Yazarlar
- Tozlu, Alperen(15)
- Kul, Sinan(13)
- Kutlu, Naciye(12)
- Cuce, Erdem(8)
- Cuce, Pinar Mert(8)
- Uçurum, Metin(8)
- Gökçe, H.S.(7)
- Kamiloğlu, Aybike(7)
- Özahi, Emrah(6)
- Şahin, Engin(6)
- Ayata, Ümit(5)
- Ecem Bayram, Nesrin(5)
- Ekmekyapar Torun, Fatma(5)
- Guclu, Tamer(5)
- Gökçe, H. Süleyman(5)
- Serencam, Huseyin(5)
- Yilmaz, Fatih(5)
- Özdemir, Akın(5)
- Bayram, Sinan(4)
- Cengiz, Ibrahim(4)
- Elbir Abca, Tuğba(4)
- Gerçek, Yusuf Can(4)
- Gökçe, H. S.(4)
- Karbancioglu-Guler, Funda(4)
- Mercan, Emin(4)
- Serencam, Hüseyin(4)
- Sert, Durmuş(4)
- Teke, Çağatay(4)
- Torun, Fatma Ekmekyapar(4)
- Tozlu, A.(4)
- İrdemez, Şahset(4)
- Abusoglu, Aysegul(3)
- Abuşoğlu, Ayşegül(3)
- Baştürk, Fatma Nur(3)
- Bingül, Züleyha(3)
- Can, Zehra(3)
- Duran, Celal(3)
- Kamiloğlu, Hakan Alper(3)
- Karakaş, İbrahim Hakkı(3)
- Kırkıncı, Seran(3)
Yayınlar
- MakaleAçık Erişim2023Scopus SJRQ1The effect of waste material generated during paper production on the rheological and structural features of asphalt binder
Yilmaz, Bahadir; Ugurlu, Nuray
In this study, the performance properties of magnesium lignosulfonate, an organic waste material produced during paper production from wood, on asphalt binder were investigated. The modification was carried out by adding magnesium lignosulfonate (MLS) at 2%, 4%, 6%, and 8% by weight to the asphalt with B50/70 penetration grade. The morphological structure, modification mechanism, and thermal decomposition temperatures of the modified asphalt binders formed by adding the MLS to the asphalt were determined by a Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Thermogravimetry-Differential Thermal Analysis (TG/DTG), respectively. The physical and rheological properties of the material were determined by penetration, softening point, Rolling Thin Film Oven Test (RTFOT), Dynamic Shear Rheometer (DSR), and Rotational Viscometer (RV) experiments conducted in a laboratory. The experimental results showed that the organic-based waste additive increases the asphalt consistency, rutting, and short-term aging resistance, and decreases the temperature sensitivity.
AtıfScopus6WoS7OpenAlex7
İncele - Derleme MakaleAçık Erişim2023Scopus SJRQ1Recent Insights into the Use of Antagonistic Yeasts for Sustainable Biomanagement of Postharvest Pathogenic and Mycotoxigenic Fungi in Fruits with Their Prevention Strategies against Mycotoxins
Oztekin, Sebahat; Dikmetas, Dilara Nur; Devecioglu, Dilara; Acar, Emine Gizem; Karbancioglu-Guler, Funda
Fungi-induced postharvest diseases are the leading causes of food loss and waste. In this context, fruit decay can be directly attributed to phytopathogenic and/or mycotoxin-producing fungi. The U.N. Sustainable Development Goals aim to end hunger by 2030 by improving food security, sustainable agriculture, and food production systems. Antagonistic yeasts are one of the methods presented to achieve these goals. Unlike physical and chemical methods, harnessing antagonistic yeasts as a biological method controls the decay caused by fungi and adsorbs and/or degrades mycotoxins sustainably. Therefore, antagonistic yeasts and their antifungal mechanisms have gained importance. Additionally, mycotoxins’ biodetoxification is carried out due to the occurrence of mycotoxin-producing fungal species in fruits. Combinations with processes and agents have been investigated to increase antagonistic yeasts’ efficiency. Therefore, this review provides a comprehensive summary of studies on preventing phytopathogenic and mycotoxigenic fungi and their mycotoxins in fruits, as well as biocontrolling and biodetoxification mechanisms.
