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Öğe Advanced Oxidation of Biologically Pretreated Baker's Yeast Industry Effluents for High Recalcitrant COD and Color Removal(2003) Altınbaş, Mahmut; Aydın, Ali Fuat; Sevimli, Mehmet Faik; Öztürk, İzzetThe aim of this study was to investigate the effectiveness of chemical oxidation by applying ozonation, ozonation with hydrogen peroxide and Fenton's processes for decolorization and residual COD removal of biologically pretreated baker's yeast industry (BYI) effluents. Baker's yeast industry effluents characterizing with high COD, TKN, dark color, and non-biodegradable organic pollutants. The batch tests were performed to determine the optimum operating conditions including pH, O3, H2O2, and FeSO4 dosages, molar ratio of Fe2+/H2O 2 and reaction time. It was noticed that H2O2 significantly reduced the reaction times for the same ozone dosages; however, COD and color removals were not remarkable. In the Fenton's oxidation studies, the removal efficiencies of COD and color for 30 min reaction time for three different types of BYI effluents were found about 86 and 92%, respectively. Experimental results of the presented study have clearly indicated that the Fenton's oxidation technology is capable to fate almost all parts of the organics which consist of both soluble initial and microbial inert fractions of COD for baker's yeast effluents. Effluents from the Fenton's oxidation process can satisfy effluent standards for COD and color in general.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 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 Effects of pH and Dissolved Organic Matter on the Formation of Disinfection By-Products by Chlorination and Chloramination(WORLD SCIENTIFIC AND ENGINEERING ACAD AND SOC, 2009) Kucukcongar, Sezen; Sevimli, Mehmet Faik; Yel, EsraA major concern for water utilities is the formation of DBPs resulting from reactions between DOM and disinfectant. THMs and HAAs are the most common and have diverse toxicological effects. The formations of THMs and HAAs by chlorination with chlorine and chloramine at several DOM concentrations and pH's were investigated. Water sample was obtained from Istanbul Omerli Dam, isolated using a laboratory scale membrane system used for chlorination study at different organic matter concentrations. Diluted isolate samples were chlorinated according to UFC protocol. 24 hours after chlorination THM formation was in lower level at acidic pH, whereas at neutral or basic pH, higher concentrations of THMs formed. For all DOC conditions ultimate DBP levels were reached at 24 hours. Chloraminated samples slightly acidic (6) and slightly basic (8) pH resulted in lower THM from neutral pH. HAA formation in pH 6 and 7.2 were equal while lower at pH 8. Despite strong fluctuations ultimate levels were reached in the first 8 hours after chloramination. All formed DBPs except BF were considerably higher in chlorination. Effect of pH in the range of 6 to 8 was approximately the same in both disinfectants. Chloramination completes DBP formation reactions earlier and results in much lower quantities in terms of total THMs and HAAs.Öğe EVALUATION OF DECENTRALIZED AND CENTRALIZED WASTEWATER TREATMENT PLANTS(INT SCIENTIFIC CONFERENCE SGEM, 2008) Onucyildiz, Mustafa; Sevimli, Mehmet Faik; Gorgulu, GkvencIn this study, it is aimed to find out which wastewater treatment plant (WWTP) is more economical by means of comparison of initial investment costs and operational costs of decentralized and centralized domestic wastewater treatment plants in and around Antalya which is located in Mediterranean Region. For this purpose, data of 14 decentralized and 5 centralized domestic wastewater treatment plants is evaluated. The design flowrates of decentralized and centralized WWTP are varying 120-900 m(3) day(-1) and 5000-22000 m(3) day(-1) respectively. As the flowrate capacity of WWTP increases, the initial investment cost and also operational cost for the treatment of per m 3 of wastewater decreases. The results show us that the mean cost of I in 3 wastewater treatment is about 0.17 $m(-3) in the decentralized wastewater treatment plants and 0.10 $m(-3) in the centralized wastewater treatment plants. This means that, collecting and transferring the wastewater to the central domestic wastewater treatment plants and making the treatment process in these plants are more economical than decentralized domestic wastewater treatment plants.