FROM: James D. Herberg, General Manager
Originator: Riaz Moinuddin, Director of Operations and 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: Recommend to the Board of Directors to:
Approve a Sole Source Purchase Order Contract to Carbon Activated Corporation to change out granular activated carbon media for Biogas Cleaning Systems at Plant Nos. 1 and 2 Central Generation (Cen-Gen) Facility, for a total amount not to exceed $236,500 through June 30, 2022.
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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 result in damage to 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 used as the primary tank for roughing and the second vessel is used for polishing the residual compounds from the biogas. The third vessel at Plant No. 2 is used as a standby vessel. Each vessel has three layers of activated carbon media with different specifications to remove targeted components from biogas. OC San has many years of experience with the different kinds of granular activated carbon specifications and has determined the recommended mix provides the necessary contaminate removal for the longest period. Other mixes or specifications have been found to become exhausted or ineffective much more quickly.
The Board of Directors approved a contract to EnviroSupply & Service Inc. in May of 2020 to supply the specified granulated activated carbon change outs. Envir...
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