This powerpoint presentation begins by presenting study objectives:
improve performance of 1938 softening
basins without major capital costs; and,
optimize chemical usage while meeting
water quality goals. A brief overview of the Minneapolis Water Works
Treatment System is provided, along with water quality treatment, turbidity issues in softening basins, bench testing to optimize chemicals, the impact of lime dose on water quality, the impact of alum dose on water quality, impact of ferric dose on water quality, dissolved organic carbon (DOC) removal with various chemicals, methods of natural organic matter (NOM) characterization, EEM analysis through Minneapolis
Treatment Plant, organic fraction removal
through treatment, THM formation potential, jar test conclusions, full scale testing to optimize
softening basin performance, coagulant mixing improvements, and sludge mixing improvements. Presentation summary indicates:
Lime Softening is an important treatment process for
hardness and TOC removal;
optimizing lime and coagulant doses maintain good
hardness and TOC removal, and minimize DBP
formation;
the old softening basin design is not optimum for
turbidity removal on river water;
increasing sludge wasting was the most effective
improvement, but limited by solids handling facilities; and,
evaluating the entire treatment plant to meet water
quality goals is essential. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 31 |
| Published : | 11/01/2009 |
