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Öğe Advanced treatment of coking wastewater by conventional and modified fenton processes(WILEY, 2013) Guclu, Dunyamin; Sirin, Nazan; Sahinkaya, Serkan; Sevimli, Mehmet FaikCoking wastewater contains high a concentration of refractory and toxic compounds to be treated before being discharged into the environment. The water quality usually cannot meet the discharge limits after conventional biological treatment processes. This article initially investigated the treatability of coking wastewater with conventional and modified Fenton processes for advanced treatment of coking wastewater. Based on the experimental results, up to 86% of chemical oxygen demand (COD) and 99.5% of phenol removals were achieved by the conventional Fenton process at original pH 7.8 within 60 min. pH adjustment was not performed due to the sudden drop in the original pH value, after the addition of Fenton's reagents. A modified Fenton process yielded comparable COD (82%) and phenol (98.5%) removals within 120 min at pH 3.0. The optimal operating conditions were determined as [Fe2+] = 300 mg/L, [H2O2] = 4000 mg/L, and pH = 7.8 for a conventional Fenton process, and [Fe0] = 300 mg/L, [H2O2] = 4500 mg/L, and pH = 3 for a modified Fenton process. (c) 2011 American Institute of Chemical Engineers Environ Prog, 32: 176-180, 2013Öğe APPLICABILITY OF FENTON-LIKE PROCESS FOR DECOLORIZATION OF REACTIVE BLACK 5 BY USING RAW LIMONITE ORE(INT SCIENTIFIC CONFERENCE SGEM, 2008) Guclu, Dunyamin; Sahinkaya, Serkan; Aygun, Ahmet; Sevimli, Mehmet FaikThe Fenton process, one of advanced oxidation processes (AOPs), has been widely implemented to remove COD and color for dye wastewater as a pre-treatment or post-treatment process. In recent years, Fenton-like processes have received considerable attention in wastewater removal. The main purpose of the present study was to determine the optimal operational conditions of the Fenton- like process by using raw limonite ore at various concentrations of hydrogen peroxide and raw limonite ore for treatment of dye wastewater on a laboratory scale synthetic wastewater. According to the experimental results, it is indicated that this method can effectively reduce concentrations of color. Under optimal conditions, 98 % removal efficiency was achieved.Öğe Color Removal from Synthetic Textile Wastewater by Sono-Fenton Process(WILEY, 2011) Ozdemir, Celalettin; Oden, Muhammed Kamil; Sahinkaya, Serkan; Kalipci, ErkanIn this study, the oxidative decolorization of C.I. reactive yellow 145 (RY 145) from synthetic textile wastewater including RY 145 and polyvinyl alcohol by Fenton and sono-Fenton processes which are the combination of Fenton process with ultrasound has been carried out. The effects of some operating parameters which are the initial pH of the solution, the initial concentration of Fe2+, H2O2, and the dye, temperature, and agitation speed on the color and chemical oxygen demand (COD) removals have been investigated. The optimum conditions have been found as [Fe2+] = 20 mg/L, [H2O2] 20 mg/L, pH 3 for Fenton process and [Fe2+] = 20 mg/L, [H2O2] 15 mg/L, pH 3 for sono-Fenton process by indirectly sonication at 35 kHz ultrasonic frequency and 80W ultrasonic power. The color and COD removal efficiencies have been obtained as 91 and 47% by Fenton process, and 95 and 51% by sono-Fenton processes, respectively. Kinetic studies have been performed for the decolorization of RY 145 under optimum conditions at room temperature. It has been determined that the decolorization has occurred rapidly by sono-Fenton process, compared to Fenton process.Öğe A comparative study for treatment of white liquor by different applications of Fenton process(ELSEVIER, 2014) Sevimli, Mehmet Faik; Deliktas, Elif; Sahinkaya, Serkan; Guclu, DunyaminIn this paper, the treatability of white liquor by conventional (CFP), modified (MFP) and electro-Fenton oxidation processes (EFP) was investigated depending on the COD parameter. Based on the experimental results, up to 62.4%, 58.4% and 54.9% COD removals by the CFP, MFP and EFP were achieved, respectively. It was observed that adjustment of initial pH to acidic values is not required in the CFP. The optimal operational conditions were found to be [ Fe2+] = 500 mg/L, [ H2O2] = 1000 mg/L at pH 7.3 (original pH) in the CFP, [ Fe 0] = 1250 mg/L, [ H2O2]= 1000 mg/L at pH 3 in the MFP, and I = 1.0 A, [ H2O2] = 1500 mg/L at pH 3 in the EFP, respectively. As a result, the CFP has been determined as a more efficient alternative treatment method. (C) 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University.