Abstract
Temperature, salinity and concentrations of dissolved oxygen, nutrients, chlorophyll a, particulate carbon and nitrogen concentrations in sea water near the Keratsini sewage outfall are reported. Suggestions are made on the proposed length of the outfall diffuser and the extent of the sewage treatment. Eutrophication in the area around the outfall is demonstrated by enhanced chlorophyll a, particulate carbon and particulate nitrogen concentrations. For they provide evidence for high phytoplankton standing stock. However no appreciable differences in the inorganic nutrient levels between the outfall area and the normal background were observed. This suggests rapid uptake of nurients that/or effective dispersal from the outfall. The study indicates that in the case of oligotrophic waters and in the absence of the dissolved oxygen depletion, primary treatment may be preferable to secondary treatment.
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