Looking to improve the marketability of the biosolids generated at its 144 mgd Plant No. 2 in Huntington Beach, Calif., the Orange County Sanitation District is moving forward with the design of a $300 million temperature-phased anaerobic digestion facility. Consisting of six thermophilic digesters and six batch tanks, the new TPAD facility will produce Class A biosolids, which are treated at higher temperatures and capable of being used for land applications, unlike the current Class B biosolids produced by the district. The new facility will also increase the district’s system resiliency in the event of a major earthquake.
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