Master Degree / Yüksek Lisans Tezleri

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Department: search.filters.department.Thesis (Master)--İzmir Institute of Technology, Environmental EngineeringPublisher: search.filters.publisher.Izmir Institute of Technology

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Now showing 1 - 10 of 34
  • Master Thesis
    Improvement of energy performance using modular green systems as a retrofitting strategy on building envelope
    (Izmir Institute of Technology, 2023) Al Chaderchi, Balsam Munadhil; Durmuş Arsan, Zeynep; Sofuoğlu, Sai̇t Cemi̇l; Arsan, Zeynep Durmuş; 02.02. Department of Architecture; 02. Faculty of Architecture; 01. Izmir Institute of Technology
    Yeni altyapının geliştirilmesi enerji tüketimini artırmaktadır. Bu nedenle doğa temelli çözümlere ihtiyaç duyulmaktadır. Modüler yeşil sistemlere (MYler) duyulan ilgi, mevcut binaları daha çevre dostu hale getirmesidir. Bu çalışma, binalarda enerji tüketimini en aza indirmek için bir iyileştireme yaklaşımı olarak prefabrik yeşil sistemler olan MY'leri araştırmayı amaçlamaktadır. İlk olarak, farklı bitkiler, malzemeler ve boyutlarla cephe ve çatı alternatifleri tasarlanmıştır. Araştırma iki aşamalıdır: ilki, ürün seviyesi, yani sistemin enerji tüketimini ve CO2 ayak izini değerlendiren yaşam döngüsü analizidir. Plastik, geri dönüştürülmüş plastik, mantar ve fiberglas modül malzemeleri, hammade eldesi, üretim, taşıma ve bertaraf aşamaları için Granta Edupack kullanılarak değerlendirilmiştir. Geri dönüştürülmüş plastik, yaşam süresi boyunca çevresel etkisi açısından en iyi malzeme olarak tespit edilmiştir. İkinci aşamada, geri dönüştürülmüş plastik, çatı için; RA1, RA2 ve RA3 ve cephe için FA1, FA2 ve FA3 iyileştirme alternatifleri ile uygulanmıştır. Enerji performans araştırması, mevcut bir bina olan IYTE Mimarlık Fakültesi, E Blok için DesignBuilder yazılımı kullanılarak yapılmıştır. Yeşil çatı ve cephe modülleri ile % 4.46-6.52 ve % 7.44-11.72 ısıtma için enerji azaltımı sağlanmıştır. Alternatif RA2'nin tüm çatı alanına (ARA2) ve FA3'ün binanın güney duvarina (SFA3) uygulanmasıyla 2773 kWh ısıtma yükünden % 12.65, 7555 kWh soğutma yükünden % 1.60, genel itibarla aylık 471.58 kWh tasarruf sağlanabileceği görülmüştür. Sonuç olarak, MY'ler, daha düşük çevresel etki, bina bazında azaltılmış ısıtma enerji tüketimi ve şehir ölçeğinde azaltılmış soğutma enerjisi sağlama potansiyeli nedeniyle yenileme stratejileri için bir seçenek olabilir.
