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    Chemical industry wastewater treatment by coagulation combined with Fenton and photo-Fenton processes
    (Wiley, 2023) Metin, Seda; Çifci, Deniz İzlen
    BACKGROUND Chemical industry wastewater is challenging to treat because of the various chemicals they contain. In this study, the treatment of chemical industry wastewater, which produces a wide variety of chemical aids, such as foam control agents, and silicones used in the textile, food and cosmetics industries, by coagulation combined with Fenton or photo-Fenton oxidation processes was investigated. In coagulation studies, optimum pH and coagulant dose were determined with polyaluminum chloride (PAC), polyaluminum chloride hydroxide sulfate (PACS) and FeCl3 coagulants, while Fe2+, H2O2, pH and oxidation time were optimized in Fenton studies.RESULTS In the coagulation, higher wastewater treatment was achieved with PAC compared to PACS and FeCl3 coagulants, and 62.6% chemical oxygen demand (COD) and 44.3% total organic carbon (TOC) removal were obtained at 500 mg L-1 PAC and pH 8. In the coagulation and Fenton oxidation, 92.4% COD, 79.7% TOC, 99.8% turbidity, and 96.7% total soluble solids (TSS) were achieved. The application of photo-Fenton oxidation instead of Fenton oxidation did not cause a significant change in chemical industry wastewater. The cost of chemical industry wastewater treatment by coagulation and Fenton oxidation was calculated as $19.16 m(-3), and the cost per kilogram of CODremoved was determined as $2.89 kg(-1).CONCLUSION In chemical industry wastewater treatment, high TSS and turbidity removal can be achieved by coagulation with PAC, and the wastewater load subjected to Fenton oxidation can be reduced. Efficient wastewater treatment was provided by Fenton oxidation after coagulation. The application of the photo-Fenton oxidation process instead of Fenton oxidation did not show the expected effect. However, toxicity studies should be performed in treated wastewater using coagulation-Fenton oxidation processes in future studies.
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    Comparison of Conventional and Ultrasonic-Assisted Adsorption Processes by Using H3PO4 Activated Cypress Tree Cone for Methylene Blue Removal (vol 44, pg 269, 2022)
    (Pleiades Publishing Inc, 2022) Aydın, Nesli; Çifci, Deniz İzlen
    [Abstract Not Available]
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    EXPLORING THE EFFECT OF COVID-19 ON MUNICIPAL WASTE GENERATION WITH SYSTEM DYNAMICS MODELLING
    (Gh Asachi Technical Univ Iasi, 2022) Aydın, Nesli; Çifci, Deniz İzlen
    This study examines the dynamic change in population and municipal waste generation during the COVID-19 pandemic. A stockflow infection modelling was used to link population dynamics with disease transmission parameters (such as probability to catch COVID-19 and population interactions) to estimate municipal waste generation in the province of Tekirdag, Turkey. Three different scenarios (Scenario 1: severe conditions with possible mutation of coronavirus, Scenario 2: moderate conditions with the continuation of the current case and Scenario 3: mild conditions with intensified vaccination) were produced and simulation results were analysed. The results show that it is expected to have a peak with 230 000 people with severe symptoms in Scenario 1. It is also expected to have 1 person/week to pass away due to inadequate health infrastructure if the annual healthcare capacity improvement rate in the province remains at its current rate (1%). The results indicate that the amount of dry recyclables increases over time in the three scenarios. However, in Scenario 3, a total of 450 000 - 780 000 tonnes of dry recyclables are expected to be produced at the end of 3 years. This high amount of waste is likely to cause dynamism in the recycling activities of the province. As far as it is concerned that 750 000 - 1 000 000 tonnes of residual waste (including used masks) are expected to be produced in Scenario 3, capacity improvement for the only landfill site of the province should be made urgently or an alternative solid waste disposal facility should be put into use to meet this need.
