Organic fluorine compounds, which have been pointed out to be harmful, were detected in the wastewater of the U.S. Navy base in Yokosuka City, Kanagawa Prefecture, at levels exceeding the national guidelines in May and July this year. I understand.
The US military is taking measures such as installing filters that absorb harmful substances.
In May this year, at the wastewater treatment facility of the US Navy Yokosuka Base in Yokosuka City, PFOS and PFOA, which have been pointed out to be harmful, were detected in excess of the government's provisional guideline values.
According to the city, when the U.S. military re-investigated two months later in July this year, it was below the guideline value of 50 nanograms per liter near the entrance of the two wastewater treatment plants on the base. , It means that it was detected at about twice the concentration near the outlet to the sea.
Although the cause is unknown, the US military explained to the Ministry of Defense that it would install an activated carbon filter that adsorbs harmful substances in the wastewater treatment facility and would treat the sludge on a regular basis.