Agenda Item: 15(d)
Prepared By: Jeffrey E. Poteet, General Manager, Water & Sewer
Business: City Council Item
Department: Water & Sewer
Subject:
Title
Authorize the Interim City Manager to Issue a Purchase Order to Aria Filtra - Trojan Technologies Corp. for Replacing 144 Microfiltration Membranes at the North Water Treatment Plant (NWTP) in the amount of $531,026.61 - Jeffrey E. Poteet, General Manager, Water & Sewer Department.
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BACKGROUND:
The North Water Treatment Plant (NWTP) treats raw surface water from the City's Source Water Facility using a lime softening process followed by a microfiltration membrane system. The NWTP is permitted to produce up to 6.67 million gallons per day (MGD) of drinking water and meets approximately 70% of the City's total potable water demand. After lime softening, the treated water is filtered through hollow-fiber membrane modules that remove turbidity, bacteria, Cryptosporidium, Giardia, and other particulate contaminants.
The NWTP's membrane filtration (MF) system consists of six (6) racks, each containing 72 membrane modules. Over time, these modules become fouled through normal operation, reducing permeability and limiting water production capacity. Membrane modules typically have a service life of approximately 8 to 10 years; therefore, annual funding for membrane replacement is included in the Water and Sewer Capital Improvement Program (CIP). Based on current performance and condition, 144 membrane modules, approximately eight years old, have reached the end of their useful life and require replacement. The replacement includes all necessary components to restore full operational performance, including the membrane modules, hoses, end caps, gaskets, nuts, and couplings.
Maintaining reliable performance of the MF system is essential to meeting community drinking water demands and ensuring the City's water supply remains stable and dependable. Pall Corporation is the original manufacturer of the existing memb...
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