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Dr. Çağrı Akyol
Department of Science and Engineering of Materials, Environment and Urban Planning-SIMAU, Marche Polytechnic University, 60131, Ancona, Italy

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0 Anaerobic Digestion
0 Resource Recovery
0 composting
0 Environmental Sustainability
0 Water and wastewater treatment

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Anaerobic Digestion
composting
Resource Recovery
Water and wastewater treatment

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Review article
Published: 23 July 2021 in ACS Sustainable Chemistry & Engineering
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Anaerobic processes are proven to have much more environmental and economic benefits than conventional aerobic treatment systems, offering sustainable energy and valuable biochemicals. In recent years, bio-based volatile fatty acid (VFA) production has come into prominence as more value is derived before ending up with other final products. This paper presents a critical review of the research studies on bio-based VFA production from different waste streams (i.e., industrial sludge/waste, organic fraction of municipal solid waste/food waste, municipal wastewater/sludge, combined streams) through anaerobic fermentation. Fundamentals and decisive process parameters (i.e., pH, temperature, retention time, organic loading rate) are reviewed, and their correlations with VFA yields are critically discussed based on 178 cases (156 lab- and 22 pilot-scale). The picture we provided clearly demonstrates that process parameters should be clearly defined and optimized according to the type of waste streams which may have a significant impact on downstream processes in most cases.

ACS Style

Cecilia Bruni; Alessia Foglia; Anna Laura Eusebi; Nicola Frison; Çağrı Akyol; Francesco Fatone. Targeted Bio-Based Volatile Fatty Acid Production from Waste Streams through Anaerobic Fermentation: Link between Process Parameters and Operating Scale. ACS Sustainable Chemistry & Engineering 2021, 1 .

AMA Style

Cecilia Bruni, Alessia Foglia, Anna Laura Eusebi, Nicola Frison, Çağrı Akyol, Francesco Fatone. Targeted Bio-Based Volatile Fatty Acid Production from Waste Streams through Anaerobic Fermentation: Link between Process Parameters and Operating Scale. ACS Sustainable Chemistry & Engineering. 2021; ():1.

Chicago/Turabian Style

Cecilia Bruni; Alessia Foglia; Anna Laura Eusebi; Nicola Frison; Çağrı Akyol; Francesco Fatone. 2021. "Targeted Bio-Based Volatile Fatty Acid Production from Waste Streams through Anaerobic Fermentation: Link between Process Parameters and Operating Scale." ACS Sustainable Chemistry & Engineering , no. : 1.

Journal article
Published: 19 June 2021 in Applied Energy
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Wastewater treatment is one of the major carriers of the water-energy-food-climate (WEFC) nexus, and although the relationship between water and energy is well recognized, there is still a lack of adequate analysis of the cyber-physical framework to address and assess urban and peri-urban WEFC nexus in an integrated approach. In this review paper, we deeply analyze and summarize the modelling tools and data that are currently used to quantify the nexus in wastewater treatment. Currently, comprehensive models and tools are missing that consider the interconnections amongst catchment, sewer network, wastewater treatment plant (WWTP), river and climatic system in a holistic approach and define relevant monitoring requirements and trustable information provision. Cyber-physical systems provide a technological ground for an efficient management of such integrated systems. The nexus approach in precision irrigation and smart agriculture is further discussed in the paper, highlighting the issue of water reuse and the engagement of different levels of stakeholders. Digital solutions and serious games addressing the nexus in urban and peri-urban water management are also presented to facilitate innovative practice aspects and to foster public involvement. Adaptable digital solutions can help to understand stakeholders’ perception of water quality and its governance and to improve levels of awareness and collaboration between utilities, authorities, farmers and citizens. Finally, recommendations on the added value of currently used models, tools and possible digital solutions are given to WWTP and reclamation managers and/or operators to bring the WEFC nexus approach on the operative environment.

ACS Style

Serena Radini; Enrico Marinelli; Çağrı Akyol; Anna Laura Eusebi; Vasileia Vasilaki; Adriano Mancini; Emanuele Frontoni; Gian Battista Bischetti; Claudio Gandolfi; Evina Katsou; Francesco Fatone. Urban water-energy-food-climate nexus in integrated wastewater and reuse systems: Cyber-physical framework and innovations. Applied Energy 2021, 298, 117268 .

