AWWA ACE56186

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.

Product Details

Edition:

Vol. - No.

Published:

06/16/2002

Number of Pages:

17

File Size:

1 file , 650 KB