Water quality has been deteriorated by the excess development in the catchment. It is desirable to pay more attention to improve or upgrade the performance of existing water treatment plant.In this study,we first made an comprehensive evaluation to the plant units ant their chemical dosing in Feng-Yuan water treatment facility.The turbidity removal efficiency was a key parameter to conduct this task. The results from the evaluation of plant units clearly that solid removal units including flocculators,clarifier,and filters are all in the overloading operations,especially for the flocculator and filter.
