1. [1] Ministry of the Environment, Government of Japan. Press release on the 8th November, (2005). [in Japanese].
2. [2] Wei Y, Van Houten RT, Borger AR, Eickelboom DH, Fan Y. Minimization of excess sludge production for biological waste water treatment. Water Res; vol.37, no.18, pp.4453-4467 (2003).
3. [3] Ide T. Water treatment engineering, Tokyo: Gihodo Shuppan (1990) [in Japanese].
4. [4] Editors: Eckenfelder WW, Grau P. Activated sludge process design and control: Theory and practice, Lancaster: Technomic Publishing Co. (1998).
5. [5] Miyoshi Y. Ideas and techniques of sewage and wastewater treatment, Tokyo: Ohmsha;. pp.55-169 (2006) [in Japanese].