Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Bemerkung Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Zugriffsart Link Abteilungen OPUS4-10741 Wissenschaftlicher Artikel Hoffstadt, Kevin, k.hoffstadt@fh-aachen.de; Cheenakula, Dheeraja, cheenakula@fh-aachen.de; Nikolausz, Marcell, ; Krafft, Simone, krafft@fh-aachen.de; Harms, Hauke, ; Kuperjans, Isabel, kuperjans@fh-aachen.de Design and construction of a new reactor for flexible biomethanation of hydrogen The increasing share of renewable electricity in the grid drives the need for sufficient storage capacity. Especially for seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen produced from surplus electricity can be used to substitute natural gas in the existing infrastructure. Current reactor types are not or are poorly optimized for flexible methanation. Therefore, this work proposes a new reactor type with a plug flow reactor (PFR) design. Simulations in COMSOL Multiphysics ® showed promising properties for operation in laminar flow. An experiment was conducted to support the simulation results and to determine the gas fraction of the novel reactor, which was measured to be 29%. Based on these simulations and experimental results, the reactor was constructed as a 14 m long, 50 mm diameter tube with a meandering orientation. Data processing was established, and a step experiment was performed. In addition, a kLa of 1 h−1 was determined. The results revealed that the experimental outcomes of the type of flow and gas fractions are in line with the theoretical simulation. The new design shows promising properties for flexible methanation and will be tested. Basel MDPI 2023 15 Fermentation 9 The article belongs to the Special Issue Fermentation Processes: Modeling, Optimization and Control 8 1 16 10.3390/fermentation9080774 weltweit https://doi.org/10.3390/fermentation9080774 Fachbereich Chemie und Biotechnologie OPUS4-10185 Wissenschaftlicher Artikel Cheenakula, Dheeraja, cheenakula@fh-aachen.de; Hoffstadt, Kevin, k.hoffstadt@fh-aachen.de; Krafft, Simone, krafft@fh-aachen.de; Reinecke, Diana, ; Klose, Holger, ; Kuperjans, Isabel, kuperjans@fh-aachen.de; Grömping, Markus, groemping@fh-aachen.de Anaerobic digestion of algal-bacterial biomass of an Algal Turf Scrubber system This study investigated the anaerobic digestion of an algal-bacterial biofilm grown in artificial wastewater in an Algal Turf Scrubber (ATS). The ATS system was located in a greenhouse (50°54′19ʺN, 6°24′55ʺE, Germany) and was exposed to seasonal conditions during the experiment period. The methane (CH4) potential of untreated algal-bacterial biofilm (UAB) and thermally pretreated biofilm (PAB) using different microbial inocula was determined by anaerobic batch fermentation. Methane productivity of UAB differed significantly between microbial inocula of digested wastepaper, a mixture of manure and maize silage, anaerobic sewage sludge, and percolated green waste. UAB using sewage sludge as inoculum showed the highest methane productivity. The share of methane in biogas was dependent on inoculum. Using PAB, a strong positive impact on methane productivity was identified for the digested wastepaper (116.4%) and a mixture of manure and maize silage (107.4%) inocula. By contrast, the methane yield was significantly reduced for the digested anaerobic sewage sludge (50.6%) and percolated green waste (43.5%) inocula. To further evaluate the potential of algal-bacterial biofilm for biogas production in wastewater treatment and biogas plants in a circular bioeconomy, scale-up calculations were conducted. It was found that a 0.116 km2 ATS would be required in an average municipal wastewater treatment plant which can be viewed as problematic in terms of space consumption. However, a substantial amount of energy surplus (4.7-12.5 MWh a−1) can be gained through the addition of algal-bacterial biomass to the anaerobic digester of a municipal wastewater treatment plant. Wastewater treatment and subsequent energy production through algae show dominancy over conventional technologies. Berlin Springer 2022 Biomass Conversion and Biorefinery 13 Corresponding author: Dheeraja Cheenakula 15 Seiten 10.1007/s13399-022-03236-z weltweit https://doi.org/10.1007/s13399-022-03236-z Fachbereich Bauingenieurwesen OPUS4-9245 Konferenzveröffentlichung Paulsen, Svea, paulsen@fh-aachen.de; Hoffstadt, Kevin, k.hoffstadt@fh-aachen.de; Krafft, Simone, krafft@fh-aachen.de; Leite, A., ; Zang, J., ; Fonseca-Zang, W., ; Kuperjans, Isabel, kuperjans@fh-aachen.de Continuous biogas production from sugarcane as sole substrate Elsevier 2020 5 Energy Reports 6 6th International Conference on Energy and Environment Research, ICEER 2019, 22-25 July, University of Aveiro, Portugal Supplement 1 153 158 10.1016/j.egyr.2019.08.035 weltweit https://doi.org/10.1016/j.egyr.2019.08.035 Fachbereich Energietechnik OPUS4-9337 Wissenschaftlicher Artikel Hoffstadt, Kevin, k.hoffstadt@fh-aachen.de; Pohen, Gino D., ; Dicke, Max D., ; Paulsen, Svea, paulsen@fh-aachen.de; Krafft, Simone, krafft@fh-aachen.de; Zang, Joachim W., ; Fonseca-Zang, Warde A. da, ; Leite, Athaydes, ; Kuperjans, Isabel, kuperjans@fh-aachen.de Challenges and prospects of biogas from energy cane as supplement to bioethanol production Innovative breeds of sugar cane yield up to 2.5 times as much organic matter as conventional breeds, resulting in a great potential for biogas production. The use of biogas production as a complementary solution to conventional and second-generation ethanol production in Brazil may increase the energy produced per hectare in the sugarcane sector. Herein, it was demonstrated that through ensiling, energy cane can be conserved for six months; the stored cane can then be fed into a continuous biogas process. This approach is necessary to achieve year-round biogas production at an industrial scale. Batch tests revealed specific biogas potentials between 400 and 600 LN/kgVS for both the ensiled and non-ensiled energy cane, and the specific biogas potential of a continuous biogas process fed with ensiled energy cane was in the same range. Peak biogas losses through ensiling of up to 27% after six months were observed. Finally, compared with second-generation ethanol production using energy cane, the results indicated that biogas production from energy cane may lead to higher energy yields per hectare, with an average energy yield of up to 162 MWh/ha. Finally, the Farm²CBG concept is introduced, showing an approach for decentralized biogas production. Basel MDPI 2020 Agronomy 10 6 10.3390/agronomy10060821 weltweit https://doi.org/10.3390/agronomy10060821 Fachbereich Energietechnik OPUS4-11036 Wissenschaftlicher Artikel Hoffstadt, Kevin, ; Nikolausz, Marcell, ; Krafft, Simone, krafft@fh-aachen.de; Bonatelli, Maria, ; Kumar, Vivekanantha, ; Harms, Hauke, ; Kuperjans, Isabel, kuperjans@fh-aachen.de Optimization of the ex situ biomethanation of hydrogen and carbon dioxide in a novel meandering plug flow reactor: start-up phase and flexible operation Basel MDPI 2024 18 Seiten Bioengineering 11 2 10.3390/bioengineering11020165 weltweit https://doi.org/10.3390/bioengineering11020165 Fachbereich Chemie und Biotechnologie