This powerpoint presentation begins by providing a brief overview of modified slow sand filtration. Two methods of predicting the performance of
modified slow sand filtration are presented, including:
bench-scale studies that are generally used to
predict equipment performance; and,
physical and chemical treatment that is
relatively easy to evaluate on benchscale. An example of ozone-assisted biofiltration at the First Nation (Aboriginal) Community in
Northern Ontario, Canada, is provided and includes the following:
raw water with high (> 20 mg/L) DOC
& Color (85 TCU);
poor historical raw water quality
information; and,
bench-scale method used before
incurring the expense of a pilot trial; ozone applied at O<sub>3</sub>/DOC ratios of 0.5
up to 1.5 (0.5 mg O<sub>3</sub> per mg DOC),
ozone dosages ranged from 5 to 30 mg/L; and, samples analyzed for
DOC, BDOC, color, UV254, SUVA, general chemistry, bromate. Results of bench-scale study included the following:
15 - 27% of the DOC mineralized by
ozone; 33 - 36% of the remaining DOC
converted to BDOC; and,
potential for > 57% DOC removal IF
biofiltration can remove 100% of BDOC. Includes table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 32 |
| Published : | 11/01/2008 |
