Sevgi Tokgöz Güneş - Academia.edu (original) (raw)

Papers by Sevgi Tokgöz Güneş

Journal of The Faculty of Engineering and Architecture of Gazi University, Oct 7, 2022

Influence of the operating conditions on the performance of AF  The Anaerobic Digestion Model No... more Influence of the operating conditions on the performance of AF  The Anaerobic Digestion Model No.1 (ADM1) and PHREEQCI  The effect of denitrification and sulfate reduction on methanogenesis While there were high COD treatment efficiencies in the ADM1 model results, high losses were observed in wastewater treatment efficiencies in the experimental study. The model simulation of nitrate and sulfate reduction process and redox potential (EH) change, driven by organic carbon degradation, in conditions closed to the atmosphere is given in Figure A. In Zones 1 and 2, the attainment of the EH required for metagenesis is controlled by the NO3and SO4 2concentration and the reducing biomass. Figure A. Effect of nitrate and sulfate reduction on EH potential driven by dissolved organic carbon degradation (PHREEQCI model) Purpose: The treatability of synthetic molasses wastewater with the upflow anaerobic filter system in different filter material packing ratios, operation modes, and organic loading rates was investigated. In addition, a modeling study was carried out to analyzed anaerobic degradation proseses for AF100 continuous mode experimental operating parameters by implement the ADM1 directly in PHREEQCI. Theory and Methods: Reactors with different filter material packing ratios were operated at OLRs of 0.5-2 kgCOD/m³.day, 2 days of HRT. Experimental data were compared with ADM1 based PHREEQC model results in order to investigate anaerobic digestion mechanism in filter system. Results: According to experimental study results, while OLR increased, treatment efficiency decreased. Acceptable removal efficiencies were achieved in anaerobic treatment of wastewater for continuous operating mode and filter material packing ratio greater than 75%. Conclusion: In the combination of ADM1 model and PHREEQCI software is a powerful tool that can provide crucial decision support in understanding and solving problems in laboratory and industrial scale anaerobic treatment systems.

Dokuz Eylül Üniversitesi Sosyal Bilimler Enstitüsü dergisi, Dec 31, 2021

It is an accepted reality that an unsustainable production and consumption model is at the root o... more It is an accepted reality that an unsustainable production and consumption model is at the root of rising inequalities and crises in world economies. At this point, sustainable development has started to be adopted by countries as a model that does not compromise the ability to meet the needs of future generations' while at the same time fulfilling the needs of our day, that takes not only the quantitative growth but also environmental and social sustainability into account. Two of the goals for sustainable development declared by the United Nations for the year 2030 with the slogan of leaving no one behind are to end poverty manifesting itself in various ways from malnutrition to social ostracism and inability to participate in decisions and to actualize gender equality. One of the specific groups experiencing poverty is women with their disadvantageous position in society. It is of critical importance to eliminate gender inequality and women's poverty in order to transfer the knowledge, labor, sensitivity and creative power of the women's population, which makes up half of the society, into life to ensure sustainable development. In this study, women's poverty created by gender inequality in Turkey is examined on the bases of sustainable development. It has been concluded that a sufficient level of improvement has not been achieved in the disadvantaged situations of women in terms of access to education, labor force participation and representation in parliament. In this context, it can be said that the steps taken to eliminate women's poverty due to gender inequality since 1999, when sustainable development policies began to be implemented more intensively, should be carried to a higher level with regulations in economy and public policies

Journal of The Faculty of Engineering and Architecture of Gazi University, Feb 4, 2023

