Yazarlar
- Yildirim, Numan(27)
- Tanyol, Mehtap(21)
- Topal, Murat(19)
- Kutlu, Banu(18)
- Yildirim, Nuran Cikcikoglu(17)
- Ince, Muharrem(16)
- Serdar, Osman(16)
- Erguven, Gokhan Onder(14)
- Öbek, Erdal(14)
- Danabas, Durali(13)
- Acar, Ramazan(11)
- Demir, Veysel(11)
- Arslan Topal, E. Işıl(8)
- Ogedey, Aysenur(8)
- Yonten, Vahap(8)
- Tatar, Sule(7)
- Ince, Olcay Kaplan(6)
- Aksu, Onder(5)
- Alp, Hevidar(5)
- Ates, Mehmet(5)
- Korkmaz, Volkan(5)
- Oguz, Ensar(5)
- Topal, E.Işıl Arslan(5)
- Ural, Mesut(5)
- Arslan, Zikri(4)
- Aslan, Naim(4)
- Can, Erkan(4)
- Demirbilek, Deniz(4)
- Goksu, Ali(4)
- Kocabaş, Mehmet(4)
- Korkmaz, Meral(4)
- Kurnaz Yetim, Nurdan(4)
- Lassabatere, Laurent(4)
- Mutlu, Ekrem(4)
- Yilmaz, Deniz(4)
- Akkurt, Nevzat(3)
- Angulo-Jaramillo, Rafael(3)
- Arslan Topal, E.I.(3)
- Aydın, Ayşe Nur(3)
- Camas, Mustafa(3)
Yayınlar
- MakaleYalnız künye2020Scopus SJRQ4Metal bioaccumulation in selected tissues of barb (Barbus sp.) and common carp (Cyprinus carpio, Linnaeus 1758) from the Keban Dam Lake, Turkey
Danabas, Durali; Kutluyer, Filiz; Ural, Mesut; Kocabaş, Mehmet
The aquatic life has been negatively influenced by harmful effects of environmental toxic elements, including heavy metals. The elevated concentrations of metals may be harmful for aquatic animals and human health. Herein, the present study deals with assessment of the bioavailability of metals [cadmium (Cd), chrome (Cr), copper (Cu), zinc (Zn), iron (Fe), lead (Pb), manganese (Mn), mercury (Hg), nickel (Ni), and selenium (Se)] in organs such as muscle, gills, liver, kidney, and gonad of the commercially consumed Barbus sp. and Cyprinus carpio (Linnaeus, 1758) collected from Keban Dam Lake, eastern Turkey. The fish were captured from four different stations of Keban Dam Lake. Our results indicated that Fe and Zn concentrations were the highest in all tissues of two fish species while Cd concentrations were the lowest levels. In addition, detected metals accumulated in the muscle of common carp at higher levels compared to Barbus sp. The results from the present study also demonstrated significant variations and considerable differences in the concentrations of all 10 elements between the four stations and different fish tissues. Overall, the concentrations of detected metals in the muscle were many folds higher than the permissible level prescribed by some national and international legislation, which raises health risk concerns.
