University of Tehran Civil Engineering Infrastructures Journal 2322-2093 50 1 2017 06 01 Estimation and Evaluation of Greenhouse Gas Emissions during the Life-Cycle of Wastewater Pipelines: Case Study of Tehran, Iran 191 206 61827 10.7508/ceij.2017.01.012 EN Bardia Roghani PhD candidate, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran. Massoud Tabesh Professor, Centre of Excellence for Engineering and Management of Civil Infrastructure, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran. 0000-0002-8982-8941 Mohammad Sadegh Amrollahi M.Sc. Graduate Student, School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran Govindarajan Venkatesh Senior Lecturer, Department of Engineering and Chemical Sciences, Faculty of Health, Science and Technology, Karlstad University, Karlstad, Sweden. Journal Article 2016 09 17 Climate change occasioned by the accumulation of greenhouse gases (GHGs) is now widely accepted as an issue which mankind needs to address. The starting point is necessarily the determination of all the sources of emissions during the life-cycles of the studied components. Post-calculation, the results ought to be presented to decision-makers in a clear manner so as to provide the basis on which corrective actions could be considered. This paper calculates the GHGs emissions during the life-cycle of wastewater pipelines and introduces a different approach to communicate information about GHGs released, to decision-makers. Different diameters of concrete and high-density polyethylene (HDPE) wastewater pipes are compared in a case study. Results show that the total CO₂-equivalent (CO₂-eq) emissions attributed to concrete pipes are greater than HDPE pipes. Hence, the equivalent bio-productive area of forest required to sequester the CO₂ (the major GHG) and its corresponding costs will be greater for the former. https://ceij.ut.ac.ir/article_61827_ea8feb94b7494cf068ed56942a43eba5.pdf