الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
in an era of growing concern over environmental sustainability .In this thesis investigates the greenhouses gas emissions estimation methods employed by (IPCC, USEPA, and GPSX program).furthermore, it explore the application of life cycle assessment(LCA) through OPENLCA program ,estimation energy consumption , cost estimation using CAPDETWORK program in the context of Russtmiya wastewater treatment plant (WWTP) . The three suggested alternatives for the model were CAS with a sand filter, CAS-N, and MBR. The analysis of the analyzed wastewater management system’s carbon footprint, energy consumption, estimation cost and environmental assessment ,Life cycle assessment (LCA) is a powerful tool to evaluate the environmental impacts of operatingthe domestic wastewater treatment plants (WWTPs). It involves a thorough evaluation of main characteristics or components of the environment, human health, and resources. However, the todate literature is still lacking analysis on the widely varied designs and operational conditions of full-scale WWTPs. Meanwhile, it was aimed here to integrate analyses such as LCA, Greenhouse Gases (GHGs) emissions, and energy consumption, when considering the environmental impacts of a full-scale WWTP, which can provide practical outputs to help the decision-making on optimum designs and operational conditions.The Russtmiya domestic WWTP, located in Iraq, was considered as the case study. Three operational alternatives were proposed as solutions to improve the WWTP’s performance, as follows: (1) conventional activated sludge with sand filter (CAS), (2)conventional activated sludge with sand filter and nitrogen removal (CAS-N), and (3) membrane bioreactor (MBR). The operation of such alternatives was investigated through modeling and simulation using GPS-X 8.0.1 software. The energy consumption of each alternative was estimated via GPS-X, while the GHGs emissions were estimated using three different methods according to the intergovernmental panel on climate change (IPCC), the United States environmental protection agency (USEPA), and GPS-X software. The OpenLCA software was used to measure all impact categories at both the midpoint and endpoint levels using various methods. As a conclusion,comparing the three proposed alternatives indicates that: (1) the MBR alternative provided the lowest energy consumption and moderate GHG emissions, and (2) the CAS alternative provided the best environmental performance particularly in aspects such as the ozone depletion, global warming,and climate change, where the lowest GHGs emissions values had the major contribution