AMA Style

Serena Radini, Enrico Marinelli, Çağrı Akyol, Anna Laura Eusebi, Vasileia Vasilaki, Adriano Mancini, Emanuele Frontoni, Gian Battista Bischetti, Claudio Gandolfi, Evina Katsou, Francesco Fatone. Urban water-energy-food-climate nexus in integrated wastewater and reuse systems: Cyber-physical framework and innovations. Applied Energy. 2021; 298 ():117268.

Chicago/Turabian Style

Serena Radini; Enrico Marinelli; Çağrı Akyol; Anna Laura Eusebi; Vasileia Vasilaki; Adriano Mancini; Emanuele Frontoni; Gian Battista Bischetti; Claudio Gandolfi; Evina Katsou; Francesco Fatone. 2021. "Urban water-energy-food-climate nexus in integrated wastewater and reuse systems: Cyber-physical framework and innovations." Applied Energy 298, no. : 117268.

Journal article
Published: 06 June 2021 in Environmental Pollution
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The water intake of a drinking water treatment plant (DWTP) in Central Italy was monitored over six bloom seasons for cyanotoxin severity, which supplies drinking water from an oligo-mesotrophic lake with microcystin levels up to 10.3 μg/L. The historical data showed that the water temperature did not show extreme/large seasonal variation and it was not correlated either with cyanobacterial growth or microcystin concentration. Among all parameters, the cyanobacteria growth was negatively correlated with humidity and manganese and positively correlated with atmospheric temperature. No significant correlation was found between microcystin concentration and the climatic parameters. Polymer(chitosan)-enhanced microfiltration (PEMF) and ultrafiltration (PEUF) were further tested as an alternative microcystin removal approach from dense cyanobacteria-rich flows. The dominant cyanobacteria in the water intake, Planktothrix rubescens, was isolated and enriched to simulate cyanobacterial blooms in the lake. The PEMF and PEUF were separately applied to enriched P. rubescens culture (PC) (microcystin = 1.236 μg/L) as well as to the sand filter backwash water (SFBW) of the DWTP where microcystin concentration was higher than 12 μg/L. The overall microcystin removal rates from the final effluent of PC (always 99%. The presented results are the first from the application of chitosan to remove P. rubescens as well as the implementation of PEMF and PEUF on SFBW to remove cyanobacterial cells and associated toxins.

ACS Style

Çağrı Akyol; E. Gozde Ozbayram; Stefano Accoroni; Serena Radini; Anna Laura Eusebi; Stefania Gorbi; Carla Vignaroli; Simone Bacchiocchi; Debora Campacci; Fabiola Gigli; Giuseppe Farina; Meric Albay; Francesco Fatone. Monitoring of cyanobacterial blooms and assessing polymer-enhanced microfiltration and ultrafiltration for microcystin removal in an Italian drinking water treatment plant. Environmental Pollution 2021, 286, 117535 .

AMA Style

Çağrı Akyol, E. Gozde Ozbayram, Stefano Accoroni, Serena Radini, Anna Laura Eusebi, Stefania Gorbi, Carla Vignaroli, Simone Bacchiocchi, Debora Campacci, Fabiola Gigli, Giuseppe Farina, Meric Albay, Francesco Fatone. Monitoring of cyanobacterial blooms and assessing polymer-enhanced microfiltration and ultrafiltration for microcystin removal in an Italian drinking water treatment plant. Environmental Pollution. 2021; 286 ():117535.

Chicago/Turabian Style

Çağrı Akyol; E. Gozde Ozbayram; Stefano Accoroni; Serena Radini; Anna Laura Eusebi; Stefania Gorbi; Carla Vignaroli; Simone Bacchiocchi; Debora Campacci; Fabiola Gigli; Giuseppe Farina; Meric Albay; Francesco Fatone. 2021. "Monitoring of cyanobacterial blooms and assessing polymer-enhanced microfiltration and ultrafiltration for microcystin removal in an Italian drinking water treatment plant." Environmental Pollution 286, no. : 117535.

Original article
Published: 05 June 2021 in Biomass Conversion and Biorefinery
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This study sets a specific focus to explore the effectiveness of encapsulation of white-rot fungi as a novel biological pretreatment strategy on biogas production in anaerobic digesters. For this purpose, Trametes versicolor culture was entrapped in Ca-alginate beads and used in a fungal pretreatment step prior to co-digestion of cow manure, food waste, and waste-activated sludge. The results revealed that pretreatment with encapsulated T. versicolor led to an enhancement of biomethane production in all digesters and contributed to an increase in methane yield up to 35%. The maximum methane yield was observed in the digesters co-treating food waste and waste-activated sludge, recorded as 519 mL CH4/g TVSused. On the other hand, much lower methane yield (ranged 161–174 mL CH4/g TVSused) was observed in the digesters operated without food waste and the pretreatment did not reveal any considerable enhancement in methane production in these digesters.

