AWWA JAW36202

Plain sand was compared with iron-oxide-coated sand as a medium for filtration. The coated sand has a positive surface charge at neutral pH, whereas uncoated sand is negatively charged under similar conditions. The influent to the filters contained either latex particles, which were negatively charged in all solutions investigated, or ferrihydrite particles, which were negatively charged at pH > 5 but positively charged at lower pH values. The coated medium outperformed the uncoated one in most experiments, a result that is consistent with expected electrostatic interactions. Includes 27 references, tables, figures.

Product Details

Edition:

Vol. 86 - No. 8

Published:

08/01/1994

Number of Pages:

14

File Size:

1 file , 26 MB