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    COMPARISON OF TREATMENT OF TEXTILE WASTEWATER WITH ADSORPTION PROCESS, SULFATE AND HYDROXYL RADICAL-BASED OXIDATION PROCESSES
    (Gheorghe Asachi Technical University of Iasi, Romania, 2023) Çifçi, Deniz Izlen; Güneş, Elçin; Güneş, Yalçin
    In this study, the treatment of textile wastewater by adsorption, sulfate radical-based oxidation (UV/S2O8), and hydroxyl radical-based (UV/H2O2) oxidation methods was investigated. The effects of pH and Powdered Activated Carbon (PAC) dose on the adsorption process were assessed, and advanced oxidation processes by UV/S2O8and UV/H2O2in wastewater after the adsorption were also investigated. In addition, the treatment of textile wastewater by UV/S2O8and UV/H2O2oxidation processes as a single process was examined and optimum pH and oxidant dose were determined in these treatments. In the adsorption process, 81.3% Chemical Oxygen Demand (COD), 83.6% Total Organic Carbon (TOC) and 97.0% color removal were achieved at pH 5 and 20 g/L PAC dose. In addition, 98% COD and 94% TOC removal has been achieved with UV/S2O8or UV/H2O2oxidation processes after adsorption. While 76% COD removal can be achieved with UV/S2O8as a single process, COD removal can increase to 90% in the UV/H2O2oxidation as a single process. As a result, COD and TOC removal with UV/S2O8or UV/H2O2processes increased if applied after the adsorption process. According to the results of this study, these methods seem to be promising in terms of recycling and reuse of textile wastewater. However, there is a need to investigate the removal of other pollutants expresses as Total Dissolved Solids (TDS), or salts for water recovery and reuse. © 2023 Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.
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    TREATMENT OF A TEXTILE WASTEWATER USING SULFATE AND HYDROXYL RADICALS BASED OXIDATION UNDER THE UV LIGHT: A COMPARISON BETWEEN UV/H2O2, UV/PS AND UV/PMS
    (Gheorghe Asachi Technical University of Iasi, Romania, 2023) Çifçi, Deniz Izlen; Şensoy, Özlem; Güneş, Elçin; Güneş, Yalçin
    In this study, chemical oxygen demand (COD), total organic carbon (TOC) and color removal efficiencies and treatment costs were compared with three different oxidation processes using hydroxyl or sulfate radicals in a textile wastewater. UV/H2O2process was used to obtain hydroxyl radicals, UV/PS and UV/PMS were used to obtain sulfate radicals. Optimum catalyst concentrations and optimum pH values were determined for all three processes by investigating COD, TOC and color removal efficiencies. According to the results, the highest removal efficiencies were obtained under the optimal conditions of pH: 7 in UV/PS oxidation, pH: 8 in UV/PMS oxidation, and pH 4 in UV/H2O2oxidation. The COD, TOC and color removal efficiencies were obtained as 85.5%, 65.7% and 99.0% in UV/PS oxidation (COD/PS: 1/5, pH: 7) and 81.8%, 70.3% and 96.7% in UV/H2O2oxidation (H2O2: 1750 mg/L, pH: 4), respectively. The COD, TOC and color removal efficiencies were 65.9%, 37.3% and 98.8% in UV/PMS oxidation (COD/PMS: 1/10, pH 8), respectively. UV/PMS oxidation was sufficient in terms of color removal, but not satisfactory in terms of organic matter removal. The order of performance of the processes was as follows: UV/PS>UV/H2O2>UV/PMS. The ranking according to total cost was as follows: UV/PS