TY - JOUR A1 - Amponsem, Bright A1 - Bensah, Edem Cudjoe A1 - Ahiekpor, Julius Cudjoe A1 - Cremer, Tobias A1 - Herold, Nadine A1 - Antwi, Edward A1 - Mensah, Isaac A1 - Narra, Satyanarayana A1 - Boahen, Benjamin T1 - Cleaner energy potential analysis for composite biomass residues from decentralized sawmills in Ghana- A case study for Oforikrom Municipality JF - Cleaner Engineering and Technology N2 - The variation of wood species processed in sawmills in developing countries generates composite waste which presents treatment challenges due to a lack of understanding of their physicochemical characteristics for proper planning for clean energy generation. Most of the waste is discarded or burnt openly which releases harmful gases into the environment. This study investigated the physicochemical characteristics of mixed sawdust generated from five wood species generated at a Ghanaian sawmill in Oforikrom Municipality for improving waste treatment. The particle size distribution (PSD), bulk density, proximate and ultimate values, thermogravimetric analysis (TGA) and structural analysis were used to characterize the composite sawdust for briquetting and gasification purposes. It was found that the net heating value (17.46 MJ/kg), some proximate and ultimate values meet briquette standard but high percentages of ash (2.95%), moisture (41.48%) and the possibility of nitrogen oxides emissions were notable challenges. PSD resulted in different high fine fractions which are unsuitable for densification. The increase of sieving amplitudes at 30, 50 and 80 rpm generated an average increase in sieve efficiency of fines by 4.22%. Mixing of fines (42.38–46.6%) and optimum particle size (53.40–57.62%) fractions was suggested as the best approach to enhance briquette density and durability. The FTIR spectra showed a range of peaks such as 1734.46 cm−1, 1620.48 cm−1, 1506.50 cm−1, 1462.02 cm−1, 1420.32 cm−1 etc. for functional groups identification. Composite sawdust spectra showed high absorbance with no shift of wavenumbers compared with temperate woods, however, it deviated massively when compared with industrial cellulose and organosolv lignin. TGA indicated that exact mixed wood pyrolysis temperatures, volatile and biochar fractions will always depend on sample compositions. The increase in heating rates yielded little significance to volatiles and char increments. Collection of clean sawdust and rooftop drying were recommended as a way of enhancing sawdust properties. Composite sawdust has a promising potential to support Ghana's activities for meeting the renewable energy generation targets. The understanding of these potential assessments is significant to boost the local municipality energy supply. KW - Composite sawdust; Heating value; Structural compositions; Particle size distribution; Thermogravimetric analysis; Bioenergy Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:eb1-opus-6154 SN - 2666-7908 IS - 11 PB - Elsevier ER - TY - CHAP A1 - Franke, Tom A1 - Lenz, Claudia A1 - Hertrich, Sven A1 - Kehr, Martin A1 - Kuhnert, Niklas A1 - Munier, Leo Felix A1 - Schultz, Marcus A1 - Stepputat, Sören A1 - Herold, Nadine A1 - Pfriem, Alexander T1 - Künstliche Bewitterung von Buchenfurnier (Fagus sylvatica) imprägniert mit drei Phenolharzen unterschiedlichen Molekulargewichts Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:eb1-opus-7609 N1 - 17. Holztechnologisches Kolloquium 28.-29. April 2016, Dresden, Germany ER - TY - JOUR A1 - Mensah, Isaac A1 - Ahiekpor, Julius Cudjoe A1 - Herold, Nadine A1 - Bensah, Edem Cudjoe A1 - Pfriem, Alexander A1 - Antwi, Edward A1 - Amponsem, Bright T1 - Biomass and plastic co-pyrolysis for syngas production: Characterisation of Celtis mildbraedii sawdust as a potential feedstock JF - Scientific African N2 - Celtis mildbraedii sawdust (CMS) from Ghana was characterised to investigate its suitability with polyethylene terephthalate (PET) for syngas production via co-pyrolysis. The physical and chemical properties assessed include proximate and ultimate compositions, pH value, higher heating value (HHV), and lignocellulosic composition. Also, the thermal behaviour at different heating rates (5, 10, and 20 K/min) and qualitative prediction of organic compounds of CMS were examined using thermogravimetric analysis (TG/DTG) and NIR spectroscopy techniques, respectively. Results of proximate analysis (moisture = 17.15 ± 0.0 wt.%, ash = 1.13 ± 0.4 wt.%, volatile matter = 68.39 ± 0.4 wt.%, fixed carbon = 13.33 ± 0.8 wt.%); ultimate analysis (C = 48.51 wt.%, H = 6.66 wt.%, N = 0.51 wt.%, S = 0.02 wt.%, O = 44.30 wt.%); pH values (cold phase = 7.60, hot phase = 6.30); HHV (15.37 – 18.03 MJ/kg); and lignocellulosic composition (extractives = 13.80 ± 0.57 wt.%, hemicellulose = 21.95 ± 3.89 wt.%, lignin = 17.35 ± 0.35 wt.%, cellulose = 46.90 ± 2.97 wt.%) were obtained. The maximum mass loss was 83.48% at 289.8 °C at 5 K/min. It was concluded that CMS is a highly potential biomass resource for syngas production with an empirical formula of CH1.64O0.69N0.009S0.0001. KW - Celtis mildbraedii sawdust; Physicochemical; Characterisation; Co-pyrolysis; Syngas; production; Ghana Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:eb1-opus-4588 SN - 2468-2276 IS - 16 PB - Elsevier ER - TY - JOUR A1 - Munier, Leo Felix A1 - Franke, Tom A1 - Herold, Nadine A1 - Pfriem, Alexander T1 - Humidity's Effect on the Dynamic-mechanical Behavior of Phenol-formaldehyde Impregnated Beech Wood Veneer JF - BioResources N2 - The dynamic-mechanical behavior of phenol-formaldehyde-impregnated beech wood (Fagus sylvatica L.) veneers was evaluated at various relative humidities. The aim was to identify the plasticizing effects of moisture on phenol-formaldehyde-impregnated veneers. Thin beech veneer samples were impregnated with a low and a medium molecular weight phenol- formaldehyde resin. The measurements were performed with a dynamic- mechanical thermal analysis equipped with a humidity generator. The storage modulus and the loss factor of the uncured phenol-formaldehyde- impregnated and the untreated control veneers were determined at a relative humidity of 15%, 60%, and 85% and a constant temperature of 25 °C. The untreated control veneers exhibited the smallest reduction of the normalized storage modulus. In contrast, the phenol-formaldehyde- impregnated samples exhibited a more intense relative reduction of the storage modulus with increasing relative humidity. This effect was more distinct for samples impregnated with low molecular weight phenol- formaldehyde than for those impregnated with medium molecular weight phenol-formaldehyde. In addition, higher solids contents in the resins led to even smaller normalized storage modulus. Consistently, the loss factor indicated a greater softening of the samples with an increasing humidity and higher solids content of the phenol-formaldehyde. KW - DMTA, Humidity sweep, Phenol-formaldehyde, Plasticization, Veneer modification Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:eb1-opus-3841 N1 - Offizielle URL: https://bioresources.cnr.ncsu.edu/resources/humiditys-effect-on-the-dynamic-mechanical-behavior-of-phenol-formaldehyde-impregnated-beech-wood-veneer/ IS - 15(1) SP - 1563 EP - 1574 ER -