Encina Wastewater Authority's Innovative Management Plan for Class A Biosolids Pellets

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The Encina Wastewater Authority (EWA) recently upgraded the biosolids and energy management facilities at the Encina Water Pollution Control Facility (EWPCF) in Carlsbad, California. Biosolids processing improvements included replacement of existing dewatering equipment with centrifuges and the installation of a triple-pass, rotary drum heat dryer system to produce Class A biosolids pellets for beneficial reuse. As an integral part of its expansion project, EWA prepared a Biosolids Management Plan (BMP) through a multifaceted process that included formulation of evaluation factors for the decision framework, surveys of potential endusers, evaluation of various reuse/disposal (R/D) options using economic and qualitative analyses, generation of a Financial Model, preparation of a Business Plan, and other related elements. This paper presents an overview of the BMP, focusing on the major planning elements, development process, and several unique features that make the approach used in the BMP a valuable tool for development of EWA's biosolids distribution and marketing program.
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