FROM: James D. Herberg, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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SERVICE CONTRACT FOR PLANT NOS. 1 AND 2 CENTRAL GENERATION FACILITIES' CARBON MEDIA CHANGE-OUT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Service Contract to Carbon Bulk Sales LLC to install and dispose of activated carbon media for Plant Nos. 1 and 2 Cen-Gen Facilities, Specification No. S-2022-1289BD, for a total amount not to exceed $420,972 for the period beginning July 1, 2022 through June 30, 2023, with four (4) one-year renewal options; and
B. Approve an annual contingency of $42,097 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) Plant Nos. 1 and 2 Cen-Gen facilities use granular activated carbon to remove siloxane, volatile organic carbon (VOC), and sulfur compounds from digester gas. Removal of these constituents is necessary to meet air compliance standards and maintenance requirements. Specifically, failure to remove these compounds will damage both the reductive and oxidation catalysts necessary to control engine emissions.
Two vessels are used in series at Plant No. 1 and three vessels are used at Plant No. 2. The first vessel is the primary tank for roughing and the second vessel is for polishing the residual compounds from the biogas. The third vessel at Plant No. 2 is a standby vessel. Each vessel has three layers of activated carbon media with different specifications recommended by the system manufacturer to remove targeted components from biogas.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* 24/7/365 treatment plant reliability
* Protect OC San assets
PROBLEM
The granular activated carbon removes targeted contaminants from digester gas before utilizing the gas for combustion in the Cen-Gen facilities. The carbon media has a limited capacity to absorb the contaminants. When the carbon material is fully ...
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