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    Effective treatment of textile industry wastewater by combined ultraviolet assisted and Fe2+ catalyzed percarbonate oxidation
    (Taylor and Francis Ltd., 2024) Unal Yilmaz, Ezgi; Gundogdu, Hilal; Ersoz, Öykü Nur; Yokus, Senem; Türk, Oruç Kaan; Yazici Guvenc, Senem; Can-Güven, Emine
    Sustainable water management is very important for industries with high water consumption and wastewater generation, such as the textile industry. This study aims to investigate the treatment of textile wastewater with ultraviolet (UV) assisted and Fe2+ catalyzed sodium percarbonate (SPC) oxidation, which is an eco-friendly treatment method in terms of both added oxidant and activation methods. Based on the removal efficiencies and reaction rates, a sorting was made as UV/SPC/Fe2+ > SPC/Fe2+ > UV/Fe2+ > UV/SPC > SPC > UV. It was observed that the removal efficiencies increased as the SPC dose increased, and decreased due to the scavenging effect with the 5 g/L oxidant dose, and the optimum SPC dose was determined as 2.5 g/L. It was determined that the removal efficiencies were higher in acidic conditions and high UV power applications. Under optimum operating conditions (pH:3, SPC dose: 2.5 g/L, Fe2+ dose: 1 g/L, UV lamps: 4), 68% COD, 80.9% UV254, and 92% color removal were achieved. Under optimum conditions energy cost, chemical cost, and operational cost were calculated as 11.9 $/m3, 0.20 $/m3, and 12.1 $/m3, respectively. By reducing the process COD concentration to 236.2 mg/L, discharge standards have been achieved, and the applicability of the UV/SPC/Fe2+ process was proven. © 2023 Taylor & Francis Group, LLC.
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    Investigation of the active composition of products traded in local street bazaars for pest control
    (Refik Saydam National Public Health Agency (RSNPHA) turkhijyen@rshm.gov.tr, 2016) Can-Güven, Emine; Çil, Ahmet; Oğuz, Banu; Tezcan, Deniz; Gedik, Kadir; Kurt-Karakus, Perihan Binnur
    Objective: In this study, it was aimed to determine qualitatively the substances in the composition of biocidal products and plant protection sold in public areas with reference to current use of prohibited pesticides detected in toxicological studies conducted in Antalya province. Methods: A total of 19 samples sold under the name of DDT, insecticide, termiticide were gathered from public markets, illegal suppliers and districts where agricultural activities take place in Antalya province. To identify ingredients of products, after 100 mg of each was weighed and dissolved in 10 ml methanol, it was diluted with isooctane, and tested to instrumental analysis on a Gas Chromatography-Mass Spectrometry (Shimadzu QP2010 Ultra). Chromatograms gathered from scan mode were matched with the content of Wiley/NIST which has a comprehensive pesticide library. Results: AAs a result of qualitative evaluation, it was observed that dichlorvos, aldicarb and cypermethrin as well as Dursban whose active ingredient is chlorpyrifosethyl in the samples. In addition to these active ingredients, inactive ingredients (extender) such as sebacic acid, mercaptane, propionic acid were detected at varying ratios in the samples. While chlorpyrifos-ethyl was mostly detected in 31.6% of the active content available, sebacic acid (47.4%) was mostly detected as extender ingredient as well. Conclusion: It has been observed that there are materials that are classified as carcinogenic by USEPA and may pose a threat to human health in the content of some of the products analyzed, or that the products which do not contain any active ingredient affecting incect pests have been used in commercial activities away from control and supervision. It is considered that the unconscious implementation of such products by persons with insufficient knowledge may constitute a serious risk in terms of both user and environment.