  • Master Thesis
    Co-Production of Chitin Nanofibers, Proteins, and Lipids in Marine Diatoms Belonging To the Thalassiosira Genus
    (Izmir Institute of Technology, 2022) Özkan, Altan; Özkan, Altan; Özkan, Altan; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Chitin is a biopolymer used in various industries, including biomedical, pharmaceutical, medical, and food. Today, the vast majority of chitin is obtained from waste shellfish. Shellfish chitin has an inherent impurity problem because chitin in these organisms is embedded in other organics and inorganics. Thus, new sources have been investigated. Diatoms, particularly Thalassiosira and Cyclotella species, have the potential to be the providers for applications requiring high quality through their unique ability to biosynthesize and extrude chitin nanofibers. The primary aim of this study is to study this potential. This investigation entailed the cultivation of three Thalassiosira strains according to a standard cultivation protocol under photobioreactor conditions. The secondary aim was to assess the possibility of commercially valuable co-product generation. For this, biomass protein, lipid, and fatty acids contents were analyzed. Chitin productivity varied significantly between the strains. The peak productivities and final concentrations ranged from 4 to 25 mg/L-day and from 60 to 250 mg/L, respectively. Average fiber diameters ranged from 68.5 to 95.0 nm. Silicon limited growth increased the chitin biosynthesis in T.weissflogii 1336 and T.pseudonana 2135. Biomass lipid contents of over 45% were obtained with T.pseudonana 2135 under silicon depletion. The fatty acid profiles indicated the suitability for application as live aquaculture feed for T.weissflogii 1336, and biodiesel feedstock material for T.pseudonana 2135. The highest biomass protein contents were about 30%, which were obtained under silicon availability. This study, for the first time, assessed the chitin productivity of Thalassiosira strains and demonstrated unique multiproduct generation scenarios.
  • Master Thesis
    Inhalation Exposure To Polychlorinated Biphenyls in Izmir
    (Izmir Institute of Technology, 2022) Sofuoğlu, Sait Cemil; Sofuoğlu, Aysun; Sofuoğlu, Sait Cemil; Sofuoğlu, Aysun; 03.02. Department of Chemical Engineering; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Polychlorinated biphenyls (PCBs) are chemicals that are classified as hazardous air pollutants with carcinogenic and chronic-toxic effects on human health. People may be exposed to these chemicals indoors and outdoors via inhalation of indoor and outdoor air. Their production and use were banned worldwide with the Stockholm Convention. Since the Turkish government became an official signatory to the Stockholm Convention in year of 2010, the determination of persistent organic pollutants (POPs) in environmental compartments in Türkiye has gained importance. PCBs are still present in the environment because they are found in materials such as those used in heat transfer, electrical, and hydraulic systems manufactured before the ban due to their persistence to degradation in environment. Industrial processes have an important effect on their environmental concentrations due to unintentional emissions. Therefore, they are still present in air and investigations show that industrial and urban areas have higher levels. The aim of this study was to measure concentrations of PCB compounds in indoor-outdoor air samples collected at homes and schools, and to estimate exposure and associated carcinogenic health risks. Samples were collected at randomly selected sites in urban, semi-urban, and rural areas with polyurethane foam – passive samplers. Samples were analyzed by using gas chromatography–mass spectrometry after Soxhlet extraction. The estimated carcinogenic risks even at the 95th percentile were calculated below the acceptable risk level (10-6), indicating that the population carcinogenic risk associated with inhalation of gas-phase PCBs is not considerable. However, aggregate risks that could be estimated by addition of other plausible exposure pathways would drive the levels above the acceptable level.
  • Master Thesis
    Evaluation of Waste Management System in İzmir-Karaburun Peninsula From Sustainability Perspective
    (Izmir Institute of Technology, 2022) Hajatnia, Haniyeh; Ökten, Hatice Eser; Ökten, Hatice Eser; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Global solid waste generation is constantly rising, hence the need for management strategies that implement environmental improvements. The sustainable municipal solid waste management strategy for municipalities must include collection and transportation. The collection and transportation sector have been neglected while it is one of the most significant polluters. As a result, this study aims to model municipal solid waste transportation using Life Cycle Assessment (LCA) software which we used CCalC2 for this study and CML2001 methodology was used. To demonstrate how different approaches to waste management through transportation can reduce environmental impacts, LCA modeling was done for the three districts of Urla, Çeşme, and Karaburun, all of which are located on the Karaburun Peninsula. Each district was assigned three scenarios, with Scenario 0 representing current municipal practices, Scenario 1 representing a 50% reduction in plastic waste, and Scenario 2 representing a 50% reduction in all renewables. Results showed that only plastic separation might not be enough to achieve significant e reductions in environmental impacts. It has been demonstrated that in the transportation sector of Urla and Çeşme, Scenario 1 had a CO2 reduction of 3.7% and Karaburun had a CO2 reduction of 3.8% while Scenario 2 represented at least a 20% reduction of carbon footprint in all three districts. Findings of this research will support municipalities in the roadmaps they will choose for the Municipal Solid Waste Management applications.
