5Hall J E. Sewage Sludge Production, Treatment and Disposal in the European Union[J]. J CIWEM, 1995, 335 - 343.
6Campbell H W. Sludge management--future issues and trends [J]. Wat Sci Tech, 2000, 41 (8): 1 -8.
7P. Flyhammar: Estimation of Heaby Metal Transformations in Munisipal Solid Waste, Sci. Total Environ, 1997, 198(2) : 123 - 133.
8Liang Qiao: The Effects of Clay Amendment and Composting on Metal Speciation in Digested Sludge, Water Res. , 1997,31 (s) :951 - 964.
9webers H A A F, Visser M, 1991. strategies on sludge form,L Hermite p, treatment and use of sewage sludge and liquid agriculture wastes. London, elsevicr applied science, 34 - 35.
10J FITZPATRICK. Sludge processing by anaerobic digestion and superheated steam drying. Water Research, 1998,32(10) :2897 - 2902.