Öğe Joint Operation of Small Wastewater Treatment Plants in Southern Turkey(I W a Publishing, 2003) Sarıkaya, H. Z. ; Sevimli, Mehmet Faik; Koyuncu, İsmail; Yüksel, ErcanIn this study, joint operation of several small wastewater treatment plants (SWWTPs) by the same operation company is proposed to avoid operational problems such as unqualified personnel, inadequate maintenance and laboratory services. Some case studies from Antalya province of Turkey are presented, Several SWWTPs are operated by the companies formed with the proportional shares of the owners such as ALTAS and TURAS. The performance data of the five treatment plants operated by ALTAS and two treatment plants operated by TURAS are presented. The status of wastewater treatment with emphasis on the small sized plants is also presented and evaluated. The percentage of small settlements served with sewer and wastewater treatment facilities is very low (3%) indicating that high volumes of investment are needed to increase the level of service to those of the developed countries. At present, the total number of the treatment plants in Antalya region is 409 with capacities ranging from 73 to 175 m3d(-1). Package activated sludge type SWWPs built especially in the coastal regions meet the local effluent standards.Öğe Konya II. organize sanayi bölgesindeki zemin suyunun beton içindeki çeliğe olan etkisi(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 1991) Sevimli, Mehmet Faik; Yüceer, AhmetKonya II. Organize Sanayi Bölgesi zemin suyunun beton içindeki çeliğe olan etkilerini belirlemek üzere iki grup deney yapılmıştır. Bunlardan birincisi doygun kalsiyum hidroksit çözeltisi içinde ikincisi de gerçek beton ortamında yapılmıştır. Deneylerde S 220 (BÇ I) inşaat çeliği kullanılmıştır. Birinci grup deneylerde, içerisinden sürekli olarak oksijen gazı geçirilen doygun haldeki kireç çözeltisinde tutulan çelik numunelerin yirmibir gün süreyle potansiyelleri ölçülmüştür. Bu deneyler kalsiyum hidroksitle doygun hale getirilmiş saf su, şehir şebeke suyu ve araştırma alanının zemin suyu çözeltilerinde yapılmıştır. İkinci grup deneyler için, iki tip beton blok dökülmüştür. Birinci tip beton blok şehir şebeke suyuyla, ikinci tip beton blok araştırma alanı zemin suyu ile imal edilmiştir. Bu numunelere yerleştirilen 10 mm çapındaki çelik çubukların yirmidokuz gün süreyle potansiyelleri ölçülmüştür. Daha sonra ikinci tip beton blok polarizasyon deneyine tabi tutularak korozyon hızı tesbit edilmiştir. Yapılan potansiyel ölçümleri sonunda çeliğin aktif- pasif durumu hakkında kalitatif fikirler elde edilmiştir. Labaratuvarda yapılan deney sonucu araştırma alam zemin suyunun temas ettiği çeliğin aktif hale geldiği ve potansiyelinin -450 mV'den daha negatif değerler aldığı görülmüştür. Beton içindeki çeliğin 29150 ppm gibi aşın klorürlü ortamdaki korozyon hızı ise 9.8 mA/m2 (1.13 x 10"2 mm/yıl) olarak bulun muştur. Elde edilen deney sonuçlarına göre, bu bölgede yapılan sanayi yapılarında bu olumsuz etkilere karşı uygulanması gereken önlemler tavsiye edilmiştir.Öğe A New Approach to Determine the Practical Ozone Dose for Color Removal From Textile Wastewater(Taylor & Francis Inc, 2003) Sevimli, Mehmet Faik; Sarıkaya, Hasan Zuhuri ; Yazgan, Mustafa SaitIn this study, the effect of applied ozone dose and pH on color removal from textile wastewater was studied. A lab-scale ozonation system was used in the experiments. When the applied ozone dose increased, the color removal efficiency and the rate constants increased, whereas ozone utilization ratio decreased. On the other hand, increasing the pH increased color removal efficiency and ozone consumption but decreased specific ozone dose. By using the experimental results, a new model has been developed to determine the required ozone dose for the removal of color. By means of this method, it was possible to determine the required ozone dose for reducing the amount of color up to desired levels. Experimental results and the model predictions were in good agreement not only for textile wastewater but also for different industrial effluents. Some parameters affecting ozone utilization such as pH, could also be incorporated into the model.Öğe Organik madde konsantrasyonunun trihalometan (THM) bileşiklerinin oluşumuna etkisi(Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2009) Küçükçongar, Sezen; Sevimli, Mehmet Faik; Yel, EsraKlor en yaygın olarak kullanılan dezenfektandır ve sulardaki doğal organik maddeler (DOM) ile reaksiyona girerek dezenfeksiyon yan ürünlerini (DYÜ) oluşturmaktadır. DYÜ’lerin en yaygın iki türü trihalometan (THM) ve haloasetik asit (HAA) bileşikleri insan ve çevre sağlığı açısından oldukça sakıncalıdır. Bu çalışmada Konya’da evsel ve endüstriyel su temininde ihtiyacı karşılayan Altınapa Barajı’ndan alınan su örneği, ters osmoz membran sisteminden geçirilerek mevcut çözünmüş organik maddelerin izole edilmesi sağlanmıştır. Elde edilen izolattan belirli seyreltmeler yapılarak farklı organik madde konsantrasyonlarında 4 farklı THM bileşiğinin oluşumu ve türlerin dağılımı belirlenmiştir. Farklı organik madde konsantrasyonlarında elde edilen toplam THM miktarı 58?108 ?g/L aralığındadır ve toplam THM içerisinde kloroform (CF) % 63?89’luk kısmı oluşturmaktadır. Organik madde konsantrasyonun artırılması ile THM bileşiklerinin konsantrasyonlarının arttığı tespit edilmiştir.