MICROTOX EVALUATION OF INDUSTRIAL WASTEWATERS

The main purpose of this study was to establish an inhibitory database using the Microtox assay for different wastes. The waste samples incl uded 19 pretreated industrial wastes from two different industrial par ks, 11 other industrial wastes outside industrial parks, and different treatment process effluents. The following is a brief summary of the findings from this study: (1) COD and BOD had a close relationship amo ng different wastes; (2) Microtox data did not correlate with the conv entional parameters of BOD, COD and SS; (3) many wastes did not meet t he pretreatment standards and exhibited high Microtox toxicity; (4) so me wastes exhibited high Microtox toxicity, although they met the pret reatment standards; (5) the mixture of the individual wastes exhibited an antagonistic effect; (6) the activated sludge process removed 60-7 5% of influent toxicity; and (7) the final effluent sometimes showed a n increase in Microtox toxicity.