Biodegradation of an Organophosphate Chemical Warfare Agent Simulant by Activated Sludge with Varying Solid Retention Times

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 t...

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Bibliographic Details
Main Author: Janeczko, Allen K
Format: Report
Language:English
Subjects:
ACETYLCHOLINESTERASE
ACTIVATED SLUDGE
ACTIVATED SLUDGE PROCESS
AMMONIA
AMMONIUM HYDROXIDE
BACTERIA
Biochemistry
BIODEGRADATION
CHEMICAL AGENT SIMULANTS
Chemical, Biological and Radiological Warfare
COD(CHEMICAL OXYGEN DEMAND)
GAS CHROMATOGRAPHY
HETEROTROPHIC BACTERIA
HYDROXIDES
MALATHION
MASS SPECTROMETRY
NERVE AGENTS
NITRATES
Organic Chemistry
ORGANOPHOSPHATES
OXIDATION
SRT(SOLID RETENTION TIME)
TOXICOLOGY
VX AGENT
WASTE WATER
WASTEWATER TREATMENT FACILITIES
Water Pollution and Control
WATER TREATMENT
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Summary: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. The original document contains color images.