Biodegradation and Reduction in Aquatic Toxicity of the Persistent Riot Control Material 1,4-Dibenz-Oxazepine

TL;DRAbstract

1,4-Dibenz oxazepine (CR), a strong sensory irritant, has previously been reported as recalcitrant to degradation. Alcaligenes denitrificans denitrificans, CR-1, ATCC #53957, isolated from microcosms spiked with CR, shows potential as a tool for the degradation of CR waste. A. denitrificans were found to have an extremely high tolerance to CR (200 mg/L). The isolates grew well on the synthetic media spiked with 200 mg/L CR, but showed minimal growth on the microcosm media without CR. No detrimental effects of CR-1 on Daphnia magna were observed. After ten days, the organisms were able to reduce the CR concentration from 200 to 25 mg/L. After 22 days, the concentration of CR was below detectable limits. Ten days after A. denitrificans was inoculated into a stock solution of CR, the toxicity to D. magna was reduced more than 50% but not eliminated. Treatment of the CR solution with A. denitrificans resulted in the elimination of toxicity to Selenastrum capricornutum. In trying to elucida

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