  • Master Thesis
    The Use of Vetiveria Zizanioides (l) Nash and Cyperus Alternifolius L. by Floating Wetland Treatment To Improve Water Quality
    (Izmir Institute of Technology, 2018) Yücel, Arzu; Sofuoğlu, Aysun; Sofuoğlu, Sait Cemil; Sofuoğlu, Aysun; Sofuoğlu, Sait Cemil; 03.02. Department of Chemical Engineering; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The olive mill wastewater (OMW), arises during the production process of olive oil, is an important problem in all Mediterranean countries. OMW shows seasonality, and contain high organic pollutant. Eventhough various methods have been studied for the treatment, olive oil producers neither can afford the cost of these methods, nor it can provide the discharge standards. The capacity of phytoremediation of Vetiveria zizanioides (L.) Nash (vetiver) and Cyperus alternifolius L. (umbrella palm) species was evaulated in the treatment of OMW by floating treatment wetland (FTW) method. The 5 and 15% concentrations of OMW (OMW-5 and OMW-15) were remediated by these plants, and unplanted sets as triplicates for 67 days to determine their organic and nitrogen reduction. Therefore, total organic carbon (TOC), total phenol and total nitrogen (TN) in the OMW were measured. The amount of biomass at the beginning of the experiment were 2.5 and 4.0 kg OMW-5 and OMW-15 respectively. The highest biomass growth rate (149%) and total phenol accumulation in plant (439%) were observed in umbrella palm. The results showed that umbrella palm achieved 95%, 99%, 82% removal in TOC, total phenol, TN while these removals were 85%, 93%, 40% in vetiver planted OMW-5 tanks. Similarly, the removal in OMW-15 were comparable with 90, 97, 41 percentages with umbrella palm and 79, 92, and 21 percentages for vetiver respectively. As a result, it seems that umbrella palm and vetiver have potential in diluted OMW treatment by FTW for future.
  • Master Thesis
    Exposure and Risk Assessment for Arsenic in Simav Plain by Ingestion of Edible Crops
    (Izmir Institute of Technology, 2017) Terzi, Begüm; Sofuoğlu, Sait Cemil; Gündüz, Orhan; Sofuoğlu, Sait Cemil; Gündüz, Orhan; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Ingestion is the main route of exposure to arsenic. The pathways of concern are ingestion of drinking water and arsenic-accumulating plants. Simav plain has been shown to have the natural arsenic conamination of waters and soil. However, foodstuff was not made a subject of investigation. In this study, arsenic exposure via ingestion of edible plants cultivated in Simav plain was investigated based on the modeling of the measured soil concentrations and data collected from the literature, which were for bioconcentration factors, plant consumption rates, background arsenic concentrations in plants, plant root depths, and body weights. Eighteen plant species, which are bean, broccoli, cabbage, carrot, cauliflower, corn, cucumber, eggplant, garlic, lettuce, okra, onion, potato, radish, spinach, sunflower seed, tomato, and wheat were studied. Chronic-toxic and carcinogenic risks associated with the consumption contaminated foodstuff were assessed with two approaches: scenario based point estimates (deterministic approach) and population based estimates (probabilistic approach). Monte Carlo simulation was used to determine chronic-toxic and carcinogenic risks via ingestion of edible plants probabilistically. Wheat was found as the plant variety with the highest non-carcinogenic and carcinogenic risks which was followed by potato, tomato, cucumber, corn, cabbage, eggplant, and onion. Non-carcinogenic risk levels for broccoli, cauliflower, garlic, and radish were below the threshold level. However, their carcinogenic risk levels were considerable. The risk levels estimated in this study are exceptionally high, indicating consumption of the plants cultivated in Simav may pose significant chronic-toxic and carcinogenic health risks.