AtıfScopus11WoS9OpenAlex14
İncele - MakaleYalnız künye2020Scopus SJRQ2Temporal and seasonal variations in phytoplankton community structure in Uzuncayir Dam Lake (Tunceli, Turkey)
Kutlu, Banu; Aydın, Rahmi; Danabas, Durali; Serdar, Osman
Seasonal variations in species composition and growth dynamics of phytoplankton in Uzuncayir Dam Lake (Tunceli, Turkey) were studied in relation to ecological factors by collecting horizontal water and phytoplankton samples for over a year. A total of 46 phytoplankton taxa were recorded, where Bacillariophyta was the most abundant in species number representing 24 taxa. Diatoms were the most conspicuous phytoplankton in terms of abundance as well as occurrence frequency. Charophyta, Chlorophyta, Cyanobacteria, Ochrophyta, Miozoa, and Euglenozoa were the least abundant. However, some Diatoms (Gyrosigma attenuatum, Hippodonta hungarica, Meridion circulare, Nitzschia clausii, Nitzschia frustulum, Pantocsekiella ocellata, Rhoicosphenia abbreviata), Charophytes (Cosmarium granatum, Mougeotiopsis calospora), Cyanobacteria (Leiblenia epiphytica, Planktothrix agardhii); Dinoflagellates (Ceratium hirundinella, Parvodinium africanum, Parvodinium inconspicuum, Peridinium cinctum), and Ochrophyta (Dinobryon pediforme) were also noticeable, with their occurrence in all seasons. Canonical correspondence analysis (CCA) and principal component analysis (PCA) were employed to analyze the relationship between occurrence and abundance of phytoplankton species as well as the ecological factors. The results showed that pH and the concentrations of NH4, NO3, and PO4 influenced seasonal occurrence and abundance of phytoplankton species in the lake. Uzuncayir Dam Lake may be classified as an oligotrophic lake with the mean value of nitrate 2.62 mg L−1 and phosphate 0.23 mg L−1 as supported by the occurrence of various phytoplankton groups. Findings related to pollution indices yielded that Uzuncayir Dam Lake is on the edge of the moderate state of organic pollution.
AtıfScopus26WoS15OpenAlex23
İncele - MakaleYalnız künye2020Scopus SJRQ1Structural and catalytic properties of Fe3O4doped Bi2S3novel magnetic nanocomposites: P-Nitrophenol case
Kurnaz Yetim, Nurdan; Aslan, Naim; Koç, Mumin Mehmet
Catalytic properties of Bi2S3 nanostructures, Fe3O4 nanoparticles and novel Bi2S3@Fe3O4 magnetic nanocomposites were investigated. Flower-like Bi2S3 nanostructures were produced using hydrothermal synthesis. Bi2S3 nanostructures were doped with Fe3O4 nanoparticles where Bi2S3@Fe3O4 novel magnetic nanocomposites was obtained. Structural characterization of the nanoflowers were performed using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Microscopic characterization of the nanoflowers was performed using electron microscopy where scanning electron microscope (SEM) and transmission electron microscope (TEM) were used in the characterization which confirms the flower like structures. Vibrating sample magnetometry (VSM) confirmed the magnetic properties of the ferromagnetic characteristics of the magnetic nanocomposites. Optic properties of the nanoparticles were assessed using Ultraviolet - visible (UV-vis) spectroscopy. Band gap energies of the Bi2S3, Fe3O4 and Bi2S3@Fe3O4 were found to be 1.80 eV, 2.0 eV and 2.72 eV, respectively. Catalytic properties of the Bi2S3@Fe3O4 nanoparticles were confirmed using UV spectroscopy where reduction of p-nitrophenol to p-aminophenol was assessed in the presence of NaBH4. It was concluded that Bi2S3 nanostructures and Bi2S3@Fe3O4 nanocomposites showed better catalytic performance than that of Fe3O4 nanoparticles. Such a case was attributed to increased surface area - volume ratio. Results indicate that nanocomposites have the potential to be used in the wastewater treatment.
AtıfScopus55WoS55OpenAlex56İncele - MakaleYayıncıda açık erişim2020Scopus SJRQ4Bioremediation of fluazifop-p-butyl herbicide by some soil bacteria isolated from various regions of Turkey in an artificial agricultural field
Erguven, Gokhan Onder; Nuhoglu, Yasar
The bioremediation rate of fluazifop-p-butyl (C19H20F3NO4) was monitored. Bacteria were isolated in agricultural soil samples. Fifteen sterilised glass jars were inoculated with 2, 5, 10, 20 cm3 of a homogenised bacterial mixture (109 CFU/cm3), then sterile agricultural soil and 60 µg of fluazifop-p-butyl (in liquid form) were added to each jar. Each week, filtrated water drained from bottles was analysed for fluazifop-p-butyl concentration, chemical oxygen demand (COD), biochemical oxygen demand (BOD5) and total organic carbon (TOC). Additionally, pH and dissolved oxygen concentration were monitored. The highest biodegradation rate was observed in the soil sample containing 20 cm3 of the culture media. In this media, fluazifop-p-butyl, COD, BOD5 and TOC removals were measured as 91, 83, 96 and 86%, respectively, at the end of the 2 months. The DO level was measured between 3 and 6 mg O2/dm3 in the first month for all cultures. An increase of pH was recorded during the first month and after this time a pH decrease was noted.
