Yazar "Yel, Esra" seçeneğine göre listele
Listeleniyor 1 - 18 / 18
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Artificial algae algorithm (AAA) for nonlinear global optimization(ELSEVIER SCIENCE BV, 2015) Uymaz, Sait Ali; Tezel, Gulay; Yel, EsraIn this study, a novel bio-inspired metaheuristic optimization algorithm called artificial algae algorithm (AAA) inspired by the living behaviors of microalgae, photosynthetic species, is introduced. The algorithm is based on evolutionary process, adaptation process and the movement of microalgae. The performance of the algorithm has been verified on various benchmark functions and a real-world design optimization problem. The CEC'05 function set was employed as benchmark functions and the test results were compared with the algorithms of Artificial Bee Colony (ABC), Bee Algorithm (BA), Differential Evolution (DE), Ant Colony Optimization for continuous domain (ACO(R)) and Harmony Search (HSpop). The pressure vessel design optimization problem, which is one of the widely used optimization problems, was used as a sample real-world design optimization problem to test the algorithm. In order to compare the results on the mentioned problem, the methods including ABC and Standard PSO (SPS02011) were used. Mean, best, standard deviation values and convergence curves were employed for the analyses of performance. Furthermore, mean square error (MSE), root mean square error (RMSE) and mean absolute percentage error (MAPE), which are computed as a result of using the errors of algorithms on functions, were used for the general performance comparison. AAA produced successful and balanced results over different dimensions of the benchmark functions. It is a consistent algorithm having balanced search qualifications. Because of the contribution of adaptation and evolutionary process, semi-random selection employed while choosing the source of light in order to avoid local minima, and balancing of helical movement methods each other. Moreover, in tested real-world application AAA produced consistent results and it is a stable algorithm. (C) 2015 Elsevier B.V. All rights reserved.Öğe Artificial algae algorithm with multi-light source for numerical optimization and applications(ELSEVIER SCI LTD, 2015) Uymaz, Sait Ali; Tezel, Gulay; Yel, EsraArtificial algae algorithm (AAA), which is one of the recently developed bio-inspired optimization algorithms, has been introduced by inspiration from living behaviors of microalgae. In AAA, the modification of the algal colonies, i.e. exploration and exploitation is provided with a helical movement. In this study, AAA was modified by implementing multi-light source movement and artificial algae algorithm with multi-light source (AAA(ML)) version was established. In this new version, we propose the selection of a different light source for each dimension that is modified with the helical movement for stronger balance between exploration and exploitation. These light sources have been selected by tournament method and each light source are different from each other. This gives different solutions in the search space. The best of these three light sources provides orientation to the better region of search space. Furthermore, the diversity in the source space is obtained with the worst light source. In addition, the other light source improves the balance. To indicate the performance of AAA with new proposed operators (AAA(ML)) experiments were performed on two different sets. Firstly, the performance of AAA and AAA(ML) was evaluated on the IEEE-CEC'13 benchmark set. The second set was real-world optimization problems used in the IEEE-CEC'11. To verify the effectiveness and efficiency of the proposed algorithm, the results were compared with other state-of-the-art hybrid and modified algorithms. Experimental results showed that the multi-light source movement (MLS) increases the success of the AAA. (C) 2015 Elsevier Ireland Ltd. All rights reserved.Öğe A Comparative Study on Waste Plastics Pyrolysis Liquid Products Quantity and Energy Recovery Potential(ELSEVIER SCIENCE BV, 2017) Sogancioglu, Merve; Ahmetli, Gulnare; Yel, EsraPlastics thermal processing is an important application for both energy recovery and feedstock recycling. In this study effects of type of plastic (HDPE, LDPE, PET, PP, PS), pyrolysis process temperature and plastic waste prewashing on pyrolysis liquid product (oil) fraction, its hydrocarbon (HC) contents and heat values were investigated. Caustic washing and batch-pyrolysis were applied by keeping pyrolysis heating rate and other conditions constant. Oil yields, C10-C40 HCs, heat values were measured and compared. HDPE type plastic wastes produced the highest oil yield while