Ismail Ozbay - Academia.edu (original) (raw)

Papers by Ismail Ozbay

Supplemental material, 549796_supp_mat for Possibility of the most cost efficient choice: A divid... more Supplemental material, 549796_supp_mat for Possibility of the most cost efficient choice: A divided process approach to method and location selection for municipal solid waste management by M. Kemal Korucu, Ahmet Cihan, Atakan Alkan, Ismail Ozbay, Aykan Karademir and Zerrin Aladag in Waste Management & Research

Clean Technologies and Environmental Policy, 2013

Although there are numerous adsorption studies performed by using various adsorbents, there is no... more Although there are numerous adsorption studies performed by using various adsorbents, there is no deterministic knowledge about selection of appropriate adsorbent type from present alternatives. In order to evaluate the advantages of the selected adsorbent species mathematically, researchers may use economical models such as cash flow diagrams, cost-benefit analyses, and alternative selection methods. In spite of the fact that these models have been used in many other engineering branches they are rarely applied in environmental research. In this study we have aimed to investigate usability of the mentioned economical models in adsorption of reactive azo dyes from aqueous solutions. Activated ash, a waste material, and commercial granular activated carbon were decided to be adsorbent alternatives. By applying economical models appropriate adsorbent type was selected considering both adsorption efficiencies and economical conditions. Although similar tendencies were monitored in cash flow diagrams; considering the amount of expenses activated ash exhibited remarkable advantages compared to granular activated carbon. Furthermore, results of costbenefit analyses showed that activated ash has been advantageous when total costs and profits were evaluated together. Results of this study suggest usage of these economical models even in adsorption studies in order to provide accurate information on the selection of appropriate adsorbent type. These methods enable evaluation of economical conditions, which is generally neglected, together with the obtained removal efficiencies.

Bioresource Technology, 2012

In this study, after nine cylindrical bales containing a mix of different waste materials were co... more In this study, after nine cylindrical bales containing a mix of different waste materials were constructed, they were stored in the open air and temporal variations of CO 2 , CH 4 , O 2 , and N 2 were monitored over 10 months. In each bale, different waste fractions were considered in order to represent different moisture contents. The results showed that CO 2 increased within very few days to approximately 80% and stabilized later in the range of between 10% and 35% in a month. The O 2 levels dropped from approximately 15% to significantly less than 1%. There was no significant anaerobic decomposition since CH 4 did not exceed 5% during the whole test period. N 2 exhibited an opposite pattern with CO 2. In addition, relationships between waste species in the bales and gas formations were determined by a bivariate correlation analysis. An empirical prediction model for the maximum CO 2 production was also developed.

Desalination and Water Treatment, 2013

This paper investigates the usability of activated charcoal ash for removal of reactive azo dye f... more This paper investigates the usability of activated charcoal ash for removal of reactive azo dye from aqueous solution. Firstly, elemental composition and surface characteristics of the ash have been examined by using X-ray fluorescence and scanning electron microscopy. The effects of pH, ash dosage, initial dye concentration, agitation period, agitation speed, and temperature were determined by batch experiments. Calculated thermodynamic parameters indicated exothermic and spontaneous characteristics of the adsorption process. Langmuir, Freundlich, and Temkin adsorption isotherms were applied to examine the efficiency of charcoal ash. The obtained correlation coefficients and the considered isotherm parameters showed fitness of the applied isotherm models. Pseudo-second-order kinetic model was found to best represent the kinetic data considering closer values of experimental and calculated dye amounts adsorbed by unit ash mass. Results of the study demonstrated usability of activated charcoal as a promising adsorbent in dye adsorption.

Proceedings of the Institution of Civil Engineers - Waste and Resource Management

This study examines municipal solid waste (MSW) management systems in two cities in developing co... more This study examines municipal solid waste (MSW) management systems in two cities in developing countries at different phases of development: Sekondi-Takoradi, Ghana and Kocaeli, Turkey. The waste management strategies, including composition, from the two cities are compared, and the methods of MSW management in Kocaeli are discussed and options for waste management in Sekondi-Takoradi are considered as well as how lessons could be learnt from the development and operation of Kocaeli's system that will help implement integrated and sustainable waste management systems in Sekondi-Takoradi, Ghana. The results of the study showed difference in waste composition and wide variations in waste management structure between the two municipalities. An average per capita waste generation of 0.92 and 0.70 kg/day, an organic fraction of 141 and 158 kg/year and 31 and 26% of recyclable waste are recorded for Kocaeli and Sekondi-Takoradi, respectively. The paper further highlights how the two d...

Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2021

This study examines municipal solid waste (MSW) management systems in two cities in developing co... more This study examines municipal solid waste (MSW) management systems in two cities in developing countries at different phases of development: Sekondi-Takoradi, Ghana and Kocaeli, Turkey. The waste m...

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

Özet: Bu çalışmada bir gıda endüstrisi atıksuyunun alüminyum elektrot kullanılarak kesikli sistem... more Özet: Bu çalışmada bir gıda endüstrisi atıksuyunun alüminyum elektrot kullanılarak kesikli sistemde elektrokoagülasyon yöntemi ile arıtımı incelenmiştir. Anaerobik arıtma çıkışından alınan atıksuyun özellikleri 504 mg/L KOI, 100 mg/L TOK, 3.37 mS/cm iletkenlik ve 7.8 pH parametreleri ile karakterize edilmiştir. Elektrokoagülasyon prosesinin etkinliği KOİ parametresindeki değişim gözlenerek değerlendirilmiştir. Çalışmada pH, iletkenlik, akım yoğunluğu ve reaksiyon süresinin etkisi incelenmiştir. Elde edilen sonuçlardan optimum koşullar pH=7, iletkenlik=3.5 mS/cm, akım yoğunluğu =1.83 mA/cm 2 ve süre=30 dak. olarak belirlenmiştir. Bu koşullarda %95 KOİ giderim verimi elde edilirken işletme maliyeti de 0.98 TL/m 3 arıtılan atıksu olarak belirlenmiştir.

akademikpersonel.kocaeli.edu.tr

ABSTRACT: Municipal solid waste (MSW) baling is usualy used as a convenient method for temporary ... more ABSTRACT: Municipal solid waste (MSW) baling is usualy used as a convenient method for temporary storage in landfills. However, considerable environmental and safety problems may occur because of improper construction and handling. Therefore, MSW bales should ...

The aim of this work was to determine sorption-desorption behavior of atrazine in soil from Antal... more The aim of this work was to determine sorption-desorption behavior of atrazine in soil from Antalya, Turkey. Batch experiments were conducted to investigate the sorption isotherm and sorptiondesorption characteristics of atrazine. The sorption isotherm and kinetic studies showed that the sorption of atrazine was described by nonlinear and rate-limited processes for soil. Results indicate that organic matter content of soil has played major role on sorption behavior of atrazine (Kf= 3). Inorganic components could have contribution for influencing the sorption of atrazine. Results summarize that sorption of atrazine to calcareous soil with sandy loam texture was moderate which could lead to a possibility of contamination of groundwater resources. The results from the present study would also help in designing of effective herbicide management strategies in Antalya, Turkey. Key-Words: Antalya, atrazine, heterogeneous soils, isotherm, kinetic, sorption.

International Journal of Environmental Analytical Chemistry, 2021

Agricultural Waste and Residues, Aug 29, 2018

The potential for thermal recovery of waste is increasingly gaining impetus among researchers and... more The potential for thermal recovery of waste is increasingly gaining impetus among researchers and industries across the globe especially in many developed countries. However, in processing waste for energy recovery, the type and nature of input waste materials particularly those with high moisture content have a significant impact in determining the quality, environmental profile of the waste as well as the thermal properties of the final product. Bio-drying, as a waste to energy conversion technology, tends to reduce moisture content of waste while maintaining the energy content of the processed waste. The current study investigates the effect of input materials (biogenic and non-biogenic materials) on the energy and biogenic contents of waste material by bio-drying process. The results indicated a positive correlation between biogenic and energy contents of the input materials with some variations observed. Further analysis showed that, high proportion of food waste in the waste mix indicated a slight difference in biogenic and energy contents. Conversely, the same proportion of paper in the waste mix showed similar biogenic content with slight variation in energy content.

