Case Study of Ex-situ Biological Treatment of Perchlorate-contaminated Groundwater
نویسنده
چکیده
Groundwater in certain areas at Longhorn Army Ammunition Plant (LHAAP) (Texas) contains volatile organic compounds (VOCs) and perchlorate from past operations at the site. Groundwater from a Burning Ground and Landfill is currently being remediated by pumping the water from an interceptor collection trench system to the surface, removing VOCs and metals in an ex-situ treatment process, and discharging the treated water to a nearby stream. In early 2000, LHAAP’s environmental restoration team took steps to supplement the existing treatment process with a biological fluid bed reactor (FBR) to remove the perchlorate prior to surface water discharge. After preliminary FBR sizing and costing information were obtained, a laboratory treatability program was undertaken to confirm the system design assumptions and demonstrate the effectiveness of the FBR process for treating the LHAAP groundwater. Approximately 650 gallons (2,460 liters) of LHAAP groundwater containing 11,000 to 23,000 (average 16,500) μg/L of perchlorate were used for the evaluation. Both acetic acid and ethanol were investigated as growth (i.e. electron donor) substrates. For the majority of the test, effluent perchlorate concentrations were below the quantitation limit of 5 μg/L, except when the laboratory FBR was operated at a low substrate load to determine the point of treatment failure. The target effluent perchlorate concentration was 350 μg/L. Based on the success of the laboratory test, a full-scale FBR system with the capacity to treat 50 gallons per minute (gpm) (190 liters per minute) of LHAAP water has been installed at the groundwater treatment plant. System start-up occurred in February 2001. The system quickly achieved the target level of perchlorate removal within three weeks of start-up, and has routinely removed perchlorate to less than the limit of detection during normal operation.
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تاریخ انتشار 2002