Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2024Effect 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.
- MakaleYalnız künye2024Scopus SJRQ3The 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.
AtıfScopus2WoS1OpenAlex2
İncele - MakaleAçık Erişim2023Bioremediation 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
- MakaleAçık Erişim2023Scopus SJRQ3Bioremediation 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.
- MakaleAçık Erişim2023Scopus SJRQ3The 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.
AtıfScopus1WoS2İncele - MakaleAçık Erişim2022Consumers’ 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.
AtıfOpenAlex1
İncele - MakaleYalnız künye2022Bioremediation 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
- MakaleAçık Erişim2022Scopus SJRQ3Decolorization 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.
AtıfScopus2WoS2OpenAlex2İncele - MakaleAçık Erişim2021Removal of Chemical Oxygen Demand, Total Organic Carbon and Color from Textile Industry Wastewater by Using Phanerochaete chrysosporium (ME446)
Erguven, Gokhan Onder; Yildirim, Numan; Çelik, Aytekin
Wastewater discharge from textile industries concern environmental risks. Superiority of microbial methods over other high cost combined methods includes conversion of persistent organic materials to non-toxic last materials, sustainability, low cost, and comfortable. Textile wastewaters can have opposite effects on the quality of water in total organic carbon (TOC) and Chemical oxygen demand (COD). Agitation cultures can reach the surface area of the dyes, whereas a static cannot do. Biotreatment of textile wastewater from the dyeing process using white-rot fungus Phanerochaete chrysosporium (P.C) was investigated in agitated and static culture conditions. Dye is the major pollutant component in this wastewater includes some different organic pollutants. The treatment mediums containing distilled water in 1:10 ratio of wastewater were compared for treatment efficiency of P.C. Especially in agitated conditions at 27 oC and 150 rpm, it was achieved a successful treatment results. Under these conditions, a 48h long treatment reduced by 91,46 % of the original COD (from 1484 mg l-1) and by 94,92% the TOC (initial was 723.66 mg l-1). Moreover, treatment reduced color by 86,28 % from 3.550 A540 to 0.487 A540 at the end of the study. The decolorization properties of P.C obtained high performance and we determined P.C showed up to effective removal rate for COD and TOC within 48 hours. We suggest that these fungus pellets of P.C can reach the decolorization and can be a useful tool for bioremediation of textile dye wastewater within a short time period.
AtıfOpenAlex3İncele - MakaleYalnız künye2021Scopus SJRQ1Using Ochrobactrum thiophenivorans and Sphingomonas melonis for bioremediation of Imidacloprid
Erguven, Gokhan Onder; Demirci, Ulas
To solve the environmental problems of the pesticides, bioremediation methods are commonly useful for their environment friendly properties. These methods are more cheap, useful and have more advantages for remediate receiving environments In this study, imidacloprid which is one of the selective insecticide in all over the world is chosenfor bioremediation studies with two soil bacteria. The imidacloprid used in the Mediterranean climate for cotton, pistachios, tomatoes, peppers and eggplant cultivation. The bioremediation of this insecticide was investigated via the performance of O.thiophenivorans and S. melonis in agitated culture media. The agricultural soil used for the isolation of these two bacteria was taken from the cotton cultivated agricultural area in Adana province in Turkey. For this purpose, the isolated and enriched bacteria were added to the recommended insecticide concentrations, and the Imidacloprid active material, Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD5), Total Organic Carbon (TOC), pH and dissolved oxygen (DO) parameters were determined for two weeks on each day of the study. O. thiophenivorens and S. melonis bioremediate the Imidacloprid insecticide with high efficiency (over 90%). According to these results, it is understood that these bacteria can be preferred in the bioremediation of receiving environments that are contaminated with such pesticides and can be useful for scientists to handle the opposite effects of such persistent organic pollutants and COD, BOD5 and TOC parameters can easily give opinions about decreasing of pesticides like the active materials
AtıfScopus28WoS27OpenAlex30İncele - MakaleAçık Erişim2021Scopus SJRQ1The bioremediation of glyphosate in soil media by some newly isolated bacteria: The COD, TOC removal efficiency and mortality assessment for Daphnia magna
Korkmaz, Volkan; Yildirim, Numan; Erguven, Gokhan Onder; Durmus, Barbaros; Nuhoglu, Yasar
In this study, the bioremediation capacity of three isolates of Bacillus aryabhattai, Pseudomonas azotoformans and Sphingomonas pseudosanguinis and their consortia at glyphosate added soil medium investigated via the reduction of chemical oxygen demand (COD) and total organic carbon (TOC) parameters in filtrate waters obtained from a designed bioremediation setup. Additionally, mortality assays were performed on the filtrate waters with model organism Daphnia magna. According to the results of the experiments, at the end of the 11 days, the highest COD reduction rate seen in media with S. pseudosanguinis as 92.1% while TOC rate was 69.13% in consortia media. While the mortality rate was 10, 10 and 5% on B, P and S application groups at the end of the 72th respectively, these rates were 100% in control group at the end of the 48th. According to the results obtained from bioremediation and mortality assessment, these bacteria can reach the high bioremediation rate one by one and in consortia media.
