Abstract: 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.

Abstract: An anaerobic organic substrate treatment system is provided which comprises digester tubes wherein an inner bag of the digester tube is used to collect the solids content of the waste and an outer bag of the digester tube is used to collect the liquid and gas leachate from waste slurry input into the digester tubes. The inner bag is permeable to both gas and liquid while the outer bag is impermeable to both gas and liquid and allows for collection of gas and liquid leachate in the outer bag. Collected gas and liquid leachate may then be drained and collected using a drainage and collection system. Following treatment, the outer bag may opened to retrieve the inner bag for retrieval of the treated solids substrate. The substrate may then be used as needed. In one variant, the outer bag is re-sealable and may be reused in further treatment operations. The anaerobic waste treatment system may be used to carry out such treatment operations as storage/hydrolysis, methanization, and/or digestate treatment.

Abstract: An anaerobic organic substrate treatment system is provided which comprises digester tubes wherein an inner bag of the digester tube is used to collect the solids content of the waste and an outer bag of the digester tube is used to collect the liquid and gas leachate from waste slurry input into the digester tubes. The inner bag is permeable to both gas and liquid while the outer bag is impermeable to both gas and liquid and allows for collection of gas and liquid leachate in the outer bag. Collected gas and liquid leachate may then be drained and collected using a drainage and collection system. Following treatment, the outer bag may opened to retrieve the inner bag for retrieval of the treated solids substrate. The substrate may then be used as needed. In one variant, the outer bag is re-sealable and may be reused in further treatment operations. The anaerobic waste treatment system may be used to carry out such treatment operations as storage/hydrolysis, methanization, and/or digestate treatment.