Person: ÇİFTÇİOĞLU, GÖKÇEN ALEV
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ÇİFTÇİOĞLU
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GÖKÇEN ALEV
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Publication Metadata only Environmental analysis of different packaging waste collection systems for Istanbul - Turkey case study(ELSEVIER, 2016) ÇİFTÇİOĞLU, GÖKÇEN ALEV; Yildiz-Geyhan, Eren; Yilcan-Ciftci, Gulsah; Altun-Ciftcioglu, Gokcen Alev; Kadirgan, Mehmet Arif NesetSource-separated collection of recyclable packaging wastes has been a huge issue for cities such as Istanbul considering their socially, economically, culturally and environmentally cosmopolite structure. In order to apply an environmentally effective separation and collection, system has to be analyzed with a holistic approach including whole recycled packaging material amounts, source consumptions and related emissions. In this context, the aim of this study is to determine the environmentally optimum source-separated packaging waste collection system applicable in Istanbul, Turkey for the first time in literature. Eight scenarios for separated collection system were defined and all of them were compared with each other and with the existing system. To measure the efficiency of the system, some efficiency indicators were chosen and effectiveness related variables were determined to predict the participation rate. Calculations of the efficiency indicators for alternative scenarios were based on the existing system. The environmental analysis was conducted by using Life Cycle Assessment methodology. The results of this study showed that existing system was still one of the environmentally most promising scenarios. Following advantageous scenarios were Scenarios 5 and 6 which were two and three fractionated curbside collection systems, respectively. It is also seen that more fractionated scenarios were less beneficial than two fractionated scenarios. And finally, it can be concluded that with an increment on participation rate and changing collection material type, collection efficiency of curbside system would increase and be environmentally more beneficial. (C) 2015 Elsevier B.V. All rights reserved.Publication Metadata only Analysis of electricity generation options for sustainable energy decision making: The case of Turkey(PERGAMON-ELSEVIER SCIENCE LTD, 2020) ÇİFTÇİOĞLU, GÖKÇEN ALEV; Yilan, Gulsah; Kadirgan, M. A. Neset; Ciftcioglu, Gokcen A.Sustainable energy decision making requires the comparison of energy generation technologies regarding a wide range of economic, technical, environmental, and socio-economic criteria. This study aims to rank the main seven electricity generation technologies for Turkey according to their performance scores. These energy generation technologies are natural gas, coal, hydropower with dam, run-of-river type hydropower, onshore wind, geothermal and solar PV. The sustainability scores are calculated via twelve indicators classified into abovementioned four criteria groups. Multi-criteria decision analysis methodology is employed with a weighted sum multi-attribute utility approach for five different sensitivity cases. The results reveal that the hydroelectric technology with dam is the best option for most of the sensitivity cases. We hope this study gives a scientific and objective standpoint to decision-maker authorities in Turkey for planning sustainable electricity generation policies. (C) 2019 Elsevier Ltd. All rights reserved.Publication Metadata only Environmental and social life cycle sustainability assessment of different packaging waste collection systems(ELSEVIER, 2019) ÇİFTÇİOĞLU, GÖKÇEN ALEV; Yildiz-Geyhan, Eren; Yilan, Gulsah; Altun-Ciftcioglu, Gokcen Alev; Kadirgan, Mehmet Arif NesetConsidering the social, cultural, economic and environmental structure, source-separated collection of recyclable packaging wastes has been a huge issue for cosmopolite cities like Istanbul. To provide an effective recycling system; all source separation, collection and recycling activities should be analyzed environmentally and socially. In the scope of this study, existing and alternative municipal packaging waste management systems are analyzed and compared in terms of environmental and social impacts. The research is mainly based on a long term site observation, data collection and existing system analysis. Environmental performances of alternative scenarios are calculated based on the existing system data, whereas more site observations and interviews with stakeholders are conducted for the determination of social impacts. In the analysis of both environmental and social impacts of the scenarios, life cycle assessment used as a methodological approach. Results of the study show that informal collection systems are environmentally more effective than the formal collection systems. Even the resource consumption is high in these systems; they are still environmentally beneficial because of the high material collection rate. On the other hand, social impact assessment results indicate that informal collection system has serious social disadvantages compared to the formal systems. And finally, it is found that environmental and social weaknesses of the system could be minimized with integrated system applications.