FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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SERVICE CONTRACT FOR PLANT NO. 1 THICKENING AND DEWATERING ODOR CONTROL CARBON CHANGE-OUTS, SPECIFICATION NO. S-2020-1155
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Award a Purchase Order Contract to Prominent Systems, Inc. for Plant No. 1 Thickening and Dewatering Odor Control, Carbon Change-Outs, Specification No. S-2020-1155, for a total amount not to exceed $122,758 for the period August 1, 2020 through July 31, 2021, with four, one-year renewal options; and
B. Approve a contingency of $18,414 (15%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) Plant No. 1 thickening and dewatering odor control facility is equipped with two activated carbon vessels/filter beds for polishing the foul air prior to stack emission. The carbon beds work in parallel (as one bed is down for service, the other is in use) to ensure all emissions from the thickening and dewatering process meet the South Coast Air Quality Management District (AQMD) permit and nuisance limits at all times.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* 24/7/365 treatment plant reliability
* Protect Orange County Sanitation District assets
PROBLEM
The thickening and dewatering facility produces very strong odors not only from the new thickening and dewatering centrifuges, but also from the sludge blending tanks, the truckloading bay, and the centrate wetwell. This complex foul air is treated at the dedicated thickening and dewatering foul air system which consists of three trains of chemical scrubbers followed by two activated carbon vessels. Tests have shown that to meet the AQMD permit and nuisance requirements, it is necessary to operate the two-stage chemical scrubbers in caustic-bleach mode followed by polishing activated carbon.
PROPOSED SOLUTION
To secure a Purchase Order C...
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