Potential bioethanol and biogas production using lignocellulosic biomass from winter rye, oilseed rape and faba bean

To meet the increasing need for bioenergy several raw materials have to be considered for the production of e.g. bioethanol and biogas.In this study, three lignocellulosic raw materials were studied, i.e. (1) winter rye straw (Secale cereale L), (2) oilseed rape straw (Brassica napus L.) and (3) faba bean straw (Viciafaba L.). Their composition with regard to cellulose, hemicellulose, lignin, extractives and ash was evaluated, as well as their potential as raw materials for ethanol and biogas production. The materials were pretreated by wet oxidation using parameters previously found to be optimal for pretreatment of corn stover (195 1C, 15 min, 2 g l_1 Na2CO3 and 12 bar oxygen). It was shown that pretreatment was necessary for ethanol production from all raw materials and gave increased biogas yield from winter rye straw. Neither biogas productivity nor yield from oilseed rape straw or faba bean straw was significantly affected by pretreatment. Ethanol was produced by the yeast Saccharomyces cerevisiae during simultaneous enzymatic hydrolysis of the solid material after wet oxidation with yields of 66%, 70% and 52% of theoretical for winter rye, oilseed rape and faba bean straw, respectively. Methane was produced with yields of 0.36, 0.42 and 0.44 l g_1 volatile solids for winter rye, oilseed rape and faba bean straw, respectively, without pretreatment of the materials. However, biogas productivity was low and it took over 50 days to reach the final yield. It could be concluded that all three materials are possible raw materials for either biogas or ethanol production; however, improvement of biogas productivity or ethanol yield is necessary before an economical process can be achieved. 2007 Elsevier Ltd. All rights reserved

Changing Gellerup Park: Political Interventions and Aesthetic Engagement in an Exposed Social Housing Area in Denmark

Some low-income social housing neighborhoods are undergoing radical transformations in Denmark.  Classified as “ghettos” and “parallel societies,” and marked by area-specific legislation, we identify a triple exposure in these neighborhoods. The residents are exposed to inequality, stigmatization, and discriminatory inter-ventions. Parallel to this, cultural policies and programs have ap-proached these same neighborhoods based on the assumption that they can be “elevated” through art. Drawing upon a broader re-search in art project in four social housing areas (Eriksson, Nielsen, Sørensen and Yates, 2022), this article focuses on Gellerup Park in Aarhus and considers how two site-specific art platforms address the site and time-specific conditions of the area, offering alterna-tive relations and forms of engagement