氯化石蜡
生物累积
环境化学
湿地
沉积物
生态系统
环境科学
污染物
吸附
水槽(地理)
水生生态系统
化学
生态学
吸附
地质学
生物
地图学
古生物学
有机化学
地理
作者
Hongping Wang,Hong Chang,Zhang Cun-xu,Chenglian Feng,Fengchang Wu
标识
DOI:10.1021/acs.est.0c05694
摘要
Constructed wetlands (CWs) are of great socioeconomic significance because they can remove anthropogenic compounds from aquatic environments. However, no information is available about the removal of persistent chlorinated paraffins by CWs. This study investigates the occurrences, fates, and mass balances of short-chain chlorinated paraffins (SCCPs), medium-chain chlorinated paraffins (MCCPs), and long-chain chlorinated paraffins (LCCPs) in a CW ecosystem. MCCPs were the predominant compounds in water, sediments, and plants within the system. The amounts of SCCPs, MCCPs, and LCCPs entering the wetland were 3.3, 6.8, and 3.4 g/day, respectively. Overall removal efficiencies were 51–78%, 76–86%, and 76–91% for SCCPs, MCCPs, and LCCPs, respectively, and the greatest reduction in CPs was observed in the subsurface flow wetland unit. CPs were predominantly adsorbed onto the sediment and bioaccumulated in the plants, and their organic carbon–water partitioning and plant–water accumulation increased as the carbon and chlorine numbers increased. Sediment sorption (12–38%) and degradation (12–50%) contributed the most to the removal of CPs, but bioaccumulation of CPs in plants (3.8–12%) should not be neglected. Wetlands can economically remove large amounts of CPs, but sediment in the wetland systems could be a sink for CP pollutants.
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