The purpose of this work is to show the effects of bio-oxidation of a pesticide through a spiral wound bioreactor using immobilized mixed culture bacteria. The pesticide used for this study is Isotox® and its active ingredients are acephate or O,S-dimethyl acetylphosphoramidothioate and vendex or hexakis (2-methyl-2-phenylpropyI)- distannoxane. Qualitative analysis of the product indicated presence of sulfate.

A consistent and unique DO pattern for Isotox^® showed at least 4 minima, whereas phenol has only one minimum. The consistency of the DO pattern for Isotox^® has been observed for over 30 injections into the bioreactor system. For both an acclimated and an unacclimated system, the basic DO pattern was consistent.

The analysis of bio-oxidized reservoir water showed concentrations in the ranges of parts per billion (ppb). About 90% of the vendex injected was adsorbed by the bacteria as indicated by tin analysis of the product water. A single batch of 16.4784 g dry biomass immobilized on a spiral bioreactor was able to effectively remove 2338 ml of the pesticide containing over 1000 ppm tin. Adsorption is on the order of 0.086 g tin per gram dry bacteria.