size. Therefore, there is no need to keep the
ceedings of the XIIth International Congress of Refrig-
eration. Washington D.C., vol. 1, p. 739743.
sludge frozen beyond the freezing time, so that
Kawamura, S. and R.R. Trussell (1991) Main fea-
the thawing process can begin as soon as the
tures of large water treatment plants in Japan. Jour-
sludge exits the freezer.
nal of the American Water Works Association, June, p.
Knocke W .R. and P. Trahern (1989) Freezethaw
American Water Works Research Foundation
Water Research, 23(1): 3542.
Report with Keuringsinstituut voor Waterleiding-
Martel, C.J. (1988) Development and design of
artikelen, American Water Works Association,
sludge freezing beds. USA Cold Regions Research
and Engineering Laboratory, CRREL Report 88-20.
Benn, D. and P.W . Doe (1969) The disposal of
Martel, C.J. and C.J. Diener (1991) A pilot-scale
sludge by the freezing and thawing process.
study of alum sludge dewatering in a freezing
Filtration & Separation. July/August, p. 383389.
bed. Journal of the American Water Works Associa-
tion, 83(12): 5155.
Brown, G.N., K.B. Kirwan, G.J. Englehardt, and
J.R. DeWolfe (1993) Mechanical freeze/thaw con-
Randall, C.W. (1978) Butane is nearly `ideal' for
ditioning of water works residuals pilot study,
direct slurry freezing. Water and Waste Engineer-
Project Report to Municipal Water & Wastewater
ing, 15(3): 4349.
Treatment Electrotechnology Committee, Electric
Randall, C.W ., M.Z. Ali Khan, and N.T. Stephens
Power Research Institute, Miami, Florida.
(1975) Waste activated sludge conditioning by
DeWolfe, J.R. and B.A. Dempsey (1992) The effects
direct slurry freezing. Water Research, 9: 917925.
of land applied water treatment residuals on soil
Sanks, R.L. (1978) Water Treatment Plant Design.
phosphorus. In Proceedings of the ASCE Water Fo-
Ann Arbor, Michigan: Ann Arbor Science.
rum, Baltimore, Maryland.
Sewerage Commission of the City of Milwaukee
Egan, C.J. and H. E. Davis (1982) Concentration of
(1971) Evaluation of conditioning and dewater-
black liquor by freeze-crystallization. Proceedings
ing sewage sludge by freezing. NTIS PB-213-122,
of Technical Association of the Pulp and Paper Indus-
U.S. Department of Commerce, Springfield, Vir-
try, San Francisco, 1316 September 1982. Book III,
Vesilind, P. A. (1990) Sludge freezing in shallow
Farrell, J.B. (1971) A status report on the utiliza-
layers. ASCE Journal of Environmental Engineering,
tion of freezing in dewatering of sludges. In Pro-