PET and PP produced the lowest yields. C10-C40 HC contents of pyrolysis oils were strongly affected from the pyrolysis temperatures and pre-washing process under identical pyrolysis conditions. The highest C10-C40 HCs were produced by HDPE pyrolysis. Statistical analysis indicated that the effect of pre-washing process on the pyrolysis oil heat value is significant for HDPE and PP type plastics. Pyrolysis temperature had almost no effects on oil heat values for washed PET and unwashed PS wastes, whereas for other plastic samples, as pyrolysis temperature increased oil heat values increased. HDPE, LDPE, PP and PS pyrolysis oils have higher calorific values than wood and some coal types. These refer to energy recovery from those types of plastics. (C) 2017 The Authors. Published by Elsevier LtdÖğe 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 Enhancement of concrete properties by waste physicochemical treatment sludge of travertine processing wastewater(ELSEVIER SCI LTD, 2016) Soğancıoğlu, Merve; Yel, Esra; Aksoy, Sümeyye; Ünal, V. EcemTravertine treatment sludges are by-products derived from travertine marble processing plants. These treatment sludges are being generated in considerable amounts in marble production plants in Turkey. Various proportions (5-15% w/w of the cement) of physicochemical sludge admixtures obtained from the physico-chemical treatment (coagulation-flocculation) of a travertine processing plant wastewater were used ascement replacement for concrete with 250 kg/m(3) cement dosage. Slump tests were performed on fresh concrete, and compressive strengths were determined for 7 and 28 days hardened concrete samples. The freeze/thaw resistance, water absorption, capillary suction, void ratio and porosity were performed for the hardened concrete samples. Considering the properties of hardened concrete such as compressive strength, workability and physical properties, AS and NS are the admixtures that can be suggested both to enhance the concrete properties and to have a new utilization area for a waste material. Higher 28-day compressive strength of about 28.43 MPa (AS) and 28.82 MPa (NS) was achieved at 15% admixing level by weight of cement while reference sample compressive strength was 25 MPa. (C) 2015 Elsevier Ltd. All rights reserved.Öğe Heavy Metal Uptake Kinetics of Microalgae in Aquatic Media(WORLD SCIENTIFIC AND ENGINEERING ACAD AND SOC, 2009) Gok, Zehra; Yel, EsraHeavy metals as a group of hazardous contaminants in aquatic life are removed from the medium via biological processes Microalgae can efficiently utilize a combination of extracellular and intracellular adaptive and constitutive enzymes in the biochemical breakdown and assimilation of these inorganic materials. This study indicate the algal behavior under various metal conditions by indicating the algal uptake rates of metals and growth kinetics of algal biomass under controlled ligt and temperature conditions and under single-metal cases for zinc (Zn2+), copper (Cu2+) and iron (Fe2+). Algal biomass could tolerate up to 5 mg/l of each metals and could remove 37, 75 and 36% of Zn2+, Cu2+ and Fe2+, respectively. In all metals, metal removal followed first and second order kinetics together, while algal growth followed zero order kinetics during this reduction. Pseudo-first order kinetics were also checked and data found suitable for this. The highest removal rate, achieved in Fe2+ (0.00138 meq/L.d) was followed by Zn2+ (0.00107 meq/L.d) and then Cu2+ (0.00096 meq/L.d) while the order of growth rates was the same (0.0113, 0.0098 and 0.0055 for Fe2+, Zn2+ and Cu2+, respectively).Öğe Investigation of the Effect of Polystyrene (PS) Waste Washing Process and Pyrolysis Temperature on (PS) Pyrolysis Product Quality(ELSEVIER SCIENCE BV, 2017) Sogancioglu, Merve; Yel, Esra; Ahmetli, GulnarePyrolysis has been proposed as a viable processing route for recovering the organic compounds from polystyrene (PS) plastic wastes as fuels and chemical feedstock. In this study, PS plastic wastes were collected; some portion of them was washed in field-simulated laboratory scale system. Both washed and unwashed PS plastic waste samples were pyrolyzed at fixed bed reactor pyrolysis equipment. The pyrolysis process has been applied at 300, 400, 500, 600 and 700 degrees C with 5 degrees C/min heating rate. The effect of pyrolysis temperature and plastic washing process on the pyrolysis yields and solid, oil and gas products quality were investigated. The solid products (char) were characterized by FTIR and SEM. Oil and gas products were analyzed by gas chromatography coupled with a mass spectrometry (GC-MS). The heat values were determined using an automatic calorimetric bomb. Pyrolysis oil products