Accession Number : ADA585288


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


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Janeczko, Allen K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a585288.pdf


Report Date : 21 Mar 2013


Pagination or Media Count : 64


Abstract : 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.


Descriptors :   *ACTIVATED SLUDGE PROCESS , *BIODEGRADATION , *CHEMICAL AGENT SIMULANTS , *ORGANOPHOSPHATES , ACETYLCHOLINESTERASE , AMMONIA , BACTERIA , GAS CHROMATOGRAPHY , HYDROXIDES , MALATHION , MASS SPECTROMETRY , NERVE AGENTS , NITRATES , OXIDATION , TOXICOLOGY , VX AGENT , WASTE WATER , WATER TREATMENT


Subject Categories : Biochemistry
      Organic Chemistry
      Chemical, Biological and Radiological Warfare
      Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE