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Nuriye Altınay Perendeci
Department of Environmental Engineering, Akdeniz University, Antalya, Turkey

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Journal article
Published: 18 August 2021 in Journal of Environmental Management
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Lignocellulosic energy crops are promising feedstocks for producing renewable fuels, such as methane, that can replace diminishing fossil fuels. However, there is a major handicap in using lignocellulosic sources to produce biofuels, which is their low biodegradability. In this study, the application and the optimization of a lignocellulose pretreatment process, named alkaline hydrogen peroxide, was investigated for the enhancement of methane production from the energy crop switchgrass. Four independent process variables, solid content (3–7%), reaction temperature (50–100 °C), H2O2 concentration (1–3%), and reaction time (6–24 h), and three response variables, soluble reducing sugar, soluble chemical oxygen demand, and biochemical methane potential were used in process optimization and modeling. The optimization was performed by two different approaches as maximum methane production and cost minimization. The optimum conditions for the highest methane production were found as 6.65 wt% solid content, 50.6 °C reaction temperature, 2.94 wt% H2O2 concentration, and 16.05 h reaction time. The conditions providing the lowest cost were 6.43 wt% solid content, 50 °C reaction temperature, 1.83 wt% H2O2 concentration, and 6.78 h reaction time. For maximum methane production and cost minimization, specific methane yields of 338.52 mL CH4/g VS and 291.34 mL CH4/g VS were predicted with 62.4 % and 39.8 % enhancements compared to untreated switchgrass, respectively. Finally, it was found that the predicted methane production for the maximum methane production represents 77 % of the theoretical methane yield and 82.22 % energy recovery.

ACS Style

Ibrahim Alper Başar; Özge Çoban; Mehmet Yekta Göksungur; Çiğdem Eskicioğlu; Nuriye Altınay Perendeci. Enhancement of lignocellulosic biomass anaerobic digestion by optimized mild alkaline hydrogen peroxide pretreatment for biorefinery applications. Journal of Environmental Management 2021, 298, 113539 .

AMA Style

Ibrahim Alper Başar, Özge Çoban, Mehmet Yekta Göksungur, Çiğdem Eskicioğlu, Nuriye Altınay Perendeci. Enhancement of lignocellulosic biomass anaerobic digestion by optimized mild alkaline hydrogen peroxide pretreatment for biorefinery applications. Journal of Environmental Management. 2021; 298 ():113539.

Chicago/Turabian Style

Ibrahim Alper Başar; Özge Çoban; Mehmet Yekta Göksungur; Çiğdem Eskicioğlu; Nuriye Altınay Perendeci. 2021. "Enhancement of lignocellulosic biomass anaerobic digestion by optimized mild alkaline hydrogen peroxide pretreatment for biorefinery applications." Journal of Environmental Management 298, no. : 113539.

Journal article
Published: 09 July 2021 in Molecules
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Pretreatment and codigestion are proven to be effective strategies for the enhancement of the anaerobic digestion of lignocellulosic residues. The purpose of this study is to evaluate the effects of pretreatment and codigestion on methane production and the hydrolysis rate in the anaerobic digestion of agricultural wastes (AWs). Thermal and different thermochemical pretreatments were applied on AWs. Sewage sludge (SS) was selected as a cosubstrate. Biochemical methane potential tests were performed by mixing SS with raw and pretreated AWs at different mixing ratios. Hydrolysis rates were estimated by the best fit obtained with the first-order kinetic model. As a result of the experimental and kinetic studies, the best strategy was determined to be thermochemical pretreatment with sodium hydroxide (NaOH). This strategy resulted in a maximum enhancement in the anaerobic digestion of AWs, a 56% increase in methane production, an 81.90% increase in the hydrolysis rate and a 79.63% decrease in the technical digestion time compared to raw AWs. On the other hand, anaerobic codigestion (AcoD) with SS was determined to be ineffective when it came to the enhancement of methane production and the hydrolysis rate. The most suitable mixing ratio was determined to be 80:20 (Aws/SS) for the AcoD of the studied AWs with SS in order to obtain the highest possible methane production without any antagonistic effect.

ACS Style

Lütfiye Dumlu; Asli Ciggin; Stefan Ručman; N. Perendeci. Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste? Molecules 2021, 26, 4175 .

AMA Style

Lütfiye Dumlu, Asli Ciggin, Stefan Ručman, N. Perendeci. Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste? Molecules. 2021; 26 (14):4175.

Chicago/Turabian Style

Lütfiye Dumlu; Asli Ciggin; Stefan Ručman; N. Perendeci. 2021. "Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste?" Molecules 26, no. 14: 4175.

Journal article
Published: 10 May 2021 in Fermentation
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Various biotechnological approaches have been employed to convert food waste into value-added bioproducts through fermentation processes. Whey, a major waste generated by dairy industries, is considered an important environmental pollutant due to its massive production and high organic content. The purpose of this study is to investigate the effect of different fermentation parameters in simultaneous hydrolysis and fermentation (SHF) of whey for pigment production with Monascus purpureus. The submerged culture fermentation parameters optimized were type and pretreatment of whey, pH, inoculation ratio, substrate concentration and monosodium glutamate (MSG) concentration. Demineralized (DM), deproteinized (DP), and raw whey (W) powders were used as a substrate for pigment production by simultaneous hydrolysis and fermentation (SHF). The maximum red pigment production was obtained as 38.4 UA510 nm (absorbance units) at the optimized condition of SHF. Optimal conditions of SHF were 2% (v/v) inoculation ratio, 75 g/L of lactose as carbon source, 25 g/L of MSG as nitrogen source, and fermentation medium pH of 7.0. The specific growth rate of M. purpureus on whey and the maximum pigment production yield values were 0.023 h−1 and 4.55 UAd−1, respectively. This study is the first in the literature to show that DM whey is a sustainable substrate in the fermentation process of the M. purpureus red pigment.

ACS Style

Dilara Mehri; N. Perendeci; Yekta Goksungur. Utilization of Whey for Red Pigment Production by Monascus purpureus in Submerged Fermentation. Fermentation 2021, 7, 75 .

AMA Style

Dilara Mehri, N. Perendeci, Yekta Goksungur. Utilization of Whey for Red Pigment Production by Monascus purpureus in Submerged Fermentation. Fermentation. 2021; 7 (2):75.

Chicago/Turabian Style

Dilara Mehri; N. Perendeci; Yekta Goksungur. 2021. "Utilization of Whey for Red Pigment Production by Monascus purpureus in Submerged Fermentation." Fermentation 7, no. 2: 75.

Article
Published: 01 May 2021 in BioEnergy Research
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Eukaryotic microalgae and prokaryotic cyanobacteria can grow in various water and wastewater types, and both can grow biomass by taking nutrients and converting atmospheric CO2 into useful products. Biofuels obtained by processing this landless grown biomass are defined as “third-generation biofuels”. In this study, the effects of hydrodynamic cavitation (HC)-assisted NaOH pretreatment on methane production from cyanobacteria were investigated. Cyanobacterial biomass was isolated from thermal springs located in the southwest of Turkey (Denizli-Turkey) and identified as Desertifilum tharense. Desertifilum tharense biomass was grown on a laboratory scale, and along with its compositional characteristics, culture-specific parameters were determined. HC-assisted NaOH pretreatment was applied to evaluate optimum process conditions for enhancing methane production from D. tharense. In the experimental design, process parameters of cavitation number (Cv: 0.3-0.7), NaOH concentration (0–4%), solid content (1.5%), reaction time (4h), and reaction temperature (30°C) were combined to reveal the parameter-specific impact of HC pretreatment. The effect of the HC-assisted NaOH pretreatment was further investigated with molecular-bond and surface structure characterization. Along with the energy equivalent of obtained biofuel, energy requirements for cultivation, harvesting, pretreatment, and anaerobic digestion (AD) were calculated to determine the process’s overall energy efficiency. Kinetic parameters of raw and pretreated D. tharense were determined by first-order, cone, modified Gompertz, and reaction curve models. The results revealed that by the application of pretreatment, a 2-35.3% soluble COD increase was achieved, whereas methane production was increased from 241.5 to 290.6 mLCH4 gVS−1. Application of HC with a low Cv of 0.3 boosted methane production up to 20.3% compared to the raw D. tharense.

ACS Style

Mona Fardinpoor; N. Altınay Perendeci; Vedat Yılmaz; Burcu Ertit Taştan; Fatih Yılmaz. Effects of Hydrodynamic Cavitation-Assisted NaOH Pretreatment on Biofuel Production from Cyanobacteria: Promising Approach. BioEnergy Research 2021, 1 -14.

AMA Style

Mona Fardinpoor, N. Altınay Perendeci, Vedat Yılmaz, Burcu Ertit Taştan, Fatih Yılmaz. Effects of Hydrodynamic Cavitation-Assisted NaOH Pretreatment on Biofuel Production from Cyanobacteria: Promising Approach. BioEnergy Research. 2021; ():1-14.

Chicago/Turabian Style

Mona Fardinpoor; N. Altınay Perendeci; Vedat Yılmaz; Burcu Ertit Taştan; Fatih Yılmaz. 2021. "Effects of Hydrodynamic Cavitation-Assisted NaOH Pretreatment on Biofuel Production from Cyanobacteria: Promising Approach." BioEnergy Research , no. : 1-14.

Journal article
Published: 12 March 2021 in Energy
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In this study, the development of an environmentally friendly version of hydrogen peroxide – acetic acid (HPAC) pretreatment was investigated and optimized with two different approaches as maximum biofuel production optimization and cost optimization. Central composite design and response surface method were used for the experimental design and data analysis, respectively. In the experimental design, investigated HPAC pretreatment parameters were 50–100 °C reaction temperature, 6–24 h reaction time, 0–2 wt% HAc and 0–2 wt% H2O2. Significant ethanol production enhancement was observed only for the samples pretreated at 100 °C. This increase was due to the enhanced enzyme accessibility by the surface area increment and delignification, which were also revealed in SEM imaging and FTIR analysis. Maximum ethanol production was observed in 2% H2O2, 0% HAc, 24 h, and 100 °C pretreatment conditions as 81.65 mg EtOH/g total solid (TS) (103.49 L EtOH/tonne TS), corresponding 49.55% of the theoretical ethanol yield. Maximum methane production, on the other hand, was observed in 2% HAc, 0% H2O2, 100 °C, 6 h conditions as 363.82 mL CH4/g VS. In terms of net energy production, cost optimum pretreatment (1.87% HAc, 0% H2O2, 50 °C, and 6 h) was found be the most beneficial condition with 67.5% energy recovery.

