Abstract
Abstract Two aerobic laboratory‐scale continuous‐flow fluidized‐bed reactors were used to study biological ground water decontamination from chlorophenols. Biomass in both reactors was enriched using synthetic chlorophenol feed. The chlorophenol degradation was monitored by inorganic chloride release (ICl), organic carbon removal and gas Chromatographic analyses. The chlorophenol concentration in Karkola aquifer, Finland remained stable through a two year period. Fluidized‐bed treatment of ground water contaminated with 44–55 mgl‐1 of chlorophenols resulted in less than 1 mgl‐1 effluent concentrations and corresponding ICl releases. 99% chlorophenol degradation was maintained even at 45 min hydraulic retention time (HRT) and 1500 gCPm‐3 d‐1 loading rate. During gradual temperature decrease from 25–30°C to 10°C within 4 months, ICl release remained stable. At 10°C, over 99 % chlorophenol removal, and effluent concentrations of less than 0.1 mgl‐1, were maintained at 5 h HRT and 240 gCPm‐3d‐1 loading rate. ...
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