Abstract Inter-laboratory reproducibility of biomethane potential (BMP) is dismal, with differences in BMP values for the same sample exceeding a factor two some cases. A large group researchers directly addressed this problem during workshop held Leysin, Switzerland, June 2015. The resulted new set guidelines tests published 2016, which subject present commentary. work has continued international inter-laboratory studies and one additional Freising, Germany, 2018. dataset generated by were...

OPINION article Front. Energy Res., 23 April 2020Sec. Bioenergy and Biofuels Volume 8 - 2020 | https://doi.org/10.3389/fenrg.2020.00063

Ammonia inhibition is an important reason for reactor failures and economic losses in anaerobic digestion. Its impact on acetic acid degradation well studied, while its effect propionic butyric has received little attention consequently not considered the Anaerobic Digestion Model No. 1 (ADM1). To compare ammonia of these three volatile fatty acids (VFAs), we fed a mixture them as sole carbon source to continuous stirred tank reactors increased ammonium bicarbonate concentrations influent...

Abstract Biogas plants have the potential to provide demand‐oriented electricity compensate occurring divergence between energy demand and supply by uncontrollable sources like wind solar power. The general flexibility of biological process is proofed in particular under full‐scale conditions for a biogas production according grid demand. A model predictive control was developed calculate feeding strategies order fulfill gas utilization timetable. Full‐scale experiments showed high intraday...

For future energy supply systems with high proportions from renewable sources, biogas plants are a promising option to demand-driven electricity compensate the divergence between demand and by uncontrolled sources like wind solar. Apart expanding gas storage capacity demand-oriented feeding aim of flexible production can be an effective alternative. The presented study demonstrated degree intraday flexibility (up 50% compared average) potential for shutdown up 3 days (decreasing more than...

Methane emissions from livestock manure are primary contributors to GHG agriculture and options for their mitigation must be found. This paper presents the results of a study on methane stored liquid dairy cow during summer winter storage periods. Manure season was under controlled conditions in barrels at ambient temperature simulate conditions. samples were measured two time periods: 0 69 139 days. For period, experiments covered four 70, 138, 209, 279 continuous days, with probing every...

Abstract Livestock farming and manure management contribute substantially to greenhouse gas (GHG) emissions in agriculture. Anaerobic digestion (AD) of is a promising strategy for mitigating these emissions. This study aimed assess the biomethane potential (BMP) various types pig slurry, investigate factors that influence production, analyze degradation kinetics, propose AD process optimization approaches. Thus, substrate analysis, BMP tests batch assays, kinetic modeling, principal...

Demand-driven biogas production could play an important role for future sustainable energy supply. However, feeding a reactor according to demand may lead organic overloading and, thus, process failures. To minimize this risk, digesters need be actively steered towards containing more robust microbial communities. This study focuses on acetogenesis and methanogenesis as crucial steps avoiding acidification. We fed lab-scale anaerobic with volatile fatty acids under various regimes...

The impact of storage temperature (4, 22 and 37 °C) time (7, 14 21 days) on anaerobic digestion inocula was investigated through specific methanogenic activity assays. Experimental results showed that decreased over with storage, regardless temperature. However, the rate at which two five times slower 4 °C than °C, respectively. inoculum stored room (22 maintained close to fresh for days (<10% difference). a is preferred because decrease in lengthier time. From this research, it concluded...

The increasing demand for renewable energy sources and demand-oriented electricity provision makes anaerobic digestion (AD) one of the most promising technologies. In addition to crops, use lignocellulosic residual waste materials from agriculture is becoming increasingly important. However, AD such feedstocks often associated with difficulties due high content lignocellulose its microbial persistence. present work, effect hydrothermal pretreatment (HTP) on digestibility wheat straw...

Waterweeds (Elodea nuttallii and Elodea canadensis) are invasive neophytes, which have been proliferating at a phenomenal rate during the last decades in German waterways. In case of overgrowth, strong covering vegetation can cause problems hydroelectric power plants leads to limitations ship boat traffic as well use for bathing fishing activities. After period, dead accumulate then negatively influence flood protection water engineering works. For this reason, aquatic biomass has...

The process of anaerobic digestion in which waste biomass is transformed to methane by complex microbial communities has been modeled for more than 16 years parametric gray box approaches that simplify biology and do not resolve intracellular activity. Information on such activity, however, become available unprecedented detail recent experimental advances metatranscriptomics metaproteomics. inclusion data could lead powerful models faithfully represent the activity communities. We augmented...

For biogas-producing continuous stirred tank reactors, an increase in dilution rate increases the methane production as long substrate input can be converted fully. However, higher rates necessitate specific microbial growth rates, which are assumed to have a strong impact on apparent biomass yield due cellular maintenance. To test this, we operated two reactors at 37°C parallel of 0.18 and 0.07 days-1 (hydraulic retention times 5.5 14 days, doubling 3.9 9.9 days steady state) with identical...

Biochemical methane potential (BMP) tests are commonly applied to evaluate the recoverable amount of from a substrate. Standardized protocols require inclusion positive control with known BMP check experimental setup and execution, as well performance inoculum. Only if is within expected range entire test validated. Besides ignorance this requirement, limited availability standard microcrystalline cellulose might be main reason for neglecting control. To address limitation, eight widely...