Chemical Sludge Dewatering on Sand Beds

by John T. Novak, (A.M.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Missouri-Columbia, Columbia, Mo.,
Gail E. Montgomery, (A.M.ASCE), Engr.; Black and Veatch, Consulting Engrs., Kansas City, Mo.; formerly, Grad. Student, Dept. of Civ. Engrg., Univ. of Missouri-Columbia, Columbia, Mo.,

Serial Information: Journal of the Environmental Engineering Division, 1975, Vol. 101, Issue 1, Pg. 1-14

Document Type: Journal Paper


In this study the draining and drying rates of chemical sludges applied to sand beds were related to several sludge characteristics. It was found that the time to drain was related to the sludge specific resistance, applied depth, and solids concentration. Air drying occurred in two distinct phases. The initial or slow drying phase was governed by the sludge cake depth and drained solids concentration while the rapid drying rate was found to approximate the free surface water evaporation rate. Sludges with a coefficient of compressibility less than 0.7 were found to penetrate into the sand bed.

Subject Headings: Drainage | Chemicals | Sludge | Dewatering | Sand (hydraulic) | Sandy soils | Bed materials | Soil compression

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