 Microfiltration of olive mill wastewater  Application of kinetic models  High correlation coe... more  Microfiltration of olive mill wastewater  Application of kinetic models  High correlation coefficients Figure A. Schematic flow diagram of the experimental setup Purpose: The aim of this study is to investigate the applicability of the kinetic models frequently used in the literature for organic matter removal in microfiltration systems. Theory and Methods: Laboratory scale microfiltration membrane system (Figure A) was operated at 100, 150 and 200 L/h flow rates, 1 bar pressure and 4 different microfiltration times of 30, 60, 90 and 120 minutes. The system was fed with olive oil industry wastewater with COD concentration of 120 g/L. The results obtained after microfiltration were analyzed using the Modified Stover-Kincannon model, Second Order Kinetic model and First Order Kinetic model. Results: The constants, Umax and KB, of the Modified Stover-Kincannon model produced values were 39,370-46,948 g/L.min and 80,114-96,883 g/L.min, respectively. The constants, b and a,of the Second-Order Kinetic model produced values of 2,0349-2,0807 and 2,5546-3,0527 1/min, respectively. Meanwhile, the average second-order COD removal rate, ks(2), was 39,3095-46,9741 1/min. In the First Order Kinetics model, the first-order COD removal rate constant, k1 was in the range of 0.8868-0.5286 1/min. These models give high correlation coefficients (R 2 = 100-97%). Conclusion: Although studies on the removal efficiency of organic matter for microfiltration systems have been carried out in the literature, their kinetic modeling studies are not available. Therefore, in this study, the applicability of the models that are frequently used in the literature for organic matter removal kinetics in microfiltration systems was investigated. The high correlation coefficients obtained show that these applied models can be used in microfiltration system design, thus predicting the behavior of the membrane.

NATO Security Through Science Series

... Turkish Standards Organization, TSE 266, 1997. Water Pollution Control Regulation, Official G... more ... Turkish Standards Organization, TSE 266, 1997. Water Pollution Control Regulation, Official Gazette, No: 19919, 1988. ST GÜNES AND A. TURKMAN on surfacewater and groundwater), 45 Haziran, øzmir, øzmir Su Kongresi, pp. 263275.

In almost all environmental problems, there is a need for knowledge or predictions of the solute ... more In almost all environmental problems, there is a need for knowledge or predictions of the solute concentrations in space and time. Through the whole cycle of a mining project, from the exploration and feasibility studies, permitting, active mining, to remediation, reclamation and closure of a mining site, there is a wide spectrum of environmental issues in which geochemical modeling can play a significant role. For example accurate prediction of acidic drainage from proposed mines is recognized by both industry and government as a critical requirement of mine permitting and long term operation. This paper demonstrates the practical application of geochemical speciationsolubility, inverse mass balance and reaction path models to describe water chemistry in abandoned Ala􀃺ehir (Manisa-Turkey) Hg mine.

Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi, May 1, 2012

Jeotermal sistemlerden kaynaklanan arsenik kirliliğinin yüzeyselsu ve yeraltısularında açığa çıkm... more Jeotermal sistemlerden kaynaklanan arsenik kirliliğinin yüzeyselsu ve yeraltısularında açığa çıkması, bu suların içme ve sulama amaçlı kullanımlarını riske sokmaktadır. Bu sulardaki, arsenik kirliliği sucul ekosistemleri de etkilemektedir. Çalışmada, Balçova (İzmir) ve Gediz Ilıca (Kütahya) jeotermal alanlarından kaynaklanan arseniğin, yüzeyselsu ve yeraltısularında taşınım ve türleri, depolanması ve giderim mekanizmaları incelenmektedir. Sularda, Phreeqc yazılımı ile türleştirme, çözünme/çökelme ve soğuk sular ile karışım dikkate alınmak suretiyle modellemeler yapılmıştır. Çalışmanın sonuçlarına göre, arsenik derişimlerinin mineral çökelimleri, adsorbsiyon, redoks (Eh) ve pH tarafından kontrol edilmekte olduğu saptanmıştır. Adsorpsiyon genellikle yeraltısularındaki arseniği kontrol eden ana proses iken, yüzeyselsularda yüksek arsenik derişimlerinin bulunması herhangi bir tepkisel taşınıma uğramadığını göstermektedir. The release of arsenic (As) from geothermal systems into surface waters and groundwaters compromises the use of these waters as drinking and irrigation water resources. In these waters, arsenic contamination can also affect aquatic ecosystems. This study examines the release of arsenic in Balçova (Izmir) and Gediz Ilıca (Kütahya) geothermal areas, its transport and speciation of As in the receiving waters, as well as the deposition and removal mechanisms occurring in the both natural environments. The systems are modeled using the Phreeqc code, taking into account aqueous speciation, dissolution/precipitation as well as , mixing with cold waters. The results of this study suggest that the partitioning is controlled by several processes including mineral precipitation, adsorption, pH and oxido-reduction. Adsorption is often the main process controlling the fate of As in the groundwater whereas in surface waters high As concentrations are due to its nonreactive behavior.

