About SAKAI YASUZO
About 環境浄化技術
About waste water treatment
About activated sludge process
About Sewage and wastewater treatment facilities
About Sludge treatment and disposal
About 有機性汚泥
About 減量化
About 余剰汚泥
About 磁化活性汚泥法
About 磁気
About 高濃度
About 汚泥
About 水処理