AWWA WQTC65903

The objectives of this powerpoint presentation include: improve granular media filtration using engineeredceramic media; evaluate operational robustness and dependency onchemical coagulation; establish baseline from which to continue furthermechanistic studies; and,evaluate microspheres as surrogates forCryptosporidium. A brief overview of granular media filtration is provided, along with the experimental approach that included: initial microsphere tests; uncoagulated tests on lake water;semi- and fully coagulated tests on lake water; and, arecovery study. Preliminary conclusions found that:compared to a conventional configuration,ceramic media can offerup to 1.25 log improvement in Cryptosporidium removal, and up to 1.5 log improvement in oocyst-sized microsphere removal;throughout the trials, particle counts andturbidity measurements were lower in effluentsfrom engineered media;correlation between microsphere andCryptosporidium counts must still beevaluated, but has potential for experimentsunder these conditions; engineered media may offer turbidity and particlereduction advantage with less chemical dependencyrelative to conventional filtration, long-termperformance must still be evaluated; and,coarse engineered media filtration head loss profilesare similar to those of conventional media butpreliminary tests suggest that the ceramic media'sgreater surface roughness allows it to retain moresolids than the conventional media. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2007

Number of Pages:

31

File Size:

1 file , 2.9 MB