İnşaat Fakültesi

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  • Öge
    Tailoring a geomodel for analyzing an urban skyline
    (Science Direct, 2012-03-30) Güney, Caner ; Girginkaya Akdağ, Suzan ; Çağdaş, Gülen ; Yavuz, Sinem ; 0000-0002-1620-1347 ; Geomatic Engineering
    A skyline is a unique fingerprint of a city. The mentalities, diversity, and cultures in a city can often be perceived from its skyline. Istanbul's iconic skyline forms an essential part of the character and appearance of this mega city, so much so that Istanbul's historical silhouette is instantly recognizable; it is a unique asset that is important to protect. Impressive minarets and domes dominate the skyline of Istanbul. On the other hand, Istanbul's skyline has changed dramatically over the last decade since land has become increasingly an opportunity for investment and building of taller structures has become one way to multiply this profit. For those who focus on the esthetics of cities, the analysis of the skyline is not a recent phenomenon. However, skyline extraction and analysis has not usually been available in current GIS functionality. This article investigates the esthetics the urban skyline and its transformation due to high-rise buildings. It does this by tailoring a geomodel within a GIS environment. It is believed that the geomodel developed in this study will form a solid foundation which can be applied to many of the urban skylines and urban areas in Turkey and other cities of the world.
  • Öge
    Proceedings of IWAMISSE 2018 the International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Seismic Practices
    (İstanbul Teknik Üniversitesi, 2018-11) İnşaat Mühendisliği ; İlki, Alper ; Cavunt, Derya
    The International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Seismic Practices, IWAMISSE 2018, is co-organised by The International Federation for Structural Concrete Turkey Branch, fib-Turkey, and Istanbul Technical University, ITU, on November 16, 2018 at ITU. The International Federation for Structural Concrete, fib, is a not-for-profit association formed by 45 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction. Istanbul Technical University (ITU) was established in 1773 and is a state university which defined and continues to update methods of engineering and architecture in Turkey. It provides its students with innovative educational facilities while retaining traditional values, as well as using its strong international contacts to mould young, talented individuals who can compete not only within their country borders but also in the global arena. With its educational facilities, social life and strong institutional contacts, ITU has always been preferred by Turkey’s most distinguished students since its foundation and has achieved justified respect. The workshop covers the topics of advanced materials and innovative systems in structural engineering with a focus on seismic practices as well as other issues related with steel fiber reinforced concrete, anchors/fasteners, precast structures, and recent advances on different types of structural systems such as reinforced concrete, steel, and reinforced masonry structures. This proceeding book contain sixteen papers from ten countries worldwide. We have no doubt that the up-to-date subjects covered during the workshop will be extremely beneficial for the workshop participants both from academia and industry. We would like to thank all authors for their contributions to the workshop as well as the members of the International Scientific Committee for their rigorous work for reviewing the papers. We also gratefully acknowledge the support of the sponsoring companies and we express our sincere thanks to organization committee for their tireless efforts in the overall organization of the workshop. Many thanks go as well to undergraduate and graduate students from ITU for their assistance during all stages of the workshop.
  • Öge
    Proceedings of IWAMISSE 2019 2nd International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Novel Researches
    (The International Federation for Structural Concrete Turkey Branch, 2019-09) ITU Structural Engineering ; İlki, Alper ; Çavunt, Yavuz Selim
    The Second International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Novel Researches, IWAMISSE 2019, is co-organised by The International Federation for Structural Concrete Turkey Branch, fib-Turkey, and Istanbul Technical University, ITU, on September 20, 2019 at ITU. The International Federation for Structural Concrete, fib, is a not-for-profit association formed by 42 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction. Istanbul Technical University (ITU) was established in 1773 and is a state university which defined and continues to update methods of engineering and architecture in Turkey. It provides its students with innovative educational facilities while retaining traditional values, as well as using its strong international contacts to mould young, talented individuals who can compete not only within their country borders but also in the global arena. With its educational facilities, social life and strong institutional contacts, ITU has always been preferred by Turkey’s most distinguished students since its foundation and has achieved a justified respect. The workshop covers the topics of advanced materials and innovative systems in structural engineering with a focus on seismic practices as well as other issues related with steel fiber reinforced concrete, anchors/fasteners, precast structures, and recent advances on different types of structural systems such as reinforced concrete, steel, and reinforced masonry structures. This event which is organized for the second time will provide a platform for exploring the potential national and international cooperation schemes in terms of research and application on the areas covered within the scope of the workshop. A part of this workshop is devoted to papers presenting the initial outcomes of the TUBITAK-RCUK Project “Rapid Earthquake Risk Assessment and Post-Earthquake Disaster Management Framework for Substandard Buildings in Turkey” coordinated jointly by Istanbul Technical University and Sheffield University. This proceeding book contains twelve papers from five countries worldwide. We have no doubt that the up-to-date subjects covered during the workshop will be highly beneficial for the academicians and practitioners in the field. We would like to thank all authors for their contributions to the workshop as well as the members of the International Scientific Committee for their rigorous work for reviewing the papers. We also gratefully acknowledge the support of the sponsoring companies and we express our sincere thanks to organization committee for their tireless efforts in the overall organization of the workshop. Many thanks go as well to undergraduate and graduate students from ITU for their assistance during all stages of the workshop.
