Necessity of Toyosu and Brownfield Countermeasures - From November 2007 to the 2020s

Necessity of Toyosu and Brownfield Countermeasures - From November 2007 to the 2020s
At the former Tokyo Gas plant site in Toyosu, Koto-ku, Tokyo, benzene (10 mg/L), which is 1,000 times higher than the environmental standard, was detected. There are approximately 28,000 hectares of brownfields in Japan, with an estimated asset size of approximately 108 trillion yen, and in the 2010s, low-cost remediation technology developed by EBARA and DOWA Eco-System reduced remediation costs by 50%, leading to land reuse. After the Fukushima Daiichi nuclear power plant accident, about 12 million cubic meters of contaminated soil was treated in special decontamination areas, at a cost of about 2 trillion yen. 2020s saw an increase in the number of surveys, and by 2022, 982 out of 1576 cases were found to have contamination exceeding standards. Despite progress in new remediation technologies using nanoparticles and risk assessments, challenges remain, with remediation costs in rural areas reaching 30-50% of land prices. Sustainable urban development and land reuse are cri
tical.