This powerpoint presentation begins by presenting study objectives that include
evaluating the following technologies for the removal of
taste and odor (T&O) compounds, specifically MIB,
using bench scale testing:
Powdered Activated Carbon (PAC) Jar Tests; Granular Activated Carbon (GAC) Rapid Small-Scale Column
Testing;
Ultraviolet Advanced Oxidation Process (UV AOP); and,
Ozonation Advanced Oxidation Process (Ozone/H<sub>2</sub>O<sub>2</sub>). Pac testing matrix produced the following conclusions:
calgon WPH carbon performed best;
chlorine will reduce PAC performance by at least 10-20%;
moving chlorination downstream of PAC application will
improve MIB removal
downstream of clarification,
on top of filters and
at clearwell entrance; and,
a secondary treatment system is needed to achieve an MIB
finished water target level of 5 ng/L. UV AOP testing produced the following conclusions: UV AOP showed over a 99.999% (5 log) reduction in MIB;
other water quality parameters
were not impacted (TTHM, HAA5, turbidity, alkalinity, and iron);
use of UV AOP resulted in a small increase in AOC concentration;
UV AOPs need to be located downstream of filtration; and,
quenching of peroxide residual is necessary. Ozonation AOP testing produced the following conclusions: AOC levels increase as ozone doses increase, and
would require biological filtration using granular media;
ozone alone can reduce MIB to very low levels;
ozone should be located upstream of filtration
in order to remove AOC; and,
would expect about 5% improved performance
with peroxide. Granular Activated Carbon (GAC) Rapid Small-Scale Column
Testing (RSSCT) produced the following conclusions: Calgon F400 performed best;
modifying current filters for use as GAC filter adsorbers would
not be practical because TOC pre-loading greatly impacts the
ability to remove MIB, and at least two change-outs of GAC would
be needed per year, with one change-out happening right
before T&O season;
post-filter contactors, operated seasonally, would provide
required taste and odor removal
used in combination with PAC, EBCT = 7 min and
without PAC, EBCT = 15 min; and,
operated for 90 days of the year when taste and odor
events are expected to occur. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 29 |
| Published : | 11/01/2008 |
