Browsing by Author "Disli, Erkan"

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Adsorption of Crystal Violet From Aqueous Solution on Activated Carbon Derived From Golbasi Lignite
(oficyna Wydawnicza Politechniki Wroclawskiej, 2012) Depci, Tolga; Kul, Ali Riza; Onal, Yunus; Disli, Erkan; Alkan, Salih; Turkmenoglu, Z. Funda
Activated carbon (AC) was obtained from lignite of the local resource, Golbasi - Adiyaman (Turkey) by chemical activation. The Golbasi lignite was chosen as the precursor for its availability and low cost. The BET surface area of the activated carbon was found 921 m2/g. The AC was used as an adsorbent for Crystal Violet (CV) in aqueous solution. The adsorption properties of CV onto the activated carbon are discussed in terms of the adsorption isotherms (Langmuir and Freundlich) and the kinetic models (pseudo-first-order, pseudo-second-order and intraparticle diffusion model). It was shown that the experimental results best fitted by the Langmuir model, and the second-order kinetic equation. The thermodynamic parameters show that the adsorption process is endothermic. The experimental results point out that the obtained activated carbon is a viable candidate for sorbent removing CV from aqueous solutions.
Assessment and Validation of Groundwater Vulnerability To Nitrate and Tds Using Based on a Modified Drastic Model: a Case Study in the Erbil Central Sub-Basin, Iraq
(Springer, 2023) Smail, Razhan Qadir Smail; Disli, Erkan
In recent years, groundwater vulnerability assessment has become a crucial step in effectively protecting groundwater resources against increasing groundwater pollution in recent years. Sustainable effectual management of groundwater sources in terms of quality has become a critical factor in the development of unplanned urbanization areas, especially in regions with intensive agricultural and industrial activities in the land use/land cover (LULC) models. In this study, the GIS-based DRASTIC model was used by modified to estimate the groundwater vulnerability of porous aquifers to nitrate and total dissolved solids (TDS). The DRASTIC and the modified DRASTIC models generate four different groundwater vulnerability zones: high (33.6, 37.8%), moderate (45.9, 42.3%), low (18.7, 18.3%), and very low (1.8,1.6%). DRASTIC_LULC index map provides four different vulnerability zones: low, moderate, high, and very high, covering 0.1%, 7.6%, 83.6%, and 8.7% of the Erbil Central Sub-Basin, respectively. The most important hydrogeological factors determining the DRASTIC vulnerability obtained from sensitivity analyses are depth to the water table and impact of vadose zone parameters with average effective weight values of 23.7% and 22.6%. For validating the DRASTIC_LULC model, the water quality parameters, nitrate and TDS, have been used with an accuracy of 68% and 79%, which indicates that the validation accuracy for this model is quite high. Maps obtained as a result of this study can be used to create a baseline map for the sustainable management of groundwater quality in vulnerable areas of the Erbil Central Sub-Basin and its planning.
Characteristic Properties of Adsorbed Catalase Onto Activated Carbon Based Adiyaman Lignite
(Parlar Scientific Publications (p S P), 2011) Depci, Tolga; Alkan, Salih; Kul, Ali Riza; Onal, Yunus; Alacabey, Ihsan; Disli, Erkan
Catalase is one of the most common and important enzymes in biological systems. However, its purification process has some difficulties and it can be easily decomposed in aqueous or nonaqueous solutions. Therefore, a catalase should be adsorbed on solid materials to reduce its inactivation and to increase its economic value. Activated carbon which was obtained from Turkish low-rank coal (Golbasi-Adiyaman) by chemical activation was used as a solid carrier to adsorb catalase for the first time in this research. The pore structure of the activated carbon was determined by A Tri Star 3000 (Micromeritics, USA) surface analyzer and scanning electron microscope. In order to determine adsorption properties of catalase, ionic strength effect, temperature-activity, pH-activity, storage stability and operational stability of the activated carbon were investigated. The kinetic and thermodynamic mechanisms of adsorbed enzyme were also studied. The experimental results pointed out that the obtained activated carbon is a viable candidate for an alternative solid carrier for catalase and it may be a promising material for various biotechnological applications.