AtıfScopus5WoS5OpenAlex4İncele - Kitap BölümüYalnız künye2020Microbial release of exopolymeric substances and their role in removal of pollutants from wastewater
Işıl Arslan Topal, E.; Topal, Murat
Activated sludge samples were seasonally collected from the aeration tanks of the Municipal Wastewater Treatment Plant located in Elazığ city (Turkey). Mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), total solids (TS), suspended solids (SS), volatile solids (VS), chemical oxygen demand (COD), and sludge volume index (SVI) of the activated sludge were seasonally monitored in the treatment plant. Exopolymeric substances (EPS) were extracted in the samples collected. The EPS decreased in summer, while the EPS content was the highest in winter. The TB-EPS part of EPS was higher than the LB-EPS part of the EPS in all seasons. The lowest TB-EPS and LB-EPS were determined in summer, while the highest TB-EPS and LB-EPS were determined in winter. The carbohydrate, protein, and humic substance fractions of TB-EPS and LB-EPS followed the order of protein > carbohydrate > humic substance in all seasons. There was a negative correlation between the EPS content and SVI. The relationships between EPS and the removal efficiencies of TS, SS, and VS were quite low, while the relationship between COD removal and EPS was quite high.
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2019Examination Water Quality of Karkamış Dam Lake
Tepe, Rıdvan; Kutlu, Banu
This study was conducted in order to reveal the physico-chemical properties of the Karkamis Dam Lake located within the boundaries of Sanliurfa and Gaziantep, water samples were taken from 5 stations at 4 and 8 m depths between January and December 2015. Temperature, pH, dissolved oxygen, electrical conductivity, ammonium nitrogen, nitrate nitrogen, ortho phosphate, phosphorus, total nitrogen and total phosphorus values of water were measured during the year. The detected values were found as temperature (14.3-21.6°C average: 9.4), pH (8.4-9.1-7.8), dissolved oxygen (9-10-11.8 mg L-1 ), electrical conductivity (251-332-412 ,00S cm-1 ) ammonium nitrogen (0,003-0,069-0,194 mg L-1 ), nitrate nitrogen (1,549-2,292-3,473 mg N L-1 ), nitrite nitrogen (0.001-0.006-0.053 mg L-1), ortho phosphate phosphorus (0.007-0.034-0.076 mg L-1 ), total nitrogen (0.722-1.1514-1.696 mg L-1 ), total phosphorus (0.007-0.016-0.026 mg L-1 ). The Karkamis Dam Lake has a Class I high quality water class according to the Quality Criteria for Inland Water Resources Classification according to the Surface Water Quality Management Regulation.
