DOWA ECO-SYSTEM is the premiere soil remediation company thanks to the synergy of experienced human resources, technological flexibility, and a well-developed infrastructure. Environmental risks are controlled by the most effective methods applicable to the specific task.

DOWA ECO-SYSTEM's Soil Remediation Operations

DOWA ECO-SYSTEM's Soil Remediation Operations can offer you comprehensive integrated services from investigation of site contamination, to remediation of existing conditions, to post-clean-up monitoring.

We will assess any and all hazardous conditions and environmental risks comprehensively and select the best treatment method, such as: soil washing, chemical/thermal decomposition, or biological decomposition (Bioremediation). We address contaminants of all sorts: not only heavy metals, etc., but also VOCs (Volatile Organic Compounds), from oil pollution to buried wastes and complex contamination.

Soil and Groundwater Contamination Investigation

Extensive Experience & Performance

• DOWA Group's Environmental Management division has conducted Site Assessments of Soil/Groundwater contamination in over 3,000 cases.
• Providing practical, precise and thorough consulting services with experience and know-how accumulated over many years.

Integrated Comprehensive Strength

• Integrated service system: comprehensive integrated services from investigation of site to remediation of existing conditions; to post-clean-up monitoring provides reliability, dependability and maximum confidentiality.
• Site assessment with a focus on the future design of remedial action plans.
• State-of-the-art simulation analysis by our geological specialists.
• Providing support for Risk Management.
• Expanding throughout Japan, and now also providing overseas investigation and services.

Decomposition by Iron Powder Designed for Soil Remediation (by the DOWA Group)

High Level of Remediation Performance

• Proprietary iron powder method for soil remediation that was developed and is continuously improved by DOWA ECO-SYSTEM.
• Effective using a small amount of iron powder applied directly to soil.
• Capable of decomposing cis-1,2-dichloroethylene (c-DCE) and dichloromethane, which are not easily degraded by conventional iron powder treatment.

DIM (Direct Iron Mixing) Method – Efficient Operation

• Uses a tri-axial auger; Iron powder mixing up to 60 meters below ground level
• Mixes soil and iron powder with air (preventing sludge-ing of the soil)
• Does not require berms

Soil Washing

• One of the largest soil washing plants in Japan (capacity: 50,000 tons per month.)
• Pretreatment permits remediation of soil with “complex contamination, such as mixtures of oil and VOCs”
• Nation's first certified “Contaminated Soil Treatment Plant”

Metal Recycling from Contaminated Soil

Shooting range lead bullet recycling

Recycling lead from bullet-containing shooting range soil

Various Additional Remediation Technologies

Pump and Treat

• A popular remediation approach that involves pumping contaminated groundwater to the surface and purifying the extracted groundwater through absorption of contaminants (petroleum). This method is more effective used in conjunction with Chemical Oxidation Treatment or Bioremediation.
• Increased effectiveness by using several techniques in combination.

Bioremediation

Bioremediation uses microorganisms to promote decomposition of oil and petroleum products.

This is a low-cost, low-energy method, applicable to low concentrations of biodegradable oil or petroleum products, using microbes to minimize harmful byproducts. There are several major types of bioremediation technologies: Landfarming, Biopiles for ex situ bioremedation, and Bioventing and Biosparging for in situ bioremedation.

In Situ Chemical Oxidation Technologies

In in situ oxidation, remediation is performed by injecting chemical oxidants into the contaminated soil in order to chemically decompose the petroleum products in the contaminated area. The effectiveness of this technology depends on the concentration level and chemical characteristics of the target contaminant.

Thermal Treatment – Safe Detoxifying Treatment

Mid-Temperature Thermal Treatment Method

• Mid-Temperature Thermal Treatment volatilizes oil by incinerating the soil at temperatures ranging from 750 °F to 930°F, to vaporize and degrade the petroleum substances, after which the remaining contaminants are then absorbed from the vapors.

High-Temperature Thermal Treatment

• Combustion of soil at more than 1,470°F.
• Effective for complex contamination
• Applicable for soil mixed with buried wastes

Contaminated Soil Remediation Facilities

DOWA ECO-SYSTEM operates Japan's first Certified “Contaminated Soil Treatment Plant” in compliance with Japan's “Soil Contamination Countermeasures Law,” in recognition of DOWA ECO-SYSTEM's outstanding experience and capability.

ECO-SYSTEM HANAOKA received the initial authorization in July 2003.

Only a few months later, in October 2003, DOWA ECO-SYSTEM group received the second authorization issued under the new law in Japan for their Akita plant (ECO-SYSTEM AKITA.)