Minneapolis Water Works (MWW) has been treating Mississippi River water for over
100 years. Two water treatment facilities operated by MWW provide water to
Minneapolis, Minnesota and adjacent cities. The treatment process has remained the
same since the 1940s and employs lime softening, powdered activated carbon (PAC) and
ferric-based coagulation and settling prior to filtration. MWW has embarked on a
program to ultrafiltration membrane filtration at both sites.
The raw water characteristics reviewed in this paper include variable temperature,
alkalinity and turbidity, although the pH remains fairly consistent. The temperature
variation of the raw water affects plant operations in many ways including reduced
treatment capacity at lower temperatures and occasional freezing of the lime softening
solids. Methods have been incorporated by the Minneapolis Water Works to handle the
raw water temperature variations, including operating at reduced capacity in the low raw
water conditions and feeding whiting (fine calcium carbonate solids). Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 460 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 8 |
| Published : | 06/01/2006 |
