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Öğe Anaerobic digestion of winery solid waste in a two-stage membrane process: Effect of loading rate on biomethane production(Elsevier, 2024) Muratcobanoglu, Hamdi; Yildiz, Yalcin SevkiThe wine industry causes a high amount of solid waste with high organic content at different parts of the production line. One of the best strategies to overcome organic solid waste management problem is anaerobic digestion, as It allows renewable energy production and waste reduction together. The OLR is considered one of the most important operating parameters in continuous or semi-continuous anaerobic operations, as it affects the overall performance of anaerobic digestion systems. Therefore, appropriate OLR determination plays a crucial role in anaerobic digestion. This study investigated the effect of OLR on the performance of a TAnMBR treating (winery solid waste) WSW in terms of biogas and biomethane production. To this end, the production of biogas and biomethane from WSW via a TAnMBR at four different OLRs (0.5 0.75 1.0 1.5 gVS/Lreac d) was investigated. Biogas production rates were 677, 850, 1265, and 566 ml/gVS and biomethane production rates were 352, 450, 679, and 251 ml/gVS respectively, during 0.5 0.75 1.0 1.5 gVS/Lreac d OLR operating conditions. Results revealed that proper biogas and biomethane production can continue until the OLR is 1.5. VFA accumulation can be considered as the main inhibition reason, at 1.5 OLR VFA/Alk ratio increased up to 1.6 with 1864 mgHAc/L VFA concentration. Additionally, phenol and sulfate concentrations were below 45 and 48 mg/L during operation, respectively, therefore it is considered that no inhibition occurred due to these parameters.Öğe ASSESSMENT OF ON-CAMPUS NOISE LEVELS AT CUMHURIYET UNIVERSITY(Parlar Scientific Publications (P S P), 2018) Ozyonar, Fuat; Gokkus, Omur; Muratcobanoglu, Hamdi; Gursoy, OnderNoise is one of the environmental parameters that affect people's life quality negatively. In recent years, noise pollution became an important environmental problem due to mechanization, expansion of motorways, increasing traffic loads and airline transport. When the noise is evaluated on a source basis, it can be said that it is mainly the result of the use of vehicles in traffic. In this study, a series of noise measurements were carried out in order to put forth the traffic-induced noise pollution in Cumhuriyet University campus and the results were assessed comparatively. Noise measurements were made at 9 different locations in the university campus for 5 days at three different time period of the day between May, 9-13 2016. It was observed that the 6th measurement point had higher noise levels than the other measurement points at the evening hours. It was concluded based on present findings that noise generation might differ based on weather conditions, measurement times and vehicle intensity.Öğe Biogas Upgrade Techologies And Biomethane Utulization Oportunities(Mehmet Sinan Bilgili, 2022) Muratcobanoglu, Hamdi; Mert, Ruhullah Ali; Muratcobanoglu, Fatma; Gokcek, Oznur Begum; Demirel, SevgiThe increase at the waste generation and energy demand still remain as a problem to be solved. Anaerobic digestion has a great importance in the term of waste reduction and renewable energy production as a green solution. Methane content of the biogas expresses the energy content and the potential. Removing impurities like CO2 H2S siloxane etc. and increasing the methane content of the biogas is allowing biomethane for further usage. Biomethane can be used as vehicle fuel (diesel replacement), gas grid injection (natural gas replacement), usage as a raw material for ethanol, dimethlyether etc. production other than electricity and heat generation. In this study, biogas upgrade technologies like pressure swing adsorption, membrane processes, scrubbing processes, cryogenic separation and biomethane utilization opportunities in the term of in-situ and ex-situ usage have been reviewed. In addition, the potential utilization areas of biomethane and specific requirements based on biogas quality are investigated comprehensively.