About IWASAKI HISAYOSHI
About 水道機工
About KONDO YASUMASA
About 水道機工
About MURAKAMI TEIRYO
About ISHIKAWA MUNETAKA
About 下水道研究発表会講演集
About sewage treatment
About activated sludge process
About Sludge treatment and disposal
About Biological treatment of sewage and wastewater
About 電解法
About 余剰汚泥
About 基質
About 活性汚泥法
About 開発