February 2018 CASE STUDY Regenis Construction Management and Operations Services Edaleen Dairy, Lynden, WA OVERVIEW Edaleen Dairy is an 1,800 wet-cow dairy in Northwest Washington State which uses alley scrapers to scrape free-stall manure to a pit for mixing with wash water. This manure wastewater is then pumped to a DVO mesophilic mixed plug-flow, Linear Vortex, anaerobic digester that practices limited co-digestion with off- farm organics (<5% volume). Effluent from the digester is then sent to a GEA/Houle two-stage, slope-screen separator and DVO Phosphorus Recovery modified DAF separator for recovery of coarse and fine solids and production of a thin tea-liquid waste for lagoon storage and eventual field application. Biogas is utilized in a Dresser-Rand Guascor SFGLD 560 engine/

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