Advances in chemical feed equipment provide options for cost-effective alkalinity addition that
were previously unavailable. In the past, carbon dioxide systems required deep basins and a
significant amount of reaction time to achieve stable water. Solution carbon dioxide feed systems
allow for instantaneous dissolution of "liquid" carbon dioxide and provide a means for
depressing the pH in an inexpensive and safe method which when used in combination with lime
addition can allow utilities to "dial-in" both the optimal pH for coagulation as well as provide a
significant increase in presoftened, coagulated, and finished water alkalinity. Carbon dioxide
addition in combination with lime prior to coagulation allows additional buffering capacity in the
coagulation process to minimize basin corrosion while providing an optimal enhanced
coagulation pH. Lime or caustic addition prior to media filtration or after membrane filtration
allows the shift in the carbonate species and stabilizes the water quality. Improved technology,
which provides faster reacting lime slurry allows for addition of lime after filtration, without
significantly impacting the turbidity of the finished water (depending on the water quality). Includes tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 730 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 11/01/2008 |