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    Exploring the reusability of cuttlefish bones in sustainable waste management by green synthesis method for methylene blue dye removal
    (Taylor and Francis Ltd., 2023) Çifci, Deniz İzlen; Aydın, Neşli
    The use of solid wastes as an adsorbent for dye removal from wastewater is one of the leading steps of sustainable waste management. In this research, the removal of Methylene Blue dye by cuttlefish bone waste was examined by using peppermint extract. Zn-doped cuttlefish bone was prepared by the green synthesis method in laboratory conditions for the comparison of cuttlefish bone in adsorption and ultrasonically-assisted adsorption processes. The results of this study exhibited that Methylene Blue removal with Zn-doped cuttlefish bone was higher than that with cuttlefish bone at all pH values. The qmax values obtained from the Langmuir isotherm model were calculated as 8.96 mg/g and 12.74 mg/g in the adsorption process with cuttlefish bone and Zn-doped cuttlefish bone, respectively. The qmax value relatively improved to 18.05 mg/g in the ultrasonically-assisted adsorption with Zn-doped cuttlefish bone. With the green synthesis, the qmax increased by 1.42 times, while this increase was 2.01 times with the application of the ultrasonically-assisted adsorption process using Zn-doped cuttlefish bone compared to the adsorption process using cuttlefish bone. © 2023 Informa UK Limited, trading as Taylor & Francis Group.
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    Fe-Mn-textile waste synthesis for COD and color removal from textile wastewater by UV/S2O82- oxidation
    (Springer, 2023) Çifci, Deniz İzlen
    In this study, Fe-Mn-textile waste material was synthesized from textile waste and the usability for COD and color removal from biologically treated textile wastewater was investigated by S2O82- oxidation process. The prepared Fe-Mn-textile waste was characterized by SEM-EDX and FTIR analysis, and it contains 0.87 +/- 0.03% Fe and 0.42 +/- 0.02% Mn. In the study, persulfate oxidation was carried out at different concentrations of S2O82- and Fe-Mn-textile waste. 51.2% COD and 94.2% color removal was observed at 2.0 g/L S2O82- concentration by UV/ S2O82- oxidation. 61.8% COD and 93.0% color removal have been achieved at 2.0 g/L S2O82- and 7.5 g/L Fe-Mn-textile waste by S2O82-/Fe-Mn-textile waste oxidation. Besides, COD and color removal reached 87.0% and 99.3% in the UV/S2O82-/Fe-Mn-textile waste oxidation process, respectively. The COD removal improvement of the processes followed the order: UV/S2O82-/Fe-Mn-textile waste > S2O82-/Fe-Mn-textile waste > UV/S2O82-. In addition, Fe-Mn-textile waste also has an excellent adsorbent, and 93.2% color and 32.4% COD removal can be achieved as a result of adsorption at 7.5 g/L Fe-Mn-textile waste. In the Fe-Mn-textile waste reusability studies, it was seen that the material could be used effectively three times. As a result, it is seen that the synthesized Fe-Mn-textile waste material is suitable to provide COD and color removal from biologically treated textile wastewater. Thus, both textile waste is reused and low-cost adsorbent or catalyst can be produced.
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    Magnetic Iron-Doped Filtered Coffee Bio-Waste Based Carbon for the Adsorption of Reactive Blue 21
    (Pleiades Publishing Inc, 2022) Çifci, Deniz İzlen; Aydın, Neşli
    Intensive coffee consumption causes a high amount of coffee waste to be produced annually. In this study, the adsorption of Reactive Blue 21 (RB21) dye by using the magnetic iron-doped filtered coffee bio-waste (magnetic-FCW) was investigated in detail. Magnetic-FCW was characterised by SEM-EDX, mapping, FTIR, and Raman analysis and it was found that the material contains 3.4% Fe by weight. The highest RB21 removal was observed as 97.8% at pH 3 and 5 g/L magnetic-FCW concentration. It was determined that the adsorption of RB21 dye by magnetic-FCW was more describable by the pseudo second-order kinetic model, and k(2) was calculated as 0.086 and 0.0016 g/mg min at 50 and 100 mg/L RB21 concentrations, respectively. In addition, RB21 dye removal with magnetic-FCW was more amenable to the Langmuir isotherm model and the q(max) was calculated as 15.80 mg/g. In conclusion, the use of this bio-waste, which is formed as a result of the rapid increase in the consumption of filtered coffee, in the removal of dyes such as RB21 dye from wastewater, makes it possible to include magnetic-FCW in the field of waste management as a low-cost adsorbent material, which reduces operating costs and makes it possible to reuse these wastes in the waste sector. Collecting these bio-wastes, especially from cafes and restaurants and, reusing them could serve the circular economy as well.