ACS Style

Ibrahim Alper Başar; Nuriye Altınay Perendeci. Optimization of zero-waste hydrogen peroxide - Acetic acid pretreatment for sequential ethanol and methane production. Energy 2021, 225, 120324 .

AMA Style

Ibrahim Alper Başar, Nuriye Altınay Perendeci. Optimization of zero-waste hydrogen peroxide - Acetic acid pretreatment for sequential ethanol and methane production. Energy. 2021; 225 ():120324.

Chicago/Turabian Style

Ibrahim Alper Başar; Nuriye Altınay Perendeci. 2021. "Optimization of zero-waste hydrogen peroxide - Acetic acid pretreatment for sequential ethanol and methane production." Energy 225, no. : 120324.

Journal article
Published: 27 November 2020 in Journal of Environmental Chemical Engineering
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Co-digestion is an efficient way to utilize different substrates to achieve better methane production and waste management. In this study, anaerobic co-digestion of vinasse (V), pomace (P) and aniseed (A) at 13 different ratio combinations were evaluated from the point of methane production performances. The methane production potentials of aniseed, vinasse, and pomace were determined as 444.1, 367.9, and 116.8 mL CH4 g-1 VSadded, respectively. The highest synergistic and antagonistic effects were obtained as 1.09 and 0.81 along with the 205.8 mL CH4 g-1 VSadded and 257.1 mL CH4 g-1 VSadded methane production potentials from the co-digested samples having ratios as A:V:P = 0:70:30 and A:V:P = 20:60:20, respectively. The co-digestion of aniseed with vinasse showed a positive impact on the methane production compared to pomace added co-digestion methane potentials. Addition of vinasse to pomace as a co-substrate improved the methane productions. The methane contents of produced biogas ranged between 56 and 67%. First Order, Cone, Modified Gompertz, and Reaction Curve models were applied to predict the methane production potentials. The R2 values were calculated between 0.914 and 0.999 for the models. The ratio of A:V:P = 33:33:33 for the evaluation of alcohol distillery wastes from raki production by anaerobic co-digestion found as an appropriate option due to provide utilization of all wastes and adequate methane production. The findings of this study provided useful information for the evaluation of alcohol distillery wastes as a renewable energy source and gave perspective about the practical application of the co-digestion process for industry as a waste management alternative.

ACS Style

F. Yilmaz; E. Kökdemir Ünşar; N.A. Perendeci; E. Sahinkaya. Energy generation from multifarious wastes of alcohol distillery raki production process: Kinetic modeling of methane production. Journal of Environmental Chemical Engineering 2020, 9, 104838 .

AMA Style

F. Yilmaz, E. Kökdemir Ünşar, N.A. Perendeci, E. Sahinkaya. Energy generation from multifarious wastes of alcohol distillery raki production process: Kinetic modeling of methane production. Journal of Environmental Chemical Engineering. 2020; 9 (1):104838.

Chicago/Turabian Style

F. Yilmaz; E. Kökdemir Ünşar; N.A. Perendeci; E. Sahinkaya. 2020. "Energy generation from multifarious wastes of alcohol distillery raki production process: Kinetic modeling of methane production." Journal of Environmental Chemical Engineering 9, no. 1: 104838.

Thematic issue
Published: 28 May 2020 in Environmental Earth Sciences
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This paper explored the positive attributes of aerobic membrane bioreactor for recycling and reuse of domestic wastewater for irrigation. For this purpose, performances of two different full-scale treatment plants, one designed as aerobic membrane bioreactor (AMBR) equipped with a hollow fiber membrane with a nominal pore size of 0.03 μm, and the other, as a conventional nitrogen removal activated sludge plant with pre-denitrification (A2O) were evaluated and compared. The effluent of the A2O system included an average of 109 mg L−1 chemical oxygen demand (COD), 32 mg L−1 total suspended solids (TSS) and 17 mg L−1 of total nitrogen. The AMBR system was able to reduce the effluent COD level to 24 mg L−1, obviously with lower TSS and turbidity. The effluent quality of the AMBR was in compliance with irrigation water standards; its nitrogen content should be evaluated as an added nutritional value for most plants. Considering the additional profit of the recovered water, the investment and operational costs of A2O and AMBR processes were compatible. The results underlined the merit of AMBR process, especially in low populated areas also requiring resources for irrigation.

ACS Style

Fatih Yilmaz; M. M. Otuzaltı; N. A. Perendeci; M. Karatay; E. Kökdemir Ünşar; M. Ateş; R. Akin; O. Yıldız; D. Orhon. Potential of aerobic membrane bioreactor for recycling and reuse of domestic wastewater for irrigation. Environmental Earth Sciences 2020, 79, 1 -11.

AMA Style

Fatih Yilmaz, M. M. Otuzaltı, N. A. Perendeci, M. Karatay, E. Kökdemir Ünşar, M. Ateş, R. Akin, O. Yıldız, D. Orhon. Potential of aerobic membrane bioreactor for recycling and reuse of domestic wastewater for irrigation. Environmental Earth Sciences. 2020; 79 (11):1-11.