AtıfOpenAlex8TR Dizin9
İncele - MakaleYalnız künye2019Scopus SJRQ2Modelling cadmium bioaccumulation in Gammarus pulex by using experimental design approach
Serdar, Osman; Pala, Aysegul; Ince, Muharrem; Onal, Ali
Recently, although dynamic approaches have been used increasingly to describe metal bioaccumulation in aquatic organisms, the validation of such laboratory-derived modelling is rarely assessed under environmental conditions. The present study aims to evaluate and verify statistical and mathematical models for the bioaccumulation of cadmium (Cd) and to evaluate the suitability of Gammarus pulex as a biomonitor for Cd. To optimise Cd2+ ion bioaccumulation conditions a Box–Behnken design was used and whether G. pulex can be used as an estimated tool to assess aquatic quality was investigated. A Box–Behnken experimental design combined with response surface modelling (RSM) was employed for Cd2+ bioaccumulation in G. pulex. Independent variables including temperature, contact time and Cd2+ ion concentration significance and their interactions were tested using analysis of variance. The selected variables’ optimum values were obtained by solving the quadratic regression model along with by analysing the response surface contour plots. Based on Box–Behnken design, the applied model is significant because model F-value and R2 were obtained as 5121.49, 0.9998, respectively. Bioaccumulation of Cd amount was analysed using electrothermal atomic absorption spectrophotometer. The obtained data suggest that G. pulex can be evaluated as Cd biomonitor.
AtıfScopus3WoS3OpenAlex6İncele - MakaleYalnız künye2019Scopus SJRQ2Gammarus pulex as a Model Organism to Assess the Residual Toxicity of Slaughterhouse Wastewater Treated by Electrocoagulation Process
Yildirim, Nuran Cikcikoglu; Tanyol, Mehtap; Serdar, Osman; Yildirim, Numan
It was assessed the efficiency of the electrocoagulation (EC) in slaughterhouse wastewater (SW) treatment by using antioxidant parameters of Gammarus pulex. The SW was treated by EC. Superoxide dismutase (SOD), glutathione peroxidase (GPx) and catalase (CAT) activities and malondialdehyde (MDA) levels in G. pulex exposed to pre- and post-treated of the SW during 24 h and 96 h were analysed. Standard methods were applied during the analysing process of the physicochemical quality parameters for both untreated and treated SW. All measured physicochemical parameters were decreased following the treatment process via EC. After the treatment process, it was observed that while SOD activities and MDA levels were decreased, CAT activities were increased and GPx activities did not exhibit any change. In conclusion, the present study demonstrated the abilities of untreated SW to promote oxidative stress in model organism. The SOD, CAT activities and MDA levels in G. pulex revealed that EC process were efficient in the SW treatment.
AtıfScopus10WoS9OpenAlex13İncele - MakaleYalnız künye2019Scopus SJRQ1Assessment of hydraulic properties of technosols using Beerkan and multiple tension disc infiltration methods
Yilmaz, Deniz; Bouarafa, Sofia; Peyneau, Pierre-Emmanuel; Angulo-Jaramillo, Rafael; Lassabatere, Laurent
The increasing global urban sprawl requires large amounts of materials, putting huge pressure on numerous natural resources. In particular, vast quantities of soils are used to create infrastructures or green spaces associated with new developments. Alternative solutions aimed at alleviating soil consumption are thus being encouraged. Creating urban soils by recycling waste from industrial and construction activities is feasible, but apart from their support function the resulting technosols should also be able to provide some ecosystem services such as the capacity to infiltrate water and filter contaminants. Various methods are routinely used for in situ characterization of the hydraulic behaviour of natural soils, but their ability to assess the hydraulic properties of technosols remains unclear. Indeed, technosols formed from recycled waste differ markedly from natural soil because they often contain a considerable proportion of coarse artefacts that affect their structure. In this study, results obtained by two distinct methods (ponding and tension infiltrometry), associated with two data processing methods (Beerkan estimation soil transfer (BEST) and numerical inversion), on a set of infiltration data measured on experimental plots made of technosols have been compared with each other. Both methods provided similar results and thus proved to be reliable when applied to technosols. Highlights: Reuse of by-products from anthropogenic activities is crucial to alleviate the consumption of natural soil. Hydraulic properties of technosols must be monitored to assess some of the ecosystem services they can provide. BEST and numerical inversion of multiple tension disc infiltration data gave consistent results. Reliability of the hydraulic characterization methods used for technosols deserves further inquiry.
