Solid waste management is very important topic for solid waste related people and intitutions all... more Solid waste management is very important topic for solid waste related people and intitutions all over the world. In the modern solid waste systems there are vocational education programs (VET) for target groups which uses new method and technologies. Unfortunately, neither decision makers nor solid waste related people have enough source about this new technological developments, so still traditional methods are using in the solid waste management area. Waste-Train (Vocational Training, Education, Conveying Information on up-to-date Waste Management Practices to Decision Makers/Staff involved in Waste Management) project which supported by the Leonardo Da Vinci Educational Projects of the Europe Union, aims teaching solid waste management and new technologies to the decision makers and workers who works solid waste related topics. 12 institutions from 8 different European countries are partners of the project.
In order to reach the ultimate goal of a prosperous human-centered society, new approaches in ind... more In order to reach the ultimate goal of a prosperous human-centered society, new approaches in industrialization are being conceptualized, discussed or put into action in different parts of the world. However, industrial development and progress still depend heavily on limited natural resources such as water, minerals and fuels. A simple database search shows that interest of academia on concepts of recycling and reuse has doubled in the last 5 years, with a consistent increase since 2001. Research mainly includes but is not limited to reusing and recycling of lithium ion batteries in order to recover lithium, greywater for sustainable water management specifically at urban areas, rare earth elements, solid waste and industrial wastewater. Valorization of industrial wastewater for closing the on-site water cycle and recovery of resources including minerals and energy has been the focus of researchers and policy-makers alike, in the last decade. Apart from more conventional treatment approaches such as electrocoagulation, membrane filtration, and advanced oxidation, nanotechnology-based techniques have recently begun drawing attention.
The synergistic effects of titanium dioxide photocatalysis in combination with Fenton-like reacti... more The synergistic effects of titanium dioxide photocatalysis in combination with Fenton-like reactions for photoelectrochemical based hydrogen production and wastewater treatment is investigated in a newly designed photoelectrochemical reactor. Here, titanium dioxide nanoparticles are coated on the anode to enhance both hydrogen production and wastewater treatment processes. The reactor is tested under 600 W/m 2 of solar irradiance and is characterized using electrochemical, chemical oxygen demand, absorbance, and ultraviolet-visible absorption spectroscopy techniques. The results show that the oxygen evaluation in the anolyte is substituted by iron(II)/iron(III) ions and the presence of hydrogen peroxide forms up the hydroxyl radicals via Fenton like process for degradation of organics in wastewater. While, hydrogen gas production in the catholyte is improved up to 8% by the means of proton reduction at the cathode in an acid medium. Also, 33% chemical oxygen demand removal efficiency of the synthetic textile wastewater (Reactive Black 5) is recorded in 17 h. This new hybrid configuration combines three different photo-assisted advanced oxidation processes such as ultraviolet/ Fenton, ultraviolet/titanium dioxide, and ultraviolet/hydrogen peroxide with electrolysis process which increases hydrogen gas production rate and treats the wastewater.
... bromate formation potential of BC rawwater and to optimize ozone and coagulation processes fo... more ... bromate formation potential of BC rawwater and to optimize ozone and coagulation processes for bromate control in bromide-containing BC surface water. ... ozonated BC water.Keywords: Bromate formation; Bromide levels; Coagulation; Istanbul drinking water ...
