Yazarlar
- Katipoğlu, Okan Mert(75)
- Achite, Mohammed(21)
- Kartal, Veysi(15)
- Elshaboury, Nehal(12)
- Sarıgöl, Metin(12)
- Ertugay, Neşe(9)
- Katipoglu, Okan Mert(7)
- Pande, Chaitanya Baliram(6)
- Saroughi, Mohsen(6)
- Yavuz, Emre(6)
- Aktürk, Gaye(5)
- Caglar, Bulent(5)
- Elbeltagi, Ahmed(5)
- Gürses, Ahmet(5)
- Keblouti, Mehdi(5)
- Kilinc, Huseyin Cagan(5)
- Pandey, Kusum(5)
- Samui, Pijush(5)
- Acar, Reşat(4)
- Bazrafshan, Ommolbanin(4)
- Dalkilic, Huseyin Yildirim(4)
- Dalkılıç, Hüseyin Yıldırım(4)
- Emami, Somayeh(4)
- Ertugay, Nese(4)
- Jehanzaib, Muhammad(4)
- Kocakaplan, Nihal(4)
- Malkoç, Emine(4)
- Mirzania, Ehsan(4)
- Mohammadi, Babak(4)
- Simsek, Oguz(4)
- Abdallah, Mohammed(3)
- Bailek, Nadjem(3)
- Berhail, Sabri(3)
- El Nemr, Ahmed(3)
- Güner, Eda Keleş(3)
- Karakoyun, Erkan(3)
- Ozkan, Furkan(3)
- Santos, Celso Augusto Guimarães(3)
- Sökmen, Teoman Özgür(3)
- Uzun, Sinem(3)
Yayınlar
- ArticleAçık Erişim2021Daily Flow Modeling With Random Forest and K-Nearest Neighbor Methods
Dalkılıç, Hüseyin Yıldırım; Yeşilyurt, Sefa Nur; Samui, Pijush
Water is an indispensable natural resource for life. Therefore, protection and control of water resources are of great importance. Since river flow estimation and modeling are very important in cases such as the management of water resources, irrigation, it is included in the literature as an issue that needs constant research and development. A large number of techniques are being used for estimation and modeling; thus, the estimation results are gradually improving with the development of the studies carried out, the comparison of techniques, and the determination and removal of the shortcomings. In this study, Random Forest and K-Nearest Neighbors nonlinear regression models, which are two of the machine learning methods, were used to evaluating the estimation results, to find the better estimation method, and to determine the advantages and disadvantages of these methods. In addition, Random Search and Grid Search methods were used to make the hyperparameter selection and comparison for the Random Forest model. In this study, in which daily flow data of 1981-2011 of the two stations in the Euphrates were used, and, when compared to other models, it was observed that better results were obtained when Random Search was applied to determine the hyperparameters of the Random Forest model.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Günlük Ortalama Akımların Yapay Sinir Ağları Metodu ile Taşkın Öteleme Hesabında Kullanılması
Sarıgöl, Metin
Bu çalışmada, Büyük Menderes Havzası’ndaki Menderes Nehri üzerinde yer alan E07A043 Ertuğrul ve D07A115 Yenice Regülatör Girişi Akım Gözlem İstasyonlarına (AGİ) ait günlük ortalama hidrograf verileri kullanılmıştır. Bu veriler Yapay Sinir Ağları Metodu kullanılarak eğitim ve test aşamalarından geçirilmiş, kurulan bu modele 2015 yılındaki taşkın verileri uygulanarak Taşkın Öteleme hesapları yapılmıştır. Elde edilen sonuçlar, hem ölçülmüş değerlerle hem de Yapay Sinir Ağları Metodu sonuçları ile karşılaştırılmıştır. Karşılaştırma analizinde Belirlilik Katsayısı (R2 ), Hataların Ortalama Karekökü (HOK) değerleri hesaplanmıştır. Sonuçta, günlük akım verilerinin uygulandığı Yapay Sinir Ağları Metodu ile yapılan tahmin sonuçlarının oldukça iyi sonuçlar verdiği, bir sonraki yıla ait taşkın öteleme sonuçlarının ise iyi sayılabilecek bir düzeyde olduğu tespit edilmiştir.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Investigation of Parasitic Factors in Samples Collected from Different Spring Waters in Iğdır Province
Akkaş, Önder; Ekici, Abdurrahman
Objective: It was aimed to investigate some protozoon agents\rin streams collected in Iğdır city center with different meth-\rods.\rMaterial and Methods: This study was carried out on 40 water\rsamples collected from different streams in Iğdır province center\rin April and June 2020. Water samples were taken approximately\r50 cm from the shore. These samples were first filtered through\ra vacuum pump filtration device equipped with a 0.22 μm cellu-\rlose acetate membrane filter. The filtered samples were examined\rusing the direct residue spreading method and the Modified Acid\rFast stain method.\rResults: One or more parasites were seen in 30% of 40 water\rsamples examined. 50% of these parasites were Cyclospora cay-\retanensis, 16.7% Giardia intestinalis, 33.3% Cryptosporidium spp.\rConclusion: It was concluded that rivers infected with protozoan\roocysts still pose a serious problem in terms of public health.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Evaluation of combined use of drought indices in the case of Konya Closed Basin
Dalkilic, Huseyin Yildirim; Bayçinar, Metin; Samui, Pijush
