About YOKOTA YUJI
About 北海道工開試
About ISHIZAKI KOZO
About 北海道工開試
About TANAKA SHIGENOBU
About 北海道工開試
About MATSUYAMA HIDETOSHI
About 北海道工開試
About 水質汚濁研究(日本水環境学会)
About waste water treatment
About activated sludge process
About Biological treatment of sewage and wastewater
About 石炭
About 排水
About 有機化合物
About 微生物分解性