Performance Evaluation of Selected Macrophytes and Filter Media in Tertiary Hospital Wastewater Treatment
Keywords:
Constructed Wetlands, V. nigritana, P. Karka, substrate, wastewaterAbstract
Biologically-based on-site pollution-prevention and recycling technologies that require low energy and labour costs are more economically attractive in wastewater treatment. This research work investigates the efficiency of constructed wetland using granite and sand as substrate on the removal of pollutants from wastewater. The experimental setup consists of eight microcosms planted with the locally available macrophytes using fine and coarse substrate. The microcosms were irrigated using wastewater from a tertiary hospital, pollution parameters were measured using the standard APHA method and growth rate was monitored. Phosphate removal was high in Constructed Wetland microcosm planted with P. Karka than V. nigritana (66.88 % and 68.65 % reductions respectively). The experimental studies also revealed a 68.18 % and 66.36 % reduction in TSS for V. nigritana and P. Karka respectively. Percentage BOD5 reduction of 58.39 % and 65.77 % in V. nigritana and P. karka was also observed. The design of Constructed Wetland for the tertiary hospital, based on the preliminary analysis shows four Vegetated Submerged Bed Constructed Wetland cells each 63.73 x 75 m. Coarse aggregates are suitable as filter media in Constructed Wetlands than fine aggregate in treating wastewater from a tertiary hospital.
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