AWWA QTC98292

The objectives of a study performed on three full-scale water treatment plants in France were to: quantify the health risk linked to Cryptosporidium for three surface resources and their associated treatments; assess the use of particle counters and turbidimeters as tools to evaluate and control filtration process operations; identify the potential for spores of aerobic bacteria to act as a surrogate for oocysts in the resources and during water treatment; and, define the best operational procedures in terms of particle removal reliability during normal and transitory operating conditions. The study was performed on three full-scale plants treating raw surface waters. On line sensors were installed on the raw and filtered waters including pH, temperature, flowmeter, turbidimeter (Hach 1720C analyzer) and particle counter (Met One 215W analyzer with six size channels from 1 to 300 um). Additional water quality parameters on the raw, settled, filtered, and final water were also analyzed including microbial counts (Giardia, Cryptosporidium, coliforms, clostridium and spores of aerobic bacteria). To evaluate the efficiency of the processes in terms of particle removals, data were collected on the 3 sites for different plant operation conditions, the impact of several operating parameters, including quick flowrate variations, coagulant dosage and filtration run time were evaluated.

Product Details

Published:

01/01/1998

ISBN(s):

0898679796

Number of Pages:

8

File Size:

1 file , 65 KB