CHANGES IN WATER POLLUTANT EMISSION FROM MIYAGI AND FUKUSHIMA PREFECTURES BEFORE AND AFTER THE GREAT EAST JAPAN EARTHQUAKE

To clarify changes in water pollutant loads from the land to coastal region before and after the Great East Japan Earthquake, we evaluated COD, TN, TP emissions from Miyagi and Fukushima prefectures in FY2010 and FY2012. Result indicated that COD, TN and TP emissions from sewage treatment plants in Miyagi Prefecture significantly increased 2.63, 1.24 and 1.93-fold, respectively, caused by the disaster damage. Consequently, total pollutant emissions from the whole domain in FY2012 became larger than that in FY2010 but these increments were 1–11% at most. This result suggested that the amount of water pollutant emissions in the basin at 1–2 years after the disaster almost recovered to the previous one.