Öğe Physicochemical Pretreatment and Dewaterability of Septage(INST LEBENSMITTELTECHNOLOGIE ANALYTISCHE CHEMIE, 2001) Akça, Lütfi; Sevimli, Mehmet Faik; Alp, Kadir; Demir, A.; Çitil, Elif TuğçeIn this study, chemical treatability of septa-e was investigated. The septage, taken from the equalization tank of an existing septa-e treatment plant, was coagulated by different chemicals such as alum, alum plus polyelectrolite (PE) and lime plus PE in varying dosages. After coagulation-flocculation and sedimentation TSS, COD and total phosphorus (TP) parameters of the liquid phase were measured. Capillay suction time (CST) was measured as an indication of the dewaterability of the sludge generated from coagulation. The best results were obtained by alum plus PE and the optimum dosages for alum and PE were found to be 200 mg/l and 2 mg/l, respectively. The COD and TSS removal efficiencies were satisfactory and the phosphorus concentration of the liquid phase was appropriate for the nutrient balance required by activated sludge microorganisms. Dewaterability of sludge was also at satisfactory levels. These results imply that dewaterability of sludge could be considered as an additional parameter for the determination of optimum coagulants.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 Su kaynaklarında hümik maddelerin reçine adsorpsiyon kromatografi tekniği ile izolasyonu(Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2012) Küçükçongar, Sezen; Sevimli, Mehmet Faik; Yel, EsraDoğal organik maddeler (DOM) tüm yüzeysel sularda ve yeraltı sularında kompleks reaksiyonların bir sonucu olarak bulunduğundan oldukça heterojen bir bileşimdedir. DOM’in yaklaşık %90’ı sularda çözünmüş formda bulunmaktadır ve bu çözünmüş organik maddeler (ÇOM) içerisinde sucul hümik maddeler (SHM) en yüksek miktarda bulunan fraksiyondur. Su kaynaklarına yönelik çalışmalarda SHM’lere ilginin artmasındaki temel nedenlerden birincisi, içme suyu arıtımında kullanılan farklı oksidan ve dezenfektanlarla verdikleri reaksiyonlar sonucu insan sağlığı için zararlı olan dezenfeksiyon yan ürünlerini (trihalometanlar, haloasetik asitler vd.) oluşturmasıdır. İkinci neden ise su ortamlarında organik ve inorganik pek çok kirletici ile kompleks oluşturması veya sorplayarak suda taşımaya eğilimli olmasıdır. SHM’lerin sulardan izolasyonunda çok farklı yöntemler uygulanabilmektedir. Farklı reçineler kullanarak uygulanan reçine adsorpsiyon kromatografi (RAK) tekniği, yüksek hacimlerdeki sulardan SHM’leri gidermek ve konsantre hale getirmek için sıklıkla kullanılan bir metottur. Bu çalışmada RAK yönteminde Amberlite XAD-8, Bio-Rad AG-MP-50 ve Duolite A-7 reçineleri kullanılarak ÇOM fraksiyonlarına ayırma yöntemi uygulanmıştır. Reçineler, literatürde geliştirilen metotlar ve bazı modifikasyonlarla temizleme ve şartlandırma işlemlerine tabi tutulmuştur. Farklı yüzeysel su kaynaklarından alınan numunelere RAK yöntemi uygulanarak hidrofobik ve hidrofilik özelliklerine göre altı farklı fraksiyon elde edilmiştir. Bu fraksiyonların farklı yüzeysel su kaynakları için yüzde dağılımları belirlenmiştir.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 combined acid mine drainage (AMD)-Flotation circuit effluents from copper mine via Fenton's process(ELSEVIER, 2009) Mahiroglu, Ayse; Tarlan-Yel, Esra; Sevimli, Mehmet FaikThe treatability of a copper mine wastewater, including heavy metals,AMD, as well as flotation chemicals, with Fenton process was investigated. Fenton process seems advantageous for this treatment, because of Fe2+ content and low pH of AMD. First, optimum Fe2+ condition under constant H2O2 was determined, and initial Fe2+ content of AMD was found sufficient (120mg/L for removal of chemical oxygen demand (COD) of 6125 mg/L). In the second step, without any additional Fe2+, optimum H2O2 dosage was determined as 40 mg/L Fe2+/H2O2 molar ratio of 1.8 was enough to achieve the best treatment performance. In all trials, initial pH of AMD was 4.8 and pH adjustment was not performed. Utilization of existing pH and Fe2+, low H2O2 requirements. and up to 98% treatment performances in COD, turbidity, color, Cu2+, Zn2+ made the proposed treatment system promising. Since the reaction occurs stepwise, a two-step kinetic model was applied and calculated theoretical maximum removal rate was consistent to experimental one, which validates the applied model. For the optimum molar ratio (1.8), 140 mL/L sludge of high density (1.094 g/mL), high settling velocity (0.16cm/s) with low specific resistance (3.15 x 10(8) m/kg) was obtained. High reaction rates and easily dewaterable sludge characteristics also made the proposed method advantageous. (C) 2008 Elsevier B.V. All rights reserved.
