Full Description

This powerpoint presentation begins by providing a brief overview of modified slow sand filtration. Two methods of predicting the performance ofmodified slow sand filtration are presented, including:bench-scale studies that are generally used topredict equipment performance; and,physical and chemical treatment that isrelatively easy to evaluate on benchscale. An example of ozone-assisted biofiltration at the First Nation (Aboriginal) Community inNorthern Ontario, Canada, is provided and includes the following:raw water with high ( 20 mg/L) DOCpoor historical raw water qualityinformation; and,bench-scale method used beforeincurring the expense of a pilot trial; ozone applied at Osub3/sub/DOC ratios of 0.5up to 1.5 (0.5 mg Osub3/sub per mg DOC), ozone dosages ranged from 5 to 30 mg/L; and, samples analyzed forDOC, BDOC, color, UV254, SUVA, general chemistry, bromate. Results of bench-scale study included the following:15 - 27% of the DOC mineralized byozone; 33 - 36% of the remaining DOCconverted to BDOC; and,potential for 57% DOC removal IFbiofiltration can remove 100% of BDOC. Includes table, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 32File Size: 1 file , 1.3 MB