Date of Award


Document Type


Degree Name

Master of Science in Combating Weapons of Mass Destruction


Department of Systems Engineering and Management

Second Advisor

Leeann Racz, PhD.


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.

AFIT Designator


DTIC Accession Number