E.B. Ozkaraova - Academia.edu (original) (raw)

Papers by E.B. Ozkaraova

Ogretmenler, okullarda ogretim programlarinin uygulayicisi konumundadir. Ogretim programlari da o... more Ogretmenler, okullarda ogretim programlarinin uygulayicisi konumundadir. Ogretim programlari da ogretmenler icin onemli bir rehber niteliginde olup bunlarin degisen egitim anlayisina gore yapilmasi ve tekrar duzenlenmesi de oldukca onemlidir. Bu anlayisla program tasarisi niteliginde olan bu calismada lise 1. sinif biyoloji dersi “Yasamin Temel Bilesenleri” unitesinin analizi ve asamalilik iliskisi hazirlanmistir. Bu amacla oncelikle MEB programina gore unitenin icerigi belirlenmistir. Daha sonra Bloom’un tam ogrenme modeline gore bilgi basamagindan uygulama basamagina kadar unitenin hedefleri tespit edilmistir. Son olarak belirlenen bu hedefler arasindaki asamalilik iliski tablosu ve degerlendirme araci olarak kullanilan belirtke tablosu hazirlanmistir

Journal of Electroanalytical Chemistry

In the present study, coupling electro-Fenton (EF) and adsorption processes for textile industry ... more In the present study, coupling electro-Fenton (EF) and adsorption processes for textile industry wastewater remediation was investigated, in both batch and continuous flow modes. Sepiolite was used as an adsorbent in the coupled EF/adsorption processes. Various parameters such as reaction time, current intensity, Fe 2+ concentration , sepiolite dose, and flow rate were found to affect the efficiency of the coupled processes. In comparison to the single EF process, a synergistic effect occurred in the coupled EF/adsorption processes, leading to better performance for COD and TOC removal from textile wastewater. Thus, in the single EF technology, using graphite felt electrodes, COD and TOC removal efficiencies from real textile wastewater, were 58 % and 36 %, respectively. However, in the coupled EF/adsorption processes, COD and TOC removal efficiencies increased to 85 % and to 63 %, respectively. The higher COD and TOC removals may be attributed to the combined effect of adsorption and oxidation reactions in coupled EF/adsorption process. Moreover, Artificial Neural Networks (ANN) model was built up in order to estimate COD and TOC removal efficiencies of the coupled EF/adsorption processes. A good correlation was found between the ANN model theoretical prediction, and the experimental data, for COD and TOC removals, in both batch and continuous modes. The novelty of the current work lies in the synergistic effect occurring between the EF and adsorption processes in wastewater treatment and provides the ANN model as a valuable tool for describing COD and TOC removal efficiencies under different experimental conditions.

Advanced Oxidation Processes for Wastewater Treatment, 2022

Soil and Water Research, 2021

In order to increase the reuse of wastes and residues, as required by the Waste Framework Directi... more In order to increase the reuse of wastes and residues, as required by the Waste Framework Directive, the potential use of waste, residue and natural minerals as low-cost permeable reactive barrier (PRB) materials was investigated. The performance of a kitchen waste compost, sepiolite and steel slag was compared with that of volcanic slag, pumice and activated carbon in removing specific contaminants from landfill leachate. The experiments represented that the activated carbon removed 27% of the ammonium (NH4+), 75% of the chemical oxygen demand (COD) and 100% of the phosphate (PO43–), zinc (Zn2+) and nickel (Ni2+) from the landfill leachate. Volcanic slag exhibited removal efficiencies of 50% COD and 100% PO43– and pumice exhibited removal efficiencies of 20% NH4+, 27% Zn2+, 65% COD and 100% PO43–. The reactive materials were also checked for their potential in releasing unwanted constituents and represented different levels of the solute (e.g., PO43–, SO42–, NH4+) release. Among th...