  • Öge
    Proceedings of IWAMISSE 2019 2 nd International Workshop on Advanced Materials and Innovative Systems in Structural Engineering: Novel Researches
    (The International Federation for Structural Concrete, İTÜ, 2019-09-20) İnşaat Mühendisliği ; Çavunt, Yavuz Selim
    The workshop covers the topics of advanced materials and innovative systems in structural engineering with a focus on seismic practices as well as other issues related with steel fiber reinforced concrete, anchors/fasteners, precast structures, and recent advances on different types of structural systems such as reinforced concrete, steel, and reinforced masonry structures. This event which is organized for the second time will provide a platform for exploring the potential national and international cooperation schemes in terms of research and application on the areas covered within the scope of the workshop. A part of this workshop is devoted to papers presenting the initial outcomes of the TUBITAK-RCUK Project “Rapid Earthquake Risk Assessment and Post-Earthquake Disaster Management Framework for Substandard Buildings in Turkey” coordinated jointly by Istanbul Technical University and Sheffield University. This proceeding book contains twelve papers from five countries worldwide.
  • Öge
    9. Türkiye Deprem Mühendisliği Konferansı Bildiriler Kitabı, 2-3 Haziran 2021, İstanbul
    (TMMOB, Türkiye Deprem Vakfı, 2021-06-02) İnşaat Mühendisliği ; Tönük, Gökçe ; Dalgıç, Korhan Deniz ; Halıcı, Ömer Faruk
    Depremde oluşan yapısal hasar dağılımları ile yerel zemin koşulları arasında yakından ilişki olduğu gözlenmiştir. Son 60-70 yılda hasar dağılımları yanında, aletsel ölçümlerle de kanıtlanan bu ilişki, çok disiplinli deprem mühendisliği dalında içinde geoteknik deprem mühendisliği alt dalının gelişmesine yol açmıştır. Yerel zemin koşullarının deprem etkisinde yapısal davranış üzerinde etkileri iki ana başlık altında toplanabilmektedir: (1) tekrarlı(çevrimli) deprem yükleri altında temel zemininde ortaya çıkabilecek taşıma gücü kaybı, aşırı oturmalar ve yer değiştirmeler; (2) deprem hareketi özelliklerinde meydana gelen değişimler ve buna bağlı olarak yapının maruz kaldığı sarsıntı şiddeti ve atalet kuvvetlerinde meydana gelen değişimler. Deprem hasarlarının azaltılmasına yönelik çalışmalarda deprem yükleri etkisinde zeminlerin davranışının incelenmesi (dinamik zemin özelliklerinin belirlenmesi) için laboratuvar deney yöntemlerinde önemli gelişmeler yaşanırken, zemin davranışını modellemeye yönelik bünye denklemleri ve analiz yöntemleri de geliştirilmiştir.
