Water utilities are facing the challenge of providing higher levels of
disinfection while having to lower concentrations of disinfection byproducts. A key
factor for meeting these goals is the removal of naturally occurring organic matter
(NOM). One alternative that has emerged is a magnetized ion exchange (MIEX) process.
It has been demonstrated to be highly effective in removing both low and high molecular
weight dissolved organic carbon (DOC) fractions from a range of waters, and works well
in conjunction with coagulants for removal of a broad range of organic weight fractions.
This process can be applied as a series of mixed contactors to treat raw water ahead of
coagulation. The resin is magnetized to facilitate recovery in a settling compartment that
is located downstream of the contactors. Most of the recovered resin is returned to the
contactors, but a portion is regenerated to provide a steady state condition under which
ion exchange capacity can be maintained in the system. A small fraction of fresh resin is
added to compensate for any losses. This project provides an evaluation of the
performance of the MIEX process under widely different conditions. Effect on removal
of NOM and control of disinfection byproduct formation are examined along with
assessments of the effects on selected inorganic constituents that include bromide,
sulfide, arsenate, arsenite, and perchlorate. Interaction with other plant elements that
include disinfection and coagulation-based processes is another critical area that was
assessed.
Evaluations for this work are a part of an AWWARF study to investigate the
effectiveness of the MIEX process in source waters with a wide range of characteristics,
such as high DOC - low alkalinity, high DOC - high alkalinity, medium DOC - medium
alkalinity, and low DOC - high alkalinity. Bench and pilot scale testing is being
conducted at various utilities to provide these assessments. Includes 8 references, table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 410 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 11/02/2003 |
