Shimizu Corporation: Successful defoliant-contaminated soil purification in Vietnam: Dioxin contamination
2020.12.08
Shimizu Corporation:
Vietnam Environmental Treatment Technology Center (CTET):
With the approval of the Defense Ministry of Vietnam, we verified the effectiveness of the technology for cleaning and treating dioxin-contaminated soil derived from defoliants.
Conducted twice in 2019 and 2020 at Bien Hoa Air Force Base in Dong Nai Province.
Announcement of cleaning treatment results:
Today, we are announcing the results at a hotel in Hanoi, inviting government officials from Vietnam and the United States.
Shimizu Corporation’s contaminated soil cleaning technology:
It was developed and put into practical use by Shimizu Corporation.
We have a track record of processing millions of tons in Japan.
Dioxin Contaminated Soil Purification Project:
We verified the effectiveness of the technology for highly contaminated soil.
A soil cleaning plant to be actually used is set up in Bien Hoa Air Force Base.
Approximately 900 tons of contaminated soil was washed and treated by a demonstration experiment.
Installation plant:
Operates 8 hours a day 30,000-37,500 m3 / year,
16 hours a day operation 65,000-80,000m3 / year
Soil cleaning treatment is possible.
Our cleaning technology utilizes “the characteristic that pollutants adhere to the fine particles of soil”.
Bien Hoa Airport Soil:
Since it contains 30-35% of fine particles, 65% -70% of soil can be reused.
Hazardous substances removed together with the fine particles are separately detoxified by thermal decomposition treatment.
In the demonstration experiment:
For example, for soil with a dioxin concentration of 3,500 ppt, we were able to reduce it to 100 ppt or less (removal rate of 95% or more).
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https://www.shimz.co.jp/company/about/news-release/2020/2020043.html