  • Öge
    Marmara Denizi'nde Deniz Salyası Sorunu ile İlgili Görüş ve Öneriler
    (İstanbul Teknik Üniversitesi, 2021-06-18) Öztürk, İzzet ; Yanalak, Mustafa ; Arslan, Özcan ; Koyuncu, İsmail ; Dilekgürgen, Ebru ; Erşahin, Mustafa Evren ; Türken, Türker ; https://orcid.org/0000-0002-8274-5326 ; Çevre Mühendisliği
    Müsilaj doğrudan bir kirlilik olmayıp, birçok farklı alanda zincirleme olarak olumsuzlukların tetiklenmesine neden olmaktadır (Şekil 1 ve Şekil 2). Bu olumsuzluklar arasında deniz canlılarının yok olması, balıkçılığın olumsuz etkilenmesi, deniz ve kıyı turizminin zarar görmesi, gemi ve deniz araçlarının zarar görmesi, atmosfere zararlı gazların salınması sayılabilir. Müsilaj oluştuktan sonra, çeşitli deniz vasıtaları ve sistemleri ile sınırlı şekilde denizden toplanmasından başka çözüm olmadığından, müsilajın oluşumuna neden olan faktörleri yok etmek en uygun çözüm olacaktır.
  • Öge
    Nadir Toprak Elementleri ve Atıklardan Geri Kazanımı Çalıştayı Bildiri Kitabı, İstanbul, 2021
    (İstanbul Teknik Üniversitesi, 2021-12-01) Çevre Mühendisliği ; Koyuncu, İsmail ; Köse Mutlu, Börte ; Yüksekdağ, Ayşe ; Tuncay, Gizem ; Akça, Tuğçe
    Nadir Toprak Elementleri bilgisayar, cep telefonu, floresan lambalar, bataryalar gibi elektrikli ve elektronik ürünlerden, rüzgâr türbinleri, güneş panelleri gibi yenilenebilir enerji ürünlerine kadar birçok sektörde kullanılan bir element grubudur. Nadir toprak elementlerine yönelik talep gün geçtikçe artmaktadır. Nadir toprak elementlerinin mevcut rezervlerden elde edilmesinin yanı sıra ekonomik modelin lineerden döngüsele geçmesiyle beraber nadir toprak elementlerinin sürdürülebilirlik kavramı çerçevesinde ülkemizde ve dünyada geri kazanımı için çalışmalar yapılmaktadır. İTÜ Çevre Mühendisliği Bölümü ve MEM-TEK Ulusal Membran Teknolojileri Araştırma Merkezi bünyesinde, bu elementlerin döngüsel ekonomi çerçevesinde çeşitli atık, atıksu ve ikincil kaynaklardan geri kazanımına dair yürütülen 11Y357 no’lu TÜBİTAK 1001 projesi kapsamında “Nadir Toprak Elementleri ve Atıklardan Geri Kazanımı Çalıştayı” organize edilmiştir.
  • Öge
    CICE 2020/2021 Abstract Book
    (International Institute for FRP in Construction, 2021-12-08) Ilki, Alper ; Ispir, Medine ; Inci, Pınar
    This book includes the abstracts of 216 papers from 34 countries and other relevant information about CICE 2020/2021 conference. The great contributions of our keynote speakers, invited theme lecturers and all speakers are highly appreciated. The quality of the contributions submitted to CICE 2020/2021 was very high, and as organizers we had the chance to invite more than 100 papers to special collections/issues of ASCE Journal of Composites for Construction, Construction and Building Materials Journal, and Turkish Journal of Civil Engineering based on the suggestions of the reviewers
  • Öge
    Deprem risk yönetiminde yazılım ve deprem mühendisliği çalıştayı bildiriler kitabı
    (İTÜ Yayınevi, 2022-05-26) Deprem Risk Yönetiminde Yazılım ve Deprem Mühendisliği Çalıştayı: 2022 ; İnşaat Mühendisliği ; Baş, Selçuk ; Püskülcü, Seyhun ; İlki, Alper ; Akşit, Mehmet
    "Deprem olgusu, ülkemiz için göz ardı edilemeyecek bir gerçekliktir. Son yıllarda yazılım, sistem mühendisliği ve yapay zekâ alanlarında gözlemlenen gelişmeler, deprem mühendisliği alanında yürütülen çalışmalarda da etkinliğini arttırmaktadır. Bu amaçla, ülkemizde deprem mühendisliği alanında yurtiçi/yurtdışı birçok bilimsel aktiviteye öncülük eden Türkiye Deprem Vakfı (TDV), deprem risklerinin yönetimi konusunda yazılım mühendisliği ve deprem mühendisliği alanlarında çalışan uzmanları bir araya getirmek amacıyla 26 Mayıs 2022 tarihinde, “Deprem Risk Yönetiminde Yazılım ve Deprem Mühendisliği (YDMÇ-2022)" çalıştayını çevrim içi olarak düzenlemiştir. Çalıştaya internet üzerinden 252 kişi kaydolmuştur. Bizim tespitlerimize göre, bu toplantı sözü geçen konuda dünyada düzenlenen ilk çalıştaydır."