AtıfScopus10WoS10OpenAlex12İncele - MakaleYalnız künye2019Scopus SJRQ2Phanerochaete chrysosporium as a model organism to assess the toxicity of municipal landfill leachate from Elazığ, Turkey
Yildirim, Numan; Yildirim, Nuran Cikcikoglu; Tatar, Sule; Alp, Hevidar
In order to evaluate the potential ecological risk and the toxic effect of landfill leachate (LL), Phanerochaete chrysosporium was exposed to LL and their biochemical response was observed by using antioxidant parameters. Phanerochaete chrysosporium, ME 446, was kept at 4 °C after being sub-cultured at 28 °C on Sabouraud Dextrose Agar (SDA). Superoxide dismutase (SOD), catalase (CAT) activities, and malaondialdehyde (MDA) and glutathione (GSH) levels of P. chrysosporium exposed to different dilution rates of leachate (1/10 and 1/20) for 24 and 96 h were analyzed by using the ELISA method. The physiochemical parameters such as pH, conductivity, total dissolved solids (TDS), dissolved oxygen (DO), chemical oxygen demand (COD) of leachate, and reference water were analyzed by using the YSI Professional Plus handheld multiparameter meter. In this study, SOD activities were decreased in the application groups compared with the Control Group at the 24th and 96th hours. CAT activities and GSH levels increased in the application groups compared with the Control Group at the 24th hour but decreased at the 96th hours. MDA levels increased in all of the application groups when compared with the Control Group for both 24 and 96 h. Different concentration of LL induces oxidative stress in P. chrysosporium, increased CAT activity and MDA levels, and decreased SOD activity and GSH levels.
AtıfScopus7WoS5OpenAlex6İncele - MakaleAçık Erişim2019Scopus SJRQ3Possible indices for the assessment of ecological stream quality based on macroinvertebrates in Euphrates tributaries (Turkey)
Gültekin, Zuhal; Hellmann, Claudia; Aydin, Rahmi; Winkelmann, Carola
The aim of this study was to support the development of ecological stream quality assessment tools in order to provide a method for sustainable water management in Turkey. Therefore, we present two new or adapted indices based on benthic invertebrates. To develop and adapt the indices, 17 streams were studied and separated into three quality classes, which were supported by four community indices (EPT [%], EPTCBO [%], number of Individuals, evenness), and 23 taxa were identified as indicators for these three quality classes. As a first biological index, we adapted the Hindu Kush-Himalaya biotic score (HKHbios) to the Euphrates catchment by establishing a new and ecoregion-specific score list (Euph-Scores) by scoring 93 taxa depending on their distribution between the quality classes. Based on these scores, several average score per taxon values (ASPT value) were calculated. All ASPT values of the Euph-Scores separated the quality classes significantly. After a comparison of the different ASPT values we recommend to use the weighted ASPT, because the weighting enabled a sharper differentiation between the quality classes and named it Euphrates Biotic Score (EUPHbios). As a second biological index, we propose the proportion of habitat specialists. To calculate this index, a habitat score was developed by analysing the habitat preferences of several benthic invertebrates. Habitat score values were assigned to the 20 most common taxa from the streams in the best quality class (natural streams). The proportion of habitat specialists, identified using the new habitat score, differed significantly between the three quality classes, with higher values in natural streams than in polluted streams. In the light of the results, the presented methods appear to be suitable for developing a multi-metric index for assessment programs for the mountainous regions of the Middle East.
AtıfScopus8OpenAlex10İncele - MakaleYalnız künye2019Monitoring of Zn and Cr in downstream water from uzunçayir dam in Turkey
Topal, M.; Arslan Topal, E.I.
