This powerpoint presentation begins by providing a brief overview of Zone 7 of Alameda County Flood Control and
Water Conservation District and its three treatment facilities that serve the
Tri-Valley area (Livermore, California) that include: Patterson Pass Water Treatment Plant (WTP), 21.5 mgd;
Del Valle WTP, 36 mgd; and,
Altamont WTP, 24 mgd (in design). The purpose of evaluation was to:
identify options to optimize the ultrafiltration (UF) WTP
operation and more reliably meet its existing
capacity of 8 million gallons per day (mgd);
identify alternatives for increasing the UF WTP
capacity to 10-12 mgd; and,
identify improvements for the conventional
plant. The approach included:
a review of historical data;
an on-site evaluation of operation; and,
bench-scale testing. The issues identified included:
diurnal pH and temperature fluctuations;
algae growth in the Patterson Pass Reservoir and in the
solids contactor;
return of neutralized citric acid from the washwater
recovery system;
membrane feed water quality;
irrecoverable loss of membrane permeability;
DHS flux limit;
excessive backwash volume and reduced recovery; scheduling of backwashes, direct integrity tests, weekly
cleanings;
DIT fails to accurately predict broken fibers;
recent excessive fiber breaks;
weekly cleaning procedures include manual steps;
limited indication on HMI;
inlet and backwash valve failure; and,
originally-installed Asi-networked control units are no longer
available. Presentation conclusions indicate the following:
replacement of membranes have dramatically
improved reliability;
operations diligence has resolved many of the
issues;
now able to meet rated production of plant; and,
start-up conditions may have contributed to
membrane performance issues. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 37 |
| Published : | 11/01/2009 |