AtıfScopus14OpenAlex16İncele - MakaleAçık Erişim2020Katı Atık Yönetiminde Kompostlaştırmanın Önemi, Problemler ve Çözüm Önerileri: Türkiye Örneği
Erguven, Gokhan Onder; Kanat, Gurdal
Organik atıkların yüksek üretim oranları ve bu atıkların açık çöp sahalarına veya sıhhi olmayan depolama alanlarına atılması olumsuz birtakım çevresel, ekonomik ve sosyal sorunlara neden olmaktadır. Kompostlama, organik atıkların yönlendirilmesinde daha temiz teknolojilerden birini temsil eder. Elde edinilen son raporlara göre, Türkiye'de 2018 yılında üretilen belediye atık miktarı 32,2 milyon ton olarak gerçekleşti. Diğer ülkelere benzer şekilde, Türkiye'de belediye atıklarının en uygun ve ekonomik yöntemlerle bertaraf edilmesi planlanmaktadır. Belediye atık yönetimi planlaması yönetmeliklerin amaçlarına dayanmaktadır. Mevcut durumda, Çevre Bakanlığı verilerine göre Türkiye'de 8 adet biyolojik atık işleme tesisi bulunmaktadır. Ayrıca, karışık belediye atıklarının işlendiği 6 mekanik-biyolojik ön arıtma ve geri dönüşüm tesisi bulunmaktadır. Atık yönetim planlarında, 2023 yılında oluşan atıkların %65'i düzenli depolama ve %35'i geri kazanımı hedeflenmiştir. Bu çalışmada, Türkiye ve diğer benzer ülkelerdeki belediye atık yönetimi sorunlarının detayları ve başarı öyküleri incelenmiş ve bunlara ilave olarak sonuçlar tartışılmıştır. Kompostlamanın birçok ülke ve Türkiye'de, bazı sorunlarından dolayı hala yaygın bir yöntem olmadığı görülmektedir. İdari ve teknik faktörler değerlendirildiğinde, atık transferi ile düzenli depolama ve biyogaz geri kazanımı ülkedeki en iyi, en kolay ve ekonomik yöntemdir. Biyolojik ve katı atık yönetimi oldukça önemli bir iştir. Bu proses yönetim sistemi için önemli bir rol oynar. Buna ilave olarak Türkiye’deki ve özellikle İstanbul ilindeki ulusal sıfır atık faaliyetleri ile ilgili yönetim ilk aşamadadır ve bu işlemlerin daha iyi sonuç almaları için uzun bir zaman periyoduna ihtiyacı olduğu aşıkardır.
