Soil and Groundwater Contamination Survey and Countermeasure Technologies

Category of Tchnology	Treatment	Situ Extraction Technology
Media	Soil, Groundwater, Soil Gas
Contaminants	Oil (Non Volatile Hydrocarbons)
	Applied (Demonstrated) Substances	Heavy Oil C
Scope	Concentration Range
	Hydrogeological Conditions	-	-
	Chemical Soil Properties
	Other Remarks	Allows effective removal of PAHs (asphaltene) that is difficult to treat
Technology Description	Classification	Separation
	Status	Under Demonstration Soil and Groundwater Countermeasure Test Study (Performed 1996)
	Outline of Technology	Micro bubbles generated by micro bubble generator, entrain oils from the highly contaminated soil with addition of alkali reagent to accelerate the separation
	Required Pre- and Post-treatment	Wastewater and sludge treatment
	Enhance Effectiveness through Combination	Bioremediation
	Case History	Oil-content was reduced from 4 to 0.5%.
	Application Examples	This method was used for remediation work
	Limitations	The efficiency of removal would be lower under below conditions;   soil with high organic content  low temperature
	Properties of Treated Soil	Properties are Generally Retained
Schematic Flow Process	Fig. Schematic Flow Process
Applicability	In Situ Applicability	Possible
	Ground Structures	-
	Required Excavation	It is necessary for this method to excavate whole contaminated soil
	Groundwater Extraction	None
	Required Space	4.5m x 3.0m x 2.7m (for pilot scale plant)
	Operational Time
	Installation Time
	Maintenance and Control Requirements
	Additional Remarks	The pilot scale plant allows continuous treatment at 1 m3/hr.
Secondary Impacts to Environment	Secondary Treatment Required?	Effluent Water Treatment
	Effects on Living Environment
	Additives	Water Others (NaOH, H2O2, H2SO4)
	Possibility of Contaminant Spreading	None
	Secondary By-products	None

• Understanding the Contamination Survey and Countermeasure Technology Description Sheet
• Where to make contact

Soil Environment Management Division, Water Environment Department, Environmental Management Bureau, Ministry of Environment
Tel: +81-3-5521-8319
E-mail: MOE@env.go.jp