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    Adsorption of Methylene Blue using Bottom Ash: Experimental Design, Isotherm Analysis, and Optimum Conditions
    (Global Network Environmental Science & Technology, 2024) Cifci, Deniz Izlen; Cihan, Mehmet Timur; Gunes, Elcin; Ozturk, Tuba; Gunes, Yalcin
    This study investigated the removal of methylene blue (MB) via adsorption using waste bottom ash. The bottom ash, sourced from a waste storage site in the & Ccedil;orlu district of Tekirda & gbreve; province, Thrace Region, was utilized as the adsorbent. The research examined the impact of several variables on MB removal, including bottom ash dosage, pH, contact time, and agitation speed. It was found that all parameters had a single-variable effect, while pH exhibited a quadratic effect on MB removal in a model- based analysis. The optimization of the model for maximum MB removal identified the optimal conditions as 0.978 g bottom ash dosage, pH 3, 15 minutes of adsorption time, and 50 rpm agitation speed. Under these conditions, the model predicted an MB removal efficiency of 71%, which was experimentally confirmed to be 72.5%. The adsorption process was found to fit with the Freundlich isotherm, indicating a multilayer adsorption mechanism on the heterogeneous surface of the adsorbent. This research not only highlights the feasibility of using bottom ash from coal combustion as an economical adsorbent for dye-contaminated wastewater but also underscores its potential to inform and inspire future studies on waste recycling and wastewater treatment.
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    Sequential use of coagulation and adsorption methods for COD removal from soft drink industry wastewater
    (Polska Akad Nauk, Polish Acad Sciences, Inst Environ Eng Pas, 2024) Sever, Ece; Ozturk, Tuba; Gunes, Elcin
    In this study, the effectiveness of sequentially applying coagulation and adsorption processes in treating soft drink industry wastewater was assessed based on COD removal. In the electrocoagulation method with iron electrodes, the highest COD removal occurred at 42%, achieved with a current of 9A and the natural pH of the wastewater at 5.51. In chemical coagulation, using FeCl3 center dot 6H(2)O as a coagulant, the highest removal rate of 23% was achieved at pH 5 with a coagulant dose of 2.5g/L. Activated carbon adsorption, in doses ranging from 10 to 40g/L, was applied to the effluents of both electrocoagulation and chemical coagulation at various contact times, up to 150 minutes, resulting in COD removal rates of 42% and 36%, respectively. According to the results, the COD removal efficiencies for the electrocoagulation-adsorption and chemical coagulation-adsorption systems were 66% and 51%, respectively. The findings of this study are important because they demonstrate the necessity of research on the use and development of physicochemical methods for the treatment of soft drink industry wastewater.