This article presents results of a pilot plant study conducted to define optimum conditions for direct filtration at the Brasilia, Brazil, water treatment plant. The use of ferric chloride was found to offer advantages (longer filter runs and lower effluent turbidities) over the use of alum. The use of cationic polyelectrolytes to reduce the metal coagulant dosage was not found to be economically feasible. Preflocculation before direct filtration was determined to be unnecessary and possibly detrimental to performance. With a course filter bed, high backwash rates were required but with lower than normal total volumes of backwash water. Includes 8 references, tables, figures.
| Edition : | Vol. 78 - No. 7 |
| File Size : | 1
file
, 1.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 07/01/1986 |
