Taro Urase's Laboratory

Bisphenol A in leachates from solid waste disposal sites and its fate in treatment processes.

Micropollutants in leachate from Nonthaburi solid waste disposal site in Thailand by Taro URASE, Jiro TAKEMURA, Hiroyuki OKUMURA, Samerjai PANYOSARANYA, Chart CHIEMCHAISRI and Cheema CHOMSURIN

ABSTRACT J. of Japan Society on Water Environment, 30, 11, 617-620, 2007.

Micropollutants contained in leachates from the Nonthaburi open dump site in Thailand were investigated. The leachate contained as high as 5 mg/L of bisphenol A and 0.06 mg/L of toluene, while the concentrations of these compounds in the leachate from the Nakornpatom engineered landfill adjacent to the Nonthaburi site were between 1/100 and 1/1000 of those in the Nonthaburi site were observed for. It is suggested that the heat generated by the biodegradation of wastes promoted the release of the micropollutants from plastic wastes in the solid waste disposal site.

Factors affecting concentration of bisphenol A in leachates from solid waste disposal sites and its fate in treatment processes by T. Urase, K. Miyashita

ABSTRACT J. of Material Cycles and Waste Management, 5(1), 77-82, 2003.

Concentrations of bisphenol A (BPA) contained in landfill leachates from solid waste disposal sites were measured. The concentrations of BPA contained in leachates from industrial waste sites were in a range of ND to 2,800 micro-g/L, while those from municipal sites were in a range of 26 micro-g/L to 8,400 micro-g/L. The leachates from ash-rich sites contained relatively lower concentrations of BPA compared with organic-rich leachates. It is suggested that BPA concentration increases with time after the completion of reclamation in the case of ash-rich sites, whereas the concentration of BPA decreases with time in the case of organic-rich sites. A seven-years survey on a site in Japan showed neither a decrease nor an increase tendency in the concentration of BPA during ongoing reclamation. A leachate from a site in the Philippines contained high concentrations of BPA. A slight positive correlation was found between BPA concentrations and TOC. A major portion of BPA in leachates was found in dissolved and organic unassociated fractions, which cannot be precipitated by coagulation. More than 99.9% of BPA contained in the raw leachates was removed by the conventional series of treatment processes consisting of biological treatment, coagulation, sedimentation, sand filtration and activated carbon adsorption.

Keywords: Bisphenol A, leachate, solid waste, landfill sites, hazardous substances.