AtıfOpenAlex6TR Dizin4İncele - MakaleAçık Erişim2020Investigation of Air Quality in Terms of Microbiological Density in Some Regions of the European Side of Istanbul Province
Erguven, Gokhan Onder; Aydin, Sumeyye; Bayhan, Hurrem; Ikizoglu, Bahar
Microbial fauna of the outdoor ambient air of Istanbul has been determined in European side of Istanbul province at four differentdistricts (Bakirkoy, Fatih, Basaksehir and Esenler) by active and passive sedimentation sampling methods. In addition tometeorological factors, the effect of urbanization and traffic density for the air microbial load is also determined. Outdoor airsampling was performed between April 2014 and November 2015. The sedimentation method was done by standart plate count agar(PCA) opening the cover of the petri dishes containing a prepared medium. Standart plate count agar (PCA) medium was used for thedetermination of total bacteria while malt extract agar (MEA) was used for fungi. The colonies formed at the end of this period werecounted and total number of bacteria and fungi per unit volume and area were determined. Air temperature, relative humidity, windspeed and direction were also recorded. As a result of the active sampling method, the most counted units of bacteria was determinedat 35°C in Basaksehir station as 222 CFU(Colony forming unit)/m³, maximum fungal was determined as 286 CFU/m³at 20°Cincubation temperature. The maximum amount of bacteria in the passive sampling method results at 35°C was in Bakirkoy station as9250 CFU/m³.
- MakaleAçık Erişim2020Sphingomonas melonis ve Bacillus muralis’in İndaziflam Herbisiti Üzerinde Biyoparçalanma Performansının Değerlendirilmesi
Erguven, Gokhan Onder; Kanat, Gurdal
Bu çalışmada, toprak bakterileri olan Sphingomonas melonis) ve Bacillus muralis'in farklıindaziflam herbisiti konsantrasyonlarında (100, 150 ve 200 ppm) biyodegradasyon performansı250C'ta kültür koşullarında önemli çevresel parametreler ile birlikte incelenmiştir. S. melonisbakterisi Türkiye'nin Adana ilindeki pamuk tarımı yapılan tarımsal alandan izole edilirken, B.muralis Kırklareli bölgesinde ayçiçeği tarlasından izole edilmiştir. Çalışma sonucunda; S.melonis için en etkili biyoparçalanma oranı 6 günde BOİ5 ve KOİ için sırasıyla %83 ve 73 ikenTOK giderim oranları ise %70’tir. B. muralis için en etkili biyoparçalanma oranı KOİ ve BOİ5parametrelerinde 5 günde 100 ppm’de %91 ve 84 iken TOK giderim oranı aynı zaman zarfında%77’dir. S. melonis ve B. muralis’de 5. ve 6. günlerin sonunda popülasyon dinamiği sonuçlarınagöre bulanıklığın artması bu parametreler ile biyoremediasyon sonuçlarını doğrulamaktadır. Busonuçlar göstermiştir ki S. melonis ve B. muralis indaziflam remediasyonunda etkili KOİ, TOKve BOİ5 gideriminde kullanılabilir
AtıfOpenAlex1İncele - MakaleYalnız künye2020Scopus SJRQ2Investigation on Microbial Biodeterioration of the Stone Monuments in Yildiz Technical University—Yildiz Campus—Istanbul—Turkey
Özdemir, Aysun; Erguven, Gokhan Onder; Adar, Elanur; Nuhoglu, Yasar
The stone samples of historical monuments around Yıldız Technical University Besiktas Campus were investigated using DNA extraction-PCR-DGGE methods, scanning electron microscopy (SEM), XRF, and other analytical methods to assess stone decay over the centuries. Microbial diversity was examined by classical cultivation and modern diagnostic methods besides modern analysis techniques. The number of the microorganisms in per gram of stone samples was calculated by microbial culture methods. SEM analysis showed that stone surfaces have too many pores, decaying pieces and microbial colony. It is put forth by XRF analysis that stone materials have some elements serving the growth of microorganisms. It was concluded that there is a close connection the stone structure and microbial growth, most likely mineralogical composition, hardness and porosity of stone. Cyanobacterial microorganisms lived on stone surfaces were also determined using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S rRNA gene fragments. It was revealed DNA-based molecular analysis of 16S rRNA that 23 bacterial/Cyanobacterial clones were inhabited to stone materials.