Chicago/Turabian Style

Fatih Yilmaz; M. M. Otuzaltı; N. A. Perendeci; M. Karatay; E. Kökdemir Ünşar; M. Ateş; R. Akin; O. Yıldız; D. Orhon. 2020. "Potential of aerobic membrane bioreactor for recycling and reuse of domestic wastewater for irrigation." Environmental Earth Sciences 79, no. 11: 1-11.

Journal article
Published: 02 April 2020 in Waste Management
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This paper investigated the effect of alkaline hydrothermal pretreatment (HTP) on the hydrolysis, biodegradation and methane generation potential of waste activated sludge (WAS). A multi-variable experimental approach was designed, where initial solids content (1–5%), reaction temperature (130–190 °C), reaction time (10–30 min.) and caustic concentration (0–0.2 mgNaOH/mgVS) were varied in different combinations to assess the impact of alkaline HTP. This process significantly enhanced the hydrolysis of organic compounds in sludge into soluble fractions, whereby increasing the chemical oxygen demand (COD) leakage up to 200–900% with the 17–99% solubility. It boosted volatile solids (VS) biodegradation up to 40%, which resulted in a parallel increase in methane generation from 216 mLCH4/gVS to as high a 456 mLCH4/gVS methane generation basically relied on the conversion of solubilized COD. Alkaline HTP process was optimized for the maximum methane production. Optimum conditions were obtained at 190 °C reaction temperature, 10 min. reaction time, 0.2 mgNaOH/mgVS and 5% dry matter content. Under these conditions, 453.8 mLCH4/gVS was predicted. Biochemical methane potential (BMP) value was determined as 464 mLCH4/gVS supporting predictive power of the BMP model. The biodegradability compared to the untreated raw WAS was enhanced 78.2%.

ACS Style

N.A Perendeci; A.S. Ciggin; E. Kökdemir Ünşar; D. Orhon. Optimization of alkaline hydrothermal pretreatment of biological sludge for enhanced methane generation under anaerobic conditions. Waste Management 2020, 107, 9 -19.

AMA Style

N.A Perendeci, A.S. Ciggin, E. Kökdemir Ünşar, D. Orhon. Optimization of alkaline hydrothermal pretreatment of biological sludge for enhanced methane generation under anaerobic conditions. Waste Management. 2020; 107 ():9-19.

Chicago/Turabian Style

N.A Perendeci; A.S. Ciggin; E. Kökdemir Ünşar; D. Orhon. 2020. "Optimization of alkaline hydrothermal pretreatment of biological sludge for enhanced methane generation under anaerobic conditions." Waste Management 107, no. : 9-19.

Journal article
Published: 23 January 2020 in Molecules
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The increasing population creates excess pressure on the plantation and production of fruits and vegetables across the world. Consumption demand during the whole year has made production compulsory in the covered production system (greenhouse). Production, harvesting, processing, transporting, and distribution chains of fruit and vegetables have resulted in a huge amount of wastes as an alternative source to produce biofuels. In this study, optimization of two pretreatment processes (NaOH and HCl assisted thermal) was investigated to enhance methane production from fruit and vegetable harvesting wastes (FVHW) that originate from greenhouses. NaOH concentration (0–6.5%), HCl concentration (0–5%), reaction temperature (60–100 °C), solid content (1–5%), time of reaction (1–5 h), and mixing speed (0–500 rpm) were chosen in a wide range of levels to optimize the process in a broad design boundary and to evaluate the positive and negative impacts of independent variables along with their ranges. Increasing NaOH and HCl concentrations resulted in higher COD solubilization but decreased the concentration of soluble sugars that can be converted directly into methane. Thus, the increasing concentrations of NaOH and HCl in the pretreatments have resulted in low methane production. The most important independent variables impacting COD and sugar solubilization were found to be chemical concentration (as NaOH and HCl), solid content and reaction temperature for the optimization of pretreatment processes. The high amount of methane productions in the range of 222–365 mL CH4 gVS−1 was obtained by the simple thermal application without using chemical agents as NaOH or HCl. Maximum enhancement of methane production was 47–68% compared to raw FVHW when 5% solid content, 1-hour reaction time and 60–100 °C reaction temperature were applied in pretreatments.

ACS Style

Ümmihan Günerhan; Ender Us; Lütfiye Dumlu; Vedat Yılmaz; Hélène Carrère; Altınay.N. Perendeci. Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization. Molecules 2020, 25, 500 .

AMA Style

Ümmihan Günerhan, Ender Us, Lütfiye Dumlu, Vedat Yılmaz, Hélène Carrère, Altınay.N. Perendeci. Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization. Molecules. 2020; 25 (3):500.

Chicago/Turabian Style

Ümmihan Günerhan; Ender Us; Lütfiye Dumlu; Vedat Yılmaz; Hélène Carrère; Altınay.N. Perendeci. 2020. "Impacts of Chemical-Assisted Thermal Pretreatments on Methane Production from Fruit and Vegetable Harvesting Wastes: Process Optimization." Molecules 25, no. 3: 500.

