Pilot-Scale Subcritical Water Remediation of Polycyclic Aromatic Hydrocarbon- and Pesticide-Contaminated Soil

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• 作者：Arnaud J. M. Lagadec ; David J. Miller ; Alan V. Lilke ; and Steven B. Hawthorne
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：April 15, 2000
• 年：2000
• 卷：34
• 期：8
• 页码：1542 - 1548
• 全文大小：101K
• 年卷期：v.34,no.8(April 15, 2000)
• ISSN：1520-5851

文摘

Subcritical water (hot water under enough pressure tomaintain the liquid state) was used to remove polycyclicaromatic hydrocarbons (PAHs) and pesticides from highlycontaminated soils. Laboratory-scale (8 g of soil) experimentswere used to determine conditions for the pilot-scale (8kg of soil) extractions. Pilot-scale remediations of a PAH-contaminated manufactured gas plant soil (2200 ppmtotal PAHs ranging from naphthalene to benzo[ghi]perylene)with 275 mages/entities/deg.gif">C water reduced all low and high molecularweight PAHs to below detectable levels (<0.5 ppm) in aslittle as 35 min. In contrast, removals of higher molecularweight (mutagenic) PAHs were much poorer with eitherbioremediation for 1 year or supercritical carbon dioxideextraction. Subcritical water extraction at 250 mages/entities/deg.gif">C of 8 kg ofsoil contaminated with 70-400 mg/kg levels each oftrifluralin, atrazine, cyanazine, pendimethalin, alachlor,and metolachlor also removed all pesticides to below detectionlimits. While neither the PAH- or pesticide-contaminatedsoils could support plant growth before extraction, both soilswere fertile without additional treatment after extraction(based on germination of lettuce, radishes, and corn); andearthworm toxicity was reduced from 100% to 0%.