AtıfScopus10WoS10OpenAlex11
İncele - MakaleYalnız künye2020Scopus SJRQ2Can Toxicities Induced by Insecticide Methomyl be Remediated Via Soil Bacteria Ochrobactrum thiophenivorans and Sphingomonas melonis?
Tatar, Sule; Yildirim, Nuran Cikcikoglu; Serdar, Osman; Erguven, Gokhan Onder
The research study was about revealing the biochemical response of Gammarus pulex related to insecticide methomyl before and after bioremediation by two soil bacteria species, Ochrobactrum thiophenivorans and Sphingomonas melonis. Catalase (CAT), glutathione S-transferase.(GST), cytochrome. P4501A1 (CYP1A1) activities in G. Pulex related to methomyl solution were investigated in 24 h and 96 h. ELISA method was used for test studies. CAT enzyme was decreased in Gammarus pulex that was exposed to methomyl after all exposure period (P < 0.05). CAT activities were returned to control results after bioremediation assays. GST enzyme activity was decreased depending on methomyl exposure during 24 h but increased during 4 days (P < 0.05). After 8 days of bioremediation period, GST activity increased again during 24 h while decreased during 4 days (P < 0.05). CYP1A1 activity increased in Gammarus pulex that was exposed to methomyl after all exposure period (P > 0.05). After bioremediation, statistically significant changes were not revealed in CYP1A1 activities (P > 0.05). According to the results of our study, CYP1A1, CAT, and GST activities in G. pulex sanctioned the capability of Ochrobactrum thiophenivorans and Sphingomonas melonis in methomyl bioremediation. Isolated and enriched Ochrobactrum thiophenivorans and Sphingomonas melonis that were added to 2.5 ppb concentrations of methomyl for 8 days. Each day, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5), pH and dissolved oxygen parameters were monitored. At the final phase of the bioremediation step, it was determined that these bacteria have efficient methomyl bioremediation properties in a mixed corsortia at a rate of 86%. These results show that these bacteria can be used for bioremediate the receiving environments that are polluted by these kinds of insecticides.
AtıfScopus18WoS16OpenAlex19İncele - 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 - MakaleAçık Erişim2019Investigation of the Bioremediation of Herbicide Metribuzin with Bacillus subtilis Bacteria at Artifical Agricultural Field
Erguven, Gokhan Onder
The bioremoval of metribuzin (C8H14N4OS) which is one of the selective herbicide in tomato farming in Turkey was investigated with Bacillus subtilis bacteria under agitated culture conditions and artifical agricultural field. The bacterium was isolated in collected soil samples from one of the agricultural area in Elazig province of Turkey. The area is unexposed to metribuzin before. Five apparatuses were set up and 100 mL of metribuzin in 1750 ppm concentration (advised concentration of tomato farmers) was added to each Erlenmayer flasks. 5, 10, 20, 50 and 100 mL of enriched Bacillus subtilis solutions (in sabouraud dextrose broth) added to these flasks. Each mL of the enriched solutions contains ×107 Colony forming unit (CFU). These flasks were shaken at 160 rpm at 28 0C in sterile conditions for 17 days. In 24 hours intervals, each sample was collected to flasks and chemical oxygen demand (COD) was determined with DR/890 colorimeter by the line of closed reflux method while Biochemical oxygen demand (BOD5)experiments were performed via standard methods 5210D with oxitops. As a result of the study, best removal performance observed in 100 mL Bacillus subtilis as 98% at 17 days in COD. In a soil study, 100 mL mixture of Bacillus subtilis consortia used for bioremediation studies. According to the results of artifical agricultural field study, the bioremediation seen at COD and BOD5 parameters are 99.4% and 96% respectively at the end of 2. week. This experiments have focused that, Bacillus subtilis should be a selective type for bioremediation of metribuzin on receiving environments.
AtıfOpenAlex2TR Dizin2İncele - 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 - 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