Çalışma boyunca, anaerobik filtre reaktörler melas içeren sentetik atıksuyla beslendi. Deneysel ç... more Çalışma boyunca, anaerobik filtre reaktörler melas içeren sentetik atıksuyla beslendi. Deneysel çalışmalar 37 ± 1°C sıcaklık aralığında, 2 günlük hidrolik alıkonma süresi için 0.5 ile 2.0 kg KOİ/m³.gün arasında değişen organik yükleme değerlerinde gerçekleştirildi. Filtre malzemesi doluluk oranına göre UAF 100, UAF 75, UAF 50 ve UAF 25 olarak adlandırılan yukarı akışlı dört reaktör yarı sürekli olarak işletildi. En yüksek KOİ (% 80), TK (% 70) ve TUK (% 66) giderme verimleri tam dolu olan UAF 100 reaktöründe 0.5 kg KOİ/m 3 .gün organik yükleme değerinde, en düşük KOİ (% 40), TK (% 31) ve TUK (% 27) giderme verimleri ise, en az dolu olan UAF 25 reaktöründe 2.0 kg KOİ/m 3 .gün organik yükleme değerinde elde edilmiştir. During the study anaerobic filter reactors were fed with the synthetic wastewater containing molasses. Experimental studies were examined at different organic loading rates varied between 0.5 and 2.0 kg COD/m³day for hydraulic retention time (HRT) of 2 days at temperature range of 37 ± 1°C. Four upflow anaerobic filter reactors called as UAF 100, UAF 75, UAF 50 and UAF 25 according to filter material ratio were operated at semi-continuous operation mode. The highest COD (80%), TS (70%) and TVS (66%) removal efficiencies were achieved in fully packed UAF 100 at 0.5 kg COD/m 3 .day and the lowest COD (40%), TS (31%) and TVS (27%) removal efficiencies were achieved in least packed UAF 25 at 2.0 kg COD/m 3 .day of organic loading rate.

Pamukkale University Journal of Engineering Sciences, 2017

Su dağıtım şebekeleri, genellikle, şebekede basınç açısından en kritik noktalarda yeterli basınç ... more Su dağıtım şebekeleri, genellikle, şebekede basınç açısından en kritik noktalarda yeterli basınç olacak şekilde işletilir. Ancak günün saatleri içindeki debi salınımlarına uyacak ve enerji tüketimini en aza indirecek bir işletme tipi yerine, işletme kolaylığı için, genellikle, basınçların en düşük basıncın oldukça üstünde olduğu düşük basınç şikayetlerine göre bir işletim uygulanmaktadır. Su dağıtım sistemlerinde, zaman, tüketilen su miktarı ve basınç gibi parametreler dikkate alınarak şebeke işletiminin iyileştirilmesi, hem sistemde su kayıplarının önlenmesi hem de enerji verimliliğinin arttırılmasını sağlar. Yerel yönetimler için önemli bir maliyet kalemi olan içmesuyu dağıtım sistemlerindeki enerji tüketimi şebekenin optimum işletimi ile önemli miktarda azaltılarak enerji tasarrufu sağlanabilmektedir. Bu çalışmada, bir organize sanayi bölgesinin su dağıtım şebekesi örnek şebeke olarak ele alınmıştır. Örnek şebekede, su tüketim farklılıkları esas alınarak üç ayrı işletme bölgesi o...