References
- American Public Health Association (APHA) . 1989 . Standard Methods for the Examination of Water and Wastewater. , 17th ed. , New York , NY : American Public Health Association .
- Brady , N.C. 1974 . The Nature and Properties of Soil , New York , NY : Macmillan Co. .
- Grappelli , A. and Tomati , U. 1989 . “ A microbiologist view on long‐term fertility ” . In Encyclopedia of Environmental Control Technology , Volume 3 , 623 – 656 . London , , England : Gulf Publishing Company .
- Rajan , V.R. , Lin , J.G. and Ray , B.T. 1989 . Low level chemical pretreatment for enhanced sludge solubilization. . Res. J. WPCF , 61 (11/12) : 1678 – 1683 .
- Sparks , L.D. 1989 . Kinetics of Soil Chemistry Processes , New York , NY : Academic Press, Inc. .
- Sposito , G. 1981 . Trace metals in contaminated waters. . Environ. Sci. Tech. , 15 (4) : 396
- Taylor , K.J. 1995 . Statistical Techniques for Data Analysis , New York , NY : McGraw‐Hill, Inc. .
- Thomas , A.H. 1950 . Graphical determination of B.O.D. curve constants . Water Sewage Works , 97 : 123 – 124 .
- Tyagi , R.D. and Coullard , D. 1989 . “ Bacterial leaching of metals from sludge ” . In Encyclopedia of Environmental Control Technology , Volume 3 , 623 – 656 . London , , England : Gulf Publishing Company .
- Vlyssides , G.A. , Loizidou , M. , Grivas , A. and Bouranis , D.L. 1997 . Thermal‐alkaline solubilization of activated sludge as pre‐treatment stage to anaerobic proccess . Water Res. , (accepted)