Technical Bulletin 2.2.3.2: Does Competitive Inhibition Play a Role in MTBE Bioremediation?
). We also have several case histories on ORC applications that describe successful MTBE treatment, and good MTBE bioremediation with ORC was reported by Landmeyer et al. (2001) Environmental Science and Technology, Vol. 35, No. 6, p. 1118. Our records show that ORC has been applied to approximately 500 sites with MTBE contamination (with and without BTEX contamination). We monitored the results from the 30 MTBE sites that were in the finishing stages of treatment and found 25% had excellent results, 50% were moderately successful, and 25% had poor results at the time of analysis. Although some of the poor result sites occurred because they were poorly characterized or poorly designed, the most likely reason for the 25% of sites with a poor result is low numbers (or complete absence) of the appropriate MTBE-degrading microbes at the site. This conclusion stems from statistics on the thousands of ORC sites that show that 3% of sites fail because poor site characterization, bad design, o
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