Water and Environment Journal

Effluents coming from potato chips manufacturing have high organic loads and require adequate tre... more Effluents coming from potato chips manufacturing have high organic loads and require adequate treatment before discharge to environment. In this study, O3/UV/H2O2 advanced oxidation process was applied to treat these wastewaters. With this aim, batch experiments were conducted in a reaction tank equipped with ozone injection and UV irradiation. Process variables were determined to be pH, ozone concentration, reaction time, H2O2 dosage and efficiency of the system was evaluated considering total organic carbon (TOC) removal. Central composite design technique was applied to examine the individual and synergetic effects of the experimental factors. A quadratic model was developed to maximize the TOC removal. Furthermore, operation costs were calculated for different experimental conditions and interactions between process variables and costs were analysed.

International Journal of …, 2008

Biologically produced hydrogen using biomass and mixed bacterial cultures is one approach to gene... more Biologically produced hydrogen using biomass and mixed bacterial cultures is one approach to generate renewable H 2 . Response surface methodology (RSM) was used to study the effect of initial pH (3.88–8.12) and initial substrate concentration (0.86–29.14 g/L) on both ...

Environmental Engineering and Management Journal

The aim of this study was to evaluate the results of an urban pilot project on separate collectio... more The aim of this study was to evaluate the results of an urban pilot project on separate collection of packaging wastes. The project has been performed in a developed and industrialized city of Turkey, Kocaeli with the aim of collecting packaging wastes generated in residents, public offices and other business offices. The project was carried out according to packaging waste management plans developed by sub-municipalities in coordination with Kocaeli Metropolitan Municipality. Total monthly collected packaging waste amounts have increased from 423.75 ton to 2891.16 ton during a 2-year period. Despite the increase in collected packaging waste amounts, collection efficiencies could not exceed 50% throughout the project. This can be explained by the absence of law enforcement in Packaging and Packaging Waste Control Act about separate collection of packaging wastes. The project was carried out by volunteers. Results of the study showed that collection efficiencies exhibited differences between the regions as a result of varying socioeconomic conditions, number of distributed collection equipments and intensity of educational activities. In the paper, impacts of various socioeconomic conditions and educational activities were also evaluated statistically by bivariate correlation analysis. Remarkable positive correlations were determined for the relationships between the quantity of distributed collection equipments and the collected packaging waste amounts. Educational activities were also found be effective with R 2 values higher than 0.60. Population density and educational status of the regions have exhibited lower positive correlations explained by R 2 values of 0.007 and 0.184.

Water, Air, & Soil Pollution

Water and Environment Journal

Water, Air, & Soil Pollution

Supplemental material, 549796_supp_mat for Possibility of the most cost efficient choice: A divid... more Supplemental material, 549796_supp_mat for Possibility of the most cost efficient choice: A divided process approach to method and location selection for municipal solid waste management by M. Kemal Korucu, Ahmet Cihan, Atakan Alkan, Ismail Ozbay, Aykan Karademir and Zerrin Aladag in Waste Management & Research

Clean Technologies and Environmental Policy, 2013

Although there are numerous adsorption studies performed by using various adsorbents, there is no... more Although there are numerous adsorption studies performed by using various adsorbents, there is no deterministic knowledge about selection of appropriate adsorbent type from present alternatives. In order to evaluate the advantages of the selected adsorbent species mathematically, researchers may use economical models such as cash flow diagrams, cost-benefit analyses, and alternative selection methods. In spite of the fact that these models have been used in many other engineering branches they are rarely applied in environmental research. In this study we have aimed to investigate usability of the mentioned economical models in adsorption of reactive azo dyes from aqueous solutions. Activated ash, a waste material, and commercial granular activated carbon were decided to be adsorbent alternatives. By applying economical models appropriate adsorbent type was selected considering both adsorption efficiencies and economical conditions. Although similar tendencies were monitored in cash flow diagrams; considering the amount of expenses activated ash exhibited remarkable advantages compared to granular activated carbon. Furthermore, results of costbenefit analyses showed that activated ash has been advantageous when total costs and profits were evaluated together. Results of this study suggest usage of these economical models even in adsorption studies in order to provide accurate information on the selection of appropriate adsorbent type. These methods enable evaluation of economical conditions, which is generally neglected, together with the obtained removal efficiencies.

Bioresource Technology, 2012

In this study, after nine cylindrical bales containing a mix of different waste materials were co... more In this study, after nine cylindrical bales containing a mix of different waste materials were constructed, they were stored in the open air and temporal variations of CO 2 , CH 4 , O 2 , and N 2 were monitored over 10 months. In each bale, different waste fractions were considered in order to represent different moisture contents. The results showed that CO 2 increased within very few days to approximately 80% and stabilized later in the range of between 10% and 35% in a month. The O 2 levels dropped from approximately 15% to significantly less than 1%. There was no significant anaerobic decomposition since CH 4 did not exceed 5% during the whole test period. N 2 exhibited an opposite pattern with CO 2. In addition, relationships between waste species in the bales and gas formations were determined by a bivariate correlation analysis. An empirical prediction model for the maximum CO 2 production was also developed.