Öğe THE DECOLORIZATION OF REACTIVE BLUE 21 BY USING FENTON REAGENT(INT SCIENTIFIC CONFERENCE SGEM, 2008) Sevimli, Mehmet Faik; Sahinkaya, Serkan; Aygun, AhmetThis study was focused on the application of Fenton (Fe(+2)/H(2)O(2)) process for the decolorization of colored synthetic wastewaters. Polyvinyl alcohol (PVA) and C.I. Reactive Blue 21 (RB 21) were used as model pollutants. The selection of the optimal operating conditions (initial concentration of H(2)O(2) and Fe(2+)) was performed in a batch reactor. The optimal reacting conditions were experimentally determined and it was found to be initial [H(2)O(2)] 20 mg/L, [Fe(+2)] 37.5 mg/L for synthetic wastewater containing [RB 21] 50 mg/L and [PVA] 100 mg/L at pH 3 with room temperature.Öğe THE DEGRADATION OF REACTIVE BLACK 5 BY FENTON PROCESSS USING RAW IRON PYRITE ORE(INT SCIENTIFIC CONFERENCE SGEM, 2008) Aygun, Ahmet; Sahinkaya, Serkan; Sevimli, Mehmet FaikThis study examined the decolorization of one of the most commonly used reactive dye by using the Fenton-like process [Iron pyrite/H(2)O(2)]. Raw iron pyrite ore contains 28,68 % Fe. Oxidation experiments were run in 500 mL-glass beakers that were continuously stirred for up to 180 min at a constant rate of 200 rpm, after initiation of the Fenton process. A series of experiments were carried out at various concentration of hydrogen peroxide and raw iron pyrite ore while the pH value was kept constant at 3 in order to determine the optimum conditions of these. From 50 mg/L to 750 rng/L of raw iron pyrite ore and 5 to 75 rng/L dosage of H(2)O(2) were applied for the determination of operational conditions. The decolorization of RB 5 was measured with UV-Vis spectrophotometer. Manganese oxide (MnO(2)) was used for quenching H(2)O(2) to prevent any interference after sampling. It was found that optimum dosages of H(2)O(2) and raw iron pyrite ore were 37,5 mg/L and 300 mg/L, respectively. At the optimum conditions color removal was 92,8 %. The experiments indicate that RB 5 can be effectively decolorized textile effluent by Fenton like process which uses pyrite as the iron source.Öğe Effects and modelling of ultrasonic waste-activated sludge disintegration(WILEY, 2013) Sahinkaya, Serkan; Sevimli, Mehmet FaikSonication is a well-known sludge pretreatment technique with the advantages of simple operation and high efficiency. However, it is an energy-intensive process. Hence, it is very important to predetermine its sludge disintegration efficiency at varying pretreatment conditions in order to minimize the ultrasonic energy consumption. In this study, it was found that the ultrasonic sludge disintegration occurred in two stages: rapid and subsequent slow disintegration stages. For this reason, it was aimed to develop a simple and accurate mathematical model to describe the two-stage sludge disintegration as a function of pretreatment conditions. Sludge concentration and ultrasonic density along with sonication period were involved in this model as independent variables. It was determined that the mathematical model can predict accurately the degree of sludge disintegration. Thus, the proposed model was seen to be very useful for evaluating the disintegration efficiency and/or for process design using the operating parameters under different conditions.Öğe Evaluation of manageable biological waste utilization of Konya in terms of environment and energy recovery(SILA SCIENCE, 2011) Kalipci, Erkan; Ozdemir, Celalettin; Sahinkaya, SerkanIn this study, it was aimed to determine the potential for energy production from biogas in Konya and to draw the attention of public opinion about the importance of generalization of biogas utilization in terms of both environment and energy recovery. In our research, biogas recovery was calculated depending on the number of available bovine, ovine and poultry indicated in Agriculture Master Plan of Konya by Ministry of Agriculture and Regional Affairs in 2004 as well as the potential of arable crops grown in Konya. As a result of this research, it was determined that totally 121,919,955.5 m(3)/year biogas could be obtained from agricultural products together with animal organic substances in Konya city. When this biogas (121,919,955.5 m(3)/year) is evaluated instead