As the elevation of Lake Mead decreases due to drought, the Southern
Nevada Water Authority (SNWA) has been challenged with addressing new water
quality issues. The SNWA can produce 750-MGD between two direct
filtration water treatment plants. The intake structures for these plants
have recently become more influenced by surface water than in past years
resulting in more particles, inorganic contaminants, organic matter, and
higher temperatures. Dissolved air flotation (DAF) was determined to be
a possible solution to resolve some of these issues. DAF could be
retrofitted into the existing hydraulic grade line of the plant while
minimizing the required footprint. A two-month pilot study showed DAF
coupled with enhanced coagulation could provide adequate total organic
carbon and arsenic removal. Another pilot plant study showed that
adequate algae removal could be achieved in order to extend filter run
times during high production periods. Overall, the SNWA has been
pleased with the results of these studies and has initiated a conceptual
level study to further investigate the feasibility of a DAF retrofit. Includes reference, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 530 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 17 |
| Published : | 11/02/2003 |
