The purpose of this study was to demonstrate the capability of a sludge-freezing bed for dewatering alum sludge. Alum sludge containing average total solids of 0.5 percent was applied to the pilot-scale bed and frozen in layers 2-10 cm thick over the winter of 1989-90. By the end of the winter, 99 cm of sludge had been frozen. After thawing and draining of meltwater, the depth of sludge remaining in the bed was reduced to 3-5 cm, a 96 percent reduction in volume. The remaining solids had a granular consistency similar to medium-sized sand. Column tests show that these granular solids could accumulate in the bed for several years before removal would be necessary. The author offers a number of advantages of freezing beds over freezing in lagoons or shallow drying beds. Includes 13 references, figures.
| Edition : | Vol. 83 - No. 12 |
| File Size : | 1
file
, 2.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 5 |
| Published : | 12/01/1991 |