  • Öge
    Assessment of Microbial Diversity during Thermophilic Anaerobic Co-Digestion for an Effective Valorization of Food Waste and Wheat Straw
    ( 2022-12-21) Yangın Gömeç, Çiğdem ; Agnihotri, Swarnima ; Ylitervo, Päivi ; Sárvári Horváth, Ilona ; 0000-0003-3519-4821 ; Environmental Engineering
    In this study, predominant bacterial and archaeal populations and their roles during anaerobic mono-digestion of food waste (FW) and co-digestion of FW with straw pellets (SP) at thermophilic temperature (53 ± 1 °C) were assessed by Next Generation Sequencing (NGS) analysis at organic loading rates (OLRs) of 3.0 and 7.0 gVS/L/d. Depending on the seed; results revealed that Firmicutes, Bacteroidetes, and Proteobacteria were, respectively the most prevalent bacterial phyla at both OLRs investigated. On the other hand, Euryarchaeota was dominated by methanogens playing crucial role in biogas production and correlated mainly with the activities of Methanobacteria and Methanomicrobia at class level. Acetoclastic Methanosaetae was the predominant genus at OLR = 3.0 gVS/L/d; however, shared the same predominance with hydrogenotrophic methanogens Methanospirillium at the highest OLR. Although no clear effect in response to straw addition at OLR of 3.0 gVS/L/d could be seen in terms of methanogenic archaea at genus level, hydrogenotrophic methanogens revealed some shift from Methanobacterium to Methanospirillium at higher OLR. Nevertheless, no prominent microbial shift in the presence of wheat straw at increased OLR was likely due to adapted inoculation at start-up which was also demonstrated by relatively stable biogas yields during co-digestion.
  • Öge
    fib Symposium 2023, Istanbul - Building for the future : durable, sustainable, resilient : book of abstracts
    (İTÜ Yayınevi, 2023) İnşaat Mühendisliği ; İlki, Alper ; Çavunt, Derya ; Çavunt, Yavuz Selim
    Concrete is a widely used material in the construction industry due to its versatility, strength, and durability. However, the production of concrete has a significant impact on the environment, contributing to carbon emissions, resource depletion, and waste generation. This has led to an increasing need to address sustainability concerns in the construction industry. As the world population grows and the impact of climate change becomes more severe, the demand for sustainable buildings has also increased. Sustainable buildings minimize their environmental impact by reducing resource consumption, minimizing waste generation, and improving energy efficiency. Moreover, durable and resilient structures are crucial aspects of sustainable construction. Structures that can withstand the test of time and natural disasters reduce the need for frequent repairs and replacements, thereby reducing the resources needed for ongoing maintenance. Sustainable structures also provide long-term financial benefits by reducing operational costs. This is achieved through measures such as energy-efficient designs and the use of sustainable materials. In this aspect, it is essential for the construction industry to prioritize sustainability to ensure a better future for the world.
