INVESTIGATION OF 3 WASTEWATERS ENTERING IZMIT BAY (TURKEY) BY MEANS OF BATCH AND CHEMOSTAT CULTURE ALGAL BIOASSAYS

The ball of Izmit is the focus of much of Turkey's industrial developm ent and three of the most important of the wastes discharged into its surface waters have been studied as a necessary step in minimising the ir environmental impact. Gas chromatography/mass spectrometry of the e xtracted wastes revealed the presence of organic xenobiotics listed as priority pollutants. Nevertheless, measurements of cell populations, chlorophyll fluorescence and the consumption of nutrients demonstrated that most of the wastes stimulated the grow th of both batch and chem ostat cultures of Phaeodactylum tricornutum (Bohlin). Experiments show ed the growth of the cultures to be phosphate limited and it appears t hat the major effect of the wastes was due to their excessive loading of phosphate. (C) 1998 Elsevier Science Ltd. All rights reserved.