The climate covers a series of events that deeply affect human life. Today, one of the most effective of these is climate change. As drought is cited as the most important one of the consequences of climate change, it is important to examine it with various. In this study, the drought status of the study area are located statistically calculated and evaluated 4 drought indices. At the same time, factor analysis and validity-reliability analysis were conducted to test the computability of the indices used in the study as a single index and to determine the reliability of the operations. While using exploratory factor analysis, Kaiser-Meyer-Olkin (KMO) test and Bartlett test for factor analysis; Cronbach's alpha coefficient was used for reliability analysis. In our study, K-means cluster analysis method was performed to determine the cut-off values of indices. According to the cluster analysis, new clusters were created and ANOVA test was conducted to determine the difference between clusters.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2021Evaluation of the al/, cu/, si/, ag/water nanofluid effects on heat transfer characteristics in vver-1200 loaded with plutonium-thorium-based fuel
Genc, Yasin; Uzun, Sinem; Acir, Adem
This study is aimed at investigation of the potential effects of various nanoparticles used in certain properties and ratios in the coolant of VVER-1200 power plant on thermal hydraulic performance. Criticality and thermal hydraulic analysis have been performed by using MCNP and COBRA-IV/PC code, respectively. The fuel ratio has been selected as 90% ThO2 + 10% reactor grade (RG)-PuO2. Al, Cu, Si, and Ag nanoparticles in proportions of 0.01% and 0.1% by volume have been mixed with reactor coolant water. The effects of adding nanoparticles into the coolant at two different ratios on the reactor criticality, departure from nucleate boiling ratio (DNBR), and thermal hydraulic performance have been investigated. It is observed that by adding nanoparticles into the coolant, the temperature rise along the hottest channel is higher compared to the case when only water is used as the coolant, whereas the criticality and DNBR have shown a decreasing trend. It can be concluded that combination of fuel made up of 90% ThO2 + 10% RG-PuO2 and nanofluid containing 0.1% volumetric ratio of Si nanoparticle could be used in VVER-1200 nuclear power plant and this combination could contribute to augmentation of thermal efficiency of the plant.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Marsh frog (pelophylax ridibundus) as a bioindicator to assess pollution in an agricultural area
Şişman, Turgay; Keskin, Muhammet Çağrı; Dane, Hatice; Adil, Şeymanur; Geyikoğlu, Fatime; Çolak, Suat; Canpolat, Esra
In order to determine the effects of environmental contamination, nuclear abnormalities of peripheral erythrocytes and lung, liver, and kidney histopathologies were evaluated in marsh frog (Pelophylax ridibundus) in agricultural areas. The most prominent histopathological alterations observed in lung tissue were noted as epithelial hyperplasia, thickness of alveolar septa, dilatations and congestions of blood capillaries, and melanomacrophage accumulation. An increase in the number and widening of melanomacrophage centers were also noted for liver, in parallel with hepatocyte degeneration and heterogenic vascular construction originating from congestion, deformation and dilatation. In kidney, degeneration, congestion, dilatation, and necrosis in proximal and distal tubules were recorded; moreover, expansions of Bowman's space, infiltrations of lymphocytes, and glomerulonephritis were observed. Also, the frequency of nuclear abnormalities in erythrocytes showed significant differences between the sites. Quantitative analyzes of histopathological and nuclear alterations indicated that the highest effects of pollutants in frogs were at the agricultural sites in June.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Spatio-temporal analysis of meteorological and hydrological droughts in the Euphrates Basin, Turkey
Katipoglu, Okan Mert; Acar, Reşat; Şenocak, Serkan
In this study, the aim was to measure changes in the spatio-temporal distribution of a potential drought hazard area and determine the risk status of various meteorological and hydrological droughts by using the kriging, radial basis function (RBF), and inverse distance weighting (IDW) interpolation methods. With that goal, in monthly, three-month, and 12-month time periods drought indices were calculated. Spatio-temporal distributions of the droughts were determined with each drought index for the years in which the most severe droughts were experienced. According to the results, the basin is under risk of meteorological drought due to the occurrence of severe and extreme droughts in most of the area, and especially in the north, during the monthly and three-month time periods. During the 12-month period, it was found that most of the basin is under risk of hydrological drought due to the occurrence of severe and extreme droughts, especially in the southern parts. The most effective interpolation method for the prediction of meteorological and hydrological droughts was determined as kriging according to the results of the cross-validation test. It was concluded that a drought management plan should be made, and early warnings and precautions should be applied in the study area.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2021WO3 decorated TiO2 nanotube array electrode: Preparation, characterization and superior photoelectrochemical performance for rhodamine B dye degradation
Davaslıoğlu, İrem Çakar; Volkan Özdokur, K.; Koçak, Süleyman; Çırak, Çağrı; Çağlar, Bülent; Çırak, Burcu Bozkurt; Nil Ertaş, F.