Natural organic matter removal (NOM) efficiencies of samples from three major drinking water sour... more Natural organic matter removal (NOM) efficiencies of samples from three major drinking water sources (Elmali, Omerli, and Buyukcekmece) of Istanbul were compared using different treatment systems. Enhanced coagulation as a physico‐chemical method was applied using ferric chloride and aluminum sulphate as the coagulating agents. Moreover, the application of enhanced coagulation in combination with photocatalytic oxidation using TiO2 was investigated. The
Cu 2 O@TiO 2 heterojunction nanocomposites were prepared via ultrasonic method towards the remova... more Cu 2 O@TiO 2 heterojunction nanocomposites were prepared via ultrasonic method towards the removal of the environmental pollutant of MO by the visible light photocatalytic approach. The structure of prepared Cu 2 O@TiO 2 heterojunction nanocomposites was analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, transmission electron microscope, photoluminescence spectroscopy, UV-Visible absorption spectroscopy, diffused reflectance spectroscopy. The photocatalytic degradation ability was tested using methyl orange as a model pollutant. From the observed pseudo-first order reaction, it was clear that Cu 2 O@TiO 2 nanocomposites showed enhanced photocatalytic activity (rate = 0.223 sec-1). The formation of demethylated methyl orange as an intermediate was identified from HPLC analysis at a retention time of 3.47 min. When doped with Cu 2 O, the TiO 2 preserved the integrity of its structural, revealing the morphology there is no significant changes have been made, favoring photoelectrochemical appliances. In presence of illumination, the photocurrent of Cu 2 O@TiO 2 was 4.5 folds greater than that of TiO 2 , involving that incorporating with Cu 2 O extensively enhanced mobility of electron via reducing the recombination rate of electron-hole pairs.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The control of natural organic matter (NOM) in drinking water treatment plants is required in ord... more The control of natural organic matter (NOM) in drinking water treatment plants is required in order to control (i) the formation of potentially harmful disinfection byproducts (DBPs), (ii) the regrowth of bacteria and (iii) pipe corrosion in the distribution system. Photocatalysis is a promising advanced oxidation technology due to its ability to mineralise chlorinated byproduct precursors such as humic acids (HAs) to carbon dioxide and water. In this study, the efficiency of HAs and NOM removal in terms of UV absorbance at 254 nm (UV 254) was tested by means of a new photocatalytic reactor made of stacked polymethylmethacrylate (PMMA) rings coated by TiO 2 nanofilm. Three different sets of rings were coated with TiO 2 gel one, two and three times respectively to optimise the coating thickness according to UV 254 removal efficiency. The titania sol was immobilised on the substrate by a low temperature procedure and after 8 months the reactors were reactivated by means of UV radiation before the experiments. The photocatalytic removal efficiency of humic acid in terms of UV 254 was significantly higher after 1 hour for the reactor employed with high thickness TiO 2 nanofilm (around 20%) compared to middle and low thickness reactors (6 and 1.4%, respectively). However, during the same reaction time only 10% of UV 254 was removed with high thickness TiO 2 nanofilm using raw surface water, probably owing to ionic species naturally occurring in the raw water sample. Finally, the activation of the TiO 2 nanofilm may be effectively accomplished by means of UV radiation where calcination cannot be applied (e.g. thermally sensitive substrates).
In this study, disinfection and formation of disinfection by-products (DBPs) were studied in a ph... more In this study, disinfection and formation of disinfection by-products (DBPs) were studied in a photoelectrocatalytic (PEC) treatment system. Disinfection performance of titanium dioxide (TiO 2) in the PEC system was determined through Escherichia coli (E. coli) inactivation. Humic acid (HA) was used as a model organic compound and its removal was monitored by total organic carbon (TOC) measurements using 410 nm (color) and 254 nm (UV 254) wavelengths. Trihalomethanes (THMs) were measured for the evaluation of DBPs formation during PEC treatment of chloride and HA mixture. It was found that unlike photocatalytic treatment, THMs might form in the PEC system. To investigate the effects of anions on the PEC treatment, chloride (Cl À), sulfate (SO 4 2À), phosphoric acid (H 2 PO 4 À)/hydrogen phosphate (HPO 4 2À) and bicarbonate (HCO 3 À) ions were added separately to the HA and bacterial suspensions. Presence of H 2 PO 4 À /HPO 4 2À and HCO 3 À ions resulted in inhibitory effects on both HA degradation and E. coli inactivation, which were also examined in the photoanode. It was observed that the presence of HA had a strong inhibitory effect on the disinfection of E. coli.
International Journal of Hydrogen Energy, Jul 1, 2018
The aim of this research is to investigate the performance and the dynamic thermo-fluid behaviour... more The aim of this research is to investigate the performance and the dynamic thermo-fluid behaviour of a new vacuum spray flash desalinator. This is the key component of the open water cycle in the discharge thermal energy combined desalination (DTECD) system utilising a gas-liquid ejector (eductor). A downflow eductor using saline water as a motive fluid is proposed for this new single-stage vacuum desalinator. The effects of the temperature and the salinity of motive fluid on the performance of eductor are investigated. The exergy efficiency of the system and its components are evaluated. Experimental results indicate that the performance of the proposed desalinator aligns well with the evaporation model. The proposed eductor is also reliable and easy to operate for generating a vacuum as required close to 6 kPa. This pressure is lower than the corresponding saturation pressures of the operating temperature range between 55 C and 75 C. The results show that lower vacuum pressure is obtained when the temperature of the motive fluid is lower (about 30 C or less). The eductor was operated using 3% and 3.5% by weight of saline water and the results show that the salinity of the motive fluid does not significantly affect the performance of the system. Thus, utilising seawater can be an alternative and cheap option for operating the eductor.
