Bioremediation Treatability Study for Remedial Action at Popile, Inc. Site, El Dorado, Arkansas. Phase II. Pilot-Scale Evaluation
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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A pilot-scale study of traditional landfarming techniques was conducted to evaluate the treatment requirements directed in the Comprehensive Environmental Remediation Compensation and Liability Act CERCLA Record of Decision ROD from EPA Region 6 for this site. The study was conducted to a determine if treatment goals specified in the ROD were achievable for site soils 5-ppm benzoapyrene BaP equivalents and 3-ppm pentachlorophenol PCP b evaluate contaminant degradation kinetics and c evaluate leaching potential of treated soil. Initial soil characterization physical, chemical, biological indicated a claysilt soil based on Atterberg limits and particle size distribution with high contamination polycyclic aromatic hydrocarbons PAH 13,000 ppm PCP 775 ppm, BaP eq 105 ppm, and an indigenous biological community approximately 10 to the 7th power cellsg as determined by ester linked polar lipid fatty acid PLFA analysis. Intermittently scheduled experimental analysis included contaminant concentration, nutrient concentration, pH, moisture, in situ respiration, and microbial communitybiomass analysis. The pilot-scale site consisted of a modified RCRA secondary containment system that contained two, 3-cu yd land-treatment units LTUs designed to simulate field conditions. LTU 1 was cultivated on an oxygen-dependent basis. LTU 2 was cultivated on a fixed schedule. Soil moisture was maintained between 50 and 80 of field moisture capacity. A novel in situ respiration analysis technique was developed using a custom fabricated dry well and an in-line 02, CO2, CH4 analyzer to evaluate aerobic biological activity. Before and after treatment leachability analyses were conducted using the Sequential Batch Leachate Test SBLT and the Synthetic Precipitate Leaching Procedure SPLP to evaluate the groundwater implications of the underlying aquifer when the treated material is placed back onsite.
- Water Pollution and Control
- Pesticides Pollution and Control