About CHENG C-Y
About Univ. Porto, Porto, PRT
About RIBAROVA I
About Univ. Arch, Sofia, BGR
About Water Science & Technology
About waste water treatment
About activated sludge process
About Biological treatment of sewage and wastewater
About 排水
About 水質
About 活性スラッジシステム
About モデリング
About シミュレーション