Toxicological Investigations of Pilot Treatment Plant Wastewaters at Holston Army Ammunition Plant
2006
Stilwell, J. M. | Eischen, M. A. | Margard, W. L. | Matthews, M. C. | Stanford, T. B.
The present work conducted at the Holston Army Ammunition Plant in Kingsport, Tennessee was performed by Battelle's Columbus Laboratories in order to determine the toxicity of five wastewaters associated with a pilot biological treatment plant. Manufacturing wastewaters from both Area A and Area B were mixed in a ratio of 1:9 by volume, respectively. This mixture was then treated by two biological systems - the 3A system which consisted of an activated sludge chamber and the 6A system which contained both a trickling filter and an activated sludge chamber. Work performed at HAAP included on-site 96-hour static acute LC50 bioassay tests using fathead minnows. Solutions tested were Area A wastes, Area B wastes, the A+B mixture, the 3A system effluent and the 6A system effluent. Quantitative analyses of RDX, HMX, TNT, and COD in the test waters were also conducted in conjunction with each test. Other water quality parameters monitored by HAAP personnel were correlated with munitions constituents and fish mortality. In-house Ames Spot tests were conducted on all wastewaters from the HAAP pilot plant. The overall results of the on-site bioassay tests indicate that biological treatment, either activated sludge or the combination trickling-filter-activated sludge does reduce the toxicity of the HAAP manufacturing wastewaters.
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