In the study, sol-gel based TiO2 nanoparticles (NPs) were doped by Cu(II), and the surface of cot... more In the study, sol-gel based TiO2 nanoparticles (NPs) were doped by Cu(II), and the surface of cotton fabric was coated with Cu-doped TiO2 NPs to develop self-cleaning and antibacterial properties. Coffee stains were introduced on the modified cotton fabric and under suntest illumination; a decrease in the color of coffee stain was followed over time via K/S value to determine self-cleaning performance. The photocurrent in a photoelectrocatalytic reactor was measured to evaluate the photocatalytic effect of Cu(II) doping. TiO2 NPs showed self-cleaning and antibacterial effects under UV-illuminated conditions. However, no effects were observed under dark (non-illuminated) conditions. The modified textiles with Cu(II) doped TiO2 NPs showed antibacterial activity against E. coli under light and dark conditions. Under the 2 h illumination period, fluctuating color changes were observed on the raw cotton fabric, and stains remained on the fabric while 78% and 100% color removals were achieved in the cotton fabrics coated by Cu doped TiO2 NPs in 1 h and 2 h, respectively.
International Journal of Hydrogen Energy, Sep 1, 2019
h i g h l i g h t s Investigation of synergistic effects of AOPs for H 2 production and wastewate... more h i g h l i g h t s Investigation of synergistic effects of AOPs for H 2 production and wastewater treatment processes. TiO 2 NPs utilization in combination with Fenton reactions for wastewater treatment. Wastewater treatment systems with simultaneous hydrogen production.
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Solid waste management is very important topic for solid waste related people and intitutions all... more Solid waste management is very important topic for solid waste related people and intitutions all over the world. In the modern solid waste systems there are vocational education programs (VET) for target groups which uses new method and technologies. Unfortunately, neither decision makers nor solid waste related people have enough source about this new technological developments, so still traditional methods are using in the solid waste management area. Waste-Train (Vocational Training, Education, Conveying Information on up-to-date Waste Management Practices to Decision Makers/Staff involved in Waste Management) project which supported by the Leonardo Da Vinci Educational Projects of the Europe Union, aims teaching solid waste management and new technologies to the decision makers and workers who works solid waste related topics. 12 institutions from 8 different European countries are partners of the project.
In order to reach the ultimate goal of a prosperous human-centered society, new approaches in ind... more In order to reach the ultimate goal of a prosperous human-centered society, new approaches in industrialization are being conceptualized, discussed or put into action in different parts of the world. However, industrial development and progress still depend heavily on limited natural resources such as water, minerals and fuels. A simple database search shows that interest of academia on concepts of recycling and reuse has doubled in the last 5 years, with a consistent increase since 2001. Research mainly includes but is not limited to reusing and recycling of lithium ion batteries in order to recover lithium, greywater for sustainable water management specifically at urban areas, rare earth elements, solid waste and industrial wastewater. Valorization of industrial wastewater for closing the on-site water cycle and recovery of resources including minerals and energy has been the focus of researchers and policy-makers alike, in the last decade. Apart from more conventional treatment approaches such as electrocoagulation, membrane filtration, and advanced oxidation, nanotechnology-based techniques have recently begun drawing attention.
