Author(s): Nur Lia Johari; Chun Kiat Chang; Aminuddin Ab. Ghani; Marfiah Ab. Wahid; Suhaimi Abdul-Talib
Keywords: Newly rehabilitated wetland; Performance; Water quality control
Abstract: Constructed wetlands as the best management practices can be explicitly designed to aid in pollutant removal from stormwater. The treatment in constructed wetlands involves several mechanisms, namely, coagulation, filtration, sedimentation and sorption. The operation and maintenance costs for constructed wetlands is lower compared to alternative treatment options, necessitating a superior operation for constructed wetland to achieve optimum performance of stormwater treatment. A study was conducted based on actual constructed wetland located in Universiti Sains Malaysia (USM) Engineering Campus, Penang, Malaysia, focusing on the changes of the newly rehabilitated wetland performance in enhancing the stormwater quality. The parameters that investigated were p H, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammoniacal nitrogen (AN) and total suspended solid (TSS). The Water Quality Index (WQI) and National Water Quality Standards for Malaysia (NWQS) were studied for the year of 2013 and 2014. The results showed that the performance of constructed wetland was maintained after one year. These results were explained further by the treatment media in constructed wetland throughout the study period. Therefore, an appropriate design of constructed wetland with the consideration of long term performance definitely can contribute the stormwater runoff quality enhancement.