Agenda Item Wording:
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Water Reclamation Facility (WRF) - Belt Filter Press Dewatering Unit Rental - Authorize the City Manager to award an emergency contract to Aspen Rentals of Angleton, TX in the amount of $349,868 for the 24-month rental of a belt filter press dewatering unit. Also, authorize the appropriation of $360,000 from the Wastewater Enterprise Fund (431).
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Deadline for Action: 2/5/2023
Submitting Department: Public Works
Contact Name and Phone Number: Ben Litwack, WRF Superintendent, ben.litwack@visalia.city, 713-4671. Nick Bartsch, Public Works Director, nick.bartsch@visalia.city, 713-4052
Department Recommendation:
Staff recommends that Council authorize the City Manager to award an emergency contract to Aspen Rentals of Angleton, TX in the amount of $349,868 for the 24-month rental of a belt filter press dewatering unit. Also, authorize the appropriation of $360,000 from the Wastewater Enterprise Fund (431).
Background Discussion:
The Water Reclamation Facility (WRF) is equipped with two screw presses for dewatering that currently run 24 hours a day, 7 days a week, to keep up with demand. If either of the two screw presses or the conveyance system malfunctions, biosolids begin backing up through the system. If this backup occurs and is not addressed, critical operations throughout the Plant are affected and will ultimately cause the treatment processes to fail.
If the solids loadings coming into the plant remain as high as they've been over the past year and operational improvements are not made, eventually the solids concentrations in the Membrane Bioreactor (MBR) will climb to the point where adequate clarification isn't possible which will trigger a bypassing of the UV system and will put the WRF out of compliance until the problem is resolved. The increased biosolids concentration in the MBR will also lead to increased wear and tear, potent...
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