Hydrochemical and Environmental Isotopes Characteristic of Groundwater and Controlling Factors for Waters' Chemical Composition in the Iron-Copper Mine Area of Elazig, Se Turkey
(Csiro Publishing, 2022) Ozturk, Metin; Disli, Erkan
Rationale and hypothesis. Groundwater is generally the most important water resource in mine areas, and its circulation processes need to be studied in detail for rational resource exploitation. This work tested the hypothesis that the evolution of groundwater chemistry and recharge by using hydrogeochemical indicators and isotope tracers together are affected by the hydrogeochemical processes that may have taken place during the water-rock interactions in the Zeryan Stream Sub-basin, where the Iron-Copper mine is located. Methodology. It used approaches such as hydrochemistry, Piper diagrams, saturation index, ionic ratios, and environmental isotopes to analyze groundwater origin and hydrochemical processes affecting water chemistry. Fifty-seven water samples were collected from 19 points during wet and dry periods. Results. Results indicated that the dominance of cations and anions in the mine water follows the trend Mg2+ > Ca2+ > Na+ > K+ and SO42- > HCO3- > Cl-, and most of the water samples are Mg-Ca-HCO3-SO4, Mg-Ca-SO4-HCO3, and Ca-HCO3. Discussion. Evaluation of analyzed groundwater chemical data showed that dissolution or precipitation of silicate minerals dominated in the hydrochemical evolution of groundwater, dissolution of carbonate minerals was a secondary process and to a lesser extent, ion exchange processes played a role. The delta D and delta O-18 isotopic contents indicated that the water samples were controlled by local atmospheric precipitation, and affected by secondary evaporation during the recharge process. Tritium levels indicated some well waters are recharged from older groundwater resources from water-rock interaction and residence time. Findings. The findings of this study were provided to decision-makers in order to design sustainable implications for groundwater utilization based on the sub-basin.
Hydrogeochemical Investigation of an Epithermal Mineralization Bearing Basin Using Multivariate Statistical Techniques and Isotopic Evidence of Groundwater: Kestanelik Sub-Basin, Lapseki, Turkey
(Elsevier Gmbh, 2020) Disli, Erkan; Gulyuz, Nilay
This study investigates hydrogeochemical processes controlling the groundwater quality using 64 groundwater samples in the epithermal mineralization bearing Kestanelik Sub Basin, NW Turkey. The groundwater dominantly exhibits a mixed-ion hydrochemical facies characterized by Ca-Mg-HCO3, Mg-Ca-HCO3, Ca-Mg-HCO3-SO4 and Ca-Mg-Na-HCO3 reflecting weakly mineralized waters circulating within calcareous sandstone and colluvium. The molar ratios of (Ca2++Mg2+)/(SO42-+HCO3-) and Na+/Cl(-)ratios and the linear plot between (Na++K+)-Cl- and (Ca2++Mg2+)-(HCO3-+SO42-) indicate that of dissolution of carbonates and silicate weathering, ion and reverse ion exchange processes influence the hydrogeochemistry of groundwater sources. Three and four factors account with 84.48 and 75.27 % of the total variance for spring and well waters, respectively. FC1 in the groundwater samples is described by strong loadings of TH, Ca2+, Mg2+, HCO3-, Ba, TDS, Cl-, EC and SO42-, and moderate loading of Na+, Mn, K+, TDS, pH. FC2 in the samples has strong positive loadings on Al, Fe, Zn, Na+, SO42-, Cl- and moderate positive loadings on B, TDS and K+. FC3 shows strong positive loading on Cu, Al, DO and moderate factor loadings for Fe in the well water samples. FC4 exhibits high positive loadings for As, Zn, and moderate positive loading for EC. Geochemical variables of FC 1, 2, 3 and 4 for the groundwater indicates mixed geogenic source of groundwater contamination through water-rock interaction processes dominantly from (i) the calcareous sandstone, serpentinite and colluvium lithologies and (ii) quartz, illite, pyrite and iron oxide minerals sourced from epithermal mineralization in the area. pH and As values exceed the desirable limits of WHO and TSE 266 guidelines for drinking purpose. The tritium levels show that some well waters have experienced longer water-rock interaction and residence time and are thus recharged from older groundwater sources compared to other well and spring waters.