Desalination and Water Treatment, 2013

This paper investigates the usability of activated charcoal ash for removal of reactive azo dye f... more This paper investigates the usability of activated charcoal ash for removal of reactive azo dye from aqueous solution. Firstly, elemental composition and surface characteristics of the ash have been examined by using X-ray fluorescence and scanning electron microscopy. The effects of pH, ash dosage, initial dye concentration, agitation period, agitation speed, and temperature were determined by batch experiments. Calculated thermodynamic parameters indicated exothermic and spontaneous characteristics of the adsorption process. Langmuir, Freundlich, and Temkin adsorption isotherms were applied to examine the efficiency of charcoal ash. The obtained correlation coefficients and the considered isotherm parameters showed fitness of the applied isotherm models. Pseudo-second-order kinetic model was found to best represent the kinetic data considering closer values of experimental and calculated dye amounts adsorbed by unit ash mass. Results of the study demonstrated usability of activated charcoal as a promising adsorbent in dye adsorption.

Proceedings of the Institution of Civil Engineers - Waste and Resource Management

This study examines municipal solid waste (MSW) management systems in two cities in developing co... more This study examines municipal solid waste (MSW) management systems in two cities in developing countries at different phases of development: Sekondi-Takoradi, Ghana and Kocaeli, Turkey. The waste management strategies, including composition, from the two cities are compared, and the methods of MSW management in Kocaeli are discussed and options for waste management in Sekondi-Takoradi are considered as well as how lessons could be learnt from the development and operation of Kocaeli's system that will help implement integrated and sustainable waste management systems in Sekondi-Takoradi, Ghana. The results of the study showed difference in waste composition and wide variations in waste management structure between the two municipalities. An average per capita waste generation of 0.92 and 0.70 kg/day, an organic fraction of 141 and 158 kg/year and 31 and 26% of recyclable waste are recorded for Kocaeli and Sekondi-Takoradi, respectively. The paper further highlights how the two d...

Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2021

This study examines municipal solid waste (MSW) management systems in two cities in developing co... more This study examines municipal solid waste (MSW) management systems in two cities in developing countries at different phases of development: Sekondi-Takoradi, Ghana and Kocaeli, Turkey. The waste m...

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

Özet: Bu çalışmada bir gıda endüstrisi atıksuyunun alüminyum elektrot kullanılarak kesikli sistem... more Özet: Bu çalışmada bir gıda endüstrisi atıksuyunun alüminyum elektrot kullanılarak kesikli sistemde elektrokoagülasyon yöntemi ile arıtımı incelenmiştir. Anaerobik arıtma çıkışından alınan atıksuyun özellikleri 504 mg/L KOI, 100 mg/L TOK, 3.37 mS/cm iletkenlik ve 7.8 pH parametreleri ile karakterize edilmiştir. Elektrokoagülasyon prosesinin etkinliği KOİ parametresindeki değişim gözlenerek değerlendirilmiştir. Çalışmada pH, iletkenlik, akım yoğunluğu ve reaksiyon süresinin etkisi incelenmiştir. Elde edilen sonuçlardan optimum koşullar pH=7, iletkenlik=3.5 mS/cm, akım yoğunluğu =1.83 mA/cm 2 ve süre=30 dak. olarak belirlenmiştir. Bu koşullarda %95 KOİ giderim verimi elde edilirken işletme maliyeti de 0.98 TL/m 3 arıtılan atıksu olarak belirlenmiştir.

akademikpersonel.kocaeli.edu.tr

ABSTRACT: Municipal solid waste (MSW) baling is usualy used as a convenient method for temporary ... more ABSTRACT: Municipal solid waste (MSW) baling is usualy used as a convenient method for temporary storage in landfills. However, considerable environmental and safety problems may occur because of improper construction and handling. Therefore, MSW bales should ...

