Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2024/r/munzur/6304
  Effect of Synthetic Wastewater on Antioxidant Defence System in Dreissena polymorpha

  Serdar, Osman; Erguven, Gokhan Onder; Yildirim, Nuran Cikcikoglu; Korkmaz, Volkan; Erguven, Gozde

  The effects of the synthetic wastewater on antioxidant defence system in Dreissena polymorpha was evaluated. For this purpose, SOD, CAT, GPX activities and TBARS and GSH levels in tissues were determined by using commercial kits. The activities of SOD and CAT were in sythtetic group were determined lower than the control group in D. polymorpha during 24 and 96 h (p<0.05). After exposure of the cells of D. polymorpha samples to synthetic wastewater, depletion in GSH levels and subsequent increase in TBARS levels were observed, reflecting their unstable state. According to the data obtained from the study, It can be inferred that the biomarkers being domestic monitored are beneficial and effective in evaluating the biochemical mechanisms of wastewater as early warning indicators.

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• MakaleYalnız künye2024Scopus SJRQ3/r/munzur/1727
  The RSM-CCD Optimization of Fenton Process for Industrial Wastewater Treatment and Determination of Treatment Efficiency Using Some Biochemical Responses in Dreissena polymorpha

  Tanyol, Mehtap; Serdar, Osman; Ketenalp, Zozan; Yildirim, Nuran Cikcikoglu; Erguven, Gokhan Onder; Yildirim, Numan

  The study investigated antioxidant biomarkers in Dreissena polymorpha to evaluate the efficiency of Fenton process (FP) in Organized Industrial Zone Wastewater (OIZW) treatment. Antioxidant enzymatic activities, including superoxide dismutase (SOD) and catalase (CAT), glutathione peroxidase (GPX), non-enzymatic antioxidants (GSH) and the indicator of lipid peroxidation (TBARS) were measured in D. polymorpha in response to treated OIZW by FP. The performance of the FP has been optimized with response surface methodology (RSM). The optimum conditions (reaction time, and H2O2 and Fe2+ concentration) for OIZW by the FP process were determined. The results showed that the highest COD removal efficiency (83.94 %) was obtained when as Fe2+ concentration=402.35 mg/L, H2O2 concentration=4100.30 mg/L, and reaction time=10.10 min (desirability=1.000). SOD and CAT enzyme was decreased in the 1/25 diluted OIZW group compared to control group. CAT and SOD enzyme activities were increased after treatment compared to control groups. No statistically significant changes were observed in GSH levels and GPx activities. TBARS levels were increased 1/25 diluted OIZW exposure groups compared to the control group. TBARS levels were decreased after treatment. The results revealed that antioxidant parameters are useful biomarkers for determining the treatment efficiency of the FP.

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  AtıfScopus2·WoS1·OpenAlex2

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• MakaleAçık Erişim2024Scopus SJRQ3/r/munzur/1576
  sThe Bioremediation of Industrial Effluents by Phanerochaete Chrysosporium: The COD, TOC Removal Efficiency and Biochemical Assessment for Dreissena Polymorpha

  Serdar, Osman; Yıldırım, Numan; Onder Erguven, Gokhan; Ketenalp, Zozan; Cikcikoglu Yildirim, Nuran; Durmus, Barbaros

  Bioremediation is one of the cheapest and easy method for biological treatment for most kind of industial wastewater. Bioremediation potential of the Phanerochaete chrysosporium for industrial wastewater from Industrial Zone Wastewater plant in Mardin, Turkey, was evaluated. The chemical oxygen demand (COD) and total organic carbon (TOC) reduction efficiencies of P. chrysoporium of on wastewater studied using biomarkers such as catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), Thiobarbituric Acid (TBARS) and reduced glutathione (GSH) levels in Dreissena polymorpha. The level of TBARS, a marker of lipid peroxidation was found to be high because of wastewater exposure after treatment. TBARS levels decreased (from 20.2 to 31.6 and from 20.8 to 37.5). GSH levels (from 52.3 to 15.9), CAT levels (from, 119.7 to 15.3 and from 91.1 to 13.4) SOD levels (from 3.8 to 0.9 and from 3.4 to 1.2) and GPX activity (from 177.2 to 104.4 and 174.2 to 100.5) decreased in the wastewater exposure groups during 24 and 96th hour compared to the control groups. GSH levels, CAT, SOD and GPX activity increased after treatment by P. chrysosporium. Results indicate that industrial wastewater caused oxidative stress in Dreissena polymorpha. The findings revealed that the highest removal efficiency for COD and TOC, at 86.3 % and 80.3 % respectively, occurred in the 1/20 diluted medium. P. chrysosporium has proven to be effective in the bioremediation of wastewater from the Industrial Zone Changes in biochemical parameters before and after bioremediation showed that antioxidant parameters such as CAT, SOD, GPx activities and GSH and TBARS levels can be used as biomarker to evaluate bioremediation efficiency.