Öğe Biomethane enhancement using reduced graphene oxide in anaerobic digestion of municipal solid waste(Elsevier Sci Ltd, 2022) Muratcobanoglu, Hamdi; Gokcek, Oznur Begum; Muratcobanoglu, Fatma; Mert, Ruhullah Ali; Demirel, SevgiThe present research investigated the impact of reduced graphene oxide (rGO) addition on the semi-continuous anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) in the range of 0.5-10 gVolatileSolid(VS)/L(reactor)day organic loading rates (OLR). Adding rGO enhanced the rate and yield of biomethane production, and the maximum biomethane increment rate was obtained as 110% at an OLR of 4.0 gVS/L(reactor)day. However, after increasing the OLR to 6 gVS/L(reactor)day, there was a dramatic decrease in biomethane production because of volatile fatty acid (VFA) accumulation. Methanotrix is the predominant archaeal genus at OLRs lower than 6 gVS/L(reactor)day in reactors (89-97%). An increment in biomethane production was associated with the higher abundance of the Methanothrix genus in the rGO-supported reactor (rG) than in the control reactor (rC).Öğe Investigation of the effects of magnetite addition on biohydrogen production from apple pulp waste(Elsevier Sci Ltd, 2023) Gokcek, Oznur Beguem; Bas, Furkan; Muratcobanoglu, Hamdi; Demirel, SevgiAlong with advancing technologies, the interest in producing renewable hydrogen by biological methods has recently increased due to its economic and eco-friendly properties. Various pretreatment methods or additives, such as enzymes and conductive materials, applied to increase the efficiency of biohydrogen production have been recently studied. In the current research, magnetite was utilized to increase the bioactivity of hydrogenproducing microorganisms during dark fermentation (DF). In the study, reactors with a S/I ratio of 2 gVS/gVS were set up, and magnetite was added at concentrations of 0, 50, 100, and 200 mg/L. The maximum biohydrogen production of 73.59 ml/gVS was obtained at 100 mg/L magnetite addition. Biohydrogen production increased by 46 % with 100 mg/L magnetite addition. In the magnetite-supported reactor, the dominant bacterial genera were Sporolactobacillus (39 %), Clostridium (15 %), and Coprothermobacter (10 %). It was thought that the change in microbial distribution positively affected biohydrogen production with the addition of magnetite.Öğe LINKAGE OF OPERATIONAL PARAMETERS AND MICROBIOME IN ANAEROBIC CO-DIGESTION WITH GRAPHITE(Yildiz Technical Univ, 2020) Demirel, Sevgi; Gokcek, Oznur Begum; Muratcobanoglu, HamdiIn terms of renewable energy sources, studies on increasing the amount of methane produced per unit feeding materials have attracted attention in recent years. Many different methods like chemical, physical, thermal, and thermochemical processes have been applied to anaerobic digesters for enhancing biogas production efficiency. Recently, besides these processes, supporting anaerobic digestion (AD) system with conductive materials like graphite, magnetite, activated carbon, etc. is one of the trend topics. In this paper, the effect of graphite on biogas/biomethane production potential was investigated for co-digestion of food waste (FW) and cow manure (CM). Additionally, the relationship between the distribution of anaerobic microbial structure and operational conditions is examined using Redundancy analysis (RDA) revealed that Clostridium could enhance to methanogenesis process through conductive materials such as graphite. These findings will improve the understanding of the mutual relationship between operational conditions and community composition in anaerobic digestion of food waste and cow manure mixture. As a result, the analysis of the correlation between microbiome and operational parameters indicated that Clostridium, Methanosaeta, and Methanosarcina, all together could enhance to methanogenesis process with the graphite supplementation.