Yazar "Ciner, Fehiman" seçeneğine göre listele

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    A guide to theory and practice of drinking water: PURE-H2O approaches
    (Yildiz Technical University, 2019) Dogan-Saglamtimur, Neslihan; Ciner, Fehiman
    The quality of drinking water that is essential for life is a powerful environmental determinant of health. Engineering works in all fields have been constructed to distribute water from places of abundance to places in need. All water sources contain suspended and particulate inorganic/organic substances that must be dispelled during water treatment process to yield pure water that is fit for drinking and any other usage. Treatment procedures should be chosen in order to improve water stability. Many treatment processes (sometimes called unit processes and unit operations) are linked together to form a treatment plant in order to produce water of the desired quality. Unit operations, which are physical and chemical (aeration, adsorption, membrane processes, ion exchange, coagulation and flocculation, chemical oxidation and water softening) and mechanical (sedimentation and filtration) should be taken into consideration for producing clean drinking water. Choosing the suitable treatment process is a critical step in the procurement of safe, reliable, high quality drinking water at a cost-effective price for green/sustainable engineering. As a main part of the EU Project titled as "Implementation of ECVET for Qualification Design in Drinking Water Treatment Plants and Sanitation for Pure Drinkable Water-PUREH2O" that includes environmental planning, training in the field of drinking water, sustainable development, sound practices not only in the field of drinking water but also affiliated treatment facilities, this study focuses on selection of the water source, unit operations for drinking water and choosing water treatment processes. © 2019 Yildiz Technical University. All rights reserved.
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    A multifaceted aggregation and toxicity assessment study of sol-gel-based TiO2 nanoparticles during textile wastewater treatment
    (DESALINATION PUBL, 2016) Yuzer, Burak; Guida, Marco; Ciner, Fehiman; Aktan, Burcu; Aydin, M. Iberia; Meric, Sureyya; Selcuk, Huseyin
    Innovative textiles have been concern of emerging risk of nanoparticles (NPs) to human and environment. This study aimed to investigate the aggregation, removal and biological, and ecotoxicological effects of sol-gel-based TiO2 NPs while the treatment of textile wastewater. Fe(II) and alum coagulants were applied for the removal of spiked TiO2 NPs from textile wastewater. Particle size distribution, absorbance values (UV-vis range), and residual TiO2 NPs were followed to define aggregation mechanism, including pH variation during treatment of wastewater. The effect of TiO2 on activated sludge treatment was followed by monitoring of oxygen uptake rate (OUR). Ecotoxicity of sol-gel and coagulated samples was observed by Ceriodaphnia magna immobilization test. Adjustment of pH to 8 enlarged mean particle size distribution of sol-gel-based TiO2 NPs from 30 to 450nm. After alum and Fe(II) coagulations, average particle size distributions were observed to be 650 and 960nm, respectively. Coagulation with alum and Fe(II) resulted over >95% removal of TiO2 from biologically treated textile wastewater (BTTWW). The value for residual TiO2 concentration in BTTWW was reduced from 120g/L to around 8g/L TiO2 NPs exhibited slight/no toxicity on the OUR while toxicity to Ceriodaphnia dubia increased in some coagulated samples, most probably due to higher residual coagulant concentrations.
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    Circular Economy for Water
    (Mehmet Sinan Bilgili, 2020) Ciner, Fehiman; Dogan-Saglamtimur, Neslihan
    One of the most ubiquitous problems affecting people throughout the world is insufficient access to clean water that is essential for meeting basic needs of all living things. Global economy and population make water a limited resource. Additionally, the ongoing Covid-19 pandemic is causing severe stress to society, with direct implications for public health and public water services. Reclaimed water reuse is currently applied in many countries. However, the proportion of water reuse in total wastewater generation is still inadequate. Circular economy concept could generate remarkable synergies for the wide adoption of water reuse as an alternative for water supply. From a circular economy viewpoint, water reuse is a win-win option. This study addresses circular economy for water and its principles, opportunities and applications to water system management.
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    Investigation of inhibition effects of different sol-gel based TiO2 nanoparticles on activated sludge and toxicity to Daphnia magna
    (Desalination Publ, 2019) Yuzer, Burak; Ciner, Fehiman; Calhan, Rahman; Selcuk, Huseyin; Meric, Sureyya
    The application of nanotechnology in textile products is progressively increasing as it is proving to be a useful tool in improving the performance of textiles. Titanium dioxide (TiO2) nanoparticles (NPs) have been the most studied ones to develop self-cleaning and anti-bacterial nano textiles. However, the adverse effects of NPs and the risk of the possible release of NPs into the wastewater process and then in receiving waters, thus ecotoxicity studies need to be performed for the safeguard of the environment. Monitoring oxygen uptake rate (OUR) has been demonstrated to be are a liable method to show any inhibition response of the activated sludge. Hence this study was performed to investigate the ecotoxicity and inhibition effects of NPs to Daphnia magna and activated sludge comparatively. Activated sludge inhibition tests were conducted to define the EC50 levels after 30 and 180 min of reaction time for TiO2 NPs, Ag-doped TiO2 NPs, and Cu-doped TiO2 NPs while Daphnia magna immobilization test was carried out for TiO2 NPs prepared by Degussa P25 and sol-gel method. The Ag-doped TiO2 NPs exhibited a toxic effect on the activated sludge 10 times higher than the TiO2 NPs.TiO2 NPs prepared by the sol-gel method caused 100% immobilization to Daphnia magna when exposed to 1 h settled sample after 48 h, and this severe toxicity repeated in the 2 h settled sample too. As a whole, the results obtained indicate that the technology should be accurately evaluated for the safety of the environment and human beings.
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    Treatability of Dye Solutions Containing Disperse Dyes by Fenton and Fenton-Solar Light Oxidation Processes
    (WILEY-BLACKWELL, 2013) Ciner, Fehiman; Gokkus, Omur
    This study attempts to explore the possibility of treating dye solutions containing Disperse Yellow 119 and Disperse Red 167 by Fenton and Fenton under solar-light oxidation processes. Experiments were conducted to examine the effects of various operating conditions on the performance of the treatment systems. The Fenton results showed that 98.6% spectral absorption coefficient (SAC) and 90.8% chemical oxygen demand (COD) removals were proved at pH 3, 50?mg/L Fe2+, and 75?mg/L H2O2, 15?min oxidation time for Disperse Yellow 119. After 40?min solar irradiation time during Fenton process the SAC removal was 99.1%. COD reduction of about 98.3% was observed at the same time. It was also obtained as 97.8% SAC and 97.7% COD removal with pH 3, 75?mg/L Fe2+, 100?mg/L H2O2, and 25?min oxidation time for Disperse Red 167 at this optimum conditions. For Disperse Red 167 during Fenton under solar light process, after 40?min of solar irradiation time the SAC and COD reduction were obtained 99.3 and 98.4%, respectively.