Phd Degree / Doktora

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  • Doctoral Thesis
    Investigation of Bioelectrochemical Treatment Efficiency for Removal of Boron From Geothermal Waters
    (Izmir Institute of Technology, 2022) Gören, Ayşegül Yağmur; Ökten, Hatice Eser; Baba, Alper; Ökten, Hatice Eser; Baba, Alper; 03.07. Department of Environmental Engineering; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Microbial desalination cell (MDC) is a promising technology due to its simultaneous features of electricity production, wastewater treatment, and desalination. In this thesis, boron (B) removal from geothermal water and organic matter removal from yeast wastewater with energy production was studied using a three chamber (anode/desalination/cathode) lab-scale MDC system. Among operational conditions, electrode surface area was proven to be significant on B removal efficiency. Then, anode chamber of the conventional MDC was modified to include three-dimensional (3D) cubic electrodes as a novel design. B and organic matter removal efficiencies and the produced power density results were promising for 3D-electrodes. Further studies in order to increase the efficiency of MDC system was conducted by synthesizing 3D hybrid sponge electrodes with activated carbon-chitosan (AC-CS). MDC with 3D AC-CS anode provided a higher power density of 970 mW/m2 , B removal efficiency of 75.9%, and COD removal efficiency of >90% under optimized conditions. Furthermore, phytoremediation performance of Lemna minor L. on B removal was found to be 96.7 %. Also, removal of B and heavy metals from reverse osmosis (RO) permeate and concentrate streams using RO-MDC hybrid process was studied. The performance of ROMDC system was proven to be significant on B and heavy metals removal efficiency. Lastly, feasibility of B removal from geothermal water using MDC-Donnan dialysis hybrid process was evaluated. The most important output of this study was decreased frequency for pH adjustment. Overall, MDC, being in its early levels of technology readiness, produced promising desalination and energy production results in removal of boron from geothermal brine.
  • Doctoral Thesis
    Three Dimensional Numerical Modelling of Recharce: Case Study: Eğri Creek Sub-Basin, İzmir
    (01. Izmir Institute of Technology, 2022) Tayfur, Gökmen; Baba, Alper; Tayfur, Gökmen; Baba, Alper; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Although the science of water management has experienced significant improvements over the past century, many issues still require the attention of the scientific community. Global change, growing population and increasing pressure on existing water supplies have intensified the need for further improvement of water resources management practice. The purpose of this special issue is to present some of the latest research carried out in the area of water resources management under uncertain and changing conditions. Study in this issue highlight recent consuming in this basin covering all the surface & groundwater of the hydrologic cycle. The large demand for drinking, irrigation and industrial water in the region of K. Menderes Basin. The main objective of the study is to emerge capacity of surface and groundwater. Also, notice that decreasing groundwater level in basin. This river basin agricultural dominant has fertile land and range of harvest diversity in all season. In dry periods, Groundwater level has been facing decreases for past 30 years. Every private farm has private wells that were drilled without permission. These cause depletion of groundwater and restraining the usage of groundwater. Another subject is industrial usage of groundwater and increasing population in area. For this purpose, surface artificial recharge methods in conjunction with underground dam construction were investigated in Egri Creek sub-basin. Thus, their contributions to the groundwater levels were investigated with the help of a numerical model.