Studies on Organic Substances in Leachate from Landfills:—Extractable Organic Substances from Polyvinyl Chloride Sheets—

概要

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A variety of substances are supposed to be in leachate from solid waste landfills and suitable treatment of leachate is necessary for environmental security. Extractable substances with water, from polyvinyl chloride sheets for seepage control work, have been examined and the following were identified in the extract : dibutyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) as plasticizer, Tinuvin P as UV light absorbent, Bisphenol A as antioxidant, and palmitic acid and stearic acid as lubricant and stabilizer. Furthermore, all of these organic substances were actually detected in leachate from landfills where polyvinyl chloride sheets were usedfor seepage control work, although it is not clear whether these organic substances were extracted only from sheets.<BR>The Extraction pattern of DEHP as plasticizer from polyvinyl chloride sheets was also examined, and it was confirmed that additives such as DEHP, which is barely soluble in water, mostly came off the surface of polyvinyl chloride sheets due to mechanical action by water, rather than by solubilization in water.