Öğe Optimum process condition determination for the treatment of Disperse Blue 60 dye by electrocoagulation with Taguchi method(Desalination Publ, 2020) Ozyonar, Fuat; Muratcobanoglu, Hamdi; Gokkus, OmurWastewater produced in textile processes cannot meet the discharge standards especially in terms of color content and therefore, the treatment demand occurs. In many studies, electrocoagulation has been used in the removal of dyestuff. High removal efficiency, lower space requirement, and easy controllability are the main advantages of the EC process. In this study, removal of Disperse Blue 60 of 100 mg L-1 by electrocoagulation with Taguchi method was investigated. In the reactor, monopolar-parallel connected Al anode and stainless steel cathode were used as electrode materials. The initial pH, current density, and electrocoagulation time were optimized and the effects of these parameters on the dye removal were employed at conductivities values. The operational conditions for EC process according to Taguchi model were employed as conductivity values of 500; 1,000; and 1,500 mu s cm(-1), pH 5, 6, and 7, current density (j) of 40, 80, and 100 mA cm(-2) and electrolysis time (t) of 2.5, 5, and electrolysis time 10 min. The highest removal efficiency (99%) was attained with the conductivity of 500 mu S cm(-1), pH 6, j = 80 mA cm(-2), and t = 10 min. However, only 34% of color were removed with the conductivity value of 500 mu s cm(-1), pH = 5 at j = 40 mA cm(-2) and t = 2.5 min.Öğe Simultaneous synergistic effects of graphite addition and co-digestion of food waste and cow manure: Biogas production and microbial community(Elsevier Sci Ltd, 2020) Muratcobanoglu, Hamdi; Gokcek, Oznur Begum; Mert, Ruhullah Ali; Zan, Recep; Demirel, SevgiThe effects of graphite on the anaerobic digestion of food waste (FW), cow manure (CM) and its mixture (FW/CM) via batch experiments under mesophilic conditions have been investigated in this study. Maximum biogas production with graphite addition for FW + 1 g/L, CM + 1.5 g/L and FW/CM + 0.75 g/L are 1128.46, 829.6 and 1471.1 mL/gVS respectively. Additionally, this study investigates the link between microbial community structure and biogas production when graphite addition of anaerobic digester was conducted. Based on 16S rRNA gene amplicon sequencing results, Aminiphilus (13-14%), Actinobaculum (13-15%) and Clostridium (12-18%) were the predominant bacterial genera in graphite-added FW, CM and FW/CM reactors, respectively. Comparatively higher biogas production of FW/CM synergistically affected by abundances of Clostridium as well as co-digestion in this anaerobic digestion setup. Methanosaeta was the most abundant methanogen in the graphite added digesters; however, the relative abundance of these genera was different.Öğe Taguchi approach for color removal using electrocoagulation with different electrode connection types(Parlar Scientific Publications, 2017) Ozyonar, Fuat; Muratcobanoglu, Hamdi; Gokkus, OmurIn this study, Taguchi experimental design method was applied to determine the optimum operating conditions for treatment of textile wastewater by electrocoagulation (EC) with aluminum-iron electrode pairs. The experimental parameters investigated were electrode connection type; initial pH (pHo): 5-8; conductivity (250-500 ?s/cm); and electrolysis time (5-20 min). These parameters were varied at four levels to see their effects on the removal efficiency. The results show that the electrocoagulation using Fe-Al electrode pairs with different connection modes were able to treat the dye wastewater. The maximum color removal percentage (99.8%) was achieved by the Fe-Al-Fe-Al electrode connection type, pH 6, current density of 75 mA/cm2, conductivity of 750 ?s/cm and 15 min electrolysis time for RO 16. On the other hand, optimum conditions were determined as Fe-Al-Fe-Al electrode connection mode, pH 6, current density of 75 mA/cm2, conductivity of 750 ?s/cm and 20 min electrolysis time for RR 239 and complete decolorization were obtained at these parametric conditions. © 2017 Parlar Scientific Publications. All rights reserved.