TY - CHAP A1 - Knoop, Christine A1 - Dietrich, Nils A1 - Heinrich, Martina A1 - Dornack, Christina A1 - Raab, Thomas T1 - Degradation of soil amendments produced from municipal organic waste digestate during a two-year field study T2 - 25th European Biomass Conference and Exhibition, Stockholm, 2017 N2 - The structural degradation of agricultural soils is an increasing problem of our times caused by intense land use. The treatment of soils with organic amendments shall maintain and improve long-term soil fertility. Solid residues from anaerobic digestion of municipal organic waste (MOW) are rich in nutrients and organic matter and have a promising potential to be used as soil amendment. Our research investigates the characteristics of differently treated amendments produced from MOW digestate. We want to know how long these amendments are present in the soil and which amendment type contributes most to nutrient provision after application. Results were obtained using four different MOW digestate amendments of one origin (loose, pelletized and agglomerated) during a 24-hours shaker-experiment and a bag-experiment on grassland, which was subsequently sampled over 21 months. Results show that short-term element leaching is higher from loose amendment and small agglomerates, probably caused by higher surface area und lower stability of these amendments. Biggest degradation effects can be seen 7 months after application to soil. However, all four amendments are still present after 21 months. Pelletized amendments are more degradation resistant than loose amendment, which may be advantageous regarding long-term effects e.g. on water holding capacity. In turn, loose material delivers a higher share of small organic particles to soil and may therefore have a higher contribution to humus development. Y1 - 2017 SN - 978-88-89407-17-2 U6 - https://doi.org/10.5071/25thEUBCE2017-4AV.2.14 SP - 1720 EP - 1723 ER - TY - GEN A1 - Knoop, Christine A1 - Dornack, Christina A1 - Raab, Thomas T1 - Effect of drying, composting and subsequent impurity removal by sieving on the properties of digestates from municipal organic waste T2 - Waste Management N2 - The application of organic soil amendments is a common measure to prevent structural degradation of agricultural soils and to maintain and improve long-term soil fertility. Solid residues from anaerobic digestion of municipal organic waste (MOW) are rich in nutrients and organic matter and have a promising potential to be used as soil amendment. However, no study has related amendment properties of MOW digestate of one origin to different treatment procedures. We therefore investigated the impact of drying, composting and sieving on final digestate properties and specifically nutrient availability and heavy metal and carbon elution. Samples were provided by a semi-industrial two-stage biogas plant with dry fermentation of MOW. Results confirm that in comparison to drying, composting of MOW digestates leads to a significant increase of K, P, Mg, Ca, Cd and Cr in the digestates. Sieving of composted digestates showed that heavy metals are not evenly distributed and that heavy metal concentration in the digestate increases with decreasing mesh sizes (highest concentrations in the fractions <1 mm). Although the element concentration is higher in composted batches, the water-extractability of nutrients, heavy metals and carbon is significantly lower from composted over dried digestates. A significant correlation was found between the dissolution of Zn, Ni, Ca and Mg and pH of eluate as well as dissolved organic carbon (DOC) release (R > 0.7, p < 0.05). Results confirm that the extent of carbon elution depends on the degradation rate of digestates. DOC may therefore be a good measure to evaluate digestate stability and to decide on treatment measures. KW - Municipal organic waste KW - Anaerobic digestion KW - Digestate treatment KW - Nutrient and heavy metal elution KW - Dissolved organic carbon KW - Digestate properties Y1 - 2018 U6 - https://doi.org/10.1016/j.wasman.2017.11.022 SN - 1879-2456 VL - 72 SP - 168 EP - 177 ER - TY - GEN A1 - Knoop, Christine A1 - Tietze, Michael A1 - Dornack, Christina A1 - Raab, Thomas T1 - Fate of nutrients and heavy metals during two-stage digestion and aerobic post-treatment of municipal organic waste T2 - Bioresource Technology N2 - The biogas technology is a promising approach for the recovery of energy and fertilizer from municipal organic waste (MOW). However, only scarce information on the development of initial nutrient and heavy metal loads during processing is available. Therefore, this study investigates properties of source-separated MOW during treatment in a semi-industrial scale two-stage biogas plant and subsequent digestate composting including impurities removal. Data from 15 batch experiments was investigated by material and substance flow analysis. Results of this study have shown that about 40% of nutrients contained in the MOW inflow are mineralized during anaerobic and subsequent aerobic treatment. A higher nutrient release was observed during the anaerobic treatment step. Additionally, impurities removal causes a significant reduction of final nutrient content. Heavy metal analysis confirmed a high heterogeneity of contamination levels. However, digestion and composting do not seem to significantly impact on total heavy metal loads in the substrate flow. KW - MOW KW - Digestate treatment KW - Composting KW - Substance flow analysis KW - Nutrient transfer KW - Heavy metals Y1 - 2018 U6 - https://doi.org/10.1016/j.biortech.2017.12.019 SN - 1873-2976 VL - 251 SP - 238 EP - 248 ER - TY - GEN A1 - Otto, Pascal A1 - Abendroth, Christian A1 - Dornack, Christina T1 - Designer-Mikrobiome für den Biogassektor T2 - Müll und Abfall N2 - Das Institut für Abfall- und Kreislaufwirtschaft (IAK) der TU Dresden ist am von der Europäischen Union im Rahmen des H2020-Programms geförderten Projekts "Micro4Biogas" beteiligt. Ziel des Projektes ist es, zur Unterstützung und Modernisierung des Biogassektors in den EU-Ländern beizutragen. Im Mittelpunkt stehen die Untersuchung der anaeroben Vergärung und des Mikrobioms, welche trotz jahrzehntelanger Forschung nicht ausreichend entschlüsselt sind. Obwohl das Wissen über die beteiligten Mikroorganismen zunimmt, wird das Mikrobiom nach wie vor als "Black Box" betrachtet. Im Rahmen von Micro4Biogas erfolgt die Charakterisierung natürlicher mikrobieller Gemeinschaften sowie die Erforschung neuer synthetischer mikrobieller Gemeinschaften. Darauf aufbauend erfolgt die Entwicklung von Strategien zur gezielten Beeinflussung des Mikrobioms (Bioaugmentation), die dazu dienen, den Prozess robuster, schneller, produktiver und standardisierter zu gestalten. Das bestehende und generierte Fachwissen wird in einer frei verfügbaren Roadmap zusammengefasst. Die Roadmap soll zudem Leitlinien und Handlungsempfehlungen für Industrie und Politik zur nachhaltigen und optimierten Produktion von Biogas enthalten. N2 - The institute of Waste Management and Circular Economy (IAK) is involved in the project "Micro4Biogas". This project is funded by the European Union under the H2020 programme and aims to contribute to the strengthening and modernisation of the biogas sector in the European Union. The focus is on the study of anaerobic digestion and the microbiome, which have not been sufficiently understood despite decades of research. Although knowledge about the involved microorganisms is increasing, the microbiome is still considered a "black box". Within the framework of Micro4Biogas, the characterization of natural microbial communities as well as the exploration of new synthetic microbial communities takes place. Based on this, strategies will be developed to specifically influence the microbiome (bioaugmentation), which will enable the process to become more robust, faster, more productive and more standardised. The existing and generated expertise will be summarised in a freely accessible roadmap. This also includes recommendations on how industry and politics can act to produce biogas in a sustainable and optimised way. KW - Biogas Y1 - 2022 UR - https://muellundabfall.de/ce/designer-mikrobiome-fuer-den-biogassektor/detail.html U6 - https://doi.org/10.37307/j.1863-9763.2022.05.05 SN - 1863-9763 VL - 54 IS - 05 SP - 243 EP - 247 ER - TY - GEN A1 - Abendroth, Christian A1 - Dornack, Christina A1 - Nefigmann, Sven