Increases in the population of the City of Ormond Beach, Florida (the City) placed increased demands on
the City's existing 8.0 mgd conventional lime softening WTP. Coupled with the anticipated deterioration
of raw water quality due to the intrusion and upconing of salt water, the City requested CDM to conduct a
pilot study and complete the preliminary and final design for a 4.0 mgd low pressure reverse osmosis (LPRO) expansion. Final design
was completed in 2006, construction activities for the LPRO expansion commenced in 2006, the system
was placed online in 2007, and all construction activities concluded in early 2008. A collaborative effort by the City, the FDEP, and CDM resulted in the successful permitting of an
innovative and sustainable method of disposing of up to 1.0 mgd of concentrate produced by the City's
LPRO expansion. This unique method of concentrate disposal provided for the blending of the LPRO
concentrate with reclaimed water at the City's WWTP. The most significant benefit associated with the
implementation of this disposal method includes the ability to reuse this previously unutilized resource
and augment the City's reclaimed water supplies. Furthermore, no portion of the City's WWTP capacity
was consumed, as concentrate blending occurs in the equalization basin downstream of all treatment
processes.
The past seven months of operation demonstrate the success of this innovative and sustainable
method of concentrate disposal. Blending the LPRO concentrate with the City's reclaimed water has
increased the City's supply of this resource by approximately 0.5 mgd. While the use of reclaimed water
is heavily affected by the amount of precipitation, approximately 80 to 90% of the LPRO concentrate is
reclaimed, and during periods of high reclaimed water demand, 100% of the LPRO concentrate is
reclaimed. While the TDS and chloride values of the blended reclaimed water have increased as a result
of concentrate blending, no adverse effects to the vegetation or soil structure have been observed.
This paper discusses the permitting efforts and challenges associated with the implementation of this
innovative method of concentrate disposal. Includes tables.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 11/01/2009 |
