This powerpoint presentation outlines a pilot scale filter study at the Greene County, Ohio, South Plant. A brief overview of background information is provided, including: more than half (28 µg/L) of the arsenic entering
filter is soluble;
more than half (23 µg/L) of the arsenic entering
the filter is in As(III) form;
unexpected and unexplained removal of arsenic
through filter, no strong oxidant;
As(V) dominates filter effluent; and,
complete nitrification takes place in filter. Objectives of the study included: determine what was happening to the arsenic in the filter; determine the
impact of replacing existing filter media on
arsenic removal and ammonia oxidation; and, determine
the best way to bring new filters on-line to
achieve previous biological activity. Key pilot study conclusions:
microbiological accumulation and complete nitrification
(NH3 - NO3) was achieved in all pilot filters by 71 days;
no significant difference between methods of seeding
columns;
significant oxidation of As (III) to As (V) occurs during
filtration (greater than 80% of soluble As (III) ) shortly
after start-up;
filtration removes greater than 75% of total arsenic
(presumably by iron adsorption of As [V]);
residual arsenic is predominantly in the form of
soluble As (V); and,
iron was effectively removed by pilot system at start-up. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1000 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 23 |
| Published : | 11/01/2007 |