The synergistic effects of titanium dioxide photocatalysis in combination with Fenton-like reacti... more The synergistic effects of titanium dioxide photocatalysis in combination with Fenton-like reactions for photoelectrochemical based hydrogen production and wastewater treatment is investigated in a newly designed photoelectrochemical reactor. Here, titanium dioxide nanoparticles are coated on the anode to enhance both hydrogen production and wastewater treatment processes. The reactor is tested under 600 W/m 2 of solar irradiance and is characterized using electrochemical, chemical oxygen demand, absorbance, and ultraviolet-visible absorption spectroscopy techniques. The results show that the oxygen evaluation in the anolyte is substituted by iron(II)/iron(III) ions and the presence of hydrogen peroxide forms up the hydroxyl radicals via Fenton like process for degradation of organics in wastewater. While, hydrogen gas production in the catholyte is improved up to 8% by the means of proton reduction at the cathode in an acid medium. Also, 33% chemical oxygen demand removal efficiency of the synthetic textile wastewater (Reactive Black 5) is recorded in 17 h. This new hybrid configuration combines three different photo-assisted advanced oxidation processes such as ultraviolet/ Fenton, ultraviolet/titanium dioxide, and ultraviolet/hydrogen peroxide with electrolysis process which increases hydrogen gas production rate and treats the wastewater.
... bromate formation potential of BC rawwater and to optimize ozone and coagulation processes fo... more ... bromate formation potential of BC rawwater and to optimize ozone and coagulation processes for bromate control in bromide-containing BC surface water. ... ozonated BC water.Keywords: Bromate formation; Bromide levels; Coagulation; Istanbul drinking water ...
Natural organic matter removal (NOM) efficiencies of samples from three major drinking water sour... more Natural organic matter removal (NOM) efficiencies of samples from three major drinking water sources (Elmali, Omerli, and Buyukcekmece) of Istanbul were compared using different treatment systems. Enhanced coagulation as a physico‐chemical method was applied using ferric chloride and aluminum sulphate as the coagulating agents. Moreover, the application of enhanced coagulation in combination with photocatalytic oxidation using TiO2 was investigated. The
Cu 2 O@TiO 2 heterojunction nanocomposites were prepared via ultrasonic method towards the remova... more Cu 2 O@TiO 2 heterojunction nanocomposites were prepared via ultrasonic method towards the removal of the environmental pollutant of MO by the visible light photocatalytic approach. The structure of prepared Cu 2 O@TiO 2 heterojunction nanocomposites was analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, transmission electron microscope, photoluminescence spectroscopy, UV-Visible absorption spectroscopy, diffused reflectance spectroscopy. The photocatalytic degradation ability was tested using methyl orange as a model pollutant. From the observed pseudo-first order reaction, it was clear that Cu 2 O@TiO 2 nanocomposites showed enhanced photocatalytic activity (rate = 0.223 sec-1). The formation of demethylated methyl orange as an intermediate was identified from HPLC analysis at a retention time of 3.47 min. When doped with Cu 2 O, the TiO 2 preserved the integrity of its structural, revealing the morphology there is no significant changes have been made, favoring photoelectrochemical appliances. In presence of illumination, the photocurrent of Cu 2 O@TiO 2 was 4.5 folds greater than that of TiO 2 , involving that incorporating with Cu 2 O extensively enhanced mobility of electron via reducing the recombination rate of electron-hole pairs.
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
The control of natural organic matter (NOM) in drinking water treatment plants is required in ord... more The control of natural organic matter (NOM) in drinking water treatment plants is required in order to control (i) the formation of potentially harmful disinfection byproducts (DBPs), (ii) the regrowth of bacteria and (iii) pipe corrosion in the distribution system. Photocatalysis is a promising advanced oxidation technology due to its ability to mineralise chlorinated byproduct precursors such as humic acids (HAs) to carbon dioxide and water. In this study, the efficiency of HAs and NOM removal in terms of UV absorbance at 254 nm (UV 254) was tested by means of a new photocatalytic reactor made of stacked polymethylmethacrylate (PMMA) rings coated by TiO 2 nanofilm. Three different sets of rings were coated with TiO 2 gel one, two and three times respectively to optimise the coating thickness according to UV 254 removal efficiency. The titania sol was immobilised on the substrate by a low temperature procedure and after 8 months the reactors were reactivated by means of UV radiation before the experiments. The photocatalytic removal efficiency of humic acid in terms of UV 254 was significantly higher after 1 hour for the reactor employed with high thickness TiO 2 nanofilm (around 20%) compared to middle and low thickness reactors (6 and 1.4%, respectively). However, during the same reaction time only 10% of UV 254 was removed with high thickness TiO 2 nanofilm using raw surface water, probably owing to ionic species naturally occurring in the raw water sample. Finally, the activation of the TiO 2 nanofilm may be effectively accomplished by means of UV radiation where calcination cannot be applied (e.g. thermally sensitive substrates).