An efficient photoelectrocatalyst was synthesized by electrochemical deposition of WO3 on the titanium nanotube (TNT) array by subsequent cycling the potential between -0.6 – 1.0 V vs Ag/AgCl. The structural and morphological properties of the electrode obtained (TNT-WO3) was characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopic (SEM) techniques and it was revealed that TNT surfaces were successfully decorated by WO3 species without formation of another oxidation species. Then, the photoelectrocatalytic activity of the composite electrode set at 0.2 V (vs Ag/AgCl), was tested under UV light irradiation on the degradation of Methylene blue (MB), Orange G (OG) and Rhodamine B (RhB), as the model pollutants. Among the azo dyes studied, the electrode has given the best performance against RhB in comparison to the bare TNT electrode. The influence of the deposition conditions on the efficiency was examined and under optimal conditions and it was noted that efficient removal of the dye can be achieved within 10 min. Another advantage of the composite electrode is that PEC performance can be tuned by simply changing the parameters of deposition.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Determination of heavy metals in some tissues of four fish species from the Karasu River (Erzincan, Turkey) for public consumption
Tanlr, Özge Zencir
The study aimed at determining the concentration of heavy metals in muscle, liver, and gill tissues of four fish species (Acanthobrama marmid, Capoeta umbla, Capoeta trutta and Chondrostoma regium) collected from five sites in the Karasu River, Erzincan, between July 2019 and January 2020. The relationships between fish size (length and weight) and metal concentrations in the tissues were also investigated using Pearson correlation analysis. Concentrations of Al, Fe, Cu, Mn and Zn were higher than those of other metals in all tissue samples from four fish species. Fe and Al concentrations were very high, while the lowest Co, Cd and Pb concentrations were determined in the muscle, liver and gill tissues. The results of Pearson correlation analysis showed that significant relationships between heavy metal concentrations and fish size (length and weight) were positive (p < 0.01, p < 0.05), except for a few cases. Furthermore, heavy metal concentrations in the edible parts (muscle) of the studied fish species did not exceed the maximum acceptable concentrations (MACs) proposed by national and international food standards and were safe within human consumption limits, except for Cr.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2020The Effect of the Peak Discharges of River Danube on the Strait of Istanbul (Bosphorus)
Karsavran, Yavuz; Erdik, Tarkan; Kurt, Zeynep Özge
The Strait of Istanbul (Bosphorus: SoI) is the meeting point of Black Sea and Marmara Sea. It is under influence of many hydrological, oceanographical and meteorological variables. Clearly, it is known that River Danube discharge reaches to the Sea of Marmara via SoI. The approximate distance between outlet of River Danube and northern end of the SoI is nearly 500km. In this study, the influence of the peak river Danube discharges (higher than 11000 m3 /s) on the SoI is investigated by using dataset of TAISEI Corporation, ISKI, Turkish State Meteorological Service and GRDC, Grains Research and Development Corporation. To this end, the power spectra of River Danube is calculated and compared with those of water level, surface layer water salinity and finally, surface water temperature data at the northern end of the SoI. In addition, the time series of water temperature, water salinity, and water level of the northern end of the SoI is examined together with time series of River Danube discharge between 1st Oct 2004 and 31st Sept 2005. The validation is performed by checking wind speed, air pressure and precipitation data on the SoI during that tim
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2020Prediction of daily streamflow using artificial neural networks (ANNs), wavelet neural networks (WNNs), and adaptive neuro-fuzzy inference system (ANFIS) models
Dalkiliç, Hüseyin Yildirim; Hashimi, Said Ali