In this study, the concentrations of Zn and Cr in downstream waters from Uzunçayir Dam (Tunceli, Turkey) were monitored during spring (March, April, May) and summer (June, July, August) season. Zinc and Cr concentrations in surface water samples were detected using the ICP-MS device. According to the data obtained the lowest Zn and Cr concentrations in the spring season were 65.43±3.2 μg/L in March at 10th day for Zn and 0.28±0.02 μg/L in March at 10th and 20th day for Cr, the highest Zn and Cr concentrations were determined to be 83.12±4.1 μg/L in May at day 30 for Zn and 0.48±0.02 μg/L in May at day 30 for Cr. The lowest Zn and Cr concentrations in summer season were 55.48±2.7 μg/L at 30th day in August for Zn and 0.54±0.03 μg/L at 10th day in June for Cr. The highest Zn and Cr concentration in summer season were found as 69.48±3.5 μg/L in June at day 10 for Zn and 1.23±0.06 μg/L in August at day 30 for Cr. The Zn and Cr concentrations in the downstream of Uzunçayir Dam were found to be smaller than the Zn and Cr concentrations given by the Surface Water Quality Regulation (SWQR). As a result, it was determined that there was no harm in using water from the Uzunçayir Dam as irrigation water or drinking water in terms of Zn and Cr concentrations.
AtıfScopus2OpenAlex2İncele - MakaleYalnız künye2019Scopus SJRQ2The Evaluation of Imidacloprid Remediation in Soil Media by Two Bacterial Strains
Erguven, Gokhan Onder; Yildirim, Numan
Imidacloprid (C9H10ClN5O2) is used as the most recommended type of insecticide in vegetable farming worldwide. Two types of bacteria (Methylobacterium radiotolerans and Microbacterium arthrosphaerae) were isolated from a corn farming field in the Thrace region of Turkey, and then consortia of these bacteria were prepared from equal volumes of 107 CFU/ml for each bacterium type. Imidacloprid remediation studies were carried out during 18 days in soil test units. The water filtered from these soil test units was determined for chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) to determine the optimum concentration of microorganisms to ascertain the best removal efficiency of Imidacloprid. COD removal rates were 98.7%, 96.4% and 51.6% with 80, 40, and 20 ml volumes of the consortia of bacteria, respectively, at the end of 18 days. The BOD5 removal rates were 88.4%, 78.6% and 49.9% in the same volumes of bacteria, respectively. As a result of this study, we have found that this bacterial consortium is very effective for the bioremediation of this insecticide at the two volumes of 40 and 80 ml, both being better than 20 ml.
AtıfScopus35WoS34OpenAlex37İncele - MakaleYalnız künye2019Uptake of some elements with aquatic plants exposed to the effluent of wastewater treatment plant
Tatar, S.; Öbek, E.; Arslan Topal, E.I.; Topal, M.
In this study, in the removal of macro (P, S, Na, K, Ca, Mg) and micro (Sb, Ba, Co, Cu, Fe, Pb, Mn, Hg, Mo, Se, Ag, Zn) elements in the effluent of Elazig Wastewater Treatment Plant, the efficiency of Lemna minor L. and Lemna gibba L. has been studied comparatively. For this aim, fronds of these plants have been adapted to the effluent of the treatment plant that feeds pilot scale reactors. The concentrations of elements in fronds harvested during the working period were analyzed by ICP/MS. The analytical results show that Lemna minor L. has a high accumulation potential for P, Sb, Ba, Co, Fe, Pb, Mn, Hg, Ag and Zn while Lemna gibba L. has a high accumulation potential for S, Na, Ca, Mg, Cu, Mo and Se. The results show that Lemna minor L. and Lemna gibba L. can be used as phytoremediators of wastewater.
