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To complete the study on harnessing the biogas produced by a UWTP as an energy source, using cogeneration with motor-generators and phosphoric acid fuel cells, in this paper we present the results of the environmental study. This completes the study made of both systems, enabling us to conclude which of the two methods is best in terms of obtaining the largest amount of energy, at the lowest cost, and with minimum impact on the environment. For the environmental analysis we compared, amongst other parameters, the contaminating gas emissions produced by each cogeneration device, and assessed the financial cost of the environmental damage caused by these emissions. We also bore in mind the emission levels created by the emissions from each system, both immediately around the plant and in the surrounding areas affected by prevailing wind directions. Finally, we compared the noise levels of the two devices and determined the financial cost of applying corrective acoustic insulation where necessary. The overall study of both systems has made it clear that to evaluate them correctly, it is necessary to internalize all the costs that are currently externalized. This is the only way to find the true cost of each system.

Environmental Analysis of Various Systems for the Cogeneration of Biogas Produced by An Urban Wastewater Treatment Plant (UWTP). (III).