REMOVAL OF NUTRIENTS FROM DOMESTIC WASTEWATER IN A HYBRID SUBSURFACE FLOW CONSTRUCTED WETLANDKARUNA N. POHEKAR AND NEETU RANI
Domestic wastewater has largest percentage of all wastewater generated from urban and rural areas hence it is major contributor to water pollution. Presence of nutrients in domestic wastewater contributes to eutrophication. It is therefore essential to reduce the concentration of these nutrients present in domestic wastewater to avoid any further adverse implication in water bodies. In this context, present study focused on the removal of nitrogen and phosphate from the domestic wastewater using two stage hybrid subsurface flow constructed wetland planted with Arundo donax. System consisting of vertical and horizontal subsurface flow wetland was operated for a period of 11 months. pH and temperature values during the study period were in the range of 7-8.5 and 11.1 to 37.5oC respectively. Removal efficiency of Total Kjeldahl Nitrogen was observed 95.7%, 93.49% and 89% and for phosphate 55.54%, 41.64% and 20.43% respectively during summer, post monsoon and winter season in planted hybrid constructed wetland at a flow rate of 65 L/day. Since the removal of phosphate was not good enough so adsorbent prepared from eggshell was applied within the system that helped in improving the phosphate removal in hybrid constructed wetland.