Biodegradation of an Organophosphate Chemical Warfare Agent Simulant by Activated Sludge with Varying Solid Retention Times
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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This study examined the fate of malathion, a surrogate compound for VX studies, in bench-scale sequencing batch bioreactors being operated under varied solid retention times SRTs to simulate the activated sludge process in wastewater treatment facilities. Results show that a constant influent of the malathion will largely be removed. However, the heterotrophic bacteria undergo a stress response which temporarily inhibits malathion removal, the extent of which increases with increasing SRTs. After this stress response takes place, the activated sludge is able to resume a high degree of malathion removal, even with increased influent concentration however, this is done so at the expense of acceptable COD removal in the effluent, suggesting malathion may be toxic to the heterotrophic bacteria in activated sludge.
- Organic Chemistry
- Chemical, Biological and Radiological Warfare
- Water Pollution and Control