Andreas Lemmer
YOU?
Author Swipe
View article: Predicting anaerobic digestion stability in load-flexible operation using gas phase indicators and classification algorithms
Predicting anaerobic digestion stability in load-flexible operation using gas phase indicators and classification algorithms Open
This study investigates early warning indicators for process instabilities in anaerobic digestion caused by shock-loadings in biogas plants, focussing on gas-phase parameters to avoid substrate analyses. With the increasing use of renewabl…
View article: How Fluid Pseudoplasticity and Elasticity Affect Propeller Flows in Biogas Fermenters
How Fluid Pseudoplasticity and Elasticity Affect Propeller Flows in Biogas Fermenters Open
Mixing in biogas fermenters is complex due to the non‐Newtonian rheology of biogenic substrates, which exhibit both pseudoplasticity and elasticity. It is yet unclear how these non‐Newtonian properties affect propeller flows and the mixing…
View article: Effects of Environmental and Nutritional Conditions on Mycelium Growth of Three Basidiomycota
Effects of Environmental and Nutritional Conditions on Mycelium Growth of Three Basidiomycota Open
In recent decades, an enormous potential of fungal-based products with characteristics equal to, or even outperforming, classic petroleum-derived products has been acknowledged. The production of these new materials uses mycelium, a root-l…
View article: Anaerobic Digestion of Cuttings from Grassland in Protected Landscape Areas
Anaerobic Digestion of Cuttings from Grassland in Protected Landscape Areas Open
Orchard meadows are biodiversity hotspots, as the understory often consists of species-rich lowland hay meadows. Due to the low energy density of the grass, it is not suitable as feed, but the energetic utilisation of cuttings from orchard…
View article: Comparison of Different Mechanical Pretreatment Methods for the Anaerobic Digestion of Landscape Management Grass
Comparison of Different Mechanical Pretreatment Methods for the Anaerobic Digestion of Landscape Management Grass Open
The aim of this study was to use landscape grass from species-rich orchards for biogas production, thus preserving these very valuable areas for future generations. Since these grass clippings have high lignocellulose content, the substrat…
View article: Mono-Digestion of 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Anaerobic Filters: A Cascade Utilization Approach
Mono-Digestion of 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Anaerobic Filters: A Cascade Utilization Approach Open
A proper remedy for the overexploitation of biomass and biobased materials in the bioeconomy is the valorization of biorefineries’ side streams into meaningful products. Hence, in pursuit of a cascade utilization of renewables, a unique bi…
View article: Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane
Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane Open
The increased demand for resources and energy that is developing with rising global consumption represents a key challenge for our generation. Biogas production can contribute to sustainable energy production and closing nutrient cycles us…
View article: Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane
Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane Open
The increased demand for resources and energy that is developing with rising global consumption represents a key challenge for our generation. Biogas production can contribute to sustainable energy production and closing nutrient cycles us…
View article: Effects of Pretreatment with a Ball Mill on Methane Yield of Horse Manure
Effects of Pretreatment with a Ball Mill on Methane Yield of Horse Manure Open
Lignocellulosic biomass is an abundant organic material, which can be utilised in biogas plants for sustainable production of biogas. Since these substrates usually have high lignin contents and consist of rather elongated particles, a spe…
View article: Investigation of Biogass Digestate as Fiber Materials for Composites;
Investigation of Biogass Digestate as Fiber Materials for Composites; Open
Fiber reinforced plastics with synthetic fibers are widely used. Plant fibers are also known to produce more sustainable composites. However, there is a great interest in finding alternatives to classical natural fibers. The digestate of b…
View article: Biochemical Methane Potential of a Biorefinery’s Process-Wastewater and its Components at Different Concentrations and Temperatures
Biochemical Methane Potential of a Biorefinery’s Process-Wastewater and its Components at Different Concentrations and Temperatures Open
A sustainable circular bioeconomy requires the side streams and byproducts of biorefineries to be assimilated into bioprocesses to produce value-added products. The present study endeavored to utilize such a byproduct generated during the …
View article: Nutrient Recovery from Digestate of Agricultural Biogas Plants: A Comparative Study of Innovative Biocoal-Based Additives in Laboratory and Full-Scale Experiments
Nutrient Recovery from Digestate of Agricultural Biogas Plants: A Comparative Study of Innovative Biocoal-Based Additives in Laboratory and Full-Scale Experiments Open
