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TOXICITY IDENTIFICATION EVALUATION OF A WASTEWATER TREATMENT PLANT EFFLUENT WITH IONIC TOXICANTS
Citation:
NorbergKing, T J., T D. Dawson, AND K. G. Lott. TOXICITY IDENTIFICATION EVALUATION OF A WASTEWATER TREATMENT PLANT EFFLUENT WITH IONIC TOXICANTS. In Proceedings, SETAC-sponsored workshop on Toxicity Identification Evaluation (TIE), Baltimore, MD, November 11-15, 2001.
Description:
A publicly owned treatment works (POTW) effluent had been shown to cause chronic toxicity with the cladoceran, Ceriodaphnia dubia. We conducted A TIE and the weight-of-evidence approach identified chloride as a major contributor to the effluent toxicity. Several characterization tests provided evidence of ion toxicity: Phase 1 toxicity identification evaluation characterization tests did not substantially reduce the effluent toxicity...The mock effluent tests confirmed that the level of chloride found in the effluent was toxic to C. dubia... When mock effluent samples were prepared similarly to the effluent, tests with calcium additions reduced chloride toxicity in waters with an ionic composition similar to the effluent...Measured concentrations of copper and zinc in the effluent and the reductions in toxicity sometimes observed with the Phase 1 characterization tests (i.e. the EDTA addition test) suggested that one or both metals could have been contributing to effluent toxicity. However, data to correlate these effects were not definitive. If chloride concentrations were reduced, additional contributors to effluent toxicity could be characterized.