Haritash A K, Sharma Ashish, Bahel Kanika
a Department of Environmental Engineering, Delhi Technological University , Delhi , India.
Int J Phytoremediation. 2015;17(10):999-1004. doi: 10.1080/15226514.2014.1003790.
Low cost treatment of polluted wastewater has become a serious challenge in most of the urban areas of developing countries. The present study was undertaken to investigate the potential of Canna lily towards removal of carbon, nitrogen, and phosphorus from wastewater under sub-tropical conditions. A constructed wetland (CW) cell supporting vegetative layer of Canna lily was used to treat wastewater having high strength of CNP. Removal of biological oxygen demand (BOD3) and chemical oxygen demand (COD) varied between 69.8-96.4% and 63.6-99.1%, respectively. C. lily could efficiently remove carbon from a difficult to degrade wastewater at COD:BOD ratio of 24.4. Simultaneous reduction in TKN and nitrate pointed to good nitrification rates, and efficient plant assimilation as the dominant nutrient removal mechanism in the present study. Suitable Indian agro-climatic conditions favored plant growth and no evident stress over the Canna plant was observed. High removal rate of 809.8 mg/m(2)-day for TKN, 15.0 mg/m(2)-day for nitrate, and 164.2 mg/m(2)-day for phosphate suggests for a possible use of Canna-based CW for wastewater treatment for small, rural, and remote Indian communities.
在大多数发展中国家的城市地区，低成本处理受污染废水已成为一项严峻挑战。本研究旨在调查亚热带条件下美人蕉去除废水中碳、氮和磷的潜力。一个支撑美人蕉植被层的人工湿地（CW）单元被用于处理具有高浓度碳、氮、磷的废水。生物需氧量（BOD3）和化学需氧量（COD）的去除率分别在69.8 - 96.4%和63.6 - 99.1%之间。美人蕉能够在COD:BOD比值为24.4的情况下，从难降解废水中有效去除碳。总凯氏氮（TKN）和硝酸盐的同时减少表明硝化速率良好，并且在本研究中，有效的植物同化是主要的养分去除机制。适宜的印度农业气候条件有利于植物生长，未观察到美人蕉植物有明显压力。TKN的高去除率为809.8毫克/平方米·天，硝酸盐为15.0毫克/平方米·天，磷酸盐为164.2毫克/平方米·天，这表明基于美人蕉的人工湿地有可能用于印度小型农村和偏远社区的废水处理。
