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PM09 WET Testing
(PM159) Using NITROTOX Test Kits for Toxicity Identification Evaluation (TIE) of a Refinery Wastewater.
Horne, J1, Cang, Y1, Perez, J2, 1 PBS&J Environmental Toxicology Laboratory, Houston, Texas, USA2 InterLab, The Woodlands, Texas, USA
ABSTRACT- A refinery wastewater treater, consisting of spent caustic treatment, oil & solids removal, and biological (activated sludge) treatment, experienced a series of upsets characterized by abnormally-high ammonia concentrations in the treated effluent and a concomitant loss of biomass in the activated sludge unit. During each upset event, the off-spec effluent was routed to holding ponds and subsequently re-treated before discharge at the final outfall. Influent wastewater samples were collected and screened for toxicity to nitrifying bacteria using NITROTOX test kits. The screen tests were successful in ranking the influent wastes with respect to nitrification inhibition potential. Because the most toxic sample was a complex mixture of waste waters from several different processes (which would have been difficult and/or costly to sample and test individually), it was determined that whole effluent toxicity identification evaluation (TIE) methods coupled with the NITROTOX could be beneficial to further locating and characterizing the primary source(s) of nitrifying-bacteria toxicity. Traditional Phase I TIE treatments (pH adjustment, filtration, solid-phase extraction, aeration, cation exchange, EDTA and sodium thiosulfate), as well as chemical oxidation (hydrogen peroxide), were applied (in parallel and sequentially) to diluted refinery wastes and tested using the NITROTOX test kit. Test results showed that combined NITROTOX-TIE methods may be used to quickly screen high-strength refinery waste waters for nitrification-inhibition potential.
Key words: nitrification inhibition, NITROTOX, toxicity identification evaluation (TIE), complex mixtures
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