Hydrology and Water Chemistry of Lake Burdur, South-West Anatolia, Turkey
(Health & Environment Assoc, 2015) Disli, Erkan
Lake Burdur is a closed-basin, alkaline, saline lake, at 847 m above sea level in south-west Anatolia, Turkey, divided between the provinces of Burdur to the south and Isparta to the north. Lake Burdur lies in an isolated closed basin entirely surrounded by the Burdur Lake basin, which exerts a very strong influence on the hydrology and sedimentology of the lake. The 1671.025 km(2) surface-water drainage basin containing Lake Burdur, as defined by topographic maps, is long and narrow. The lake is situated along the west-central boundary of the basin, and is about 30 km long by 7 km wide. When the lake surface is at an elevation of 843.40 m above sea level, it covers an area of nearly 155.666 km(2), with an average depth of 53.83 m and a maximum depth of 60.92 m. The main resources that feed the lake are rainfalls, rivers and underground water resources. Among the important water resources that feed the lake are Bozcay, Suludere, Keciborlu River and Asar River. The main reason for the decrease in the water level of Burdur Lake is the dams and ponds constructed on the rivers that feed the lake since 1970. The pH values for Lake Burdur ranged from a minimum of 9.1 to a maximum of 9.13 with the mean of 9.116 respectively. The electrical conductivity (EC) values in Lake Burdur ranged from 32160 to 33770 mu S/cm, with an average 32863.3 mu S/cm, in the groundwater ranged from 607 to 6200 mu S/cm, with an average of 2786.3 mu S/cm. The values of Ca2+ and Mg2+ varied from 10.7 to 62 mg/l and 646 to 5880 mg/l with an average value of 32.53 and 2737.67 mg/l in lake water samples collected from various sites. The values of Na+ and K+ varied from 3630 to 7530 mg/l and 95.3 to 636 mg/l with an average value of 6301.7 and 285.1 mg/l in lake water samples. The values of HCO3- and Cl-and ranged from 952 to 1330 mg/l and 904 to 6960 mg/l with an average value of 1177.5 and 5647.3 mg/l. The values of SO42- reported for lake water samples varied between 1800-14300 mg/l with an average value of 11450 mg/l. Similarly, the value of CO3- varied from 390 to 636 mg/l with an average value of 561 mg/l.
Utilizing Mining Dam Bottom Sludge as a Novel Adsorbent for Auo Removal From Wastewaters: Batch and Column Studies
(Elsevier, 2021) Disli, Erkan; Ozturk, Dilara; Aladag, Erdinc
In this study, the adsorption of Auramine O (AuO) dye using bottom sludge (BS) was investigated in batch and continuous systems. The BS was characterized by EDX, BET, XRD, DLS, sigma-potential, SEM, FTIR, helium pycnometer, and mercury porosimetry. The kinetic and isotherm data were fitted to pseudo-second-order and Langmuir models. The maximum amount of adsorption calculated from the Langmuir isotherm model was 5.09 mg/g. Thermodynamic studies showed that adsorption was endothermic and occurred spontaneously. Thomas, Clark, and Yoon-Nelson models were suitable (R-2 > 0.95 for all these models) to explain the dynamic behavior of AuO-BS in the column system. Increased bed depth increased breakthrough time, while the breakthrough time declined with increased initial AuO concentration and flow rate. Optimum conditions were determined for the batch system as 4 g of BS dose, 100 rpm agitation speed, and 90 min reaction time; optimum conditions for the column system were 3 cm bed depth, 0.14 mL/min flow rate, reaction time of 181 h; and optimum conditions for both systems were 100 mg/L AuO concentration, 20 degrees C reaction temperature and pH 6.18 (natural). Under these conditions, the amounts of AuO adsorbed in batch and column systems were calculated as 2.06 mg/g (89.75%) and 2.63 mg/g (47.13%), respectively. The studies showed that efficient remediation of AuO from aquatic environments is possible with BS. (C) 2021 Elsevier B.V. All rights reserved.