In this study, disinfection and formation of disinfection by-products (DBPs) were studied in a ph... more In this study, disinfection and formation of disinfection by-products (DBPs) were studied in a photoelectrocatalytic (PEC) treatment system. Disinfection performance of titanium dioxide (TiO 2) in the PEC system was determined through Escherichia coli (E. coli) inactivation. Humic acid (HA) was used as a model organic compound and its removal was monitored by total organic carbon (TOC) measurements using 410 nm (color) and 254 nm (UV 254) wavelengths. Trihalomethanes (THMs) were measured for the evaluation of DBPs formation during PEC treatment of chloride and HA mixture. It was found that unlike photocatalytic treatment, THMs might form in the PEC system. To investigate the effects of anions on the PEC treatment, chloride (Cl À), sulfate (SO 4 2À), phosphoric acid (H 2 PO 4 À)/hydrogen phosphate (HPO 4 2À) and bicarbonate (HCO 3 À) ions were added separately to the HA and bacterial suspensions. Presence of H 2 PO 4 À /HPO 4 2À and HCO 3 À ions resulted in inhibitory effects on both HA degradation and E. coli inactivation, which were also examined in the photoanode. It was observed that the presence of HA had a strong inhibitory effect on the disinfection of E. coli.
International Journal of Hydrogen Energy, Jul 1, 2018
The aim of this research is to investigate the performance and the dynamic thermo-fluid behaviour... more The aim of this research is to investigate the performance and the dynamic thermo-fluid behaviour of a new vacuum spray flash desalinator. This is the key component of the open water cycle in the discharge thermal energy combined desalination (DTECD) system utilising a gas-liquid ejector (eductor). A downflow eductor using saline water as a motive fluid is proposed for this new single-stage vacuum desalinator. The effects of the temperature and the salinity of motive fluid on the performance of eductor are investigated. The exergy efficiency of the system and its components are evaluated. Experimental results indicate that the performance of the proposed desalinator aligns well with the evaporation model. The proposed eductor is also reliable and easy to operate for generating a vacuum as required close to 6 kPa. This pressure is lower than the corresponding saturation pressures of the operating temperature range between 55 C and 75 C. The results show that lower vacuum pressure is obtained when the temperature of the motive fluid is lower (about 30 C or less). The eductor was operated using 3% and 3.5% by weight of saline water and the results show that the salinity of the motive fluid does not significantly affect the performance of the system. Thus, utilising seawater can be an alternative and cheap option for operating the eductor.
In the study, sol-gel based TiO2 nanoparticles (NPs) were doped by Cu(II), and the surface of cot... more In the study, sol-gel based TiO2 nanoparticles (NPs) were doped by Cu(II), and the surface of cotton fabric was coated with Cu-doped TiO2 NPs to develop self-cleaning and antibacterial properties. Coffee stains were introduced on the modified cotton fabric and under suntest illumination; a decrease in the color of coffee stain was followed over time via K/S value to determine self-cleaning performance. The photocurrent in a photoelectrocatalytic reactor was measured to evaluate the photocatalytic effect of Cu(II) doping. TiO2 NPs showed self-cleaning and antibacterial effects under UV-illuminated conditions. However, no effects were observed under dark (non-illuminated) conditions. The modified textiles with Cu(II) doped TiO2 NPs showed antibacterial activity against E. coli under light and dark conditions. Under the 2 h illumination period, fluctuating color changes were observed on the raw cotton fabric, and stains remained on the fabric while 78% and 100% color removals were achieved in the cotton fabrics coated by Cu doped TiO2 NPs in 1 h and 2 h, respectively.
International Journal of Hydrogen Energy, Sep 1, 2019
h i g h l i g h t s Investigation of synergistic effects of AOPs for H 2 production and wastewate... more h i g h l i g h t s Investigation of synergistic effects of AOPs for H 2 production and wastewater treatment processes. TiO 2 NPs utilization in combination with Fenton reactions for wastewater treatment. Wastewater treatment systems with simultaneous hydrogen production.
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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