Summary of Case Study Analytical Results

The goal of the demonstration project was to study the effectiveness of the formed-in-place hyperfiltration membrane unit, operating in a cross-flow mode, for the concentration of PAHs (and PCP) from contaminated groundwater found at a wood treating site. The original plans called for a companion study of a proprietary biodegradation process for the concentrate however, a decision was made during this study not to carry out that portion of the study. 

Based on available information, including a Remedial Investigation / Feasibility Study (RI/FS), the American Creosote Works site in Pensacola, Florida was selected for the investigation. The site was included on the National Priorities List on the basis of the RI/FS study which suggested that the groundwater imder the site was heavily contaminated with both PAHs and PCP. 

The American Creosote Works site had been used for wood treatment from 1902 to 1981. Creosote was the preservative used until the 1970 s when a shift was made to pentachlorophenol in a light oil. Over the years, wood impregnation was carried out in open toughs, resulting in spills and drippage which seeped into the ground. 

To achieve the desired volumes and concentrations, the feedwater was introduced during the first two hours (approximately) of each day s run. For the remainder of each day s run, the reject (concentrate) was recycled, becoming the feed, while the permeate was continuously removed and discharged after samples were composited for analysis. Each day s run was terminated when the flowmeters indicated Aat the 

Samples were analyzed for oil and grease, dissolved and suspended solids, volatile organics, TOG, COD, and dioxins/furans in addition to the list of designated semivolatile organics used in evaluating the developer s claims. 

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