  • Öge
    Analysis of particle size distribution of organic carbon for landfill leachate : implications for sustainable treatment
    (Wiley, 2023) Doğruel, Serdar ; Kaya, Beste ; Soylu, Dilşad ; Çokgör, Emine ; Baran, Aydın ; Sözen, Seval ; Orhon, Derin ; orcid.org/0000-0003-4214-8436 ; orcid.org/0000-0001-6158-4132 ; orcid.org/0000-0002-5417-0318 ; orcid.org/0000-0002-4904-6056 ; orcid.org/0000-0003-2027-604X ; orcid.org/0000-0002-6823-3498 ; Çevre Mühendisliği
    BACKGROUND Landfill leachate has a complex composition requiring experimental support to formulate a sustainable treatment strategy. This study utilized the particle size distribution (PSD) of the chemical oxygen demand (COD) content to assess the profile of biodegradable and inert COD fractions; it also emphasized the functions and benefits of ultrafiltration and nanofiltration modules coupled to an activated sludge process. The evaluation profited from the field data of a landfill site in Istanbul, where the leachate was actually treated in a membrane bioreactor (MBR) plant. RESULTS COD and total nitrogen levels fluctuated between 10 100–31 200 mg L−1 and 1150–2800 mg L−1, respectively. PSD analysis for COD, conducted at two extremes, displayed similar results, where the majority of the COD was observed to accumulate at the low extremity of the particle size, 70–72% below 2 nm. Therefore, direct membrane filtration of leachate yielded low COD removals that were limited to 9% with ultrafiltration and to 31–35% with nanofiltration. COD fractionation indicated a ratio of 5% for the inert COD in leachate. The permeate COD of ultrafiltration in the existing plant was 2000 mg L−1, much higher than the inert fraction ratio, which was further reduced to 266 mg L−1 by nanofiltration. CONCLUSION PSD analysis was an integral complement of respirometry for establishing the size-biodegradation relationships of different COD fractions. It located the majority of soluble COD fractions below 0.55 nm, thus implying the necessity of a biological process. PSD also identified the generation of soluble residual metabolic products, indicating that residual COD escaping treatment would be equally significant to the removal potential of the biodegradable substrate.
  • Öge
    Specific ammonium oxidation and denitrification rates in an MBR treating real textile wastewater for simultaneous carbon and nitrogen removal
    (Wiley, 2023) Yılmaz, Tülay ; Demir, Emir Kasım ; Teksoy Başaran, Senem ; Ubay Çokgör, Emine ; Sahinkaya, Erkan ; orcid.org/0000-0003-2416-9890 ; orcid.org/0000-0002-4904-6056 ; Çevre Mühendisliği
    BACKGROUND Dissolved oxygen (DO) and aeration on/off time are the determining parameters for simultaneous carbon and nitrogen removal in biological treatment processes. The most effective way to decide the optimum operational conditions, e.g. aeration on/off time or DO concentration during the aeration period, is to determine specific nitrification/denitrification rates. For this purpose, the effects of DO (6 and 3 mg L−1) and aeration on/off time (from 2/2 to 90/360 min) on the specific ammonium oxidation and denitritation/denitrification rates in a membrane bioreactor (MBR) treating real textile wastewater were deeply investigated. RESULTS The highest specific ammonium oxidation, denitritation and denitrification rates were obtained as 5.4, 3.8, and 5.3 mg N g−1 volatile suspended solids h−1, respectively, at an aeration on/off time of 90/360 min, which corresponded to the increase in specific ammonium oxidation rates by 1.8 and 2.1 times compared to continuous aeration conditions where DO was 6 and 3 mg L−1, respectively. CONCLUSION Higher specific ammonium oxidation and denitrification rates can be achieved with the intermittent aeration compared to continuous aeration. Hence existing treatment plants can be retrofitted for higher performance with reduced energy requirements. © 2023 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).
  • Öge
    Energy Production from Biomass Valorization
    ( 2023-05-24) Yangın Gömeç, Çiğdem ; Sárvári Horváth, Ilona ; Martin, Carlos ; 0000-0003-3519-4821 ; Environmental Engineering
  • Öge
    Water exchange in the Dardanelles : variations on synoptic to interannual time scales
    (Springer, 2024) Saçu, Şehriban ; Şen, Olgay ; Erdik, Tarkan ; Öztürk, İzzet ; Stanev, Emil V. ; 0000-0001-9404-8424 ; 0000-0003-2545-3746 ; 0000-0002-4003-5510 ; 0000-0002-8274-5326 ; 0000-0002-1110-8645 ; Çevre Mühendisliği
    The bidirectional mass exchange between the Marmara Sea and the Aegean Sea provides one part of the critical hydrodynamic links between the Black Sea and the Mediterranean Sea. In this study, we examined exchange in the Dardanelles based on a 3-D numerical model simulation covering an 11-year period under realistic atmospheric forcing. The model includes the Black Sea, the Marmara Sea, and a part of the Aegean Sea to include the remote effects of basin dynamics. The main features as one-, two-, and three-layered flow structures are successfully reproduced by the model in comparison to earlier observations. It is found that the strait is subject to submaximal exchange by only one control near the Nara Pass. According to long-term modeling results, most variability occurs on synoptic time scales, and wind stress has a dominant role in those variations. The seasonal and interannual variability of exchange flow is relatively low and displays a close relationship with freshwater input to the Black Sea.
