AWWA JAW6691

Direct filtration has been used as a viable alternative to complete, conventional treatment systems that employ flocculation-sedimentation prior to filtration where the raw water source is relatively unpolluted and is low in color and turbidity. By adding a polymer to the water to be used for filter backwashing, a reduction of the initial turbidity breakthrough period and peak can be obtained in addition to a much improved settling-thickening rate for the backwash solids. Another advantage of this treatment is the reduced discharge of wastewater when relatively clear supernatant from clarifiers is returned to the front of the treatment train. Presented are results from pilot-plant tests that incorporated polymer feeding. Includes 14 references, figures.

Product Details

Edition:

Vol. 74 - No. 8

Published:

08/01/1982

Number of Pages:

3

File Size:

1 file , 1 MB