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SUCCESSFUL AEROBIC BIOREMEDIATION OF GROUNDWATER CONTAMINATED WITH HIGHER CHLORINATED PHENOLS BY INDIGENOUS DEGRADER BACTERIA
Mikkonen A., K. Ylaranta, M. Tiirola, L.A.L Dutra, P. Salmi, M. Romantschuk, S. Copley, et al.
Water Research 138:118-128(2018)

Results from a 4-year full-scale in situ biostimulation of a chlorophenol-contaminated aquifer by circulation and re-infiltration of aerated groundwater at a sawmill site showed a decrease of pentachlorophenol from 400 µg/L to <1 µg/L and tetrachlorophenols from 4000 µg/L to <10 µg/L. The pcpB gene was present in up to 10% of the indigenous bacteria at 4 months after the start of aeration. Hotspot groundwater higher-chlorinated phenols from this site were degraded efficiently during a 3-week microcosm incubation with one-time aeration but no other additives: from 5400 µg/L to 1200 µg/L and to 200 µg/L in lightly and fully aerated microcosms. Accumulation of lower-chlorinated metabolites was observed in neither in situ remediation nor microcosms, supporting the assumption that removal was due to the aerobic degradation pathway where the first step limits the mineralization rate.



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