AtıfScopus75WoS62OpenAlex74
İncele - MakaleYalnız künye2023Scopus SJRQ1Biological control of green mould on mandarin fruit through the combined use of antagonistic yeasts
Öztekin, Sebahat; Karbancioglu-Guler, Funda
Penicillium digitatum is the primary cause of green mould in mandarins during the postharvest period, mainly controlled through synthetic fungicides. This study evaluated the biocontrol of green mould on mandarin fruit with three antagonistic yeasts (Hanseniaspora uvarum, Meyerozyma guilliermondii, and Metschnikowia aff. pulcherrima P01A016), alone or in combination, by elucidating their possible mechanisms of action. All yeast cultures alone (73.85 % − 80.64 %) and their combinations (78.40 % − 83.18 %) reduced the mycelial growth of green mold in vitro. M. aff. pulcherrima reduced the disease incidence and lesion diameters by 75.5 % and 91.3 %, respectively, demonstrating the highest biocontrolling activity alone. Meyerozyma guilliermondii showed the highest biofilm formation (OD 0.93 ± 0.01) and antifungal activity (71.13 %) through volatile organic compounds (VOCs), while H. uvarum displayed cell-wall degrading β-1,3 glucanase activity together with mycocinogenic and VOCs activity. All tested yeasts showed chitinase, protease, and leucine arylamidase activity. Among dual combinations, M. guilliermondii and M. aff. pulcherrima (M-1) were the most compatible, while M. aff. pulcherrima and H. uvarum (M-3) had the least compatibility. The combined application of these three yeasts resulted in synergistic co-operation, demonstrating the highest biocontrolling efficacy in vitro and in vivo. Integrating multiple mechanisms of action in yeasts could create a hurdle approach for inhibiting green mould in citrus as a green alternative to synthetic fungicides. Thus, our study demonstrated that combining biocontrol yeasts can result in beneficial consortia for the eco-friendly and sustainable management of P.digitatum-caused postharvest diseases of mandarins in both the wounded and intact mandarin fruits.
AtıfScopus42WoS39OpenAlex40İncele - MakaleAçık Erişim2022Kendiliğinden Yerleşen Hafif Betonda Mermer Tozu Kullanımının Araştırılması
Avan, Çağrı; Çaglar, Hakan; Çimen, Selçuk; Ahiskali, Adem; Özdemir, Celal
Bu çalışmada, doğal kaynaklarımızdan biri olan Nevşehir bölgesine ait asidik pomza agregası ile Kırşehir bölgesinden elde edilen endüstriyel atık olan atık mermer tozunun kullanılması sonucu kendiliğinden yerleşen hafif beton üretilmesi amaçlanmaktadır. çimento ikame malzemesi olarak farklı oranlarda (%0, %5, %10 ve %15). Çalışma sonucunda fiziksel ve mekanik olarak kendiliğinden yerleşen hafif betondan üstün bir yapı malzemesi elde edilmesi hedeflenmiştir. Bu kapsamda, kendiliğinden yerleşen hafif betonların taze ve sertleşmiş özellikleri araştırılmıştır. Taze beton özelliklerini belirlemek için; taze beton birim ağırlık, çökme-yayılma, V hunisi, L kutu ve U kutu testi ve taze beton birim hacim ağırlık testi yapılmıştır. Sertleşmiş beton özelliklerini belirlemek için su emme, kuru birim ağırlık testi, basınç dayanımı testi, yarmada çekme dayanımı testleri uygulanmıştır. Çalışma sonucunda; %15 mermer tozu kullanımının uygun olacağı kendiliğinden yerleşen hafif beton üretiminde kullanılmasında bir sakınca olmadığı belirlenmiştir. Mermer tozu gibi endüstriyel atıkların beton üretiminde kullanılması hem çevre kirliliği hem de sürdürülebilirlik açısından önemlidir.