of petroleum utilization, it was determined that CO2 emission will be reduced in an amount of 316,991,884.3 kg/year. In Konya, it was also indicated that totally 2,343,332.1 tons/year fertilizers including 1,157,220 tons/year fertilizer from bovines, 925,998.5 tons/year fertilizer from ovine and 260,113.59 tons/year fertilizer from poultry can be obtained. Both chemical fertilizer utilizations will be significantly reduced and efficiency in agriculture will be improved by using this kind of fertilizer in agriculture. When the electrical energy equivalence (kWh/day) of biogas was calculated, it was determined that 1,444,563.8 kWh/day electrical energy saving will be supplied which includes 491,737.5 kWh/day from bovine, 691,576.8 kWh/day from ovine and 261,249.5 kWh/day from poultry. Approximately 16,003 m(3) methane gas will be obtained from barley, wheat, corn straw as well as clover, sainfoin and vetch in Konya. Since 1 m(3) methane gas is enough for cooking of a five-member family, the cooking need of around 16,000 families a day will be met by this potential. When animal potential and agricultural area in our country are taken into consideration, it's apparent that there will be many benefits in terms of sustainable ecological balance, economical income and clean energy recovery by generalizing the biogas plants especially in rural areas.Öğe Physico-Chemical Studies of Enamel Cover Industry Wastewater(ASIAN JOURNAL OF CHEMISTRY, 2009) Ozdemir, Celalettin; Karatas, Mustafa; Sahinkaya, Serkan; Argun, Mehmet EminThe enamel plating industry wastewater has a reputation for being a major pollutant. Plating has become a major industry and is one of the fastest growing sectors of the world economy. Enamel industry is typically associated with detrimental environmental effects. There was not exactly a study source of enamel cover wastewater and characteristics in Turkey. This study has been made for completing this subject and to solve available problems. To achieve the objectives of the study, the samples taken from metal plating wastewater, were analyzed in the laboratories. Waste-water produced plating unit in enamel have high chemical oxygen demand (394 mg L(-1)) and suspended solid (486 mg L(-1)) concentrations. In this study, physico-chemical properties were also evaluated in enamel plating industry wastewater. The optimum polielectrolyte dose with lime addition was determined as 1660 mgL(-1) in order to obtain 86 % COD, 94 % TSS removal effiency at pH 9.Öğe Post-Treatment of Coking Industry Wastewater by the Electro-Fenton Process(WILEY, 2013) Guclu, Dunyamin; Sahinkaya, Serkan; Sirin, NazanEffluents of the coking industry cannot be effectively treated in biological treatment units because of non-biodegradable organic matters and phenolic compounds present in the wastewater. In this study, post-treatment of biologically treated coking wastewater via the electro-Fenton process was investigated to minimize the effects of discharge of this kind of wastewater on the environment. The electro-Fenton experiments were performed using cast iron electrodes. Chemical oxygen demand (COD) and phenol were selected as the target parameters. The optimum operating conditions were as follows: reaction time = 10 minutes, pH = 3.0, electrical current = 1.0 A, and [H2O2] = 2000 mg/L. Under these conditions, COD and phenol removal efficiencies were 67.8% and 98.0%, respectively. In addition, it was determined that COD removal followed first-order reaction kinetics. Consequently, the electro-Fenton process was determined as an effective alternative post-treatment method for coking industry effluents.Öğe Sono-thermal pre-treatment of waste activated sludge before anaerobic digestion(ELSEVIER, 2013) Sahinkaya, Serkan; Sevimli, Mehmet FaikSonication and thermalization can be applied successfully to disrupt the complex waste activated sludge (WAS) floc structure and to release extra and intra cellular polymeric substances into soluble phase along with solubilization of particulate organic matters, before sludge digestion. In this study, sonication has been combined with thermalization to improve its disintegration efficiency. It was aimed that rise in temperature occurring during the sonication of sludge was used to be as an advantage for the following thermalization in the combined pre-treatment. Thus, the effects of sonication, thermalization and sono-thermalization on physical and chemical properties of