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  AtıfScopus4·WoS2·OpenAlex4

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• MakaleAçık Erişim2023/r/munzur/6378
  Bioremediation of Synthetic Prepared Domestic Wastewater with P. chrysosporium

  Erguven, Gokhan Onder; Yildirim, Nuran Cikcikoglu; Aydin, Ekrem; Ergül, Gözde

  In this study, the removal efficiencies were evaluated based on key environmental parameters such as chemical oxygen demand (COD), Total Organic Carbon (TOC), Total Nitrogen (TN), and Total Phosphorus (TP), using P. chrysosporium white rot fungus to treat synthetically prepared domestic wastewater. The research aimed to assess the suitability of bioremediation results with respect to the Urban Wastewater Treatment Regulation. The experiment was carried out over a span of 11th days, employing static 1/1 and 1/5, as well as dynamic 1/1 and 1/5 dilution ratios. The outcomes revealed varying removal efficiencies, with the highest rates observed at dynamic conditions and a 1/5 dilution ratio: 84% for COD, 81% for TOC, 73% for TN, and 56% for TP. Conversely, the lowest removal efficiencies were determined under static 1/1 conditions, reaching 48% for COD, 33% for TOC, 31% for TN, and 45% for TP. Based on the results, it is evident that P. chrysosporium exhibited effective bioremediation capabilities on synthetic domestic wastewater within a reasonable 11th day period. Furthermore, the results aligned with the specified limit values outlined in the Urban Wastewater Treatment Regulation. Consequently, the study highlights the efficacy of P. chrysosporium as a valuable species for biological treatment stages in urban wastewater management

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• MakaleAçık Erişim2023Scopus SJRQ3/r/munzur/2556
  Bioremediation of herbicide diquat dibromide from aqueous solution with white rot fungus Phanerochaete chrysosporium

  Yildirim, Numan; Ciftci, Emine; Erguven, Gokhan Onder; Durmus, Barbaros

  In this study, the fungal bioremediation of herbicide diquat dibromide (DD) by white rot fungus Phanerochaete chrysosporium was studied. After bioremediation, the reduction in toxicity of the remediated media was evaluated by Daphnia magna as a model organism. For bioremediation studies, flask-level batch experiments were performed at different DD concentrations (10, 20 and 50 ppm) under static and agitated conditions. The highest reduction rates of chemical oxygen demand and total organic carbon were determined as 85.92 (for 20 ppm DD) and 87.46% (for 10 ppm DD), respectively under agitated conditions. After bioremediation, D. magna bioassay was used for toxicity assessment during 24, 48 and 72-h periods. In current study, it was observed that P. chrysosporium has very effective bioremediation capacity for diquat dibromide. The D. magna bioassay revealed that P. chrysosporium provides effective reduction in toxicity of diquat dibromide.

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• MakaleAçık Erişim2023Scopus SJRQ3/r/munzur/1622
  The biosorption of Co(II) by Homalothecium sericeum from aqueous solutions under batch conditions: response surface methodology optimization and Daphnia magna bioassay

  Tanyol, Mehtap; Korkmaz, Volkan; Yildirim, Numan; Erguven, Gokhan Onder; Ayhan, Nagihan Karaaslan; Alatas, Mevlut

  In the present work, Homalothecium sericeum biomass was used for removal of Co(II) from aqueous solution. The effects of process parameters (contact time, biosorbent amount, and initial Co(II) con-centration) on the response (Co(II) % removal) were investigated using a batch adsorption system optimized with response surface methodology/central composite design method. Under optimized conditions the maximum Co(II) removal efficiency achieved is 94.07% at an initial Co(II) concentration of 2.05 mg/L, a H. sericeum amount of 0.34 g/50 mL, and a process time of 36.09 min. In this study, the toxicity of the medium after biosorption carried out under optimized conditions was also tested with Daphnia magna bioassay. When mortality results with D. magna were evaluated, although a removal efficiency of 94.07% was obtained after biosorption, this was not sufficient to reduce mortality of D. magna.

  AtıfScopus1·WoS2

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• MakaleAçık Erişim2022/r/munzur/5863
  Consumers’ Preferences for Drinking Water in Istanbul City

  Erguven, Gokhan Onder; Kanat, Gurdal; Erguven, Gozde

  Water is an indispensable resource for living things to survive. In addition to its direct consumption, water is also used in the preparation of foods necessary for eating and drinking. Therefore, it is extremely important that the water used is drinkable, healthy and safe. The aim of this study is to determine the place of network water as drinking water in consumer preferences. In accordance this purpose, an online questionnaire was prepared with 274 participants from different age groups, including students from Yıldız Technical University (YTU) Department of Environmental Engineering and their relatives and neighbours, including different ages and occupational groups. With this questionnaire, the factors affecting their water preferences and water usage profiles were determined. As a result of the survey, 54.1% of the participants use carboy water, 33.8% use pet bottle water, 12.1% use network water. The criteria that consumers pay attention to in their water preferences are taste, smell, color, cleanliness and the amount of mineral substances in the water, respectively. The reasons for preferring the carboy water, which is preferred by the majority, are that they find the carboy water cleaner and safer and that it tastes better. On the other hand, participants who preferred tap water stated that 33.3% of them preferred this water because its clean and reliable properties, 33.3% of it was affordable and 22.2% of it was easily accessible. When the degree of trust in the network water was questioned, 12.2% of the participants said that they found the network water safe, 40.5% did not find it safe and 47.3% said they were not sure. In addition, when the participants ranked carboy water, pet bottle water and network water according to the degree of reliability, the network water was found to be reliable with a large rate of 89.2%. 35.1% of the respondents stated that they would prefer to drink tap water if the Water Administration periodically discloses their water quality reports and indicates that the network water is clean enough.

