Bioremediation of Tsunami Affected Contaminated Soil in Tohoku, Japan
Publication: Geo-Extreme 2021
ABSTRACT
The Tohoku earthquake which was 9.0 magnitude mega earthquake caused a huge tsunami on March 11, 2011, in the northern part of Japan. This tsunami caused a great damage to the land area with high-salt content. A high content of salt in soil makes it unsuitable for crop production. Traditional method such as leaching with fresh water was expensive for a wide area and the discharge of saline water was another big challenge in the damaged infrastructure. In this study, a series of laboratory test was conducted to investigate the ability of bioremediation to reduce the salinity of soil samples. Saline soil was prepared after soaking the test soil in artificial seawater for three days and dried it to make it as a tsunami affected saline soil. It was then mixed with different microorganisms. Soil samples were collected to measure the electrical conductivity (EC), which is directly related to chloride content, regularly at different specified depths using a portable electrical conductivity meter. It was found that the electrical conductivity reduced with the help of the bacterial activities and the collective microorganism (CM 2) was more effective than the other microbes.
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Geo-Extreme 2021
Pages: 30 - 39
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© 2021 American Society of Civil Engineers.
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Published online: Nov 4, 2021
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