AtıfOpenAlex2
İncele - MakaleAçık Erişim2022Elektrokoagülasyon yöntemi ile demir elektrotlar kullanılarak sulardan fosfat giderimi üzerine destek elektrolit türü ve konsantrasyonunun etkisi
Kul, Sinan; İrdemez, Şahset; Torun, Fatma Ekmekyapar; Reçber, Züleyha; Demircioğlu, Nuhi
Bu çalışmada elektrokoagülasyon prosesi kullanılarak atıksuyun iletkenliğini artırmak için suya verilen destek elektrolitin türü ve konsantrasyonunun sulardan fosfat giderimine etkisi araştırılmıştır. Ayrıca elektrolitsiz deneyler yapılmış ve sonuçlar karşılaştırılmıştır. Destek elektrolit tipi ve konsantrasyonunun fosfat giderme verimliliği, enerji tüketimi ve reaksiyon hızı üzerindeki etkisi analiz edilmiştir. Deneyler, elektrolit kullanımının fosfat giderme verimliliği üzerinde önemli bir etkisi olmadığını göstermiştir. Ancak elektrolit ilavesinin enerji tüketimini azalttığı ve uzaklaştırma oranını arttırdığı bulunmuştur. Elde edilen sonuçlardan en uygun elektrolit türü olarak NaCl ve optimum doz olarak 5 mM elektrolitin yeterli olduğu belirlenmiştir. Bu koşullar altında, 0.5 mA cm-2 akım yoğunluğunda 100 mg L^-1 PO_4-P için fosfat giderme verimi %96.98, enerji tüketimi 1.13 kWh m^-3 ve birinci dereceden reaksiyon hızı sabiti 0.0593 dk^-1 olarak elde edilmiştir.
AtıfOpenAlex2İncele - Derleme MakaleYalnız künye2022Alüminyum Alaşımlarının Dökümünde Yaygınca Kullanılan Sıvı Metal Temizleme Yöntemlerinin İncelenmesi
Yüksel, Çağlar; Colak, Murat; Koşatepe, Abdulhadi; Tokatlı, Mehmet; Saydam, Ferhat; Hal, Murat
Alüminyum ve alaşımlarının birçok avantajlı özelliği sayesinde metal dökümü endüstrisinde demir-çelikten sonra kendisine ikinci sırada yer bulmayı başarmıştır. Alüminyum üretimi cevherden ve hurdadan geri dönüşüm şeklinde temelde iki farklı prosesle elde edilmektedir. Alüminyumun en önemli hammaddesi boksittir ve birincil alüminyum bu cevherden elde edilir. Alüminyum üretiminde boksit cevherinden üretim, hurdadan geri dönüşüme nazaran çok daha fazla enerjiye ihtiyaç duymaktadır. Üretici girdisinde de ciddi ekonomik değere sahip olan ikincil alüminyum sanayide oldukça fazla kullanılmaktadır. Ancak geri dönüşüm yoluyla ikincil alüminyum kullanımında karşılaşılan en önemli problemler sıvı metal kalitesinin optimizasyonu ve ilave sıvı metal işlemlerinin gereksinimidir. Yüksek kaliteli alüminyum dökümler üretmek için, çözünmüş hidrojenin, çift katlı oksit filmlerinin (bifilm), katışkıların (inklüzyon) ve safsızlıkların (empürite) arındırılması gerekmektedir. Bu amaçla endüstride birçok sıvı metal temizleme yöntemi kullanılmakta ve her geçen gün alternatif yeni yöntemler geliştirme çalışmaları devam etmektedir. Bu derlemede de bu perspektiften bakılarak, alüminyum ve alaşımlarının dökümünde güncel olarak yaygınca kullanım bulan sıvı metal temizleme yöntemlerinden; flaks kullanımı, rotary (döner tip) gaz giderme, kontrollü katılaştırma yöntemi, elektromanyetik yönlü gaz giderme, sprey gaz giderme, ultrasonik gaz giderme yöntemi, vakumlu gaz giderme yöntemleri ele alınmıştır.