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  AtıfOpenAlex1

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• MakaleYalnız künye2022/r/munzur/5805
  Bioremediation Performance of Sphingomonas melonis and Bacillus\rmuralis on Herbicide Diquot Dipremide-(ethylene-d4)

  Erguven, Gokhan Onder; Yildirim, Numan; Koçak, Emel; Durmus, Mehmet Harun Bogacbarbaros; Aydin, Ekrem

  Bioremediation is a process that utilizes the degradation potential of microorganism to provide a cost-effective and reliable\rapproach for pesticide biodegradation. For this purpose, chosen bacteria Sphingomonas melonis and Bacillus muralis were isolated\rfrom an agricultural soil sample. The biodegradation performance of these isolated bacteria at different Diquot Dipremide-\r(ethylene-d4) (DDE4) herbicide concentrations (250, 500 and 1000 ppm) was investigated under submerged culture conditions.\rBiodegradation performance of isolated bacteria was monitored with COD, TOC and, BOD5 reduction rates in culture medium at\rdifferent incubation periods. According to the results; S. melonis has the highest bioremediation capacity for COD removal (91%\rat 250 ppm). For TOC, B. muralis has the highest removal rate as 82% at 250 ppm. On the other hand, For BOD5 at 250 ppm 85%\rS. melonis showed the best removal performance. Most effective removal rate at 250 ppm concentrations was obtained as 91%\rand 88 by S. melonis and B. muralis respectively at the end of the 216th hour for COD. Additionally, the increase in turbidity\rrelated with population dynamics at the end of the 216 th hour positively effected the bioremediation parameters included COD,\rTOC and BOD5 reductions. These results showed that it can be used for effective COD, TOC and BOD5 removal in S. melonis and\rB. muralis on DDE4 remediation

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• MakaleAçık Erişim2022Scopus SJRQ3/r/munzur/3048
  Decolorization of Remazol Brilliant Violet 5R and Brilliant Green dyes by Hypnum cupressiforme using response surface methodology-central composite design methodology: toxicity assessment studies by Daphnia magna

  Korkmaz, Volkan; Erguven, Gokhan Onder; Tanyol, Mehtap; Alatas, Mevlut; Yildirim, Numan

  This study is the first report that aims to optimize the removal of Remazol Brilliant Violet 5R (RBV 5R) and Brilliant Green (BG) from synthetic solutions using Hypnum cupressiforme samples from Abant Mountains of Bolu (Turkey) as biosorbent and to conduct toxicity evaluation studies of treated wastewater using Daphnia magna. Optimization was performed using central composite design under response surface methodology with the operational factors of dye concentration, H. cupressiforme dose, and process time. The optimal conditions for dye concentration, H. cupres-siforme dose, and process time obtained by the numerical analysis were 19.02 mg/L, 0.18 g/50 mL and 110.59 min for RBV 5R, while these values were 18.57 mg/L, 0.18 g/50 mL and 99.45 min for BG, respectively. At the optimum values, maximum RBV 5R and BG removal were achieved as 99.39% and 99.22%, respectively. The D. magna mortality rates showed that treatment with adsorption were sufficient to remove the complete toxicity of dyes especially for RBV 5R.

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  AtıfScopus2·WoS2·OpenAlex2

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• MakaleAçık Erişim2022Scopus SJRQ2/r/munzur/2956
  The Bioremediation Capacity of Sphingomonas melonis for Methomyl-Contaminated Soil Media: RSM Optimization and Biochemical Assessment by Dreissena polymorpha

  Önder Erguven, Gokhan; Serdar, Osman; Tanyol, Mehtap; Cikcikoglu Yildirim, Nuran; Yildirim, Numan; Durmus, Barbaros

  The bioremediation capacity of S. melonis for methomyl investigated with RSM. Oxidative stress and neurotoxic response determined in D. polymorpha. COD and TOC levels were measured. GSH, MDA levels and CAT, SOD, AChE activities in D. polymorpha exposed to before (group A) and after (group B) bioremediated media during 24 and 96 h were tested by using ELISA kit. AchE activity was decreased 24th h but increased during 96th h in group B compared with group A (p<0.05). MDA levels and CAT activities were decreased during 24 h and 96 h in group B compared with group A (p<0.05). GSH levels were increased during 24 h and 96 h in group B compared with group A (p<0.05). SOD activity did not show a significant change in group B (p<0.05). Methomyl could be effectively remediated by S. melonis and CAT, AChE activities and GSH, TBARS levels of D. polymorpha are useful biomarkers for evaluating the bioremediation capacity.

  AtıfScopus5·WoS6·OpenAlex6

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