In recent years, the prediction of hydrological processes for the sustainable use of water resources has been a focus of research by scientists in the field of hydrology and water resources. Therefore, in this study, the prediction of daily streamflow using the artificial neural network (ANN), wavelet neural network (WNN) and adaptive neuro-fuzzy inference system (ANFIS) models were taken into account to develop the efficiency and accuracy of the models' performances, compare their results and explain their outcomes for future study or use in hydrological processes. To validate the performance of the models, 70% (1996-2007) of the data were used to train them and 30% (2008-2011) of the data were used to test them. The estimated results of the models were evaluated by the root mean square error (RMSE), determination coefficient (R2), Nash-Sutcliffe (NS), and RMSE-observation standard deviation ratio (RSR) evaluation indexes. Although the outcomes of the models were comparable, the WNN model with RMSE= 0.700, R2 = 0.971, NS = 0.927, and RSR = 0.270 demonstrated the best performance compared to the ANN and ANFIS models.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2020Comparison of meteorological indices for drought monitoring and evaluating: A case study from euphrates basin, Turkey
Katipoglu, Okan Mert; Acar, Reşat; Şengül, Selim
Drought incidents occur due to the fact that precipitation values are below average for many years. Drought causes serious effects in many sectors, such as agriculture, economy, health, and energy. Therefore, the determination of drought and water scarcity, monitoring, management, and planning of drought and taking early measures are important issues. In order to solve these issues, the advantages and disadvantages of five different meteorological drought indices were compared, and the most effective drought index was determined for monitoring drought. Accordingly, in the monthly, 3-month, and 12-month time period, covering the years between 1966 and 2017 (52 years), Standardized Precipitation Index (SPI), Statistical Z-Score Index (ZSI), Rainfall Anomaly Index (RAI), Standardized Precipitation Evapotranspiration Index (SPEI), and Reconnaissance Drought Index (RDI) were used. It was concluded that precipitation-based SPI and ZSI are similar patterns and precipitation, and temperature-based SPEI and RDI are similar patterns. Also, it has been determined that RAI is more effective than other indices in determining the periods of extreme drought or wet. Furthermore, SPEI and RDI have been found to be superior to other indices as they take into account the water consumption and climate effects caused by evapotranspiration.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2019Erzincan İlinde Bir Yeraltı Suyu Kaynaklı Isı Pompası Sisteminin Deneysel Performans Analizi
Kaya, Mehmet Nuri; Kalkan, Orhan
Bu çalışmada, Erzincan İlinde bulunan 80 m2 taban alanına sahip bir mekân Yeraltı Suyu Kaynaklı Isı Pompası (YASKIP) ile ısıtılmıştır. Deneysel olarak gerçekleştirilen bu çalışmada ısı pompasının ve tüm sistemin enerji ve performans analizi yapılmıştır. Buharlaştırıcı su debisi, yoğunlaştırıcı su debisi ve Fan-coil hava debisi belirli değerlerde sabitlenmiştir. Daha sonra bu parametrelerden oluşan 9 farklı koşulda ölçümler alınmıştır. En yüksek değerlerin alındığı koşulda, ısı pompasının ve tüm sistemin performans katsayıları sırasıyla 4.27 ve 2.92 bulunmuştur. Bu koşulda yoğuşturucudan atılan ortalama ısı yükü 14.32 kW olarak hesaplanmıştır. Diğer yandan, yeraltı suyu kalitesi ve sıcaklığı önemli bir kriter olan YASKIP sisteminin Erzincan için uygulanabilir olduğu belirlenmiştir.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2019Erzincan İli Farklı Su Kaynaklarından Cryptosporidium spp’ nin Moleküler Yöntemlerle Tespit Edilmesi
Mor, Neriman; Yalçın, Seçil; Yildirim, Nalan
Cryptosporidium son 30 yıldan beri insan ve birçok hayvan türünde önemli enterik protozoon patojen olarakkabul edilmektedir. Su ise Cryptosporidium’ un taşınmasında en önemli araçlardan biri olarak görülmektedir.Bu nedenle günümüzde Cryptosporidium içme sularında kontrol edilmesi gereken yeni ve en önemlikontaminantlardan biri haline gelmiştir. Buna dayanarak yapılan bu çalışmada Erzincan iline bağlı ilçe veköylerden 2016 yılı Mart ve Ağustos ayları arasında, 6 ay boyunca topam 140 farklı noktadan içme ve kullanmasuyu örneği toplanmıştır. Toplanan örneklere PCR ve LAMP tekniği uygulanmıştır. PCR ile toplananörneklerden 6’ sı (% 4,3) pozitif sonuç verirken, LAMP ile 9’ u (% 6,4 ) Cryptosporidium spp. açısından pozitifolarak bulunmuştur. Çalışmamız sonucunda elde edilen veriler ile geçim kaynağı tarım ve hayvancılık olanErzincan ilinin sularındaki bu kirliliğe, enfekte hayvan dışkılarının çevreye bırakılması ve tarımda kullanılanatık suların çevresel sular aracılığı ile su kaynaklarına ulaşmasından kaynaklandığı,yağan yağmur ve nemlihavanın, içme suyu ve çevresel sularda kontaminasyonu arttırdığı düşünülmektedir.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2019Determination of some metal levels in water, sediment and fish species of tercan dam lake, Turkey