  • Master Thesis
    B and Se Transport Modeling in Saturated/Unsaturated Zones
    (Izmir Institute of Technology, 2002) Yüreklitürk, O. Emin; Tayfur, Gökmen; Tayfur, Gökmen; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    There has been renewed interest in the application of models to the transport of non-point source pollutants. However, very little work has been done to evaluate the performance of a functional transient-state model for the transport of a reactive solute over an extensive study period. This research consists of mathematical modeling to simulate water flow, boron and selenium transport through soil in tile-drained croplands.For Boron part a mathematical model was developed to simulate non-conservative boron transport. The dynamic two-dimensional finite element model simulates water flow and boron transport in saturated-unsaturated soil system, including boron sorption and boron uptake by root-water extraction. Two different models have been employed for the sorption of boron. Similarly, for selenium part a finite element model is developed to simulate species of selenium transport in two dimensions in saturated/unsaturated zones. The model considers water, selenate, selenite and selenomethionine uptake by plants. It also considers oxidation/reduction, volatilization, and chemical and biological transformations of selenate, selenite, and selenomethionine. Comparison of boron transport model results with observed data is satisfactory. The model employed with Langmuir isotherm was found to give slightly better simulation results when compared with the model employed with Freundlich. The sensitivity analysis results indicate that the irrigation scheduling and the irrigation water quality are very important parameters for boron accumulation in the soil. Also the adsorption isotherm parameters, which reflect us the soil properties, are found to be important for the boron movement in the soil. Comparison of selenium transport model with observed data is not quite satisfactory in accuracy when compared with the model for boron transport. This may be the result of the complexity of the mechanisms affecting the selenium transport in soil. There are too many parameters, and due to the errors depending on the parameters, the total error for the estimation of the total selenium increases.
  • Master Thesis
    The Investigation of Seawater Intrusion of Coastal Aquifer in Karareis (karaburun Peninsula)
    (Izmir Institute of Technology, 2016) Mansour, Ahmed Y. S.; Baba, Alper; Gündüz, Orhan; Baba, Alper; Gündüz, Orhan; 03.07. Department of Environmental Engineering; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Seawater intrusion is a major problem to freshwater resources especially in coastal areas where fresh groundwater is surrounded and could easily be influenced by seawater. This study presents the development of conceptual and numerical model for the coastal aquifer of Karareis region in the western part of Turkey. The study also presents the interpretation and the analysis of the groundwater levels recorded by groundwater data loggers. Groundwater pumping from Karareis aquifer has increased significantly during the summer period to meet the agriculture and domestic water demands. Levels of groundwater were measured at nine locations in Karareis region; also water samples were collected and analyzed for some parameters. For this study SEAWAT code is used to solve the numerical model for the coupled density dependent flow system. The model was calibrated using the average of one-year dataset of collected groundwater levels. Model validation was handled using the average of groundwater levels measured over more one year. Five scenarios were tested to understand the effects of pumping and climate change on groundwater levels and seawater intrusion in the next ten years. The result of analysis demonstrated a high concentration of electrical conductivity and chloride along the coastal part of the study area. As a result of the numerical model, seawater intrusion will extent about 420 m towards the land in the next ten years of increased pumping scenario, while a little change in water level and TDS concentration was recognized in climate change scenario. Results also showed that reducing the pumping from Karareis wells will be necessary to protect the freshwater from contamination by seawater.
