Low-pressure membrane systems depend on an automated backwash
process to dislodge particulate build-up on the membrane surface.
Although membrane manufacturers have different backwash
procedures and intervals, all utilities are faced with disposal of this
water. In many cases this backwash water can be re-treated through a
separate membrane system to produce an effluent quality equal to that
of the primary system. Additionally, by adding a secondary treatment
system, the overall plant effectiveness is increased and costs for
disposing backwash water are reduced.
California's Department of Health Services (DHS) currently does not
have regulations for processing membrane backwash water and relies
on conventional treatment system criteria. The membrane process
used at Carmichael Water District (CWD) does not require chemical
addition to aid in filtration, which greatly differs from that found in
conventional processes and permits re-treatment options.
In June 2001, CWD embarked upon a program to demonstrate the
viability of its treated backwash water as acceptable drinking water and
aid the local regulatory agency in their decision to consider secondary
filtrate for potable use.
This paper examines the relationships of finished water quality
parameters for the primary and secondary stage filtration under fullscale
operational conditions. Includes 6 references, tables, figure.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 200 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 03/05/2003 |