Öğe TAGUCHI APPROACH FOR COLOR REMOVAL USING ELECTROCOAGULATION WITH DIFFERENT ELECTRODE CONNECTION TYPES(Parlar Scientific Publications (P S P), 2017) Ozyonar, Fuat; Muratcobanoglu, Hamdi; Gokkus, OmurIn this study, Taguchi experimental design method was applied to determine the optimum operating conditions for treatment of textile wastewater by electrocoagulation (EC) with aluminum-iron electrode pairs. The experimental parameters investigated were electrode connection type; initial pH (pH.): 5-8; conductivity (250-500 mu s/cm); and electrolysis time (5-20 min). These parameters were varied at four levels to see their effects on the removal efficiency. The results show that the electrocoagulation using Fe-Al electrode pairs with different connection modes were able to treat the dye wastewater. The maximum color removal percentage (99.8%) was achieved by the Fe-Al-Fe-Al electrode connection type, pH 6, current density of 75 mA/cm(2), conductivity of 750 mu s/cm and 15 min electrolysis time for RO 16. On the other hand, optimum conditions were determined as Fe-Al-Fe-Al electrode connection mode, pH 6, current density of 75 mA/cm(2), conductivity of 750 mu s/cm and 20 min electrolysis time for RR 239 and complete decolorization were obtained at these parametric conditions.Öğe The effect of reduced graphene oxide addition on methane production from municipal organic solid waste(Wiley, 2021) Gokcek, Oznur B.; Muratcobanoglu, Fatma; Muratcobanoglu, Hamdi; Ucar, Deniz; Mert, Ruhullah A.; Yildirim, Bilal; Zan, RecepBACKGROUND Conductive materials have become the focus of recent studies to accelerate and stabilize the conversion of organic wastes to methane in anaerobic digestion processes. In this study, the effect of the addition of reduced graphene oxide (rGO) on biogas/biomethane production from municipal organic solid wastes in anaerobic batch reactors was investigated. In this context, the effect of loading ratios (0, 0.5, 1 and 2 gVS inoculum (gVS nutrient)(-1)) and rGO addition at different concentrations (0, 10, 20 and 30 mg L-1) was examined during a 45-day study period. RESULTS The highest biogas production reached a level of 816 +/- 14 mL (gVS)(-1) when substrate/inoculum ratio was 1 and 20 mg L-1 rGO was added (50% more than the group without rGO added). Addition of 30 mg L-1 rGO resulted in 667 +/- 12 mL (gVS)(-1) corresponding to 23% higher biogas production compared to the control reactor without rGO. The highest cumulative biomethane production was observed to be 525 +/- 20 mL (gVS)(-1) in the reactor with 20 mg L-1 rGO added in which substrate/inoculum ratio was 1. In the reactors with 10 and 30 mg L-1 and without rGO addition biomethane productions were 448 +/- 21, 401 +/- 13 and 323 +/- 23 mL (gVS)(-1), respectively. CONCLUSIONS Results revealed that the addition of rGO increased biomethane production from municipal organic solid wastes. It is concluded that rGO addition has the potential to be applied for real-scale facilities within the scope of renewable energy production and circular economy. (c) 2021 Society of Chemical IndustryÖğe The impact of reduced graphene oxide (rGO) supplementation on cattle manure anaerobic digestion: Focusing on process performance and microbial syntrophy(Elsevier, 2021) Muratcobanoglu, Hamdi; Gokcek, Oznur Begum; Mert, Ruhullah Ali; Zan, Recep; Demirel, SevgiAt a time when there is a surge in demand for increasing renewable energy production, boosting biomethane production per unit organic matter/waste has become a big challenge and necessity. In this study, the effect of rGO addition on biomethane production from cow manure under mesophilic-batch conditions was investigated. Biomethane production was increased via rGO supplementation at appropriate concentrations. The highest biomethane production, which was 335 mL/gVS(ad) (65 % increase), was obtained by adding 20 mg/L rGO (CM20) while rGO addition slightly increased (up to 5.4 %) the CH4 content of biogas. The microbial community analysis indicated that via rGO supplementation, the dominant bacteria changed from Levilinea to Candidatus Cloacamonas and a more diverse archaeal community was formed. According to this study results, rGO supplementation could be used at biogas plants to boost renewable energy production.