Journal article
Published: 10 December 2019 in Renewable Energy
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The production of bioethanol and subsequent methane from two raw switchgrass varieties with the addition of cellulase and β-glucosidase dose combinations was investigated in this study. Maximum ethanol production increment for the investigated varieties, Shawneé and Kanlow, were determined as 211.9% and 166.7%, respectively, compared to the control assays without enzymes. Considering higher ethanol production a priority, 42.0 mg EtOH/gVS and 223.5 mLCH4/gVS were produced from Shawneé variety at 50 EGU cellulase – 80 IU β-glucosidase doses. 20.2 mgEtOH/gVS, and 400.7 mLCH4/gVS were produced from Kanlow variety at 75 EGU cellulase – 80 IU β-Glucosidase doses. Furthermore, the highest total biofuel energy productions were found as 10750,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 20 IU β-glucosidase doses for Shawneé and 13556,9 MJ/tonne field dried switchgrass at 75 EGU cellulase – 80 IU β-glucosidase doses for Kanlow. Shawneé variety was found to be more suitable for cellulosic ethanol production.

ACS Style

I.A. Başar; E. Kökdemir Ünşar; H. Ünyay; N.A. Perendeci. Ethanol, methane, or both? Enzyme dose impact on ethanol and methane production from untreated energy crop switchgrass varieties. Renewable Energy 2019, 149, 287 -297.

AMA Style

I.A. Başar, E. Kökdemir Ünşar, H. Ünyay, N.A. Perendeci. Ethanol, methane, or both? Enzyme dose impact on ethanol and methane production from untreated energy crop switchgrass varieties. Renewable Energy. 2019; 149 ():287-297.

Chicago/Turabian Style

I.A. Başar; E. Kökdemir Ünşar; H. Ünyay; N.A. Perendeci. 2019. "Ethanol, methane, or both? Enzyme dose impact on ethanol and methane production from untreated energy crop switchgrass varieties." Renewable Energy 149, no. : 287-297.

Journal article
Published: 20 February 2019 in Bioresource Technology
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Twenty one species of microalgae and Cyanobacteria were isolated from different ecosystems in Turkey to investigate the relation between biochemical methane potential (BMP) and biochemical characterization. Since the highest dry weight (X), specific growth rate (µ) and maximum productivity (Pmax) were obtained from the five species, identification of species and BMP tests with the composition analyzes were examined. BMP values were determined 308, 293, 242, 229 and 230 mLCH4/gVS for Desertifilum tharense, Phormidium animale, Chlorella sp., Anabeana variabilis and Chlorophyta uncultured. The Pearson correlation and principal component analysis (PCA) were applied to extract and clarify the correlation between composition of species and their methane production. Pearson correlation shows that glucose, Kjeldahl nitrogen and chlorophyll are highly and positively correlated with BMP. PCA revealed that Chlorella sp., Chlorophyta uncultured and Desertifilum tharense were placed against Phormidium animale distinguished by its extreme and different profile because of Kjeldahl nitrogen and glucose content.

ACS Style

N.A. Perendeci; V. Yılmaz; B. Ertit Taştan; S. Gökgöl; M. Fardinpoor; A. Namlı; Jean-Philippe Steyer. Correlations between biochemical composition and biogas production during anaerobic digestion of microalgae and cyanobacteria isolated from different sources of Turkey. Bioresource Technology 2019, 281, 209 -216.

AMA Style

N.A. Perendeci, V. Yılmaz, B. Ertit Taştan, S. Gökgöl, M. Fardinpoor, A. Namlı, Jean-Philippe Steyer. Correlations between biochemical composition and biogas production during anaerobic digestion of microalgae and cyanobacteria isolated from different sources of Turkey. Bioresource Technology. 2019; 281 ():209-216.

Chicago/Turabian Style

N.A. Perendeci; V. Yılmaz; B. Ertit Taştan; S. Gökgöl; M. Fardinpoor; A. Namlı; Jean-Philippe Steyer. 2019. "Correlations between biochemical composition and biogas production during anaerobic digestion of microalgae and cyanobacteria isolated from different sources of Turkey." Bioresource Technology 281, no. : 209-216.

Original paper
Published: 09 November 2018 in Waste and Biomass Valorization
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Increase of population has a significant effect on energy demand which results in depletion of fossil fuels, and this causes a search for alternative renewable energy sources. One of these alternatives is production of bioenergy and biofuel from renewable and non-food feedstocks such as lignocellulosic biomass and biowaste. However, lignocellulosic biomass needs pretreatment because of its complex structure. Effectiveness of thermal–alkaline H2O2 pretreatment process and determination of its optimum conditions using central composite design of RSM were evaluated for the enhancement of methane production from banana harvesting residues. Optimum process conditions for cost driven approach was determined as 50 °C reaction temperature, 2.73% H2O2 concentration and 6 h reaction time. As a result of pretreatment at optimum conditions, 40% increase on biochemical methane potential was obtained with 290 mLCH4/gVS methane production. SEM and FTIR results revealed surface disruption and lignin removal impacts of pretreatment, respectively. Thermal–alkaline H2O2 pretreatment was determined as an effective pretreatment process for banana harvesting residues.

ACS Style

Fatih Yilmaz; Elçin Kökdemir Ünşar; Nuriye Altınay Perendeci. Enhancement of Methane Production from Banana Harvesting Residues: Optimization of Thermal–Alkaline Hydrogen Peroxide Pretreatment Process by Experimental Design. Waste and Biomass Valorization 2018, 10, 3071 -3087.

AMA Style

Fatih Yilmaz, Elçin Kökdemir Ünşar, Nuriye Altınay Perendeci. Enhancement of Methane Production from Banana Harvesting Residues: Optimization of Thermal–Alkaline Hydrogen Peroxide Pretreatment Process by Experimental Design. Waste and Biomass Valorization. 2018; 10 (10):3071-3087.