Nutrients can be recovered from the digestate of an agricultural biogas plant in the form of solid fraction and serve as crop fertilizers. Removal of suspended solids with screw press separators is the most commonly used technique for trea…
View article: Model Predictive Control: Demand-Orientated, Load-Flexible, Full-Scale Biogas Production
Model Predictive Control: Demand-Orientated, Load-Flexible, Full-Scale Biogas Production Open
Biogas plants have the great advantage that they produce electricity according to demand and can thus compensate for fluctuating production from weather-dependent sources such as wind power and photovoltaics. A prerequisite for flexible bi…
View article: CURRICULAR INNOVATION RESEARCH IN THE FIELD OF RENEWABLE ENERGY USING THE EXAMPLE OF ANAEROBIC DIGESTION AND METHANE PRODUCTION
CURRICULAR INNOVATION RESEARCH IN THE FIELD OF RENEWABLE ENERGY USING THE EXAMPLE OF ANAEROBIC DIGESTION AND METHANE PRODUCTION Open
In school and university education it is important to integrate current, innovative topics into curricula. Particularly in thefield of education for sustainable development, there is a major need, based on the Sustainable Development Goals,
View article: Impact of Long-Term Weathering on the Properties of a Digestate-Based Biocomposite
Impact of Long-Term Weathering on the Properties of a Digestate-Based Biocomposite Open
Natural fibre composites are increasingly used. For many applications, the long-term stability of the mechanical properties is crucial. Therefore, the effects of weathering of a biocomposite made from fibrous digestate and bio-based thermo…
View article: Comparison of fibers from hop rich biogas digestate with natural fibers as raw material for composites
Comparison of fibers from hop rich biogas digestate with natural fibers as raw material for composites Open
Fibrous material extracted from biogas digestate is investigated as a possible raw material for composites. Digestate is a by-product of every biogas plant and consists mostly of water, undegraded plant biomass, and minerals. On the other …
View article: Anaerobic Degradation of Individual Components from 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Fixed Bed Reactors
Anaerobic Degradation of Individual Components from 5-Hydroxymethylfurfural Process-Wastewater in Continuously Operated Fixed Bed Reactors Open
Production of bio-based materials in biorefineries is coupled with the generation of organic-rich process-wastewater that requires further management. Anaerobic technologies can be employed as a tool for the rectification of such hazardous…
View article: Modeling and Simulation of Biogas Production in Full Scale with Time Series Analysis
Modeling and Simulation of Biogas Production in Full Scale with Time Series Analysis Open
Future biogas plants must be able to produce biogas according to demand, which requires proactive feeding management. Therefore, the simulation of biogas production depending on the substrate supply is assumed. Most simulation models are b…
View article: Power demand forecasting for demand-driven energy production with biogas plants
Power demand forecasting for demand-driven energy production with biogas plants Open
For the future energy system it becomes increasingly important that biogas plants produce electricity in a demand-oriented way to compensate electricity production from fluctuating sources like wind power and photovoltaics. Flexibilisation…
View article: Assessment of Areal Methane Yields from Energy Crops in Ukraine, Best Practices
Assessment of Areal Methane Yields from Energy Crops in Ukraine, Best Practices Open
Growing and utilizing bioenergy crops as feeding substrates in biogas plants may aid the development of the biogas sector in Ukraine. Therefore, research was done on potential methane yields from 22 high-yield varieties of 7 different crop…
View article: Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion
Effects of Increasing Nitrogen Content on Process Stability and Reactor Performance in Anaerobic Digestion Open
The aim of this study was to analyse the effect of different nitrogen increase rates in feedstock on the process stability and conversion efficiency in anaerobic digestion (AD). The research was conducted in continuously stirred tank react…
View article: Investigating flexible feeding effects on the biogas quality in full‐scale anaerobic digestion by high resolution, photoacoustic‐based NDIR sensing
Investigating flexible feeding effects on the biogas quality in full‐scale anaerobic digestion by high resolution, photoacoustic‐based NDIR sensing Open
In future energy systems based on renewable energies, biogas plants can make a significant contribution to stabilizing the electricity grids. However, this requires load‐flexible and demand‐oriented electricity production by means of flexi…
View article: Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation
Performance enhancement of biological methanation with trickle bed reactors by liquid flow modulation Open
Experiments were carried out to investigate the influence of liquid flow modulation of trickle bed reactors ( TBR ) on biological hydrogen methanation ( BHM ). The modulation promises to improve the gas‐liquid mass transfer and has already…