Life Cycle Assessment was used to evaluate environmental impacts associated to a full-scale wastewater treatment plant (WWTP) in Barcelona Metropolitan Area, with a treatment capacity of 2 million population equivalent, focussing on energy aspects and resources consumption. The wastewater line includes conventional pre-treatment, primary settler, activated sludge with nitrogen removal, and tertiary treatment; and the sludge line consists of thickening, anaerobic digestion, cogeneration, dewatering and thermal drying. Real site data were preferably included in the inventory. Environmental impacts of the resulting impact categories were determined by the CLM 2 baseline method. According to the results, the combustion of natural gas in the cogeneration engine is responsible for the main impact on Climate Change and Depletion of Abiotic Resources, while the combustion of biogas in the cogeneration unit accounts for a minor part. The results suggest that the environmental performance of the WWTP would be enhanced by increasing biogas production through improved anaerobic digestion of sewage sludge.
technology, have significantly increased their communicative possibilities, drawing and painting remain the ones best capable of supporting the artists' requirements: It is chiefly with drawing and painting that artists are able to revive the moving and initiating experience of the discovering of a great city. Through analyzing the work of a few graphic artists we will understand how drawing and painting overcome the limitations of photography and film, while technical aid opens up a new range of options and enables higher results. In the study of the following cases we shall observe the artists aim is no other than to reduce the gap between art and life.
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