Chicago/Turabian Style

Fatih Yilmaz; Elçin Kökdemir Ünşar; Nuriye Altınay Perendeci. 2018. "Enhancement of Methane Production from Banana Harvesting Residues: Optimization of Thermal–Alkaline Hydrogen Peroxide Pretreatment Process by Experimental Design." Waste and Biomass Valorization 10, no. 10: 3071-3087.

Journal article
Published: 06 August 2018 in Chemosphere
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Fe2O3 and Al2O3 nanoparticles are widely used in production products and find their way to wastewater treatment plants through the contact of water with products. In this study, impacts of Fe2O3 and Al2O3 nanoparticles on methane potential of waste activated sludge (WAS) were investigated by comparing long and short term toxicity test results, modelling and FISH analysis. Methane production from the samples treated with the maximum concentration of Fe2O3 nanoparticles decreased 28.9% at the end of the long term BMP test. EC50 value for BMP test of the Fe2O3 nanoparticles was calculated as 901.94 mg/gTS with high coefficient of determination. Methane production from the samples treated with Al2O3 nanoparticles increased up to 14.8% (p > 0.05) at the end of the BMP test. However, short term toxicity tests for Fe2O3 and Al2O3 nanoparticles showed no impact on anaerobic digestion of WAS. Kinetic parameters obtained from models and captured FISH images were consistent with these results. Different impacts of nanoparticles on methane production suggested that anaerobic microorganisms can be affected from nanoparticles in various mechanisms. Hydrolysis (kH) and overall reaction rates (kR) values were determined as 0.0277 and 0.1441 d−1, respectively for each concentration of Al2O3 nanoparticles and raw WAS. Similarly, methane production from WAS containing 5, 50, 150 and 250 mgFe2O3/gTS were modeled with same kinetic values. However, kH constant was calculated as 0.0149 d−1 for 500 mgFe2O3/gTS. This means that Fe2O3 nanoparticles starting from this concentration inhibited the methanogenic consortium and caused decreased biogas production and spesific methane production rate.

ACS Style

Elçin Kökdemir Ünşar; Nuriye Altınay Perendeci. What kind of effects do Fe2O3 and Al2O3 nanoparticles have on anaerobic digestion, inhibition or enhancement? Chemosphere 2018, 211, 726 -735.

AMA Style

Elçin Kökdemir Ünşar, Nuriye Altınay Perendeci. What kind of effects do Fe2O3 and Al2O3 nanoparticles have on anaerobic digestion, inhibition or enhancement? Chemosphere. 2018; 211 ():726-735.

Chicago/Turabian Style

Elçin Kökdemir Ünşar; Nuriye Altınay Perendeci. 2018. "What kind of effects do Fe2O3 and Al2O3 nanoparticles have on anaerobic digestion, inhibition or enhancement?" Chemosphere 211, no. : 726-735.

Journal article
Published: 20 July 2018 in Molecules
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This paper intended to explore the effect of alkaline H2O2 pretreatment on the biodegradability and the methane generation potential of greenhouse crop waste. A multi-variable experimental design was implemented. In this approach, initial solid content (3–7%), reaction time (6–24 h), H2O2 concentration (1–3%), and reaction temperature (50–100 °C) were varied in different combinations to determine the impact of alkaline H2O2 pretreatment. The results indicated that the alkaline H2O2 pretreatment induced a significant increase in the range of 200–800% in chemical oxygen demand (COD) leakage into the soluble phase, and boosted the methane generation potential from 174 mLCH4/g of volatile solid (VS) to a much higher bracket of 250–350 mLCH4/gVS. Similarly, the lignocellulosic structure of the material was broken down and hydrolyzed by H2O2 dosing, which increased the rate of volatile matter utilization from 31% to 50–70% depending on selected conditions. Alkaline H2O2 pretreatment was optimized to determine optimal conditions for the enhancement of methane generation assuming a cost-driven approach. Optimal alkaline H2O2 pretreatment conditions were found as a reaction temperature of 50 °C, 7% initial solid content, 1% H2O2 concentration, and a reaction time of six h. Under these conditions, the biochemical methane potential (BMP) test yielded as 309 mLCH4/gVS. The enhancement of methane production was calculated as 77.6% compared to raw greenhouse crop wastes.

ACS Style

N. Altınay Perendeci; Sezen Gökgöl; Derin Orhon. Impact of Alkaline H2O2 Pretreatment on Methane Generation Potential of Greenhouse Crop Waste under Anaerobic Conditions. Molecules 2018, 23, 1794 .

AMA Style

N. Altınay Perendeci, Sezen Gökgöl, Derin Orhon. Impact of Alkaline H2O2 Pretreatment on Methane Generation Potential of Greenhouse Crop Waste under Anaerobic Conditions. Molecules. 2018; 23 (7):1794.

Chicago/Turabian Style

N. Altınay Perendeci; Sezen Gökgöl; Derin Orhon. 2018. "Impact of Alkaline H2O2 Pretreatment on Methane Generation Potential of Greenhouse Crop Waste under Anaerobic Conditions." Molecules 23, no. 7: 1794.

