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Post-treatment of biogas digestate – An evaluation of ammonium recovery, energy use and sanitation
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. (FE)ORCID-id: 0000-0002-3485-5440
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi. (FE)ORCID-id: 0000-0002-5014-3275
2017 (engelsk)Inngår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 142, s. 957-963Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The utilization of digestate from anaerobic digestion (AD) processes offers the possibility to recycle nutrient from organic wastematerials back to the food chain. However, digestates are characterized by a high water content resulting in high storagecapacities and transportation costs. Various organic wastes such as organic municipal solid waste (oMSW) require sanitation withat least one hour hydraulic retention time (HRT) at 70°C to inactivate pathogens for the safe release of the material.Consequently, the sanitation process is one of the largest energy consumers in the whole AD process chain. In this study, a posttreatmentof the biogas digestate was evaluated regarding the potential for energy savings and nutrient recovery via nitrogenstripping in comparison to the conventional pre-sanitation of the organic waste. With increasing HRT (one to three hours) andaeration flow (0.0-5.3 L air per L digestate and minute) more condensate and ammonia was removed from the digestate. The totalammonia removal from the digestate after one and three hours with the highest aeration flow rate reached 42% and 80%,respectively. However, energy requirement for aeration exceeded energy savings from the lower volume for sanitation after thedigestion substantially. On a system level, a positive energy balance could still be achieved by taking energy savings from thereplacement of mineral fertilizer (36 GJ per ton NH4) into account. Moreover, the digestate as fertilizer could be applied in amore demand-oriented way by adding ammonium sulphate obtained by the ammonia stripping during the post-treatment.

sted, utgiver, år, opplag, sider
2017. Vol. 142, s. 957-963
Emneord [en]
Digestate; Fertilizer; Anaerobic digestion; Ammonia stripping; Sanitation; post-treatment
HSV kategori
Identifikatorer
URN: urn:nbn:se:mdh:diva-37585DOI: 10.1016/j.egypro.2017.12.153ISI: 000452901601019Scopus ID: 2-s2.0-85041551750OAI: oai:DiVA.org:mdh-37585DiVA, id: diva2:1169454
Konferanse
9th International Conference on Applied Energy, ICAE2017, 21-24 August 2017, Cardiff, UK
Forskningsfinansiär
Knowledge FoundationTilgjengelig fra: 2017-12-27 Laget: 2017-12-27 Sist oppdatert: 2019-01-03bibliografisk kontrollert

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