Soil and Groundwater Contamination Survey and Countermeasure Technologies

Category of Tchnology	Treatment	Treatment
Media	Groundwater
Contaminants	Volatile Chlorinated Organic Compounds (TCE, PCE, etc)
	Applied (Demonstrated) Substances	Trichloroethylene, tetrachloroethylene
Scope	Concentration Range	50 mg/l
	Hydrogeological Conditions	-	-
	Chemical Soil Properties
	Other Remarks
Technology Description	Classification	Decomposition
	Status	Under Demonstration Soil and Groundwater Countermeasure Test Study (Performed 1997)
	Outline of Technology	After adding hydrogen peroxide, expose the groundwater contaminated with VOCs to the constant radiation of ultraviolet ray to decompose the VOCs, and remove the residue hydrogen peroxide by catalysts.
	Required Pre- and Post-treatment
	Enhance Effectiveness through Combination
	Case History	A continuous processing of the groundwater containing 300 µg/l of tetrachloroethylene (flow speed at 1 to 1.2 m3/hour) by adding 25-30 mg/l of hydrogen peroxide and exposing to the ultraviolet ray generated by 6 kw of electricity has done.  The treated water has kept below 3 µg/l of tetrachloroethylene for 3,000 hours.
	Application Examples
	Limitations
	Properties of Treated Soil	-
Schematic Flow Process	Devices for Continuous Decomposition under Ultraviolet Ray
Applicability	In Situ Applicability	Possible
	Ground Structures	-
	Required Excavation
	Groundwater Extraction	Necessary.
	Required Space	Space sufficient for the installation of the devices.
	Operational Time
	Installation Time
	Maintenance and Control Requirements	Control of the hydrogen peroxide added to the water
	Additional Remarks
Secondary Impacts to Environment	Secondary Treatment Required?	Effluent Water Treatment
	Effects on Living Environment
	Additives	Oxidants/ Reductants
	Possibility of Contaminant Spreading	Treatment of the residue hydrogen peroxide
	Secondary By-products	Trichloroethylene and cis-dichloroethylene.

• 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