Original articles
Published: 17 May 2018 in International Journal of Green Energy
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In this study, real-scale wastewater treatment plant (Hurma WWTP) sludge anaerobic digestion process was modeled by Anaerobic Digestion Model (ADM1) with the purpose of generating the data to understand the process better by contributing to the prediction of the process operational conditions and process performance, which will be a base for future anaerobic sludge stabilization process investments. Real-scale anaerobic sludge digestion process data was evaluated in terms of known process and state variables and also process yields. Average VS removal yield, methane production yield, and methane production rate values of the anaerobic sludge digestion unit were calculated as 46.4%, 0.49 m3CH4/kg VSremoved, and 0.33 m3 CH4/m3day, respectively. In this study, ADM1 was intended to predict the behavior of real-scale anaerobic digester processing sewage sludge under dynamic conditions. To estimate the variables of real-scale sludge anaerobic digestion process with high accuracy and to provide high model prediction performance, values of the four parameters (disintegration rate constant, carbohydrate hydrolysis rate constant, protein hydrolysis rate constant, and lipid hydrolysis rate constant) that have strong effects on structured ADM1 were estimated by using the parameter estimation module in Aquasim program and their values were found as 0.101, 10, 10, and 9.99, respectively. When the numbers of kinetic parameters with the processes included in ADM1 along with the dynamic and non-linear structure of the real scale anaerobic digestion were taken into consideration, model simulations were in good agreement with measured results of the biogas flow rate, methane flow rate, pH, total alkalinity, and volatile fatty acids.

ACS Style

Murat Mert Otuzalti; Nuriye Altınay Perendeci. Modeling of real scale waste activated sludge anaerobic digestion process by Anaerobic Digestion Model 1 (ADM1). International Journal of Green Energy 2018, 15, 454 -464.

AMA Style

Murat Mert Otuzalti, Nuriye Altınay Perendeci. Modeling of real scale waste activated sludge anaerobic digestion process by Anaerobic Digestion Model 1 (ADM1). International Journal of Green Energy. 2018; 15 (7):454-464.

Chicago/Turabian Style

Murat Mert Otuzalti; Nuriye Altınay Perendeci. 2018. "Modeling of real scale waste activated sludge anaerobic digestion process by Anaerobic Digestion Model 1 (ADM1)." International Journal of Green Energy 15, no. 7: 454-464.

Journals
Published: 04 January 2016 in Environmental Science: Processes & Impacts
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In this study, long and short term inhibition impacts of Ag, CuO and CeO2nanoparticles (NPs) on anaerobic digestion (AD) of waste activated sludge (WAS) were investigated.

ACS Style

E. Kökdemir Ünşar; Asli Seyhan Ciggin; A. Erdem; N. A. Perendeci. Long and short term impacts of CuO, Ag and CeO2nanoparticles on anaerobic digestion of municipal waste activated sludge. Environmental Science: Processes & Impacts 2016, 18, 277 -288.

AMA Style

E. Kökdemir Ünşar, Asli Seyhan Ciggin, A. Erdem, N. A. Perendeci. Long and short term impacts of CuO, Ag and CeO2nanoparticles on anaerobic digestion of municipal waste activated sludge. Environmental Science: Processes & Impacts. 2016; 18 (2):277-288.

Chicago/Turabian Style

E. Kökdemir Ünşar; Asli Seyhan Ciggin; A. Erdem; N. A. Perendeci. 2016. "Long and short term impacts of CuO, Ag and CeO2nanoparticles on anaerobic digestion of municipal waste activated sludge." Environmental Science: Processes & Impacts 18, no. 2: 277-288.

Journal article
Published: 01 January 2016 in Pamukkale University Journal of Engineering Sciences
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ACS Style

Elcin Kokdemir Ünşar; Altınay Perendeci. Environmental fate of nanoparticles and their impacts on anaerobic digestion process. Pamukkale University Journal of Engineering Sciences 2016, 22, 503 -512.

AMA Style

Elcin Kokdemir Ünşar, Altınay Perendeci. Environmental fate of nanoparticles and their impacts on anaerobic digestion process. Pamukkale University Journal of Engineering Sciences. 2016; 22 (6):503-512.

Chicago/Turabian Style

Elcin Kokdemir Ünşar; Altınay Perendeci. 2016. "Environmental fate of nanoparticles and their impacts on anaerobic digestion process." Pamukkale University Journal of Engineering Sciences 22, no. 6: 503-512.

Articles
Published: 27 August 2013 in DESALINATION AND WATER TREATMENT
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Reaction kinetics during electrochemical treatment of deproteinated whey wastewater (DWW) and fruit juice factory wastewater (FJW) was investigated in a stirred batch electrochemical reactor under reaction conditions of 100% wastewater concentration and 11.29 V applied voltage at room temperature using cost-effective iron electrodes. Reaction mediums for electrochemical treatment of DWW and FJW were supplemented with 19.87 and 5.95 g L−1 NaCl as supporting electrolyte, respectively. Kinetic investigations denoted that reaction orders (n) of both reactions were 0.6. Specific reaction rate constants (k) at 25°C of electrochemical DWW and FJW treatment reactions were 0.04 and 1.21 mg0.6 L−0.6 min−1. Activation energies (Ea) and Arrhenius constants (A) were calculated as 41.60–9.59 kJ mol−1 and 740.93–61.82 mg0.6 L−06 min−1 for DWW and FJW, respectively. In our study, relatively fast reaction kinetics values were obtained compared to the data previously reported for electrochemical wastewater treatment in the literature. These results support the applicability of electrochemical treatment to the deproteinated whey and fruit juice factory wastewaters as an advanced post-treatment method providing further research.