Water and Environment Journal, 2021

Easily available organic substrates (e.g., peanut, walnut and almond shells and luffa sponge) wer... more Easily available organic substrates (e.g., peanut, walnut and almond shells and luffa sponge) were evaluated as potential filter material for permeable biobarrier systems. Higher removal efficiencies and rate constants were observed for lower (20%) substrate (e.g., peanut, walnut and luffa sponge) percentages indicating to the importance of substrate percentage. Rate constants were higher for total inorganic nitrogen removal (≥0.137 mg N/L/d) than for nitrate removal (≥0.127 mg N/L/d) in the batch bioreactors promising the capability of microorganisms in consuming substrate released nitrogen compounds. Continuous flow biobarriers revealed greater removal efficiencies (<1 mg NO3−–N/L) and rate constants (≥2.38 mg NO3−–N/L/d) that were related to better microbial performance with increased substrate contact. Different dissolved oxygen levels observed for peanut shell (≤7.45 mg O2/L) and luffa sponge columns (<3 mg O2/L) were indicating to the existence of different mechanisms and microorganisms during simultaneous heterotrophic nitrification and aerobic or anoxic denitrification. Luffa sponge was found to be the best candidate as a biobarrier substrate for a longer timescale, although walnut and almond shells may be excellent materials both supporting the denitrification process and permeability of barrier system.

DESALINATION AND WATER TREATMENT, 2017

Soils contaminated by polycyclic aromatic hydrocarbons (PAHs) pose potential risks to human healt... more Soils contaminated by polycyclic aromatic hydrocarbons (PAHs) pose potential risks to human health and the environment. In this study a combined physical-chemical treatment involving soil washing and advanced oxidation was investigated. A fluorene contaminated loamy soil was treated with a washing solution containing a non-ionic surfactant polyoxyethylene 20 cetyl ether (Brij 58). The washing solution containing fluorene (48.5-54.3 mg/L) was afterwards treated with Fenton and electro-Fenton oxidation. The conventional Fenton oxidation results revealed a fast removal of fluorene (>84%) within the first 15 min. COD removal representing the general destruction of washing solution remained at about 10%, but increased to 81% when the reaction time was increased to 480 min using 2% hydrogen peroxide (H 2 O 2). The corresponding fluorene removal was about 98%. The pseudo-second order rate constants observed for fluorene (0.0016 L/mg min) and COD (1.5 × 10-6 L/ mg min) oxidation supported these results by indicating to a faster oxidation of fluorene. Increase in the H 2 O 2 concentration similarly influenced the oxidation of COD rather than fluorene. The COD removal efficiency increased from 43% to 97% when the H 2 O 2 concentration was increased from 2% to 10% for a treatment time of 120 min. Electro-Fenton oxidation studies with a current density of 15 mA/cm 2 and an electrolyte conductivity of 2 mS/cm revealed even better results enabling a reduction in reaction time. 60 min of reaction time with 2% H 2 O 2 represented removal efficiencies of 98% and 91% for fluorene and COD, respectively.