  • Öge
    Impact of food waste addition in energy efficient municipal wastewater treatment by aerobic granular sludge process
    (Springer, 2024) Çiçekalan, Büşra ; Berenji, Nastaran Rahimzadeh ; Aras, Muhammed Furkan ; Güven, Hüseyin ; Koyuncu, İsmail ; Erşahin, Mustafa Evren ; Özgün, Hale ; 0000-0002-1806-9917 ; 0000-0001-6431-383X ; 0000-0002-0811-9001 ; 0000-0001-6754-0106 ; 0000-0001-8354-1889 ; 0000-0003-1607-0524 ; 0000-0001-8784-8351 ; Çevre Mühendisliği
    Recently, one of the main purposes of wastewater treatment plants is to achieve a neutral or positive energy balance while meeting the discharge criteria. Aerobic granular sludge (AGS) technology is a promising technology that has low energy and footprint requirements as well as high treatment performance. The effect of co-treatment of municipal wastewater and food waste (FW) on the treatment performance, granule morphology, and settling behavior of the granules was investigated in the study. A biochemical methane potential (BMP) test was also performed to assess the methane potential of mono- and co-digestion of the excess sludge from the AGS process. The addition of FW into wastewater enhanced the nutrient treatment efficiency in the AGS process. BMP of the excess sludge from the AGS process fed with the mixture of wastewater and FW (195 ± 17 mL CH4/g VS) was slightly higher than BMP of excess sludge from the AGS process fed with solely wastewater (173 ± 16 mL CH4/g VS). The highest methane yield was observed for co-digestion of excess sludge from the AGS process and FW, which was 312 ± 8 mL CH4/g VS. Integration of FW as a co-substrate in the AGS process would potentially enhance energy recovery and the quality of effluent in municipal wastewater treatment.
  • Öge
    Disaster management with cloud-based geographic information systems : site selection of landfill areas after Kahramanmaraş, Türkiye earthquake sequence
    (Springer, 2024) Mete, Muhammed Oğuzhan ; Bıyık, Muhammed Yahya ; 0000-0002-9312-1965 ; 0000-0001-9848-9673 ; Harita Mühendisliği
    On February 6, 2023, the earthquakes centered on Kahramanmaraş-Pazarcık and Kahramanmaraş-Elbistan affected several provinces in the region and generated a vast amount of demolition waste. This study aims to develop a site selection model for the most suitable landfill areas after the earthquake using open-source Geographic Information Systems (GIS) software and the Best-Worst Method (BWM). First, the study identifies decision criteria with a Delphi expert panel. Next, it determines the weights using the BWM based on pairwise comparison. Spatial data of the determinants were obtained from open data portals, and proximity, overlay, and slope analyses were carried out for the disaster region. Combining the output data layer of each criterion, a suitability map of the landfills was produced. As a result, 36,2% (29,826 kms square) of the study area was classified as suitable and very suitable. In this study, a cloud GIS-based decision support platform was developed to act quickly and initiate recovery processes within the scope of disaster management of the destructive earthquake. The suitability map and potential sites were shared with the responsible teams in the disaster area so that the potential sites could be displayed on the map and the suitable areas could be navigated on appropriate routes. The findings of the study revealed that the use of open data and cloud GIS framework in the disaster management process enables quick, reliable, and cost-effective actions in the immediate aftermath of disasters.