sludge were investigated separately under different pre-treatment conditions. The disintegration efficiencies of these methods were in the following descending order: sono-thermalization > sonication > thermalization. The optimum operating conditions for sono-thermalization were determined as the combination of 1-min sonication at 1.0 W/mL and thermalization at 80 degrees C for 1 h. The influences of sludge pre-treatment on biodegradability of WAS were experienced with biochemical methane potential assay in batch anaerobic reactors. Relative to the control reactor, total methane production in the sono-thermalized reactor increased by 13.6% and it was more than the sum of relative increases achieved in the sonicated and thermalized reactors. Besides, the volatile solids and total chemical oxygen demand reductions in the sono-thermalized reactor were enhanced as well. However, it was determined that sludge pre-treatment techniques applied in this study was not feasible due to their high energy requirements. (C) 2012 Elsevier B.V. All rights reserved.Öğe The sonochemical decolorisation of textile azo dye CI Reactive Orange 127(WILEY-BLACKWELL, 2011) Ozdemir, Celalettin; Oden, Muhammed K.; Sahinkaya, Serkan; Guclu, DunyaminIn the present study, Fenton and sono-Fenton processes were applied to the oxidative decolorisation of synthetic textile wastewater including CI Reactive Orange 127 and polyvinyl alcohol. Process optimisation [pH, ferrous ion (Fe(2+)) and hydrogen peroxide (H(2)O(2))], kinetic studies and their comparison were carried out for both of the processes. The sono-Fenton process was performed by indirect sonication in an ultrasonic water bath, which was operated at a fixed 35-kHz frequency and 80 W power. The optimum conditions were determined as [Fe(2+)] = 20 mg l(-1), [H(2)O(2)]= 15 mg l(-1) and pH = 3 for the Fenton process and [Fe(2+)] = 25 mg l(-1), [H(2)O(2)] = 5 mg l(-1) and pH = 3 for the sono-Fenton process. The colour removals were 89.9% and 91.8% by the Fenton and sono-Fenton processes, respectively. The highest decolorisation was achieved by the sono-Fenton process because of the production of some oxidising agents as a result of sonication. Consequently, ultrasonic irradiation in the sono-Fenton process slightly increased the colour removal to 91.8%, while decreasing the hydrogen peroxide dosage to one-third of that of the Fenton process.Öğe Synergistic effects of sono-alkaline pretreatment on anaerobic biodegradability of waste activated sludge(ELSEVIER SCIENCE INC, 2013) Sahinkaya, Serkan; Sevimli, Mehmet FaikThe individual and combined effects of alkaline and ultrasonic pretreatment on both physical and chemical properties and anaerobic biodegradability of waste activated sludge (WAS) were investigated comprehensively in this study. The experimental results showed that both disintegration and anaerobic biodegradability of WAS were significantly improved by the combination of alkaline and ultrasonic (sono-alkaline) pretreatment. Besides, it was determined that the hydraulic retention time in anaerobic digester can be shortened by half using this combined pretreatment. However, it was also determined that sono-alkaline pretreatment was not feasible economically due to its high energy requirement. Crown Copyright (C) 2012 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry. All rights reserved.Öğe Treatment of pesticide wastewater by physicochemical and Fenton processes(ASIAN JOURNAL OF CHEMISTRY, 2008) Ozdemir, Celalettin; Sahinkaya, Serkan; Onucyildiz, MustafaThe process of pesticide removal from industrial wastewater using which chemical, vacuum-chemical and Fenton's reactions have been analyzed. Fenton process is attractive alternative to conventional oxidation processes in effluent treatment of recalcitrant compounds. The aim of this study is to evaluate the efficiency of chemical, vacuum and Fenton processes for the reduction of chemical oxygen demand in wastewaters from pesticide industry. In this study wastewater from pesticide industry was used. Whereas in the chemical procedure [Ca(OH)(2) and KMnO4], the chemical oxygen demand removal efficiency is 94.9%; in the vacuum-Ca(OH)(2) + KMnO4 system (with 250 mg/L KMnO4, 1 mL H2SO4, 5 mg/L polyelectrolyte and 2000 mg/L CaOH application) this efficiency was 97.8%; and a 99.8% KOI removal efficiency was obtained by the Fenton process (the optimum ratio of [Fe2+] to [H2O2] was 1:1.56 (mM/mM), at pH 3.0).
