AWWA ACE63121

This slide presentation outlines a study wheremathematical models were used to scale-down a full-scale adsorberto a rapid small scale column test (RSSCT) and maintain perfect similarity between performanceof the adsorbers.Advantages included:breakthrough curves (BTCs) can be obtained in a fraction of thetime;BTCs can be obtained with a fraction of the water; and,isotherm or kinetic studies are not required to obtain a full-scaleperformance prediction (unlike mathematical models: e.g., HSDM). Two RSSCT test approaches are outlined and include: constant diffusivity (CD), which assumes diffusivity is constant and independent of particle size; and, proportional diffusivity (PD), which assumes diffusivity is linear and dependent on particle size. RSSCT Summary includes:RSSCT test results, to date, have demonstrated RSSCTcan be a potential tool in predicting granular ferrichydroxide (GFH) bed life for arsenic (arsenate) removal;PD approach, overall, provides best simulation at lower,environmentally relevant, initial concentrations, andCD approach may be applicable under higher initialconcentrations;PD approach is applicable when internal mass transfer israte limiting; and,also applicable to other inorganic micropollutants (e.g.,phosphate) and other metal oxides (e.g., granular ferricoxide (GFO)). Includes figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

36

File Size:

1 file , 590 KB