Abstract
A study was carried out in one of the two facultative stabilization ponds operating in parallel and receiving domestic sewage in excess of their capacities. Effluent quality from the pond was monitored in terms of the parameters total suspended solids, biochemical oxygen demand, pH, dissolved oxygen and faecal coliform bacteria before and after the introduction of water hyacinths. No significant improvement in effluent quality was observed after the introduction of the water hyacinths. High loading on the pond did not permit to upgrade the effluent quality to acceptable standards by the use of water hyacinths. Although the research is continuing some results and recommendations are given.
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