ACS Style

Güray Güven; N. Altιnay Perendeci; Abdurrahman Tanyolaç. Reaction kinetics on treatment of food industry wastewaters by electrochemical oxidation. DESALINATION AND WATER TREATMENT 2013, 52, 7092 -7100.

AMA Style

Güray Güven, N. Altιnay Perendeci, Abdurrahman Tanyolaç. Reaction kinetics on treatment of food industry wastewaters by electrochemical oxidation. DESALINATION AND WATER TREATMENT. 2013; 52 (37):7092-7100.

Chicago/Turabian Style

Güray Güven; N. Altιnay Perendeci; Abdurrahman Tanyolaç. 2013. "Reaction kinetics on treatment of food industry wastewaters by electrochemical oxidation." DESALINATION AND WATER TREATMENT 52, no. 37: 7092-7100.

Journals
Published: 04 January 2013 in Environmental Science: Processes & Impacts
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Microbial community dynamics and the overall system performance of a real scale anaerobic wastewater treatment plant treating sugar industry wastewater were studied. Dominant bacterial and archaeal communities were monitored by 16S rRNA gene targeted PCR amplification and single strand conformation polymorphism analysis (SSCP). Chemical oxygen demand (COD) removal efficiency and operational parameters such as pH, temperature, alkalinity, volatile fatty acids in the methanogenic reactor remained within respective optimal ranges. All bacterial profiles in acidogenic and methanogenic reactors and in the lamella separator presented complex patterns; and the bacterial diversity, measured as SSCP profile richness and structure, was quite chaotic. In contrast to the results obtained for the bacterial community, archaeal 16S rDNA patterns in acidogenic and methanogenic reactors and the lamella separator remained relatively stable over the whole operation period of the anaerobic wastewater treatment plant. Evaluation of microbial community dynamics and overall system performance using the Mantel test revealed that there was no correlation between the dynamics of the microbial communities and the abiotic parameters.

ACS Style

N. Altınay Perendeci; F. Yeşim Ekinci; Jean Jaques Godon. Monitoring the performance and microbial diversity dynamics of a full scale anaerobic wastewater treatment plant treating sugar factory wastewater. Environmental Science: Processes & Impacts 2013, 15, 494 -502.

AMA Style

N. Altınay Perendeci, F. Yeşim Ekinci, Jean Jaques Godon. Monitoring the performance and microbial diversity dynamics of a full scale anaerobic wastewater treatment plant treating sugar factory wastewater. Environmental Science: Processes & Impacts. 2013; 15 (2):494-502.

Chicago/Turabian Style

N. Altınay Perendeci; F. Yeşim Ekinci; Jean Jaques Godon. 2013. "Monitoring the performance and microbial diversity dynamics of a full scale anaerobic wastewater treatment plant treating sugar factory wastewater." Environmental Science: Processes & Impacts 15, no. 2: 494-502.

Journal article
Published: 06 February 2012 in Journal of Chemical Technology & Biotechnology
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BACKGROUND: Specific energy consumption (SEC) is an important factor in electrochemical treatment of wastewaters. SEC during electrochemical treatment of food industry wastewaters, specifically deproteinated whey wastewater (DWW), simulated sugar beet factory wastewater (SFW) and fruit juice factory wastewater (FJW), were investigated in this study. The effects of operational parameters applied voltage, and electrolyte and wastewater concentrations on SEC were assessed and optimized. RESULTS: SEC values were found in the range of 0.27–148.65, 0.94–375.76 and 0.20–636.40 kWh (kg COD)−1 for DWW, SFW and FJW, respectively, after 8 h of reaction. Operational parameters were optimized at 25 °C through response surface methodology (RSM) where applied voltage was kept in the range (2–12 V), wastewater concentration and COD removal percent were maximized electrolyte concentration and SEC were minimized. Optimum conditions were estimated as 7.73 V applied voltage and 100% wastewater concentration in the presence of 27.11 g L−1 supporting electrolyte concentration to achieve 25.02, 67.74 and 43.10% COD removal for DWW, SFW and FJW with corresponding SEC values of 17.85, 22.79 and 80.47 kWh (kg COD)−1, respectively. CONCLUSIONS: Providing further research on the reduction of SEC values, application of electrochemical treatment to food industry wastewaters with non‐biodegradable components may become an alternative to conventional methods. Copyright © 2012 Society of Chemical Industry

ACS Style

Güray Güven; Altunay Perendeci; Koray Özdemir; Abdurrahman Tanyolaç. Specific energy consumption in electrochemical treatment of food industry wastewaters. Journal of Chemical Technology & Biotechnology 2012, 87, 513 -522.

AMA Style

Güray Güven, Altunay Perendeci, Koray Özdemir, Abdurrahman Tanyolaç. Specific energy consumption in electrochemical treatment of food industry wastewaters. Journal of Chemical Technology & Biotechnology. 2012; 87 (4):513-522.

Chicago/Turabian Style

Güray Güven; Altunay Perendeci; Koray Özdemir; Abdurrahman Tanyolaç. 2012. "Specific energy consumption in electrochemical treatment of food industry wastewaters." Journal of Chemical Technology & Biotechnology 87, no. 4: 513-522.