  • Master Thesis
    Environmental Impact and Capacity Analysis of Renewable Energy Resources: Case Study of Wind Energy in Turkey
    (Izmir Institute of Technology, 2016) Bingöl, Ferhat; Bingöl, Ferhat; Sofuoğlu, Sait Cemil; Bingöl, Ferhat; Sofuoğlu, Sait Cemil; 03.07. Department of Environmental Engineering; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The majority of electricity in Turkey is generated from coal and natural gas; however, renewable energy, especially wind power, is a promising energy source for Turkey. Development of new wind energy project requires complex planning process involving many social, technical, economic, environmental, political concerns and different agents such as investors, utilities, governmental agencies or social groups. To address the proper site selection, a Geographic Information System (GIS) based Multi- Criteria Decision-Making (MCDM) method has been used in previous studies. The aim of this study is to develop a GIS-based multi-criteria decision making application which can be updated by the changing regulations to identify potential sites for wind power plants in Turkey. A variety of constraints and factors were identified based on a literature review, regulations and gathered from variety of agencies. After excluding of infeasible sites, pairwise comparisons was carried out using analytic hierarchy process (AHP) as MCDM method by the study group to estimate relative importance of the criteria. The suitability map obtained from MCDM analysis was divided into four classes from the low suitable to extremely suitable area. As a final stage, decision making was carried out with the objectives by environmental impact approach. The output of this study can be used by energy planners to estimate the extent that wind energy can be developed based on public perception, administrative and environmental aspects.
  • Master Thesis
    Persistent Organic Pollutants in Turkey's Atmosphere: Spatial Variation
    (Izmir Institute of Technology, 2015) Çiçek, Tuğba; Sofuoğlu, Sait Cemil; Sofuoğlu, Sait Cemil; Kurt Karakuş, Perihan Binnur; 03.07. Department of Environmental Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The objectives of this study was to measure ambient air levels of 43 PCBs and 22 OCPs in 16 cities at urban and background sites by using polyurethane foam discs (PUF) as passive air samplers (PAS), to investigate spatial variations, and to generate a baseline database which is the first large-scale nationwide database for POP residues in air of Turkey. Air sampling was conducted from May 2014 to April 2015 with three-month sampling periods. Samples were analyzed by gas chromatography - mass spectrometry after extraction, clean-up, and volume reduction. The one-year overall average Σ43PCBs concentration was 108±132 pg/m3. The one-year average of Σ43PCBs ranged from 14.5±14.3 pg/m3 (Kayseri) to 403±428 pg/m3 (İzmir) at urban sites with a mean of 116±141 pg/m3, and from 19.0±22.7 pg/m3 (Aksaray) to 217±353 pg/m3 (Kastamonu) at rural sites with a mean of 101±122 pg/m3. PCB 118 had the highest mean concentration (26.3±44.6 pg/m3) among the 43 PCB congeners. The PCB homologue group with the highest contribution was penta-CBs with 54.3%. Overall one-year average Σ22OCPs concentration was 341±870 pg/m3 with a range of 55.3±36.5 pg/m3 (Çankırı) and 1294±2153 pg/m3 (Kırklareli). ΣDDT had the highest overall mean level with 134±296 pg/m3 among the OCP groups. The highest concentration OCPs were p’p-DDE (97.6±236 pg/m3), HCB (45.3±197 pg/m3), α-HCH (22.0±92.8 pg/m3), β-HCH (21.8±96.1 pg/m3), and p’p-DDT (21.3±77.4 pg/m3). Principle Components Analysis showed that, in addition to the OCP with the highest concentration (p’p-DDE), parent OCP compounds such as α-endosulfan, α-HCH, HCB, and p’p-DDT differed from the others, and some of the remaining decay products were grouped together indicating similar behavior. Highly chlorinated PCBs were clustered together. Mann-Whitney U test indicated that the difference in the median concentrations of urban and rural sites was not significant. It was also used to test the significance of temperature effect on the median concentrations at a high and a low temperature range. The medians were significantly different for HCB, dieldrin, p’p-DDT, and β-endosulfan at urban sites but not significant for the remaining OCPs and ΣPCBs. The difference in the medians was significant for HCB, heptachlor, dieldrin, endrin, p’p-DDE, Mirex, and ΣPCBs at rural sites