Graduate Thesis Or Dissertation
 

Pollutants leached from selected species of wood in log storage waters

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  • A study was conducted to determine the quantity and character of substances leached from logs floating in water, and the rate of leaching of these substances. The species of wood studied were Douglas fir and ponderosa pine. The research was carried out in a controlled laboratory environment with log sections 14-inches in diameter by 20-inches long. The study included log sections submerged in both tap water and saline water. The holding water was chemically poisoned to prevent biological degradation of the leached materials. The analyses performed on samples of the holding water taken at specified intervals during 40 day leaching periods included chemical oxygen demand (COD), Pearl-Benson Index (PBI), total solids (TS), total volatile solids (TVS) and total organic carbon (TOC). The data showed that ponderosa pine logs contributed measurably greater quantities of soluble organic materials and color-producing substances than Douglas fir logs. The following COD and PBI values were measured after a leaching period of 20 days: ponderosa pine - 4.3 g COD/ft², 15 g PBI/ft²; Douglas fir - 3.2 g COD/ft², 11 g PBI/ft². Leaching rate appeared to be affected by the concentration of soluble organic materials in the stagnant holding water; however, experiments showed that, in flowing water, the leaching rate was nearly constant. Extrapolation of the laboratory test data to field conditions resulted in an estimate of nearly 800 pounds of COD per day contributed by approximately 8 million board feet of floating logs to a typical log storage water.
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