AtıfOpenAlex5TR Dizin3İncele - MakaleAçık Erişim2022Sürdürülebilir Restoran İşletmeciliği Uygulamaları Üzerine Bir İçerik Analizi
Gürbüz, Ahmet; Apak, Ömer Ceyhun
İşletmeler doğal çevrenin korunması ve tahribatın önlenmesi için önemli roller üstlenmektedir. Çevre sorunlarına karşı gösterilen çabalar kapsamında yiyecek içecek sektöründe kıt kaynakların tüketimini önlemek için çeşitli girişimler gerçekleştirilmektedir. Bu kapsamda küçük ve orta büyüklükte işletmeler olarak görülen restoranlar sürdürülebilirlik uygulamalarını benimsemiştir. Çevre bilincinin artmasından dolayı sürdürülebilir restoran veya yeşil restoran temalı işletmeler faaliyete geçmiştir. Bu araştırmada uluslararası yazın alanı taranarak sürdürülebilir restoranlar ile ilgili çalışmalar içerik analizi kapsamında incelenmiştir. Ulaşılan çalışmaların tanımlayıcı bilgileri ve çalışmalarda öngörülen tespitlerin benzer veya farklı yönleri yorumlanmıştır. Araştırma sonuçlarına göre sürdürülebilir restoranlar ve uygulamalarına yönelik çalışmalar ekonomik, sosyal ve çevresel olmak üzere üç kategoride değerlendirilmiştir. Buna göre, çalışmaların en fazla çevresel temalı olduğu tespit edilmiştir. Çalışmalarda öne çıkan unsurlar; enerji ve su tasarrufu, atık yönetiminin iyi yapılması, tek kullanımlık ürün ve geri dönüştürülebilir atık yönetiminin uygulanması gerekliliği, işletmelerin sürdürülebilir menü sunabilme yeteneğinin olması, ekonomik açıdan verimlilik elde etmek için güneş panellerinin ve rüzgâr türbinlerinin hayata geçirilmesi gerekliliği şeklindedir.
AtıfOpenAlex9TR Dizin5İncele - MakaleAçık Erişim2022Investigation of green consumers 'subjective well being within the scope of purchase behavior, attitudes and personality traits
Erciş, Aysel; Yildiz, Tugba
Environmental problems that increase with global developments require individuals to behave more envi- ronmentally. The determination of this requirement depends on increasing the awareness of individuals and motivating green consumer behaviors. At this point, one of the most important factors is the happiness and satisfaction levels of people's lives, known as subjective well-being. The increase in the subjective well-being of individuals creates a win-win relationship between the environment and the consumer, and presents the gains of being a green consumer back to the consumer as life satisfaction. In this study, personality traits were first examined in order to define green consumers correctly. Later, the effect of personality traits on the environment and helping attitudes was revealed, and finally, the effect of green purchasing behavior on sub- jective well-being, which is an important indicator of social welfare, was investigated. The results revealed that personality traits affect green consumers' attitudes towards both the environment and helping, and these attitudes have an effect on green purchasing behavior. In addition, it was determined that green purchasing behavior was effective on the output variable of the model, subjective well-being.
AtıfOpenAlex5TR Dizin2İncele - MakaleAçık Erişim2022Analysis of the Validity of the Environmental Kuznets Curve Hypothesis for Turkey
Yıldız, Şaduman
Environmental wastes increasing with the industrialization process have caused environmental problems to come into prominence worldwide. Therefore, the relationship between economic growth and environmental pollution has become the center of attention for many researchers, and many studies have been conducted. One of the most important hypotheses that reveal the relationship between these variables is the Environmental Kuznets Curve (EKC). In this context, the study aimed to examine the validity of the EKC, which revealed an inverse-U-shaped relationship between economic growth and environmental pollution, for Turkey in the period between 1990 and 2015. The relationship between environmental pollution and economic growth in the study was analyzed through the ARDL limit test. According to the analysis results, it was concluded that the EKC hypothesis was valid for Turkey in the period mentioned. In this respect, environmental degradation initially rises as economic growth increases, but environmental pollution decreases with the increase in environmental consciousness after a certain threshold growth level. Moreover, the study elucidated that the increase in the amount of renewable energy consumption reduced environmental pollution. Accordingly, it is recommended to produce with clean technology that will enhance the environmental quality in the production process and implement a stable growth policy that will increase the amount of renewable energy consumption within the total energy consumption. Furthermore, legal regulations can be made to promote the use of environmentally friendly technologies in production, and tax reductions or various investment supports can be provided within this framework.
AtıfOpenAlex1İncele - MakaleAçık Erişim2022Farklı substratlar, Pleurotus ostreatus'un antioksidan özelliklerini ve antimikrobiyal aktivitesini etkiler mi?
Karaoğlu, Şengül Alpay; Peksen, Aysun; Can, Zehra; Bozdeveci, Arif; Avcı, Sibel
Öz: Bu çalışmanın amacı, yetiştirme ortamının Pleurotus ostreatus (Jacq. ex Fr.) P. Kumm.'un antioksidan özellikleri ve antimikrobiyal aktiviteleri üzerindeki etkisini belirlemektir. Çalışmada beş adet talaş (%80) ve atık (%20 Çay Atığı veya Buğday Kepeği) ile farklı oranlarda (%80 Talaş + %20 TW, %80 Talaş + 20% GW) yetiştirme substratları hazırlanmıştır. Toplam 19 farklı ortamda yetiştirilen P. ostreatus'tan elde edilen metanol ekstraktların, mikroorganizmalara karşı antimikrobiyal aktiviteleri agar kuyu difüzyon tekniği ile test edildi. Toplam fenolik içerik, Folin-Ciocalteau prosedürü kullanılarak ölçülmüştür. Antioksidan kapasitesi, DPPH'nin ferrik indirgeyici antioksidan gücü (FRAP) ve serbest radikal süpürücü aktivitesi kullanılarak belirlendi.. 80QS+20TW substratından elde edilen mantarların metanol ekstraktının bu çalışmada incelenen tüm mikrooganizmalara karşı en etkili ekstrakt olduğu belirlendi. Farklı substratlar üzerinde yetiştirilen mantar ekstraktlarının antioksidan içerikleri arasında önemli farklılıklar (P
AtıfOpenAlex1İncele - MakaleAçık Erişim2022Scopus SJRQ3DETERMINATION OF PARAMETERS AFFECTING KINETIC AND THERMODYNAMIC VALUES FOR LEAD REMOVAL USING WASTEWATER TREATMENT PLANT SEWAGE SLUDGE ASH
Irdemez, Sahset; Yesilyurt, Duygu; Torun, Fatma Ekmekyapar; Kul, Sinan
In this study, treatment of lead containing wastewater using sewage sludge ash obtained from the incineration unit in the domestic wastewater treatment plant in Gaziantep province in Turkey was investigated. The main purpose of the study is to determine the potential of using the treatment sludge ash, which comes out as waste in the treatment plant, in the treatment of wastewater of another industry. As a result of this study, the most suitable adsorption conditions were determined and focused on the kinetics of adsorption. In the experiments, the lead adsorption capacity of sewage sludge ash was determined as 122 mg g-1 at 0.5 g L-1 adsorbent concentration in wastewater containing 100 mg L-1 Pb2+under optimum conditions. As a result of the research, it was determined that the adsorption reaction proceeds according to the pseudo second degree reaction and is suitable for the Langmuir isotherm. As thermodynamic constants, & UDelta;H & DEG; = 7.407 kJ mol-1 and & UDelta;S & DEG; = 33.25 J mol-1 were determined. As a result of this, it was determined that the adsorption reaction was endothermic, spontaneous and random, and adsorption was physical adsorption. The results show that sewage sludge ash can be used in the treatment of water containing high concentrations of Pb2+.
AtıfWoS3OpenAlex4İncele - MakaleAçık Erişim2022Scopus SJRQ2Efficient bioreduction of cyclohexyl phenyl ketone by Leuconostoc pseudomesenteroides N13 biocatalyst using a distance-based design-focused optimization model
Özdemir, Akın; Şahin, Engin
Whole-cell biocatalysts have been a popular method for the preparation of chiral alcohols. Although asymmetric reduction of cyclohexyl(phenyl)methanone (1) by chemical catalysts is common, a biocatalytic asymmetric reduction is extremely rare. In this respect, we report herein that Leuconostoc pseudomesenteroides N13 was successfully employed as a biocatalyst to reduce 1 to (S)-cyclohexyl(phenyl)methanol ((S)-2). Furthermore, the use of a mathematical optimization strategy for asymmetric reduction of substrate 1 is not known in the current literature. The new distance-based design-focused optimization model was used to enhance the conversion of the substrate, enantiomeric excess (ee) of product, and yield. The distance-based design-focused optimization model identified the following optimal bioreduction conditions: pH=6.46, temperature=30°C, incubation period=72 hours, and agitation speed=199 rpm. Then it was stated that under these ideal conditions, (S)-2 may be produced with 99 % ee and 98.46 % conversion rate (cr). (S)-2 was achieved with 99% ee, and 99% cr as a consequence of the experimental reaction carried out under the indicated optimization conditions. It has been shown that Leuconostoc pseudomesenteroides N13 can be utilized as a biocatalyst in asymmetric reduction reactions. This study, in addition to being the first example of a bioreduction of substrate 1 by mathematical optimization, also demonstrates for the first time the distance-based design-focused model can be used in the bioreduction reaction.
AtıfScopus9WoS9OpenAlex8İncele - MakaleAçık Erişim2022Scopus SJRQ2The Investigation of COD Treatment and Energy Consumption of Urban Wastewater by a Continuous Electrocoagulation System
Dede Sağsöz, Yeşim; Yilmaz, Alper Erdem; Ekmekyapar Torun, Fatma; Kocadağistan, Beyhan; Kul, Sinan
In this study, electrochemical treatment of urban wastewater with electrical conductivity of 1000 µS cm-1 and chemical oxygen demand of 250 mg L-1 was investigated using the variables of initial pH value, current density and flow rate. Electrocoagulation was used, in which aluminum and stainless steel were selected, as the electrochemical treatment process. The electrocoagulation process was operated in continuous mode. The data obtained in experimental studies show that the best COD removal efficiency occurred in experiments where the initial pH value was 6. The increase in current density from 5 A to 15 A decreased the removal efficiency from 79 to 67%. The increase in flow rate under constant current density also reduced the efficiency of removal as expected. In experiments in which current density and flow rate were examined together, the increase in flow rate allowed the application of higher current densities. This situation led to considerable reductions in energy consumption values, even if the COD removal efficiency did not significantly increase. The high COD removal obtained with the use of high flow rate and high current density indicates that the electrocoagulation process can be used for high flow rate municipal wastewater treatment.
AtıfScopus6WoS5OpenAlex5İncele - MakaleAçık Erişim2022Scopus SJRQ3A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy
Abusoglu, A.; Tozlu, A.; Anvari-Moghaddam, A.
This paper presents the design, evaluation, and optimization of an electricity generation system based on the two-stage organic Rankine cycle (TS-ORC), which utilizes the waste heat of an existing fluidized bed sewage sludge incineration (FBSSI) facility. The facility incinerates an average of 300 tons per day of sewage sludge with a dry matter content of 22%. After the drying process, the sewage sludge is burned in a fluidized bed combustor, and exhaust gas at a temperature of about 850-900ºC is released due to the combustion. The system provides the energy required to dry the sludge from this exhaust gas. In this study, a TS-ORC is designed to be coupled to the exhaust gas flowlines discharged to the atmosphere at two different points in the FBSSI plant. The exergy efficiency of the FBSSI facility is found to be 70.5%. Three different working fluids are selected to examine the variations of thermodynamic and thermoeconomic performance parameters of the designed TS-ORC system. The highest power generation in the TS-ORC system (183.40 kW) is achieved using R1234yf as working fluid. R1234yf is also the most expensive fluid for electricity generation among the other working fluids (10.57 $/h). The least electricity generation in the TS-ORC (142.70 kW) occurs at the thermoeconomically most affordable cost with R245fa (9.35 $/h).
AtıfScopus2WoS2OpenAlex2İncele - MakaleAçık Erişim2022Scopus SJRQ2Investigation of the biological treatability of pistachio processing industry wastewaters in a batch-operated aerobic bioreactor
Tırınk, Sevtap; Nuhoğlu, Alper; Kul, Sinan
This study encompasses investigation of treatment of pistachio processing industry wastewaters in a batch reactor under aerobic conditions, calculation of kinetic parameters and comparison of different inhibition models. The mixed microorganism culture used in the study was adapted to pistachio processing industry wastewaters for nearly one month and then concentrations from 50 to 1000 mg L−1 of pistachio processing industry wastewaters were added to the medium and treatment was investigated in batch experiments. The Andrews, Han-Levenspiel, Luong and Aiba biokinetic equations were chosen for the correlations between the concentration of pistachio processing industry wastewaters and specific growth rates, and the kinetic parameters in these biokinetic equations were calculated. The maximum specific growh rate, semi-saturated constant and inhibition constant parameters, included in the Aiba biokinetic equation providing best fit among the other equations, had values calculated as 0.25 h−1, 19 mg L−1, and 516 mg L−1, respectively. The substrate value reaches maximum value and the specific growth rate at this concentration were calculated as 101.379 mg L−1 and 0.1827 h−1, respectively. Graphical abstract: [Figure not available: see fulltext.]
AtıfScopus4WoS4OpenAlex5İncele - MakaleAçık Erişim2022Scopus SJRQ1Techno-economic assessment of a synthetic fuel production facility by hydrogenation of CO2 captured from biogas
Tozlu, Alperen
In this study, a thermodynamic and economic analysis of a synthetic fuel production facility by utilizing the hydrogenation of CO2 captured from biogas is carried out. It is aimed to produce methanol, a synthetic fuel by hydrogenation of carbon dioxide. A PEM electrolyzer driven by grid-tie solar PV modules is used to supply the hydrogen need of methanol. The CO2 is captured from biogas produced in an actual wastewater treatment plant by a water washing unit which is a method of biogas purification. The required power which is generated by PV panels, in order to produce methanol, is found to be 2923 kW. Herein, the electricity consumption of 2875 kW, which is the main part of the total electricity generation, belongs to the PEM system. As a result of the study, the daily methanol production is found to be as 1674 kg. The electricity, hydrogen and methanol production costs are found to be $ 0.043 kWh−1, $ 3.156 kg−1, and $ 0.693 kg−1, respectively. Solar availability, methanol yield from the reactor, and PEM overpotentials are significant factors effecting the product cost. The results of the study presents feasible methanol production costs with reasonable investment requirements. Moreover, the efficiency of the cogeneration plant could be increased via enriching the biogas while emissions are reduced.
AtıfScopus34WoS32OpenAlex37İncele - MakaleYalnız künye2022Scopus SJRQ2Photocatalytic activity of cobalt aluminate nanoparticles synthesized by microwave-assisted combustion method
Karakaş, İbrahim Hakkı; Karcıoğlu Karakaş, Zeynep; Ertuğrul, Mehmet
Cobalt aluminate is one of the most widely-used spinel aluminate types. It is known that various structural, magnetic and morphological properties of spinel ceramics can vary depending on the synthesis technique and the starting chemicals used. In this study, initially, heat treatment was applied to cobalt aluminate nanoparticles synthesized by the microwave-assisted combustion method and the effects of the applied heat treatment on the structural properties were investigated. Characterization studies showed that cobalt aluminate spinel pigments were successfully synthesized. The optimum heat treatment temperature was determined as 700 °C. Then, the synthesized cobalt aluminate nanoparticles were used as photocatalysts for dye removal by photocatalytic oxidation from a synthetic wastewater containing Astrazon red textile dye and their photocatalytic activity was investigated at different catalyst dosages. Moreover, the same particles were also produced by conventional combustion technique. Then, their photocatalytic activities were studied and the data were compared with the results obtained from the experiments made with the samples produced with microwave assisted combustion method under the same experimental conditions. The results show that cobalt aluminate nanoparticles synthesized by microwave assisted combustion exhibit a better photocatalytic activity. In experiments performed with samples produced via microwave-assisted combustion method, all dyestuff content in the solution containing 50 mg/L dye was completely removed under UV irradiation for approximately 60 min. It was determined that the catalyst dosage had an effect on the reaction rate and the reaction was found to be compatible with the pseudo first order kinetic model.
AtıfScopus12WoS12OpenAlex13İncele - MakaleAçık Erişim2022Scopus SJRQ3Investigation of the recovery efficiency of CeUF method through RT-qPCR quantification of inactivated SARS-CoV-2 in untreated wastewater
Sait, Ahmet; Korkmaz, Serol; Parmaksiz, Ayse; Bayraktar, Bulent
Wastewater-based disease monitoring is an early warning system and a surveillance tool for infectious disease outbreaks regarding pathogens with pandemic potential. This study aimed at investigating the recovery efficiency of centrifugal ultrafiltration (CeUF), which is one of the most-used virus concentration methods, for inactive severe acute respiratory syndrome coronavi-rus 2 (SARS-CoV-2) added to wastewater. Inactivated SARS-CoV-2 was inoculated into untreated wastewater at different concentrations (4 × 103, 8 × 103, 16 × 103, 24 × 103 and 32 × 103 gene copy/ µL) and concentrated through ultrafiltration with a disposable centrifugal filter device. Total nucleic acids in concentrated filtrates were extracted and isolated by an automated system. In isolates, total RNA was measured by a UV/VIS spectrophotometer, and the recovered virus was quanti-fied by RT-qPCR with two gene regions (N1 and N2). The recovery rates were between 11% and 17.8% (mean 15.1%, CV below 15%). While there were positive correlations among the inoculated virus, total RNA and recovered virus, there was no correlation and linearity between the recovery rates. Despite limited recovery rates, CeUF integrated with RT-qPCR quantification can be a valid assay for monitoring SARS-CoV-2 in wastewater, and an early warning system.
AtıfScopus2WoS2OpenAlex3İncele - MakaleAçık Erişim2022Scopus SJRQ1Improvement of mechanical and transport properties of reactive powder concrete using graphene nanoplatelet and waste glass aggregate
Arslan, S.; Öksüzer, N.; Gökçe, H.S.
In this study, the use of graphene nanoplatelet (GNP) and waste glass aggregate (WGA) was investigated to improve the mechanical and transport properties of reactive powder concrete (RPC), which is an ultra-high strength concrete type. The co-addition of 0.14% GNP and 30% WGA resulted in a significant increase in the compressive strength of RPC from 192.9 to 258.9 MPa and flexural strength from 16.2 to 38.7 MPa. In the study, the most significant improvement (138.6%) was obtained for the flexural strength values of RPC. Considering the strength aspects, the relevant amounts of GNP and WGA enable production of RPC ensuring a conducted electrical charge of less than 100 Coulombs; that is, with negligible chloride ion permeability. Accordingly, the highest improvement (59.8%) after flexural strength was found for the resistance of the specimens against chloride ion penetrability. In conclusion, the findings of this study show that eco-efficient production of RPC with superior mechanical and durability characteristics can be achieved using GNP and WGA, with lower cement consumption per unit value of these studied characteristics, reaching 59%.
AtıfScopus31WoS26OpenAlex32İncele - MakaleYalnız künye2022Scopus SJRQ2Investigation of the Treatment of Olive Mill Wastewater by Electrooxidation
Kul, Sinan; Boncukcuoğlu, Recep; Ekmekyapar Torun, Fatma; Reçber, Züleyha; Sözüdoğru, Onur; Aladağ, Erdinç
The electrooxidation process, one of the advanced oxidation processes, is one of the effective treatment processes used in treating various industrial wastewaters. This study investigated the treatment of olive mill wastewater using the electrooxidation process. This study includes the effects of different experimental parameters on chemical oxygen demand and total phenol removal efficiencies in olive mill wastewater. Ti/IrO2/RuO2 mesh plates as anode material and Ti mesh plates as cathode material were used in the study. The effects of stirring rate, dilution factor, pH, type of support electrolyte, the concentration of support electrolyte, and current density on chemical oxygen demand and total phenol removal efficiencies were examined in the experiments using a batch reactor. The study found that the chemical oxygen demand and total phenol removal rates were 96.93% and 100% under optimum conditions, respectively. According to the treatment data obtained, it can be said that olive mill wastewater can be treated by the electrooxidation method and can be proposed as a pretreatment system before entering biological treatment.
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