Environmental Technologies, 2008

Geoderma, 2010

The complexation properties of humic substances, the stability of the dissolved humic-metal compl... more The complexation properties of humic substances, the stability of the dissolved humic-metal complex, and the interaction of complex with other soil constituents determine the solubility and mobility of heavy metals. This study investigated the influence of humic and fulvic acid on the release of zinc of soils from Fethiye (Mediterranean Region); Samsun (Black Sea Region); and Izmir (Aegean Region). The time-dependent release of zinc from the soil was evaluated using plots of logarithm of q t /q s versus time. The kinetics of zinc release by humic acid was characterised by two pseudo-first-order reactions. The observed rate coefficients in our model were k 1 =4.2×10 − 3 h − 1 and k 2 =5×10 − 5 h − 1 , which indicated to an initial fast reaction followed by a slower reaction. The release of zinc increased with increasing humic acid concentration representing an approach to plateau formation at the higher humic concentrations. The highest releases of 334.5, 350.8 and 369.4 μmol kg − 1 for Fethiye, Samsun and Izmir soils, respectively, were obtained for a humic acid concentration of 1000 mg L − 1. A different situation was observed in treatments with 150 mg L − 1 humic acid solutions, where the precipitative removal of humic acid-zinc complexes occurred at about pH 7. The interactive behaviour of humic acid-zinc complexes represented a similar reduction in the zinc concentrations in aqueous solution. A rise in the zinc load caused only a slight increase in release, which indicated that zinc load had little effect on release. Changes in soil suspension pH reflected higher zinc releases. An increase in the suspension pH to approximately 10.5 resulted in an increase from 209.4 μmol kg − 1 to 280.2 μmol kg − 1 (300 mg L − 1 humic acid), which was attributed to the involvement of other functional groups like phenolic groups in the process. On the other hand, decreasing the suspension pH to about 5 revealed to an increase from 89 μmol kg − 1 to 602.7 μmol kg − 1 (100 mg L − 1 humic acid), which was determined to be mainly the contribution of acidity. The influence of humic acid sorption on zinc release was investigated by evaluating sorption behaviour with respect to pH, salt, clay, oxide and organic matter contents of soils. Sorption of humic acid on soils presented a linear behaviour, and as the partition and distribution coefficients imply, was highest for Fethiye Soil, followed by Samsun and Izmir soils. Since this order reflected the reverse order of zinc release from soils, the degree of zinc release from soils was related to the degree of humic acid sorption. Thus, the greatest release of zinc from Izmir Soil was explained by the low humic acid sorption. The release of zinc from soil was lower for fulvic acid solutions, despite its higher acidic functional group content. For fulvic acid concentration of 300 mg L − 1 , a zinc release of 46.7, 85.7 and 148.5 μmol kg − 1 was obtained for Fethiye, Samsun and Izmir soils, respectively. This was linked to the strength of bonds involved in the process, as shown by the stability constants of zinc humic or fulvic acid complexes.

CLEAN - Soil, Air, Water, 2013

ABSTRACT

DESALINATION AND WATER TREATMENT, 2019

Legislative measures like the Waste Framework Directive enforce the European Union member countri... more Legislative measures like the Waste Framework Directive enforce the European Union member countries to increase the re-use of waste and/or the extraction of secondary raw materials. The Nitrate Directive requires the implementation of relevant measures to decrease groundwater nitrate concentration. This study evaluated the potential use of two dominant organic wastes in Turkey, tea factory waste and hazelnut husk, as potential carbon sources to stimulate nitrate removal in low cost permeable reactive barrier (PRB) systems. Leaching and batch experiments were carried out to determine the dissolution level and the degree of the heterotrophic denitrification process. Both organic substrates and inherent microbial communities supported the reduction of nitrate (NO 3-) to nitrogen (N) gases. However, the percentage of organic substrate played an important role in the removal of nitrogenous compounds. The highest nitrate removal efficiencies were observed in flasks with 40% tea factory waste and 100% hazelnut husk, which were 64% and 97%, respectively. The corresponding zero-order reaction rates and half-lives were 3.03 mg N L-1 d-1 and 6 d-1 for tea factory waste and 5.17mg N L-1 d-1 and 4.4 d-1 for hazelnut husk. Of particular note, both wastes supported the denitrifying populations at such an excellent level that 99% of the nitrate was removed in the column study for a duration of 51 d under low and high flow rate conditions. Thus, the release of nitrate, ammonium and total organic carbon from wastes was not limiting its suitability in PRB systems.

Journal of International Environmental Application and Science, 2020

The aim of this study was to investigate the adsorption performance of a low-cost adsorbent, diat... more The aim of this study was to investigate the adsorption performance of a low-cost adsorbent, diatomite, for the treatment of real textile wastewater. Effect of adsorbent dosage, contact time and particle size on color and COD removal was investigated. The results showed that color removals were achieved within a relatively short time and while COD removals increased with increasing contact time. Diatomite dosage was found to be a critical parameter especially for the COD removal. COD removal increased from 37% to 57% with an increase in diatomite dosage from 10 g/L to 150 g/L. Particle size, on the other hand, presented different removal trends. As color removal was slightly increased (<5%) with decreasing particle size, a higher COD removal (70%) was observed for the smallest particles size (<425 mm). The influence of thermal and acid/alkaline pre-treatments on the performance of the natural diatomite was also evaluated. Thermal treatments significantly decreased the medium E...