  • Öge
    Design and nonlinear dynamic response of a steel stack
    (Springer, 2024) Vatansever, Cüneyt ; Çayır, Haşim ; 0000-0002-9954-925X ; 0000-0001-8131-4703 ; İnşaat Mühendisliği
    Industrial stacks are built in order to reduce atmospheric pollution and release gases to the higher level of the atmosphere. Since they are high and slender structures, they are significantly affected by lateral forces, in particular, induced by winds and earthquakes. This paper aims to summarize the design principles for steel stacks given in the international standards, codes and specifications considering the evaluation of the results from the investigation on nonlinear dynamic response of a typical steel stack subjected to the earthquake. For this purpose, a typical self-supporting steel stack has been designed and its performance under earthquake and wind forces has been investigated in terms of the applied design principles, such as the displacement limit and the potential plastic deformations. The study is accomplished by using finite element models employing nonlinear time history and pushover analyses. The numerical results are presented particularly by considering the design principles used for the model. The results show that wind loads considered are more pronounced in the design of industrial steel stacks than earthquake especially in terms of limiting top displacement. The flue openings which reduce strength and lateral stiffness of the stack web is significantly effective in the lateral behavior of the stack. Moreover, the principles considered are found applicable for the design of such steel stacks. Based on the results from nonlinear time history analyses, no yielding and plastic deformation are detected along the stack.
  • Öge
    Effect of photocatalytic pretreatment on the membrane performance in nanofiltration of textile wastewater
    (Springer, 2024) Korkut, Sevde ; Ormancı-Acar, Türkan ; Keskin, Başak ; Ağtaş, Meltem ; Karahan, Özlem ; Demir, Tuğba U. ; Ünal, Serkan ; Menceloğlu, Yusuf Z. ; Koyuncu, İsmail ; Çevre Mühendisliği
    Traditional methods like biological treatment, flocculation-coagulation, adsorption, and advanced oxidation are commonly employed for textile wastewater treatment, but their sustainability is hindered by issues such as the adverse impact of textile wastewater on microorganisms and the requirement for substantial chemical usage. In response to increasingly stringent legal discharge standards, membrane technologies are emerging as prominent alternatives for effective textile wastewater treatment. The application of photocatalysis as a pretreatment to improve effluent quality and treatment performance has shown effective results in the treatment of textile wastewater by nanofiltration (NF). However, innovative solutions are needed to improve the efficiency of UV photocatalytic reactors. Here, the TiO2/halloysite nanotube (HNT) photocatalyst was shown to completely remove dyes under UV illumination. Two wastewater samples from photocatalytic (PC) pretreatment were treated using innovative NF membranes with different contents. The study examined the impact of PC pretreatment on the flux of wastewater from a textile factory heat recovery tank, which increased from 18.32 to 27.63 L/m2.h. The membranes achieved > 98% removal in COD, while bare membrane achieved 95% removal in conductivity. The addition of s-DADPS as monomer and HNT as nanoparticles to the membranes with different compositions affected the cross-linking in the TFC layer. During the tests conducted on the water extracted from the dyeing tank, the color was completely eliminated without any loss of flux. Additionally, improvements in COD removal were observed.
  • Öge
    Enhanced energy recovery in municipal wastewater treatment plants through co-digestion by anaerobic membrane bioreactors : current status and future perspectives
    (Springer, 2024) Cengiz, Ali İzzet ; Güven, Hüseyin ; Özgün, Hale ; Erşahin, Mustafa Evren ; 0000-0002-4715-9567 ; 0000-0001-6754-0106 ; 0000-0001-8784-8351 ; 0000-0003-1607-0524 ; Çevre Mühendisliği
    Today, the transition to renewable energy from conventional energy practices is more important than ever to establish energy security and mitigate climate change. The wastewater treatment plants (WWTP) consume a remarkable amount of energy and cause significant greenhouse gas emissions. The energy balance of WWTP can be improved by implementing energy-efficient applications such as anaerobic digestion. However, most of the existing WWTPs utilize only sewage sludge in conventional anaerobic digesters (CAD) which results in low biogas generation. Generally, co-digestion is indicated as an effective solution for the low biogas generation faced in mono-digestion. Moreover, recently, anaerobic membrane bioreactors (AnMBR) have been promoted as a prominent alternative to CADs. This paper overviews the current situation of co-digestion applications by AnMBRs for municipal WWTPs. Furthermore, the environmental and economic aspects of these applications were reviewed. Lastly, challenges and future perspectives related to the co-digestion applications by AnMBR were thoroughly discussed.