A1 - Otto, Pascal ED - Nelles, Michael T1 - Mikroskopische Helden der Biogasbranche T2 - Tagungsband zum 20. Dialog Abfallwirtschaft und zum 16. Rostocker Bioenergieforum N2 - Das Streben nach umweltfreundlicher Energie und Wertstoffen hat in den letzten Jahren, gestärkt durch Wirtschaft und Politik, den Drang nach Innovation erheblich angeregt. Dieser Entwicklungsdrang findet sich in vielen Bereichen wieder, unter anderem in der Bioökonomie und hier auch bei Biogasanlagen. Das Schlagwort „Mikrobiom“ ist im medizinischen Bereich bereits weit verbreitet und wird im populärwissenschaftlichen Bereich in zahlreichen Büchern diskutiert. Dies unterstreicht das große gesellschaftliche Interesse an diesem Thema. Neben diesen Erkenntnissen gewinnt das Mikrobiom im Bereich der Bioenergien zunehmend an Bedeutung. In den letzten Jahren sind in hochrangigen, internationalen Fachjournalen zahlreichen Artikel erschienen, welche aufzeigen, dass Biogasanlagen wahre Superhelden unter den Mikroorganismen beherbergen. Die hohe Diversität wurde bereits in zahlreichen Publikationen diskutiert. Trotz dessen wird das Mikrobiom als „Blackbox“ betrachtet. Wissenschaftler weltweit versuchen diese Blackbox aufzulösen und hierbei traten einige Überraschungen auf. Dieses neue Wissen könnte den Grundstein für neue Konzepte der Prozesssteuerung legen. Ziel der vorliegenden Arbeit ist in diesem Zusammenhang eine Kurzübersicht über mikrobielle Innovation im Zusammenhang mit anaeroben Mikrobiomen. KW - Biogas, Mikrobiome Y1 - 2022 UR - https://bioenergieforum.auf.uni-rostock.de SN - 978-3-86009-535-5 U6 - https://doi.org/10.18453/rosdok_id00003615 SP - 233 EP - 241 CY - Rostock ER - TY - GEN A1 - Oviedo-Ocaña, Edgar Ricardo A1 - Abendroth, Christian A1 - Dominguez Rivera, Isabel Cristina A1 - Sánchez Ferrer, Antoni A1 - Dornack, Christina T1 - Life cycle assessment of biowaste and green waste composting systems: A review of applications and implementation challenges T2 - Waste Management N2 - Composting is one of the most widely applied methods for recycling organic waste. This process has been proposed as one option that facilitates the reincorporation of materials into the production cycle. However, composting also generates environmental impacts. Life Cycle Assessment (LCA) is the most common approach to evaluate the environmental impacts of a process at different system stages. Nevertheless, applying LCA in composting facilities is challenging due to the extensive information required, the lack of standardization on the initial assumptions, the definition of system boundaries, and the high diversity of existing composting technologies. This paper systematically reviews LCA studies in biowaste and/or green waste composting. The study highlights the challenges that should be met in order to improving the application of LCA to evaluate the environmental impacts of this type or waste treatment strategy. The review protocol used identified 456 papers published between 2010 and 2022. After the screening, 56 papers were selected, read, and thoroughly analyzed. The results show that: i) about 68% of the studies aimed to compare composting with other solid waste management options; ii) there was a wide diversity among the impact categories considered, which predominantly included climate change and ozone depletion; iii) there was no consensus on the functional unit or the system boundaries; iv) the main gaseous emissions studied were ammonia, methane, and nitrogen oxide, which were generally determined by emission factors; v) the avoided environmental impacts associated with the end-product quality and its application as an organic amendment or soil improver were ignored. This work demonstrates the complexity of conducting credible and valid composting LCA studies and proposes seven recommendations for improving the application of this assessment methodology to analyze this waste management alternative. KW - Biowaste KW - Life Cycle Assessment KW - Composting KW - Environmental impact KW - Green waste Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S0956053X23005688 U6 - https://doi.org/10.1016/j.wasman.2023.09.004 SN - 1879-2456 SN - 0956-053X VL - 171 SP - 350 EP - 364 ER -