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Today, we are facing to the increasing problems of treatment of soil highly contaminated by petroleum hydrocarbons. This may cause obstacles to land use or occasionally incur serious social problems. M icro-bubble entraining soil washing and bioremediation can be combined to form a technically and cost effective scenario to remediate the cotaminated soil.The efficiency of the combined remediation system was investigated through a laboratory treatability test and a pilot-scale test. A treatability test was conducted to determine the effectiveness of each treatment and collect information to support the design. The optimum H202 and NaOH concentration and removal ratio for soil washing were determined to design the pilot-scale test. Microbial degradation rates and oxygen demand rates for bioremediation were also determined. A pilot-scale test was conducted to evaluate the efficiency of the combined system performance in the field. Micro-bubble entraining soil washing system showed 90-95% removal raio with 30, 000-50, 000mg/kg oil contaminated soil. 170m3 of soil washing treated soil (maximum concentration 3000mg/kg) was treated by bioremediation with various types. The landfarming method was the most suitable for the site; the concentration decreased under 300mg/kg in 2 months.

DESIGN AND OPERATION OF MICRO-BUBBLE ENTRAINING SOIL WASHING AND BIOREMEDIATION IN CONBINATION TO REMEDIATE PETROLEUM HYDROCARBON-COTAMINATED SOIL