This slide presentation outlines a study on arsenic removal using a process of
Oxidation-Coagulation-Recirculation-
Filtration that includes:
oxidation of arsenic with liquid sodium
hypochlorite or solid calcium hypochlorite
tablets;
coagulation of arsenic with iron coagulant
selected for raw water characteristics;
recirculation of 10-30% of flow; and,
filtration, using a standard mix of sand, gravel,
and garnet in a media filter. Two case studies verifying the process are outlined and include:
ETV Study in Chelsea, Michigan of
silica and iron contaminates; and, a
plant trial in southwest Arizona of
high pH water and
silica and sulfate contaminates. A summary of results verified by the ETV
study include:
all operations performed by NSF;
all samples analyzed by NSF laboratory;
filtrate water averaged 3 ppb;
system found easy to operate and
required little maintenance;
estimated time to check system is minimal; and,
PLC set up so main parameters can be
monitored without a site visit. A summary of results for the Arizona study include:
system monitoring equipment works well;
unit design is conservative and can handle
increases in flow;
for a 30 day trial effluent arsenic averaged
2.6 ug/l; and,
process was able to remove arsenic to
below 8 ug/l with an iron dose of .48 ppm. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 410 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 27 |
| Published : | 06/01/2006 |