Güneş, M.; Sökmen, T.Ö.; Kirici, M.
This study aimed to determine the metal (Al, As, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) levels in the gill, liver, and muscle tissues of some fish species, water and sediment samples taken from Tercan Dam Lake (Erzincan, Turkey). Initially, some physico-chemical parameters of the water such as temperature, pH, and dissolved oxygen were measured, and the relationship was determined between these parameters and the metal levels detected in the water. According to the analysis conducted on the water and the sediment, the most frequent metal was determined to be Fe. During the analyses conducted in the water, Pb and Zn metals were not detected, and all metals were detected in the sediment. It was determined that metals accumulated to a higher degree in the liver and gill tissues compared to muscle tissues. The harmfulness of the metal amounts determined in the water, sediment, and fish tissues was evaluated by comparing them to the acceptable values determined by national and international institutions.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2019Voltammetric detection of chlorite ion using carbon paste sensor modified with N-cetylpyridinium–bentonite
Cubuk, Osman; Colak, Isıl; Özdokur, Kemal Volkan; Caglar, Bulent; Coldur, Fatih; Topcu, Cihan
A voltammetric carbon paste sensor (CPS) was described for the detection of chlorite ion in water analysis. For the construction of the voltammetric CPS, organo-bentonites were synthesised by intercalation of N-cetylpyridinium (NCP) at different amounts into interlayer gap of bentonite. Some features of the obtained organo-bentonites such as structural, thermal and morphological were investigated by using various techniques. Afterwards, the voltammetric behaviour of the (Formula presented.) solution was investigated with cyclic voltammetry in the potential range of 0.0–1.0 V at a scan rate of 50 mV s−1 based on the obtained organo-bentonites as electroactive material. The characterisation of the prepared organo-bentonites as electroactive material, the effect of the amount of NCP–bentonite (NCP–B) in modified CPS on the 10.0 mM CIO2- response was tested by chancing the percentage of NCP–B in the range of 2.50–12.50% under identical experimental conditions. The pH of the measurement cell was optimised by using 0.04 M Britton–Robinson buffer in the range of pH 2.0–12.0. Under the optimised conditions, developed sensor exhibited a linear response in the range of 2.0 × 10−5 to 2.0 × 10−4 M chlorite ions concentrations. The detection limit and the limit of quantification were figured out as 6.0 × 10−6 and 2.0 × 10−5 M, respectively. The repeatability and reproducibility of the sensor were calculated as 5.0% and 6.8% (N = 5), respectively. Finally, the sensor was successfully applied for the analysis of bottled water, and the mean recovery was found as 103 ± 3%.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2018Determination of Heavy Metal Levels in Water, Sediment and Capoeta umbla Tissues of Karasu River (Erzincan)
Sökmen, Teoman Özgür; Güneş, Muharrem; Kirici, Muammer
In this study, it was aimed to determine the accumulation levels of some metals (Aluminum (Al), Arsenic (As), Chromium (Cr), Copper (Cu), Ferrois (Fe), Manganese (Mn), Nickel (Ni), Lead (Pb) and Zinc (Zn)) in the muscle, liver and gill tissues of the Capoeta umbla fishes caught in the water, sediment and riverbed of Karasu River. For this purpose, water temperature, pH and dissolved oxygen values were measured. As a result of water analysis, the maximum amount of As was measured, but Al, Fe, Pb and Zn metals could not be detected in water. However, the relationship between the metals detected in water and the measured temperature, pH and dissolved oxygen values in water were compared. As a result of the sediment analysis, the highest accumulation was measured in Fe metal, whereas Al, Cu and Mn metals were not detected. In fish tissues, accumulation of all metals was detected. It has been determined that metals generally accumulate more in the liver tissue than other tissues. While the maximum accumulation in all tissues was measured in Fe metal, the lowest accumulation in all tissues was seen in Pb metal. In addition, the relationship between the metal levels detected in fish and the weight and length of fish was investigated. The quantities of metals identified in water, sediment and fish tissues have been compared with acceptable values determined by national and international agencies and assessed whether they are detrimental to the health of humans or aquatic organisms.