Abbasi Haq Nawaz, Xie Jing, Hussain Syed Ikhlaq, Lu Xiwu
Department of Environmental Science, FUUAST, Karachi, Pakistan E-mail:
SISDI Shanghai Engineering Co., Ltd, Shanghai, China.
Water Sci Technol. 2019 May;79(10):1985-1994. doi: 10.2166/wst.2019.196.
Constructed wetlands (CWs) are an aesthetic and sustainable form to treat wastewater, however, their performance can be increased by improving a number of factors. The pilot-scale hybrid constructed wetland (CW) system was the combination of constructed floating treatment wetlands (CFWs) and horizontal subsurface flow constructed wetlands (HSFCWs); operated for a year and covered all seasons. The research was conducted to investigate the performance of the CW system regarding water depth, spatial, and seasonal removal of pollutants. Nine economical plants species were selected and divided into four groups to grow in CW-I to CW-IV, respectively. Removal increased along the bed and most of the total phosphorus (TP) removal occurred in the second bed, whereas total nitrogen (TN) and ammonium (NH) removal were associated with the plant root system and biomass. Optimum removal of nutrients with respect to water depth was at 35 cm. TN and NH removal patterns were similar in different CWs. TN and NH removal were higher during summer compared to winter; only CW-IV showed the opposite trend.
人工湿地是一种美观且可持续的废水处理形式，然而，通过改善一些因素可以提高其性能。中试规模的混合人工湿地系统是由人工浮床处理湿地（CFW）和水平潜流人工湿地（HSFCW）组合而成；运行了一年，涵盖了所有季节。该研究旨在调查人工湿地系统在水深、空间和季节性污染物去除方面的性能。选择了9种经济植物品种，并分别分成四组种植在湿地I至湿地IV中。沿床体去除率增加，大部分总磷（TP）去除发生在第二个床体，而总氮（TN）和铵（NH）的去除与植物根系和生物量有关。相对于水深，养分的最佳去除深度为35厘米。不同人工湿地中TN和NH的去除模式相似。与冬季相比，夏季TN和NH的去除率更高；只有湿地IV呈现相反趋势。
