文献类型：期刊文献

英文题名：Potential of constructed wetlands in treating the eutrophic water: Evidence from Taihu Lake of China

作者：Li, Linfeng[1,2,4];Li, Yinghao[1];Biswas, Dilip Kumar[1];Nian, Yuegang[3];Jiang, Gaoming[1]

机构：[1]Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;[2]Guangdong Ocean Univ, Coll Agr, Zhanjiang 524088, Peoples R China;[3]Chinese Res Acad Sci, Beijing 100012, Peoples R China;[4]Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China

年份：2008

卷号：99

期号：6

起止页码：1656

外文期刊名：BIORESOURCE TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000253015800023)、、EI(收录号：20080211009769)、WOS

语种：英文

外文关键词：constructed wetlands; nutrient removal; pollution; Taihu Lake; Typha angustifolia

外文摘要：Three parallel units of pilot-scale constructed wetlands (CWs), i.e., vertical subsurface flow (VSF), horizontal subsurface flow (HSF) and free water surface flow (FWS) wetland were experimented to assess their capabilities in purifying eutrophic water of Taihu Lake, China. Lake water was continuously pumped into the CWs at a hydraulic loading rate of 0.64 m d(-1) for each treatment. One year's performance displayed that average removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3--N), total nitrogen (TN) and total phosphorous (TP) were 17-40%, 23-46%, 34-65%, 20-52% and 35-66%, respectively. The VSF and HSF showed statistically similar high potential for nutrients removal except NH4+-N, with the former being 14% higher than that of the latter. However, the FWS wetland showed the least effect compared to the VSF and HSF at the high hydraulic loading rate. Mean effluent TP concentrations in VSF (0.056 mg L-1) and HSF (0.052 mg L-1) nearly reached Grade III (<= 0.05 mg L-1 for lakes and reserviors) water quality standard of China. Wetland plants (Typha angustifolia) grew well in the three CWs. We noted that plant uptake and storage were both important factors responsible for nitrogen and phosphorous removal in the three CWs. However, harvesting of the above ground biomass contributed 20% N and 57% P of the total N and P removed in FWS wetland, whereas it accounted for only 5% and 7% N, and 14% and 17% P of the total N and P removed in VSF and HSF CWs, respectively. Our findings suggest that the constructed wetlands could well treat the eutrophic lake waters in Taihu. If land limiting is considered, VSF and HSF are more appropriate than FWS under higher hydraulic loading rate. (C) 2007 Elsevier Ltd. All rights reserved.