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Bio-methanization of organic fraction from municipal solid waste: temperature effects

100%
Fernández-Rodríguez J., Pérez M., Romero L. I.
Polish Journal of Chemical Technology
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2013
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vol. 15
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issue 2
99-106
EN
The main objective of this study was to analyse the development of dry anaerobic digestion process of OFMSW in batch reactors under two temperature ranges, thermophilic (55°C) and mesophilic (35°C). The experimental results lead to the conclusion that the thermophilic range has a greater rate of hydrolysis and is therefore more effective to degrade wastes, shortening the overall operating time. For example, the hydrolytic step in the thermophilic (T) process lasted an average of 8 days versus 14 days in the mesophilic (M) range. The methanogenic phase lasted for 18 and 29 days in the T and M processes, respectively. The mesophilic range showed higher removal of the organic effluent but with greater uptime requirements. Moreover, the thermophilic range showed greater productivities than the mesophilic range, and the productivities were approximately doubled in terms of the produced biogas from a given amount of consumed organic matter.
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Directional Ordering in Amorphous Fe_{43}Ni_{43}Zr_7Cu_1B_6 Ferromagnetic Alloys

76%
Varga M., Varga R., Vojtaník P., Hernando B., Prida V., Santos J., Pérez M.
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issue 5
804-806
EN
Development of the atomic directional ordering in the Fe_{43}Ni_{43}Zr_7Cu_1B_6 alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
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