AtıfScopus10OpenAlex6İncele - MakaleAçık Erişim2018Water Quality Chance and The Variation of the Algal Flora of The Munzur River (Tunceli-Turkey)
Kutlu, Banu; Demir, Burcu
Phytoplankton distribution and physico-chemical parameters in two stations in Munzur River were determined in the study carried out monthly between February 2015 and January 2016. According to water quality regulation of the supreme, while quality of water is first class property for temperature, pH, oxygen, ammonium nitrate. It is class feature. Also II. The station is in danger of organic pollution due to domestic waste. When the phytoplankton distribution in the region is examined; 84 taxa belonging phytoplankton Chlorophyta (6), Bacillariophyta (54), Cyanobacteria (15), Rhodophyta (1), Ochrophyta (1), Euglenophyta (2), Charophyta (3), Miozoa (2) were detected. In terms of organisms in the phytoplankton Bacillariophyta division was dominant and Cyanobacteria division was subdominant in the two stations. In the phytoplankton, Ulnaria ulna from Bacillariophyta, Nitzschia palea, Bacillaria paradoxa ,Encyonema sp., Navicula sp. and Nitzschia acicularis were mostly found. Lyngbya sp., Spirulina labyrinthiformis, Oscillatoria labyrinthiformis and Oscillatoria mougeotii species beloning to cyanobacteria match to second place in the terms of importance. Chlorophyta, Charophyta and Euglenophyta have not reached important numbers.
- MakaleAçık Erişim2018Assessment of metal concentrations and physicochemical parameters in the waters of Lake Tecer
Mutlu, Ekrem; Kutlu, Banu; Demir, Tugba; Yanik, Telat
Aim of the study: The objectives of this study are to observe the monthly and annual changes in water samples using physical-chemical methods in order to determine the water quality properties, to reveal pollution problems, to determine the suitability of water quality for aquatic life and to classify the quality of water in accordance with the Surface Water Quality Management Regulation's Inland Surface Water Classes criteria. Area of the study: Lake Tecer is located in the southeastern area of Sivas city and at the end of Brook Tecer, a branch of the Kizilirmak. The lake has a mean depth of 2.4 m and is fed by surface waters and snowmelt. Material and methods: The study period was from March 2011 to February 2012. Samples analysed for several chemical and physical parameters representing water quality were collected monthly over a period of 12 months. Main results: It was observed that the condition of the lake in terms of water quality is good. According to the Classification of the Intra-Continental Water Resources in the WPCR, the lake shows Class I, II and III water quality characteristics. Research highlights: In order to protect the water quality of this water source, to reduce further pollution and to sustain the natural ecological balance consisting of natural fish stocks and other aquatic animals, this lake should be monitored continuously.
AtıfWoS6OpenAlex11TR Dizin5İncele - MakaleYalnız künye2018Scopus SJRQ3Kinetics behavior of methylene blue onto agricultural waste
Sarici-Özdemir, Cigdem; Kiliç, Fatih
In the present work, investigations on a potential use of agricultural waste for the removal of methylene blue (MB) from wastewater are presented. Adsorption kinetics of MB has been studied using reaction-based and diffusion-based models. Three kinetic models, namely pseudo-first-order, pseudo-second-order, and the Elovich are analyzed at the temperature of 298 K for the reaction-based model. The kinetic studies showed that the data were well described by the pseudo-second-order kinetic model. Intraparticle diffusion, external-film diffusion, and internal-pore diffusion models characterizing MB were obtained. The results suggested that the agricultural waste has a high potential to be used as an effective adsorbent for MB adsorption. Pseudo-first-order, pseudo-second-order, and the Elovich models were employed to describe the desorption mechanism. The experimental results showed that the pseudo-second-order equation is the best model.