composed of heavy hydrocarbons (C10-C40). Heating values were found between 4300-4800 kCal. Pyrolysis gases of both wased and unwashed PS mainly contain gas samples contain pentene, pentane, hexane, benzene, heptane, toluene, octane, ethylbenzene and styrene. Each of these components has potential for use as fuel or as raw materials for various industrial processes after proper separation process. (C) 2017 The Authors. Published by Elsevier LtdÖğe 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 Photo/photochemical oxidation of cyanide and metal-cyanide complexes: ultraviolet A versus ultraviolet C(TAYLOR & FRANCIS LTD, 2012) Ozcan, Ercan; Gok, Zehra; Yel, EsraDegradation of free cyanide (CN-), weak-acid dissociable (WAD) (Zn(CN)(4)(2-), Cu(CN)(3)(2-)) and strong-acid dissociable (SAD) (Fe(CN)(6)(4-)) cyanide complexes by photo and photochemical oxidation with ultraviolet (UV) light and H2O2 was investigated. The experiments were performed in batch reactors under ultraviolet A (UVA; 395 nm) and ultraviolet C (UVC; 254 nm) light; the degradation efficiency was followed in terms of free cyanide, complex and metal concentrations. UVC and UVA photo-oxidations were found to be equally effective in CN- and WAD degradation, while the degradation of the SAD complex was more difficult for both UV wavelengths, and UVC was more effective. The initial pH of the solution has influenced the degradation of all cyanide species and the optimum initial pH was evaluated as 10.5 for CN- and Cu(CN)(3)(2-); 12.0 for Zn(CN)(4)(2-) and 9.0 for Fe(CN)(6)(4-) degradation. Photochemical oxidation using H2O2 provided higher degradation at shorter durations with both UVA and UVC. Time-dependent variations in free cyanide and metal concentrations have indicated that metal-cyanide complexes are firstly degraded into metal and CN- ions, followed by oxidation of CN- ions, while metals in the system were partially removed as hydroxide precipitates. Therefore, depending upon the effluent requirements, the studied UV photo/photochemical oxidations were offered as either a pre-treatment method for the separation of metal and the cyanide, or as an oxidation technology to degrade especially WAD complexes and CN-. Estimated operational cost of photo-oxidation by UVC was 1.6-2.5-fold higher than UVA degradation, although degradation times were close. In the photochemical oxidation with H2O2, the operational costs of UVC and UVA degradation were closer, owing to peroxide costs, but UVC was still more expensive.Öğe Prediction of primary treatment effluent parameters by Fuzzy Inference System (FIS) approach(ELSEVIER SCIENCE BV, 2011) Yel, Esra; Yalpir, SukranA fuzzy-logic-based diagnosis system was developed to determine the primary treatment effluent quality in a municipal wastewater treatment plant (MWTP). The measured data of variables were implemented into the Fuzzy Inference System (FIS) with Mamdani's method. The fuzzy control rule base was shaped to define essential quality parameters monitored as pH, COD, BOD and SS outputs. The output approximations to real data remained in an acceptable range for a MWTP performance (89-96%). The averages and standard deviations of the model were also approximated closely as 93-98% and 89-97%, respectively. The resulting configuration proved a good modeling approach for MWTP effluent quality prediction. (C) 2010 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the Guest Editor.Öğe Production of Epoxy Composite from the Pyrolysis Char of Washed PET Wastes(ELSEVIER SCIENCE BV, 2017) Sogancioglu, Merve; Yucel, Alize; Yel, Esra; Ahmetli, GulnarePyrolysis of washed poly (ethylene terephthalate) (PET) plastic wastes was performed, pyrolysis products yields were determined and epoxy composite was prepared with char additive in this study. The pyrolysis runs were carried out in the temperature range of 300-700 degrees C in order to indicate the effects of pyrolysis temperature on products. The char from pyrolysis was used in the production of epoxy composite material and char replaced at 10 to 50 wt% of the epoxy resin. Mechanical properties, namely tensile strength, surface hardness and electrical properties were determined for the epoxy composite materials. The tensile strength increased 131% at the dose of 50% for char obtained at 300 degrees C. The hardness was improved up to 83-89 shore D from 80 shore D by the PET char additive in the composite. Epoxy composite material obtained by PET pyrolysis char additive obtained at 300 degrees C showed the better behavior in terms of elongation at break and tensile strength. (C) 2017 The Authors. Published by Elsevier LtdÖğe Pyrolysis of waste high density polyethylene (HDPE) and low density polyethylene (LDPE) plastics