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Bidjugde
JOB
(DESIGN BUILD) Water Reclamation Facility Effluent Filter
BID DATE
09/21/20 - 10:00
AGENCY
El Mirage
ESTIMATE
$5,000,000
SCOPE
Project design to integrate one (1) Tertiary disc treatment filter capable of meeting industry-standard hydraulic loading. (3 – 6 gpm/sq ft for average day and PDF’s.) The existing three (3) tertiary disc treatment filters are functioning at 50% design limiting the amount of influent flow capacity to 2.0 mgd. After review, the filter manufacturer “Aqua-Aerobic” representative IES Southwest, Inc. has verified the current operational and maintenance practices meet the manufacturer O & M specifications. IES Southwest also recommends the current SER line be routed to the headworks reducing the loading on the existing and proposed additional filter. • Site and Structural evaluation and modifications (Deck Support) • One (1) filter control cabinet designed to operate the new filter in Local/Remote mode • Each filter to include new like level indicators, pressure differential indicators, like flow metering including influent, effluent control valving and associated new air/electrical piping • Each filter to include like process controls, alarms, real time process indicators integrated into the existing Wonderware SCADA software • Associated electrical improvements • Filter effluent disinfection methods of application upgrade. The existing disinfection application point needs to be relocated. Short circuiting along with slow reaction times are being experienced. Forty-five (45) minute to sixty (60) minute reaction times are common, causing over and under feeding of disinfectant. The recommendation is to improve the mixing by injecting the chlorine into a common pipe upstream of the clear well. This can be accomplished by combining the four (4) filter discharge piping into a single header. The existing piping can be combined with some straightforward modifications. This modification would ensure that all filter discharge would become completely mixed with chlorine prior to entering the Clear Well. This would improve the disinfection capabilities of the facility, and better utilize the existing contact basin and piping to ensure sufficient disinfection at the rated plant capacity. • Installation of a Secondary Effluent Recycle (SER) line. This SER line would return to the influent pumping station (Headworks) stopping recycle through the filters, reducing filter loading and overflow while reducing sediment build up within the surge tank. Aqua-Aerobics Director of Product Management also recommends that the existing filter overflow piping (SER) be reconfigured to send these solids back to the head of the plant where they can be removed in the secondary process. o 16” recycle line to influent station, 160 LF o Associated valve and valve controls • Provide future influent/effluent pipe connections for EQ basin. The future EQ basin will allow for high flow periods, improved process treatment and effluent water quality o Spooled valved blind flange for future process influent piping vojeda@elmirageaz.gov
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