AtıfWoS22OpenAlex23İncele - MakaleYalnız künye2018Scopus SJRQ1Antioxidant biomarkers in Gammarus pulex to evaluate the efficiency of electrocoagulation process in landfill leachate treatment
Serdar, Osman; Yildirim, Nuran Cikcikoglu; Tatar, Sule; Yildirim, Numan; Ogedey, Aysenur
The discharge of landfill leachate into the environment without effective treatment poses a serious threat for the aquatic ecosystems. This present study was undertaken to evaluate whether electrocoagulation process is efficient for treatment landfill leachate (LL) or not by using antioxidant biomarkers in Gammarus pulex. Glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), and catalase (CAT) activities and malondialdehyde (MDA) and glutathione (GSH) levels in G. pulex exposed to untreated, treated, and diluted rates 1/10 and 1/20 in both LL during 24 and 96 h were tested. Physiochemical characteristics of leachate (chemical oxygen demand, electrical conductivity, pH, phosphate, turbidity, NH3, Cl−, and color) were determined pre and post treatment. All physiochemical characteristics of LL decreased after treatment process. GSH-Px and CAT activities and GSH and MDA levels were increased in untreated groups when compared to control (p < 0.05). After treatment by electrocoagulation, MDA and GSH levels and CAT activities were returned to control values. In conclusion, the abilities of LL to stimulate oxidative stress in G. pulex have been proven. The results revealed that antioxidant parameters are useful biomarkers for determining the treatment efficiency of the electrocoagulation process.
AtıfScopus19WoS17OpenAlex23İncele - MakaleAçık Erişim2018Scopus SJRQ2A research on coliform bacteria in the golden Horn Estuary (Sea of Marmara, Turkey)
Karabas, Necati; Tas, Seyfettin; Erguven, Gokhan Onder; Bayhan, Hurrem
Spatio-temporal variation of the total and fecal coliform groups as bacteriological indicators in the marine environment was investigated in surface water of the Golden Horn Estuary in monthly intervals between June 2012 and May 2013. Temperature, salinity, Secchi depth, pH, dissolved oxygen and oxygen saturation were measured at 10 stations simultaneously with bacteriological analyses. Highest total coliform counts in surface water was 940×103 CFU/100 ml at the Alibeykoy Creek in November and highest fecal coliform was 178×103 CFU/100 ml at the same area in October. The lowest coliform counts were observed during summer, while the highest counts were in autumn. During rainy days, some domestic wastewater overflowing from sewerages are discharged to the estuary, which those water adversely affect water quality. The total and fecal coliform counts in surface water increased gradually from the lower to upper section of the estuary. Although the Black Sea water pumping from the Strait of Istanbul to the Golden Horn by Kagithane Creek is an important factor in the decrease of pollution and better water quality, there are still some runoff materials including uncontrolled discharges particularly in the Alibeykoy Creek. The results of this study showed that that the bacteriological pollution increased due to municipal wastewater resulting from overflow after the precipitation and the surrounding waters of the Golden Horn basin mix with surface waters. Thus, the most important factor in order to decrease the bacteriological pollution is to provide a full control of the surface discharges.
AtıfScopus10WoS10OpenAlex13İncele - MakaleYalnız künye2018Scopus SJRQ2Trace Metal Levels in Rainbow Trout (Oncorhynchus mykiss) Cultured in Net Cages in a Reservoir and Evaluation of Human Health Risks from Consumption
Varol, Memet; Kaya, Gülderen Kurt; Alp, Sumru Anık; Sünbül, Muhammet Raşit
Although fish consumption has positive health effects, metals accumulated in fish can cause human health risks. In this study, the levels of ten metals in rainbow trout (Oncorhynchus mykiss) farmed in the Keban Dam Reservoir, which has the biggest rainbow trout production capacity in Turkey, were determined and compared with the maximum permissible levels (MPLs). Also, human health risks associated with rainbow trout consumption were assessed. The metal concentrations in rainbow trout were found below the MPLs. The estimated daily intake of each metal was much lower than the respective tolerable daily intake. The target hazard quotient (THQ) for individual metal and total THQ for combined metals did not exceed 1, indicating no health risk for consumers. The cancer risk (CR) value for inorganic arsenic was within the acceptable lifetime risk range of 10−6 and 10−4. For carcinogenic and non-carcinogenic effects, the maximum allowable fish consumption rates were high enough to ensure the human health. According to these results, the consumption of rainbow trout farmed in the Keban Dam Reservoir does not pose a risk on human health.
AtıfScopus33WoS32OpenAlex33İncele
