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Effect of Biodiesel on the Efficacy of Pentachlorophenol Treated Wood
2012 - IRG/WP 12-30584
Pentachlorophenol (PCP) is widely used as a wood preservative for utility poles and other wood products. Recently, it has been proposed that a modified PCP carrier system based on a diesel/biodiesel mixture should be used in place of the conventional diesel/KB3 carrier, but there is some question as to whether or not this modified carrier system can provide the same service life for wood products treated with PCP. The main objective of this research was to evaluate the comparative decay resistance of wood treated with formulations containing either diesel/KB3 or diesel/biodiesel. A two year efficacy study using an accelerated soil contact decay test was initiated to compare the performance of southern yellow pine wood treated with the conventional diesel/KB3 carrier and a modified diesel/biodiesel carrier with biodiesel added, both with and without PCP. The residual hydrocarbon levels, PCP reduction, toxicity and leaching of PCP of the samples almost remained at the same level for treatments with similar PCP retention values for both of these carriers. For wood treated with PCP in these two different carriers, the rate of decay was generally greater particularly for the highest PCP retention level with the biodiesel/diesel formulation, but this difference was not statistically significant. Overall this study suggests that PCP formulated in a biodiesel/diesel carrier is not as effective as the conventional diesel/KB3 formulation against wood decay fungi. However, additional long term field stake tests will be required to determine the practical significance of these results.
S Keshani Langroodi, H Borazjani, D Nicholas, L Prewitt, S V Diehl

Remediation of Pentachlorophenol (PCP) in Biodiesel versus Diesel Carriers
2011 - IRG/WP 11-50279
Biodiesel is believed to be more environmentally friendly than petroleum based diesel when used as a carrier for impregnation of PCP into wood products for protecting wood from decay. A six month study was conducted to evaluate the remediation of PCP in biodiesel versus diesel in soil. Different percentages of biodiesel, diesel and PCP were mixed with clean soil from a forested site and tested. Samples were taken bimonthly and analyzed for oil and grease, PCP concentration and microbial enumeration. Moisture content of the soil was adjusted twice weekly if needed. In addition, toxicity and Toxicity Characteristic Leaching Potential (TCLP) were measured at day 0 and 180. The results showed that with an increase in the percentage of biodiesel, there was an increase in the degradation of diesel and diesel amended PCP. The highest reduction of PCP concentration and toxicity occurred in biodiesel alone by day 180. Results also showed significant reduction over time in oil and grease concentration, PCP concentration and toxicity among different treatments. Based on this study it appears that the co-metabolic effect of biodiesel on microorganisms could accelerate the degradation of PCP in treated wood after disposal.
S Keshani Langroodi, H Borazjani, D Nicholas, L Prewitt, S V Diehl, S Kitchens