:1). The TP removal rates in DW were as high as 91.5 % compared to 78.9 % in PRW at 30 days. At the same time, the N/P ratios of plant tissue were higher in the DW groups compared to that in the PRW groups. Plant uptake played a significant role in nutrient removal in the PRW groups (52.5 % for TN, 68.2 % for TP), followed by sedimentation. In contrast, plant uptake only accounted for 25.3 % of TN removal and 24.1 % of TP removal in DW. The results provide engineering parameters for the future design of an ecological remediation technology for LPW purification.
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Duan
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.|State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
authors.forename: Yingliang
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
authors.forename: Shiying
authors.initials: S
authors.lastname: He
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
authors.forename: Lihong
authors.initials: L
authors.lastname: Xue
authors.affiliation: Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China. lzyang@issas.ac.cn.
authors.forename: Linzhang
authors.initials: L
authors.lastname: Yang
mesh_terms: D001673:Biodegradation, Environmental; D003080:Cold Temperature; D004784:Environmental Monitoring; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D010944:Plants; D045483:Rivers / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014876:Water Pollution / Q000517:prevention & control
chemical_list: D009584:Nitrogen; D010758:Phosphorus; D062065:Wastewater
keywords: C/N ratio; Floating bed; Low-pollution wastewater; Low-temperature season; Nutrient removal