and production of epoxy composites with their pyrolysis chars(ELSEVIER SCI LTD, 2017) Sogancioglu, Merve; Yel, Esra; Ahmetli, GulnareHigh density polyethylene (HDPE) and low density polyethylene (LDPE) plastic wastes were pyrolysed in the temperature range of 300-700 degrees C, liquid, gas and solid fractions (char) were quantified and pyrolysis char was used as additive in production of epoxy composite. Effects of pyrolysis temperature on products fractions, char quality and composite quality were investigated. In the composite composition, char was included as 10-50 wt% of epoxy to determine the effects of additive dosage on the composite quality. The char additives and produced composites were characterized by FTIR and SEM. Mechanical properties, namely tensile strength, surface hardness and electrical properties were determined for the epoxy composite materials. Epoxy composite materials produced with HDPE pyrolysis char additive obtained at 300 degrees C (ER300) showed the most ideal behavior in terms of elongation at break and tensile strength. With increasing pyrolysis temperature and char doses elongation at break and tensile strength of composites generally decreased. While tensile strength showed an increase by 32% at 10% wt% dose for composite (ER300) with HDPE char obtained at 300 degrees C, the increases were 21%, 14%, 14% and 13% for ER400-ER700 composites prepared with 10 wt% HDPE chars obtained at 400-700 degrees C pyrolysis temperatures, respectively. Despite this, LDPE chars a small decreased the tensile strength of epoxy. The hardness of neat epoxy was improved from 79.8 Shore D up to 86.3 and 87 Shore D by the LDPE and HDPE char additives, respectively. The study offers a new recovery approach for HDPE and LDPE type plastic wastes. (C) 2017 Elsevier Ltd. All rights reserved.Öğe Removal of Cr (VI) in Anoxic and Sulfate-Reducing SBRs(SCIENCE PRESS BEIJING, 2011) Erdirencelebi, Dilek; Yilmazturk, Derya; Yel, EsraMicrobial uptake of Cr(VI) at 3.2-10.4 mg/L dosing pattern in weekly sequential periods was investigated under anoxic and sulfate-reducing conditions in sequential batch reactors (SBR). Cr (VI)'s fate and acute effect was also determined on nitrate and organic matter (COD) reduction of unacclimated sludge cultures with methanol as substrate. Chromium (VI) was removed at an efficient level throughout the study with adaptation signs. Chromium's inhibitory effect was not observed on nitrate reduction which reached high levels following a three week adaptation period where organic matter reduction correlated to other mechanisms than nitrate reduction was altered. A higher yield of 0.88 and a chromium removal in relation to biomass was obtained in anoxic conditions. Organic matter usage was inhibited in both SBR where sulfate reduction was altered at the maximum dosing and accumulated in the reactor.Öğe Removal of Turbidity from Travertine Processing Wastewaters by Coagulants, Flocculants and Natural Materials(SPRINGER HEIDELBERG, 2018) Onen, Vildan; Beyazyuz, Pinar; Yel, EsraThe sedimentation behaviour of travertine-processing wastewater containing a high concentration of suspended solids was investigated using different coagulation and flocculation methods. In batch experiments, four types of coagulants [FeC1(3), Al-2(SO4)(3), PACl, NaAlO2], six types of flocculants (40% MMW-40% HMW cationic, 30% MMW, 40% MMW, 40% HMW anionic and nonionic) and three types of natural materials (NMs) (sepiolite, zeolite, and pumice) were used to treat wastewater with an initial turbidity of 570-880 NTU. The optimum process conditions (dosage, mixing time/speed, sedimentation time, and pH) were investigated for each. Sedimentation performance was assessed by the effluent turbidity (T (eff)) values of the treated water. The best performances obtained were 99.3% (T (eff) = 4 NTU), 99.1% (T (eff) = 8 NTU), and 97.8% (T (eff) = 18 NTU) with 40% HMW anionic-cationic flocculants, zeolite, and FeCl3, respectively. Sludge properties, including sludge settling velocity (mm/min), sludge density (g/cm(3)), suspended solids (SS) content (mg/L), and sludge solids (%) were determined and compared under optimized conditions. The type of additive significantly affected performance. Travertine processing wastewater flocculation with polymeric materials and NMs, especially zeolite, was more favourable than coagulants in terms of both turbidity removal and sludge quality. Since zeolite is a NM, additional studies on using and recycling of the generated sludge as an industrial feedstock would be worthwhile.