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Hallimond Tube를 이용한 토양내 P.A.Hs 제거연구
권혁,김홍웅,박규홍 중앙대학교 건설환경연구소 2001 環境科學硏究 Vol.12 No.1
Soil washing or dredged processing is a water-based volume reduction process for mechanically scrubbing a contaminated soil to remove contaminants. In this study, the froth flotation was applied to clean contaminated soil containing poly nuclear aromatic hydrocarbons (P.A.Hs) using a modified Hallimond tube devised by Mulleneers et al. (Colloids and Surfaces A: Physicochemical and Engineering Aspects 151, 293-301, 1999). The effects of air flowrate, particle sizes, and the concentration of frothers such as sodium dodecy1 sulfate on the flotation performance were investigated. Overall recovery was increased with air flowrate and hydraulic entrainment seemed occurred when air flowrate was greater than 1.5 1/min. The highest recovery of 60 to 70% was obtained when 16ml of sodium dodecy1 sulfate was used at 15% of solid concertration in feed. Concentration effect observed in three minutes after the beginning of the experiments was relatively significant at the range of 20 to 150 microns of soil particles. Removal efficiency of phenanthrene was greater than that of naphthalene in case of 180 microns of particles. The first order reaction rate constant of phenanthrene was estimated as 0.12 min-1 using less than 74 microns and 0.21 min-1 using 177 to 300 microns of soil particles. Concentration effect of a more contaminated soil through flotation process will also be helpful in reducing the volume to be treated and the residence time of reactors in the following biological treatment or bioleaching process.