The aim of this work was to determine sorption-desorption behavior of atrazine in soil from Antal... more The aim of this work was to determine sorption-desorption behavior of atrazine in soil from Antalya, Turkey. Batch experiments were conducted to investigate the sorption isotherm and sorptiondesorption characteristics of atrazine. The sorption isotherm and kinetic studies showed that the sorption of atrazine was described by nonlinear and rate-limited processes for soil. Results indicate that organic matter content of soil has played major role on sorption behavior of atrazine (Kf= 3). Inorganic components could have contribution for influencing the sorption of atrazine. Results summarize that sorption of atrazine to calcareous soil with sandy loam texture was moderate which could lead to a possibility of contamination of groundwater resources. The results from the present study would also help in designing of effective herbicide management strategies in Antalya, Turkey. Key-Words: Antalya, atrazine, heterogeneous soils, isotherm, kinetic, sorption.

International Journal of Environmental Analytical Chemistry, 2021

Agricultural Waste and Residues, Aug 29, 2018

The potential for thermal recovery of waste is increasingly gaining impetus among researchers and... more The potential for thermal recovery of waste is increasingly gaining impetus among researchers and industries across the globe especially in many developed countries. However, in processing waste for energy recovery, the type and nature of input waste materials particularly those with high moisture content have a significant impact in determining the quality, environmental profile of the waste as well as the thermal properties of the final product. Bio-drying, as a waste to energy conversion technology, tends to reduce moisture content of waste while maintaining the energy content of the processed waste. The current study investigates the effect of input materials (biogenic and non-biogenic materials) on the energy and biogenic contents of waste material by bio-drying process. The results indicated a positive correlation between biogenic and energy contents of the input materials with some variations observed. Further analysis showed that, high proportion of food waste in the waste mix indicated a slight difference in biogenic and energy contents. Conversely, the same proportion of paper in the waste mix showed similar biogenic content with slight variation in energy content.

Water and Environment Journal

Effluents coming from potato chips manufacturing have high organic loads and require adequate tre... more Effluents coming from potato chips manufacturing have high organic loads and require adequate treatment before discharge to environment. In this study, O3/UV/H2O2 advanced oxidation process was applied to treat these wastewaters. With this aim, batch experiments were conducted in a reaction tank equipped with ozone injection and UV irradiation. Process variables were determined to be pH, ozone concentration, reaction time, H2O2 dosage and efficiency of the system was evaluated considering total organic carbon (TOC) removal. Central composite design technique was applied to examine the individual and synergetic effects of the experimental factors. A quadratic model was developed to maximize the TOC removal. Furthermore, operation costs were calculated for different experimental conditions and interactions between process variables and costs were analysed.

International Journal of …, 2008

Biologically produced hydrogen using biomass and mixed bacterial cultures is one approach to gene... more Biologically produced hydrogen using biomass and mixed bacterial cultures is one approach to generate renewable H 2 . Response surface methodology (RSM) was used to study the effect of initial pH (3.88–8.12) and initial substrate concentration (0.86–29.14 g/L) on both ...

Environmental Engineering and Management Journal

The aim of this study was to evaluate the results of an urban pilot project on separate collectio... more The aim of this study was to evaluate the results of an urban pilot project on separate collection of packaging wastes. The project has been performed in a developed and industrialized city of Turkey, Kocaeli with the aim of collecting packaging wastes generated in residents, public offices and other business offices. The project was carried out according to packaging waste management plans developed by sub-municipalities in coordination with Kocaeli Metropolitan Municipality. Total monthly collected packaging waste amounts have increased from 423.75 ton to 2891.16 ton during a 2-year period. Despite the increase in collected packaging waste amounts, collection efficiencies could not exceed 50% throughout the project. This can be explained by the absence of law enforcement in Packaging and Packaging Waste Control Act about separate collection of packaging wastes. The project was carried out by volunteers. Results of the study showed that collection efficiencies exhibited differences between the regions as a result of varying socioeconomic conditions, number of distributed collection equipments and intensity of educational activities. In the paper, impacts of various socioeconomic conditions and educational activities were also evaluated statistically by bivariate correlation analysis. Remarkable positive correlations were determined for the relationships between the quantity of distributed collection equipments and the collected packaging waste amounts. Educational activities were also found be effective with R 2 values higher than 0.60. Population density and educational status of the regions have exhibited lower positive correlations explained by R 2 values of 0.007 and 0.184.

Water, Air, & Soil Pollution

Water and Environment Journal

Water, Air, & Soil Pollution