Goals for coagulation-based processes have undergone significant changes in terms of
objectives for lower turbidity and the inclusion of new objectives for TOC removal under
criteria for enhanced coagulation. These changes often require additional levels of
characterization and understanding for successful implementation of coagulation
adjustments as may be required at some locations. Coagulant dose and pH have long been
recognized as key treatment parameters that affect the capability to achieve goals for
coagulation. Response to these key coagulant conditions varies somewhat with water
quality thereby requiring characterization for each location. The inclusion of goals for
TOC as an objective results in a condition under which multiple objectives are being
targeted that now can include both TOC and turbidity. Capability to obtain effective
turbidity removal is essential to proper function of any clarification/rapid sand filtration
sequence and cannot be compromised. Therefore, it is essential that capability for
turbidity removal be established under any revised coagulation strategy that is directed
towards TOC removal. Multidimensional evaluations for assessing this expanded view
of the coagulation process are presented to illustrate the importance of identifying
coagulant dose and pH combinations that yield effective results for turbidity removal,
while improving the removal of TOC. Different treatment adjustments are available for
consideration, including changes in pH, use of alternative coagulant chemicals, and
changes in the order of chemical addition. Includes 3 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 650 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 17 |
| Published : | 06/16/2002 |
