esm223_11_Reading_ex-situ biodegradation_of_herbicide

esm223_11_Reading_ex-situ biodegradation_of_herbicide -...

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Abstract The J.R. Simplot Ex-Situ Bioremediation Technology is de- signed to anaerobically degrade nitroaromatic and energetic compounds in soils and liquids without forming identifiable toxic intermediate compounds produced by other biotreatment methods. This technology was evaluated under the Super- fund Innovative Technology Evaluation (SITE) Program on soils contaminated with 2- sec -butyl-4,6-dinitrophenol (dinoseb), a RCRA-listed herbicide (P020). The Demonstration was at a county-owned airport in Ellensburg, WA (Bowers Field). A companion SITE Demonstration of this technology was per- formed on 2,4,6-trinitrotoluene (TNT). Another SITE Technol- ogy Capsule will be provided at a later date. The Best Demonstrated Available Technology (BDAT) for dinoseb-con- taminated soils is incineration, therefore, any alternative tech- nology that can economically compete with incineration is of interest. Comparison of the dinoseb levels before and after treatment showed a reduction of greater than 99.8% based on the analytical instrumentation detection limit. The time of treat- ment for 30 m 3 (39 yd 3 ) of soil was found to be 23 days, much faster than initially anticipated. This is despite the average temperature within the bioreactor being 18˚C, far below the preferred temperature range of 35 to 37˚C (1) . Other com- pounds, namely nitroaniline; parathion; malathion; and 4,4'- DDT were incidentally and simultaneously reduced from parts-per-million levels in the feed soil to below the analytical detection limit in the treated slurry. No toxic by-products caused by the degradation of dinoseb were found by GC/MS analysis of the post-treatment samples. Introduction This Capsule provides information on the J.R. Simplot Ex-Situ Bioremediation Technology, a technology developed to re- move nitroaromatic and energetic compounds from soils and liquids. For the purpose of this Capsule, the technology was evaluated on dinoseb-contaminated soil. For more information on the SITE Program please referto the “SITE Program” section of this Capsule. The J.R. Simplot Ex-Situ Bioremedia- tion Technology for the degradation of dinoseb was evaluated under EPA’s SITE Program during June and July 1993 at Bowers Field. Soils at Bowers Field were previously contami- nated with dinoseb, probably by crop dusting activities. Infor- mation in this Capsule emphasizes specific site characteristics and results of the SITE demonstration at Bowers Field. Re- sults obtained independently by the J.R. Simplot Company (Simplot) during treatability studies are summarized in the Technology Status section. This Capsule presents the follow- ing information: · Technology Description · Technology Applicability · Technology Limitations · Process Residuals · Site Requirements · Performance Data · Economic Analysis · Technology Status · SITE Program · Source of Further Information The J.R. Simplot Ex-Situ Bioremediation Technology was evaluated based on seven criteria used for decision-making in the Superfund Feasibility Study (FS) process. Results of the evaluation are summarized in Table 1.
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esm223_11_Reading_ex-situ biodegradation_of_herbicide -...

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