Abstract
Concentrations of major ions, total phosphorus, dissolved organic carbon, biological oxygen demand and chlorophyll-a of epilithic algae were determined weekly at nine sites in a Japanese stream receiving effluent from a groundwater treatment plant. The concentrations of four major cations (Na, K, Ca and Mg) and chloride ion increased significantly immediately at downstream sites of the effluent outfall. The ionic concentrations decreased with increasing dilution from merging tributaries but never reached the original concentrations and relative composition of stream water within a 10.7 km stream distance from the outfall. The changes in total ionic concentration and relative ionic proportion also changed the chlorophyll-a content of epilithic algae. The results also showed significantly higher chlorophyll-a content in epilithic algae under moderate salinity.
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