TWO-STAGE ANAEROBIC DIGESTION PROCESSES AND SYSTEMS COMPRISING AMMONIA REMOVAL FOR CONVERTING ORGANIC MATERIAL INTO BIOGAS
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United States of America
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Oct 31, 2024
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Apr 25, 2024
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Apr 25, 2024
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Described are two-stage anaerobic digestion processes and systems that are coupled with post-hydrolysis ammonia removal for digestion of high-nitrogen feedstock into biogas such as biomethane. The processes and related systems comprise a first-stage anaerobic digestion unit to obtain hydrolyzed material; a NH3-stripping unit to obtain an ammonia-stripped slurry; and a second-stage anaerobic digestion unit for the methanogenesis of the ammonia-stripped slurry and production of a digestate and biogas. One process and system is adapted for operation in a continuous or semi-continuous mode. Another process and system comprise stripping with upgraded biogas.
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