The Dublin San Ramon Services District (DSRSD) must export secondary effluent
from its Regional Wastewater Treatment Facility in Pleasanton, California, via
the Livermore-Amador Valley Wastewater Management Agency (LAVWMA) pipeline to the
San Francisco Bay located 25 miles away. Due to increasing wastewater flows and
capacity constraints in the LAVWMA export pipeline, DSRSD implemented its Clean
Water Revival project as a method of disposing a portion of its peak wet-weather
flows. The goal of the Clean Water Revival project is to produce recycled water
for indirect potable reuse at their Regional Wastewater Treatment Facility. The
Clean Water Revival project consists of the advanced treatment of municipal
wastewater secondary effluent to produce a 2.5 million gallons per day (mgd)
(2,800 acre-feet per year) demineralized recycled water source for potable
groundwater replenishment of a potable water supply. The $10 million advanced
water treatment (AWT) facility was commissioned in March 1999. The facility's
processes consist of a microfiltration and reverse osmosis integrated membrane
system, followed by ultraviolet light disinfection. The AWT processes are
designed to achieve the minimum 5-log virus removal requirement for tertiary
treatment processes stated in the California Department of Health Services (DHS)
"Draft Water Recycling Criteria" and to produce a high quality product water low
in turbidity, total dissolved solids, and total organic carbon. Although DHS
recommended approval of this project in July 1998, public opposition to the
project has prevented the District from being able to deliver water to
groundwater injection wells. Part of the public's concerns have focused on
whether the product water is safe and whether the treatment processes can
continually produce water that meets the regulatory requirements. The multiple
barrier design approach of the AWT, and the installation of continuous online
monitoring of various water quality constituents help to address these concerns.
Verification of the AWT facility's water quality was also conducted during a
16-week performance testing program immediately after the commissioning of the
facility. This paper discusses the design features of the AWT facility, including
reliability aspects of the installed equipment and water quality monitoring
equipment and controls, and the performance of the facility to date. Includes 4 references, tables, figure.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 200 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 01/01/2000 |
