Hybrid constructed wetlands for highly polluted river water treatment and comparison of surface-and subsurface-flow cells

作     者：Yucong Zheng Xiaochang Wang Jiaqing Xiong Yongjun Liu Yaqian Zhao 

作者机构：Key Laboratory of Northwest Water Resource Environment and Ecology Ministry of Education Xi'an University of Architecture and Technology School of Civil Structural and Environmental Engineering University College Dublin 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2014年第26卷第4期

页      面：749-756页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：supported by the National Natural Science Foundation of China(No.50838005,51021140002) the Program for Innovative Research Team in Shaanxi(No.2013KCT-13) 

主　　题：constructed wetland surface flow subsurface flow polluted river water treatment 

摘      要：A series of large pilot constructed wetland （CW） systems were constructed near the confluence of an urban stream to a larger fiver in Xi＇an, a northwestern megacity in China, for treating polluted stream water before it entered the receiving water body. Each CW system is a combination of surface- and subsurface-flow cells with local gravel, sand or slag as substrates and Phragmites australis and Typha orientalis as plants. During a one-year operation with an average surface loading of 0.053 m3/（***）, the overall COD, BOD, NH3-N, total nitrogen （TN） and total phosphorus （TP） removals were 72.7% ~ 4.5%, 93.4% ＋ 2.1%, 54.0% ＋ 6.3%, 53.9% ~ 6.0% and 69.4% ：t： 4.6%, respectively, which brought about an effective improvement of the fiver water quality. Surface-flow cells showed better NH3-N removal than their TN removal while subsurface-flow cells showed better TN removal than their NH3-N removal. Using local slag as the substrate, the organic and phosphorus removal could be much improved. Seasonal variation was also found in the removal of all the pollutants and autumn seemed to be the best season for pollutant removal due to the moderate water temperature and well grown plants in the CWs.