Öğe Sludge Using a Marble Processing Wastewater Treatment Method(DESTECH PUBLICATIONS, INC, 2014) Sogancioglu, Merve; Yel, EsraCr(VI) adsorption onto dried marble processig wastewater (non-treated wastewater) solids (MPW) and dried physicochemical marble sludge from coagulation-flocculation treatment (MPWT) of an andesite processing plant's wastewater was investigated. MPW sludge and MPWT sludge were incorpotared as inorganic adsorbents in batch reactors containing aqueous Cr(VI) solutions varying between 1 and 25 mg/L. MPWT sludge was obtained with alum coagulant. A dry particulate (powder) form of sludge samples were used at a 5 g/100 mL dosage. Isotherm studies indicated that Cr(VI) adsorption by these andesite- oriented adsorbents may be characterized using a Freundlich model for MPW sludge and a Langmuir model for MPWT sludge.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 Treatment alternatives for micropollutant removal in wastewater(Selçuk Üniversitesi Mühendislik Fakültesi, 2017) Nas, Bilgehan; Dolu, Taylan; Ateş, Havva; Argun, M. Emin; Yel, EsraPresent of micropollutants in aquatic environments has become an alarming environmental problem for both living creatures and environment. Micropollutants, also called as emerging contaminants arise from natural substances and increasing variety of anthropogenic events. Micropollutants consist of pharmaceuticals, personal care products, steroid hormones, industrial chemicals, pesticides, polyaromatic hydrocarbons and other recently seen compounds. These emerging contaminants are commonly found in very low concentration in different water bodies ranging from a few ng/l to several ?g/l. Many existing Wastewater Treatment Plants (WWTPs) in all over the world are not especially designed for removing micropollutants. Low concentration and diversity of micropollutants complicate the dedection and analysis procedures during the treatment processes. Furthermore, entering micropollutants to the WWTPs continuously and stable structure of many micropollutants make difficult to eliminate these emerging compounds sufficiently. Therefore, many micropollutants of unknown concentration pass to aquatic environment from WWTPs. The occurence of micropollutants with a significant levels in aquatic environments disrupt the aquatic ecosystems with a number of adverse effects including short-term and long-term toxicity such as endocrine disrupting effects. Besides the known negative effects of micropollutants there are great number of micropollutants whose effects on living organisms are still unknown. As a result, removing these compounds is of a great importance both to protect environmental ecosystem and human health. Considering that the conventional methods are insufficient for removing the micropollutants other alternative treatment methods including coagulation–flocculation, activated carbon adsorption (powdered activated carbon and granular activated carbon), advanced oxidation processes (AOPs), membrane processes and membrane bioreactor can be applied for better removal. In this study, alternative treatments methods and removal efficiencies of each treatment methods on different micropollutants were investigated and all alternative treatment methods were compared between each other in terms of micropollutant removal rates.Öğe Utilization of andesite processing wastewater treatment sludge as admixture in concrete mix(ELSEVIER SCI LTD, 2013) Sogancioglu, Merve; Yel, Esra; Yilmaz-Keskin, Ulku SultanThe dried physicochemical sludge from the coagulation-flocculation treatment of an andesite processing plant wastewater was used as concrete admixture in powder form. Various physicochemical sludges obtained with various coagulant/flocculants (alum, FeCl3, and sepiolite) were experienced dry particulate (powder) form of the sludge was replaced at 0.5-1.5% w/w of the cement for 250 kg/m(3) cement dosage. The admixture doses were complied with local standard. Slump tests were conducted on fresh concrete, and compressive strengths were measured for 7 and 28 days hardened concrete samples. Physical properties, namely freeze/thaw resistance, water absorption, capillary suction, void ratio and porosity were determined at the end of 28 days for the hardened concrete samples. The concrete consistency (slump) was improved up to 16-18 cm from 14.5 cm by the admixture. The best compressive strength was achieved with 0.5% w/w for admixtures. The admixture sludges obtained with organic flocculants were worse than the other admixtures. The structural changes after freeze/thaw tests were very close to the reference concrete (concrete without admixture); only the capilary suction had increased. The results confirmed that up to 0.5% of physicochemical sludge can be replaced with cement in concrete for use in certain non-load bearing structures that require medium strength concrete. (C) 2013 Elsevier Ltd. All rights reserved.
