In pilot-scale studies using slow sand filters fed from a natural river source, a layer of crushed
dolomite limestone within the filter column was tested for increases of effluent pH and
alkalinity, and horizontal-flow roughing filters containing basaltic river rock and calcite
limestone media were compared for water chemistry changes and turbidity removal during clay
challenge studies. A calcite-amended rock roughing filter in combination with slow sand
filtration enhanced effluent alkalinity, and this pretreatment filter system produced effluent
compliant with the 1 ntu turbidity regulatory requirement for potable water. The dolomite layer
amendment increased effluent pH, alkalinity, and Saturation Index during a sixty-day study, and
mineral service life appears acceptable for engineering applications. Includes 17 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 370 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 10/01/2003 |