Black sea journal of agriculture, Sep 19, 2022

Harmful substances in the wastewater negatively affect the ecological balance by reducing the dis... more Harmful substances in the wastewater negatively affect the ecological balance by reducing the dissolved oxygen concentration. High phosphorus and nitrogen compounds discharged into surface water resources may cause to eutrophication, due to increased algal growth. In this study, Elodea densa (Egeria), Lemna minor (Duckweed), Micranthemum micranthemoides (Micra), Pistia (Water Lettuce), Ceratophyllum demersum (Foxtail) plants were investigated for the removal of nitrate and ammonium from rice field drainage water. Synthetic drainage water was prepared to rely on the literature and real rice field drainage water composition from the Samsun Bafra region. Artificial wetland studies were carried out as individual systems in order to understand the treatment ability of each plant and as a combined system in batch and continuous flow mode. pH, electrical conductivity, dissolved oxygen, nitrate, and ammonium values were measured periodically. Results of the individual plant wetland system represented that the wetland plant Elodea densa revealed the highest nitrate removal efficiency (77%) at the end of 1 day, followed by Pistia (76%). It was observed that the treatment efficiency increased with increasing hydraulic retention time. In the combined system, the nitrate removal efficiency was 40%, while the ammonium removal efficiency was 51% at the end of the first day. It was concluded that the wetland plants successfully reduced the ammonium and nitrate content of the drainage water and showed resistance to the drainage water with high salinity. In the wetland experiments carried out under continuous flow mode, ammonium was reduced from 0.80 mg/L to 0.10 mg/L, while nitrate was reduced from 1.90 mg/L to 1.40 mg/L, yielding approximately 90% and 30% at the end of the 16th day. Studies have in general revealed the importance of plant type as well as residence time.

International Journal of Electrochemical Science, 2020

Soil washing has been widely used together with other remediation techniques to increase the over... more Soil washing has been widely used together with other remediation techniques to increase the overall removal efficiency of hydrophobic pollutants. In this study, the combined effects of soil washing followed by the electro-Fenton process were investigated. A loamy soil contaminated with fluorene (368.8 mg/kg) was used in a washing process including the non-ionic surfactant polyoxyethylene 20 cetyl ether (Brij 58). A total of 222.6 mg/kg fluorene was removed with 1% Brij 58 solution and a soilto-solution ratio of 1/5, which were determined to be the optimum treatment conditions. Both the firstorder, two-compartment model and pseudo-second-order model described fluorene solubilization very well, implying that fluorene solubilization proceeded in two stages and that the fluorene concentration gradient in the washing solution influenced the process. Evaluation of Brij 58 adsorption together with fluorene removal revealed that adsorption and the release of organic constituents (Brij 58 and dissolved soil organic constituents) and fluorene from the soil seemed to occur simultaneously. The treatment of the Brij washing solution with the electro-Fenton process presented a fluorene removal efficiency of approximately 92.8% with 2% H2O2 and a reaction time of 60 min, a current density of 15 mA/cm 2 and an electrical conductivity of 2 mS/cm. The corresponding total destruction of the washing solution was approximately 67.6%. The results showed that with proper optimization of operational parameters, a strategy for the removal of target contaminants can be accomplished, enabling the reuse of the washing solution.

, in 1993. She was employed as a research assistant at the Boğaziçi University between 1996 and 2... more , in 1993. She was employed as a research assistant at the Boğaziçi University between 1996 and 2002. She holds a PhD in Environmental Technology on Soil Contaminant Interaction and Pollution Remediation and a MSc on Advanced Oxidation Processes. Over the past fifteen years, her primary research focus has been in the area of soil contaminant interaction, soil and ground water pollution, pollution control and remediation, and solid waste management. She worked as a project leader and researcher in projects like "Evaluation of the Soil Pollution Potential in the Middle Black Sea Region," "A Comparative Investigation of Heavy Metal Removal from Aegean, Mediterranean and Black Sea Region Soils," "Soil Pesticide Interactions and Investigation of Alternative Removal Methods." Regularly, she publishes academic papers, serves as peer-reviewer for various international academic journals, and for scientific activities. She is a member of the Chamber of Environmental Engineers.