Abstract
This paper aims at providing design guidelines for a Horizontal sub surface flow constructed wetland treating greywater from single household in Tropical Island. The system was operated using synthetic greywater at variable operating conditions over a period of 41 weeks. The performance was assessed in terms of biological oxygen demand removal efficiency. The biological oxygen demand rate constant was determined using the first order plug flow model by fitting the observed values along the bed. A mean removal efficiency of 84 ± 3.5% (n = 32) was achieved for this system. The biological oxygen demand rate constant values ranging from 0.34–0.50 m/d and averaging to 0.43 ± 0.06 m/d (n = 32) were obtained. Hence rate constants have been developed and can be used for sizing of beds treating greywater in tropical regions.
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