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2018Investigation of the Effects of Air Conditioner Waste Water on Wheat and Barley
Osma, Etem; Elveren, Müjgan; Varol, Tuğçe
Herein this study, the effects of the wastewaters that transmitted to the ecosystem from the air conditioner on the barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.) plants were investigated. The soil to be planted for study was mixed at different concentrations (1/5, 2/5, 3/5) of the air conditioner wastewater except for the control group. On 650 g of soil 5 g of barley and 7 g of wheat seed were planted and covered with 100 g of soil. Wheat was irrigated at regular intervals in accordance with field capacity. The wheat was harvested after 15 days and the barley was harvested after 11 days. After weighing the harvested samples electrolyte leakage, MDA, CAT, SOD activities were determined by extraction. Along with that wheat and barley specimens were analyzed for metal concentrations in ICP-OES after pre-treatment. The relationship between control samples and samples grown at different concentrations of A/C wastewater was evaluated statistically and significant differences were determined.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2018The degradation of landfill leachate in the presence of different catalysts by sonolytic and sonocatalytic processes
Kocakaplan, Nihal; Ertugay, Neşe; Malkoç, Emine
In the study, the degradation of landfill leachate by single ultrasound (sonolytic) and sonolytic combined with Fe2+ and TiO2 catalysts was carried out in laboratory conditions. The effect of pH and ultrasonic wave amplitude was also investigated in terms of color removal, total organic carbon (TOC) and chemical oxygen demand (COD) from leachate by the sonolytic degradation process. In this process, the color removal efficiency was recorded as 81.81% at 620 nm, pH = 2.0 and 70% wave amplitude. The sonocatalytic degradation of landfill leachate accompanied by different catalysts was studied by using the 70% wave amplitude at pH = 2.0 and room temperature for 20 min. The sonocatalytic degradation of leachate by using Fe2+ and TiO2 was found to be significantly higher than sonolytic degradation (p < 0.05). As the Fe2+ concentration increased from 1.0 to 3.0 mg/L, the COD and color removal of leachate significantly decreased (p < 0.05) from 50 to 35.7% and from 95.5 to 90.9%, respectively. The experimental data obtained from sonocatalytic degradation was analyzed using the Behnajady–Modirshahla–Ghanbery (BMG) kinetic models and found to be compatible. The results showed that the combination of catalyst and sonolysis was a highly effective way to remove color, COD and TOC from landfill leachate.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2017The Effect of ZVI and H2O2 Concentrations on Chemical Oxygen Demand and Color Removal With Fenton-Like Process From Leachate
Ertugay, Nese; Kocakaplan, Nihal; Malkoç, Emine
Leachate are difficult to treat due to their complex structures and having high pollutants concentrations. In this study; color and chemical oxygen demand (COD) removal were studied from the leachate by Fenton-like oxidation. The effect of zero -valent iron (ZVI) and H2O2 concentrations on color and COD removal was investigated. The color removal was conducted at three different wavelengths of 436, 525 and 620 nm, respectively. The highest COD (74.4%) and color removal (71% at 436 nm, 80.3% at 525 nm and 87.9% at 620 nm) were determined at concentration of 0.05 g/L ZVI. Increasing of H2O2 concentration up to 200 mg/L also increased color and COD removal. Optimum values were 0.05 g/L and 150 mg/L for ZVI and H2O2 at a reaction time of 20 minutes and pH=2.0 and total organic carbon (TOC) removal was also determined at about 50%.
RDL Kalıcı Kaydıİncele
