title: [Distribution patterns of PAHs in soils from coking plant and the particle-size cut points of soil washing].
abstract: Soil particle size distribution and contaminants distribution patterns in different soil size fractions are the basis of soil treatability using soil washing method. Soil particle-size cut points are important parameters of soil washing process. According to ex situ soil washing technology, soil samples were collected in a former coking plant. The soil particle size distribution and the concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in USEPA priority list were analyzed. Tween 80 and Triton X-100 solutions were used to clean the polluted soil with different particle size. Results showed that the total concentrations of 16 PAHs ranged from 6.27 to 40.18 mg/kg dry weight in the six soil size fractions and present a bimodal distribution. The maximum individual PAH concentration mostly occurred in the 250-500 microm size fraction. The lowest individual PAH concentration was in the 50-75 microm size fraction. The removal efficiencies of PAHs in different soil size fractions depended on their initial concentrations and the characteristics of soil. The PAHs removal efficiencies in coarser size fractions were lower than that in the finer size fractions owing to their higher organic carbon content. Based on the removal efficiency of PAHs in each soil size fractions by surfactant solution and the requirements of waste volume reduction, 50 microm was determined as the particle-size cut point. Then, 82.95% volume reduction can be achieved.
authors: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. lihelian2004@yahoo.com.cn
authors: He-Lian
authors: HL
authors: Li
authors: Jia-Jun
authors: JJ
authors: Chen
authors: Wei
authors: W
authors: Wu
authors: Xue-Song
authors: XS
authors: Piao
authors: Lin
authors: L
authors: Jiang
authors: Zhen-Tian
authors: ZT
authors: Shi
authors: Tian-Wei
authors: TW
authors: Sun
mesh_terms: D003077:Coke; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007220:Industrial Waste / Q000032:analysis*; D010316:Particle Size; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000302:isolation & purification*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D003077:Coke; D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants