Uzal, Niğmet
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Uzal, N.
Uzal, Nigmet
Uzal, Niğmet
Uzal, Niǧmet
Uzal, Nıgmet
Uzal, Nigmet
Uzal, Niğmet
Uzal, Niǧmet
Uzal, Nıgmet
Job Title
Prof. Dr.
Email Address
nigmet.uzal@agu.edu.tr
Main Affiliation
02.03. İnşaat Mühendisliği
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
13
CLIMATE ACTION
12
Research Products
15
LIFE ON LAND
5
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
9
Research Products
10
REDUCED INEQUALITIES
1
Research Products
2
ZERO HUNGER
2
Research Products
6
CLEAN WATER AND SANITATION
20
Research Products
14
LIFE BELOW WATER
8
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
19
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
1
Research Products
5
GENDER EQUALITY
1
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
21
Research Products
7
AFFORDABLE AND CLEAN ENERGY
6
Research Products
4
QUALITY EDUCATION
1
Research Products
1
NO POVERTY
1
Research Products
17
PARTNERSHIPS FOR THE GOALS
5
Research Products
3
GOOD HEALTH AND WELL-BEING
1
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
22
Research Products
Documents
49
Citations
1482
h-index
20
Documents
43
Citations
1176
Scholarly Output
56
Articles
45
Views / Downloads
0/0
Supervised MSc Theses
4
Supervised PhD Theses
1
WoS Citation Count
979
Scopus Citation Count
1051
WoS h-index
16
Scopus h-index
16
Patents
0
Projects
8
WoS Citations per Publication
17.48
Scopus Citations per Publication
18.77
Open Access Source
24
Supervised Theses
5
| Journal | Count |
|---|---|
| Desalination and Water Treatment | 5 |
| Environmental Science and Pollution Research | 4 |
| Journal of Cleaner Production | 3 |
| Erciyes Üniversitesi Fen Bilimleri Enstitüsü Dergisi | 3 |
| Separation and Purification Technology | 2 |
Current Page: 1 / 7
Scopus Quartile Distribution
Competency Cloud
56 results
Scholarly Output Search Results
Now showing 1 - 10 of 56
Article Comparative Life Cycle Assessment of the Environmental Impacts of Precast Concrete and Brick Walls(2022) Uzal, Nıgmet; Gülçımen, SedatSon yıllarda, yapı malzemelerinin ve bileşenlerinin çevresel etkilerinin değerlendirilmesine artan bir ilgi vardır. Bu çevresel etkiler göz önünde bulundurularak, kullanıcı ihtiyaçlarının karşılanması ve çevresel etkilerin en aza indirilmesi için uygun yapı malzemelerinin ve teknolojisinin seçimi çok önemlidir. Bu çalışmanın amacı, Yaşam Döngüsü Değerlendirmesi (YDD) metodolojisini kullanarak beşikten kapıya yaklaşımıyla prekast beton duvar ve tuğla duvar üretiminin çevresel etkilerini karşılaştırmaktır. Bu çalışmada, ISO 14040 ve 14044 standardlarına göre SimaPro 9.2 yazılımı kullanılarak YDD uygulanmıştır. Yaşam döngüsü etki değerlendirmesi için CML-IA baseline yöntemi ve Ecoinvent veri tabanı kullanılmıştır. Elde edilen sonuçlar, abiyotik tükenme ve deniz suyu ekotoksisitesi hariç tüm etki kategorilerinde tuğla duvarın prekast beton duvardan daha iyi çevresel performansa sahip olduğunu ortaya koymuştur. Prekast beton ve tuğla duvarın m2 başına küresel ısınma potansiyeli sırasıyla 2.35E+02 kg CO2 eq. ve 2.10E+02 kg CO2 eq. olarak hesaplanmıştır.Article Citation - WoS: 17Citation - Scopus: 24Clarification of Apple Juice Using New Generation Nanocomposite Membranes Fabricated With TiO2 and Al2O3 Nanoparticles(Springer, 2020) Severcan, Solmaz Sebnem; Uzal, Nigmet; Kahraman, KevserTo enhance anti-fouling properties of polymeric membranes during apple juice clarification, PSF/PEI (20/2 wt%) ultrafiltration (UF) membranes were modified with TiO2 and Al2O3 nanoparticles using the phase inversion method. Turbid apple juice samples were clarified using cross-flow membrane filtration system. All fabricated nanocomposite UF membranes had higher apple juice flux values than PSF/PEI membrane. Membrane prepared with 0.01% TiO2 (UFT1) had the highest apple juice flux (at steady state, 44.6 L/m(2)h). The FRR (%) value of TiO2 and Al2O3 incorporated UF membranes was between 90.9-94.0% and 79.6-97.6%, respectively, and these FRR values were higher than that of PSF/PEI membrane (UF2, 60.3%). Porosity and hydrophilicity of the UF membranes significantly increased with the addition of nanoparticles and the highest porosity and hydrophilicity was achieved in the 0.01% TiO2 incorporated UF membrane (UFT1) membrane. Higher flux recovery ratio (FRR) and lower relative flux reduction (RFR) values of Al2O3 and TiO2 incorporated nanocomposite membranes, compared with the unmodified membrane, demonstrated the enhancement in the anti-fouling properties of the PSF/PEI membrane. SEM images of the nanocomposite membranes also proved the nanoparticle incorporation to the PSF/PEI matrix. Color, turbidity, total soluble solid, total phenolic content, and antioxidant capacity of the samples using nanocomposite membranes were better than that of clarified using both commercial and unmodified membranes. TiO2 incorporated nanocomposite membranes had superior performance than Al2O3 incorporated nanocomposite membranes and among these membranes, the ones prepared with the addition of 0.01 wt% TiO2 exhibit the best performance in terms of clarification of apple juice.Research Project İnce Film Kompozit Membranlar ile Basınç Geciktirmeli Ozmos (PRO) Prosesi Kullanılarak Sürdürülebilir Enerji Üretimi(TUBİTAK, 2018) Uzal, NigmetFosil yakıtlara bağımlılığın azalması için alternatif yenilenebilir ve temiz enerji kaynaklarının_x000D_ bulunmasına yönelik araştırmalar gün geçtikçe artmakta ve önem kazanmaktadır. Son_x000D_ yıllarda oldukça ilgi çeken “tuzluluk gradyanı esaslı ozmotik enerji” veya “mavi enerji” olarak_x000D_ da bilinen enerji kaynağı, artan enerji ihtiyacını karşılamada farklı bir yenilenebilir kaynak_x000D_ olarak ortaya çıkmıştır. Ülkemizdeki tuzluluk gradyanı esaslı enerji potansiyelinin_x000D_ değerlendirilmesine yönelik ilk çalışma niteliğine olan bu projede öncelikle Devlet Su_x000D_ İşlerinden (DSİ) elde edilen nehir debi ve tuzluluk değerleri esas alınarak teorik enerji_x000D_ potansiyeli hesaplamaları gerçekleştirilmiştir. Teorik hesaplamalar tamamlandıktan sonra,_x000D_ enerji potansiyelinin deneysel olarak belirlenmesi için sentetik ve gerçek su örnekleri_x000D_ kullanılarak basınç geciktirmeli ozmos (PRO) prosesinde deneysel çalışmalar_x000D_ gerçekleştirilmiştir. Bu amaçla dört farklı (BW30-LE, SW30-HR, AG, AC) ticari ince film_x000D_ kompozit (TFC) ters osmos membran 3-(3,4-Dihydroxyphenyl)-L-alanine (L-DOPA) ve LDOPA ile birlikte nanomalzemeler (MWCNT, TiO2, SiO2, Al2O3) kullanılarak modifiye edilmiş_x000D_ ve PRO sisteminde işletilerek enerji üretim performansı lab-ölçekli deneyler ile belirlenmiştir._x000D_ TFC yapıdaki RO membranların modifikasyonu sonrası aktif yüzeylerinde meydana gelen_x000D_ yapısal değişiklerin belirlenmesinde SEM, FTIR, temas açısı, ve AFM analizleri_x000D_ gerçekleştirilmiştir. Deney sonuçları ışığında L-DOPA ile birlikte %1wt TiO2 nanomalzeme ile_x000D_ modifiye edilmiş BW30-LEmembranı 1,61 W/ m2 en yüksek PRO güç üretim potansiyelini_x000D_ göstermiştir. Gerçek su örnekleri ile gerçekleştirilen PRO deneylerinde Akdeniz, Karadeniz,_x000D_ Marmara ve Ege Denizlerinden deniz suyu ve bu denizlere dökülen Seyhan, Ceyhan, Büyük_x000D_ Menderes, Gediz, Susurluk, Kızılırmak ve Yeşilırmak nehirlerinin karıştığı noktalardan_x000D_ örnekler alınarak ülkemizde tuzluluk gradyanı esaslı bu enerjiye ilişkin potansiyel_x000D_ belirlenmiştir. Geçek su numunelerinde en yüksek enerji üretim performansı 56,8 mS/cm_x000D_ iletkenliğe sahip Akdeniz ile 586 µS/cm iletkenliğe sahip Ceyhan ve Seyhan nehrinin PRO_x000D_ prosesi uygulamasından 5 ve 10 barda sırasıyla 0,47 ve 0,68 W/m2 olarak bulunmuştur.Article Citation - WoS: 27Citation - Scopus: 31Life Cycle Sustainability Assessment of a Light Rail Transit System: Integration of Environmental, Economic, and Social Impacts(Wiley, 2021) Gulcimen, Sedat; Aydogan, Emel K.; Uzal, NigmetThe transition toward sustainable urban transportation has gained importance in recent decades. However, urban transportation has not been addressed for all dimensions of sustainability. This study presents a life cycle sustainability assessment of a light rail transit system in Kayseri, Turkey, by integrating environmental, economic, and social aspects. The sustainability performance of the light rail transit system is evaluated using a cradle-to-grave approach to assess three aspects of sustainability. For the environmental evaluation, a life cycle assessment was applied using SimaPro 8.4.1 PhD version based on ISO 14040 and 14044. The method, which includes nine environmental impact categories, was employed to assess the environmental performance of the light rail transit system with a functional unit of 1 passenger-km. For the economic assessment, life cycle costing was utilized with the functional unit of USD for 1 passenger-km. A social life cycle assessment was applied to assess the social performance of the light rail transit system based on guidelines published by the United Nations Environment Programme in collaboration with the Society of Environmental Toxicology and Chemistry. For the determination of social impacts, 11 subcategories and 18 social indicators were selected. The results showed that the global warming potential and abiotic depletion potential of the light rail system per passenger-km were 2.4E - 02 kg CO2 eq. and 2.7E - 01 MJ, respectively, with a service life of 50 years. The total life cycle cost of the light rail system was calculated as 0.046 USD for 1 passenger-km. The results also revealed that the main contributor to the total life cycle cost was energy cost, with 92% (2.88E + 08 USD) of the total cost. In the social performance evaluation, it is found that the industry performs well for society, the local community, and workers but has a weaker social performance for the consumer due to a weak feedback mechanism. Integr Environ Assess Manag 2021;00:1-13. (c) 2021 SETACArticle Citation - WoS: 54Citation - Scopus: 72Removal of Heavy Metals from Aluminum Anodic Oxidation Wastewaters by Membrane Filtration(Springer Heidelberg, 2018) Ates, Nuray; Uzal, NigmetAluminum manufacturing has been reported as one of the largest industries and wastewater produced from the aluminum industry may cause significant environmental problems due to variable pH, high heavy metal concentration, conductivity, and organic load. The management of this wastewater with a high pollution load is of great importance for practitioners in the aluminum sector. There are hardly any studies available on membrane treatment of wastewater originated from anodic oxidation. The aim of this study is to evaluate the best treatment and reuse alternative for aluminum industry wastewater using membrane filtration. Additionally, the performance of chemical precipitation, which is the existing treatment used in the aluminum facility, was also compared with membrane filtration. Wastewater originated from anodic oxidation coating process of an aluminum profile manufacturing facility in Kayseri (Turkey) was used in the experiments. The characterization of raw wastewater was in very low pH (e.g., 3) with high aluminum concentration and conductivity values. Membrane experiments were carried out with ultrafiltration (PTUF), nanofiltration (NF270), and reverse osmosis (SW30) membranes with MWCO 5000, 200-400, and 100 Da, respectively. For the chemical precipitation experiments, FeCl3 and FeSO4 chemicals presented lower removal performances for aluminum and chromium, which were below 35% at ambient wastewater pH 3. The membrane filtration experimental results show that, both NF and RO membranes tested could effectively remove aluminum, total chromium and nickel (> 90%) from the aluminum production wastewater. The RO (SW30) membrane showed a slightly higher performance at 20 bar operating pressure in terms of conductivity removal values (90%) than the NF 270 membrane (87%). Although similar removal performances were observed for heavy metals and conductivity by NF270 and SW30, significantly higher fluxes were obtained in NF270 membrane filtration at any pressure that there were more than three times the flux values in SW30 membrane filtration. Due to the lower heavy metal (< 65%) and conductivity (< 30%) removal performances of UF membrane, it could be evaluated as pretreatment followed by NF filtration to protect and extend NF membrane life. The water treated by both NF and RO could be recycled back into the process to be reused with economic and environmental benefits.Master Thesis Doğal Taş Endüstrisinde Eko-Verimliliği Artırmak için Kapsamlı Yaşam Döngüsü Değerlendirmesi(2024) Yıldız, Engin; Uzal, Niğmet; Dilek, Filiz BengüDoğal taş, madencilik ve inşaat sektörlerinin kesişim noktasında yer alarak hem ekonomik büyümede hem de çevresel sürdürülebilirlikte önemli bir role sahiptir. Dayanıklılığı, düşük bakım gereksinimi ve daha çevreci bir ürün olma potansiyeli ile değerlendirilen doğal taş, çevre dostu yapı uygulamalarının temel unsurlarından biri olmaya devam etmektedir. Ancak, doğal taş sektörünün kaynak yoğun doğası, önemli çevresel sorumluluklar getirmektedir. Dünyanın önde gelen doğal taş ihracatçılarından biri olan Türkiye, bu sektörden önemli ekonomik faydalar sağlamakta olup, çevresel etkilerin ele alınması ile küresel piyasada rekabet gücünün korunması kritik bir öneme sahiptir. Bu çalışma, doğal taş ürünlerinin yaşam döngüsü boyunca çevresel etkilerini değerlendirmek için Yaşam Döngüsü Değerlendirmesi (LCA) yöntemini kullanmakta, çevresel etki yoğun noktalarını belirlemekte ve çevresel performansı iyileştirme senaryolarını test etmektedir. Çalışmada, CML-IA Baseline metodu kullanılarak küresel ısınma potansiyeli, kaynak tükenmesi ve ekotoksisite gibi temel çevresel etkiler nicel olarak değerlendirilmiştir. Normalizasyon sonuçlarına göre, deniz suyu ekotoksisitesi doğal taş ürünlerinin yaşam döngüsü boyunca en çok etkilenen kategori olarak belirlenmiştir. Kesme, yüzey işleme ve kullanım aşamaları en çevresel etki yoğum yaşam döngüsü aşamaları olarak öne çıkmaktadır. Senaryo analizleri, çevresel performansta %60'a varan iyileştirmelerin mümkün olduğunu göstermekte ve doğal taş sektörünün küresel standartlara uyum sağlaması için sürdürülebilir üretim stratejilerinin kritik önemini vurgulamaktadır.Article Citation - WoS: 17Citation - Scopus: 14A Holistic Sustainability Assessment of a University Campus Using Life Cycle Approach(Springer, 2023) Gulcimen, S.; Qadri, S.; Donmez, R. O.; Uzal, N.The sustainability performances of campuses are of importance as it could model the effective sustainable initiatives that could be then applied to campuses by decision-makers and designers. Studies have been conducted on the environmental and economic assessment of campuses in specification with the identification of their carbon footprint and cost analysis, respectively. The studies have lacked a showcase of an ideal sustainable campus along with its urban and architectural features, facilities, and services through analyzing their social aspects as well. The objective of this study was to evaluate the sustainability of the Abdullah Gul University Sumer Campus to model a sustainable campus integrating the Environmental Life Cycle Assessment(E-LCA), the Life Cycle Costing (LCC) and the Social Life Cycle Assessment using life cycle sustainability assessment approaches for the use-phase analysis of the campus. E-LCA was applied to quantify the global warming potential and cumulative energy demand based on International Organization for Standardization 14,040 and 14,044 by considering the gate-to-gate approach. The environmental assessment results showed that the global warming potential of the campus was 2.92 tCO(2) eq./person, and the cumulative energy demand was found as 15.4 GJ/person. In LCC, the total cost of the campus was calculated as 200 US Dollars/person, and the energy cost is found as a major contributor with 86% of the total cost for the year of 2019. In the social performance assessment, it is found that the university has a weak social performance for the local community, the consumer, the worker, and the society.Article Citation - WoS: 8Citation - Scopus: 9Evaluation of Diatomite Substitute With Thermal Power Plant Waste Fly Ash in Sustainable Geopolymer Through Life Cycle Assessment(Springer, 2025) Ilkentapar, Serhan; Orklemez, Ezgi; Durak, Ugur; Gulcimen, Sedat; Bayram, Savas; Uzal, Nigmet; Atis, Cengiz DuranThis research demonstrates the potential of diatomite as a fly ash replacement to improve mechanical properties and environmental sustainability and presents it as a viable alternative for sustainable construction. Additionally, a life cycle assessment (LCA) was conducted on the produced mortars to quantitatively compare their environmental impacts using a cradle-to-gate approach. In mixtures, it was used by replacing the diatomite in the ratios of 1%, 2%, 3%, 4%, and 5% by weight of the fly ash. Workability, unit weight, flexural and compressive strength, abrasion resistance, elevated temperature resistance and microstructure analysis were carried out. The results indicated that replacing 1%, 2%, and 3% diatomite increased the compressive and flexural strength of mortars due to their higher specific surface area. Two percent replacement of diatomite provided the best results. FESEM results of 3% diatomite inclusion showed more intense and compact microstructure of geopolymer. Diatomite inclusion increased the abrasion resistance of geopolymer. Since 2% diatomite replacement was found to be optimum, the LCA results showed that geopolymer mortar with 2% diatomite has 25% lower impacts in terms of global warming potential and 10% lower impacts in terms of terrestrial ecotoxicity than conventional Portland cement mortar.Article Citation - WoS: 9Ni-Zn Metal-Organic Framework Based Membranes for Rejection of Pb (II) Ions(Elsevier, 2022) Senol-Arslan, Dilek; Gul, Ayse; Uzal, Nigmet; Yavuz, EmreThe present paper describes a sustainable and affordable supply of clean, and safe water approach to investigate Ni-Zn MOF embedded membrane for rejection of Pb (II) ions in aqueous solution. Ni-Zn MOF powder was prepared by solvo-thermal method, and then the Ni-Zn MOF embedded membranes with various concentrations (0.025 wt%, 0.05 wt% and 0.1 wt%). The membranes were fabricated by a common phase inversion method. Phase solutions of Pb(II) prepared with PVP at different concentrations in aqueous solutions. Water filtration and Pb (II) rejection tests were operated on a batch scale. The prepared Ni-Zn MOF powder characterized by FTIR, SEM-EDX analyses and zeta potential measurements. Ni-Zn MOF membranes were characterized by FTIR, SEM-EDX analysis, contact angle, and water permeability measurements. The effects of important parameters on adsorption including concentration and pH were investigated. The obtained results indicated that the maximum rejection of Pb(II) was 98% for a feed solution containing 80 mg Pb/L at pH 8 and assistance with 2 % PVP for 0.05 wt% Ni-Zn MOF membrane. Additionally, it was detected that blend membranes revealed better Pb(II) rejection than pure PSF membrane.Article Citation - WoS: 2Citation - Scopus: 2Integration of Direct Microfiltration and Reverse Osmosis Process for Resource Recovery From Municipal Wastewater(Elsevier Science inc, 2023) Ozcan, Ozlem; Sahinkaya, Erkan; Uzal, NigmetFor the sustainability of water resources, the recovery of water, organic matter (OM), energy, and nutrients from municipal wastewater become very attractive resources. As direct application of water, nutrient, and energy recovery from municipal wastewater cannot be feasible, the wastewater needed to be concentrated. In this study, the molecular weight distribution of OM content was determined in wastewater samples, up-concentration potential of direct microfiltration (DMF) of municipal wastewater and water recovery were investigated. In OM fractionation studies, around 52% of the chemical oxygen demand (COD) in wastewater was particulate or colloidal (>10 kDa) and 48% was soluble (<300 Da). In DMF tests, the COD concentration was concentrated up to 1,573 mg/L after sequential DMF experiments. Additionally, the theoretic total energy requirement of the DMF process was found around 0.3 kWh/m3 and it would be potentially energy positive. In crossflow experiments, the reverse osmosis (RO) process was performed using DMF effluent. When microfiltration and RO membranes were chemically cleaned, flux recovery rates of 100% and 99% were achieved, respectively. However, the foulants could not be completely removed during the cleaning according to scanning electron microscopy, atomic force microscopy, and attenuated total reflection-Fourier-transform infrared spectroscopy results of the virgin, fouled, and cleaned membranes. This study reveals that the DMF+RO process is a promising technology for the recovery of OM and water from municipal wastewater.
