References
- Fush , G. W. and Chen , M . 1975 . Microbial Ecol. , 2 : 119 – 138 .
- Grady , C. P. L. J. and Lim , H. C . 1989 . “Biological wastewater treatment theory and application” , Beijing : Chinese Architenture Engineering Press .
- Xu , Y. T. 1994 . Res. Environ. Sci. , 7 (5) : 1 – 6 .
- Corresponding author; email: [email protected]