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Post-treatment of biogas digestate – An evaluation of ammonium recovery, energy use and sanitation
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (FE)ORCID iD: 0000-0002-3485-5440
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (FE)ORCID iD: 0000-0002-5014-3275
2017 (English)Conference paper, Oral presentation only (Refereed)
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.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Digestate; Fertilizer; Anaerobic digestion; Ammonia stripping; Sanitation; post-treatment
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:mdh:diva-37585OAI: oai:DiVA.org:mdh-37585DiVA: diva2:1169454
Conference
9th International Conference on Applied Energy, ICAE2017, 21-24 August 2017, Cardiff, UK
Funder
Knowledge Foundation
Available from: 2017-12-27 Created: 2017-12-27 Last updated: 2017-12-28Bibliographically approved

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Thorin, EvaSchwede, Sebastian

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CiteExportLink to record
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  • ieee
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