Abstract
A dynamic water quality model of a oxidation pond is proposed . The model attemps to simulate the seasonal variation of water quality in a oxidation pond in response to temperature and light intensity . The model consisting of two horizontal layers can explain the seasonal variation of dissolved oxygen, suspended solids, total dissolved phosphorus and dissolved organic carbon concentrations consistently . The water load per unit area mainly determines dissolved phosphorus concentra tion in treatment water. The water load per unit area under 0.1 [m/d] seems to be effective for the elimination of nutrients from the treatment water .