ACS Style

Omer Uzun; Orhan Ince; E. Gozde Ozbayram; Çağrı Akyol; Bahar Ince. New approach to encapsulation of Trametes versicolor in calcium alginate beads: a promising biological pretreatment method for enhanced anaerobic digestion. Biomass Conversion and Biorefinery 2021, 1 -9.

AMA Style

Omer Uzun, Orhan Ince, E. Gozde Ozbayram, Çağrı Akyol, Bahar Ince. New approach to encapsulation of Trametes versicolor in calcium alginate beads: a promising biological pretreatment method for enhanced anaerobic digestion. Biomass Conversion and Biorefinery. 2021; ():1-9.

Chicago/Turabian Style

Omer Uzun; Orhan Ince; E. Gozde Ozbayram; Çağrı Akyol; Bahar Ince. 2021. "New approach to encapsulation of Trametes versicolor in calcium alginate beads: a promising biological pretreatment method for enhanced anaerobic digestion." Biomass Conversion and Biorefinery , no. : 1-9.

Journal article
Published: 01 February 2021 in Journal of Cleaner Production
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Reuse of treated wastewater for irrigation purposes is a measure to reduce water stress and overexploitation of freshwater resources. This study aims to investigate the environmental and economic impacts of a current conventional wastewater treatment plant (WWTP) in Peschiera Borromeo (Milan, Italy), and compare possible scenarios to enable reclaimed water reuse for agriculture. Accordingly, we propose alternative disinfection methods (i.e. enhanced UV, peracetic acid) and replace conventional activated sludge (CAS) with upflow anaerobic sludge blanket (UASB) for biological treatment and use anaerobic membrane bioreactor (AnMBR) as the tertiary treatment. Life cycle assessment (LCA) and life cycle costing (LCC) were implemented on the existing full-scale wastewater treatment line and the hypothetical scenarios. In most cases, the impact categories are primarily influenced by fertilizer application and direct emissions to water (i.e. nutrients and heavy metals). The baseline scenario appears to have the largest environmental impact, except for freshwater eutrophication, human ecotoxicity and terrestrial ecotoxicity. As expected, water depletion is the most apparent impact category between the baseline and proposed scenarios. The UASB + AnMBR scenario gives relatively higher environmental benefits than the other proposed scenarios in climate change (−28%), fossil fuel depletion (−31%), mineral resource depletion (−52%), and terrestrial ecotoxicity compared to the baseline. On the other hand, the highest impact on freshwater eutrophication is also obtained by this scenario since the effluent from the anaerobic processes is rich in nutrients. Moreover, investment and operational costs vary remarkably between the scenarios, and the highest overall costs are obtained for the UASB + AnMBR line mostly due to the replacement of membrane modules (24% of the total cost). The results highlighted the importance of the life cycle approach to support decision making when considering possible upgrading scenarios in WWTPs for water reuse.

ACS Style

Alessia Foglia; Corinne Andreola; Giulia Cipolletta; Serena Radini; Çağrı Akyol; Anna Laura Eusebi; Peyo Stanchev; Evina Katsou; Francesco Fatone. Comparative life cycle environmental and economic assessment of anaerobic membrane bioreactor and disinfection for reclaimed water reuse in agricultural irrigation: A case study in Italy. Journal of Cleaner Production 2021, 293, 126201 .

AMA Style

Alessia Foglia, Corinne Andreola, Giulia Cipolletta, Serena Radini, Çağrı Akyol, Anna Laura Eusebi, Peyo Stanchev, Evina Katsou, Francesco Fatone. Comparative life cycle environmental and economic assessment of anaerobic membrane bioreactor and disinfection for reclaimed water reuse in agricultural irrigation: A case study in Italy. Journal of Cleaner Production. 2021; 293 ():126201.

Chicago/Turabian Style

Alessia Foglia; Corinne Andreola; Giulia Cipolletta; Serena Radini; Çağrı Akyol; Anna Laura Eusebi; Peyo Stanchev; Evina Katsou; Francesco Fatone. 2021. "Comparative life cycle environmental and economic assessment of anaerobic membrane bioreactor and disinfection for reclaimed water reuse in agricultural irrigation: A case study in Italy." Journal of Cleaner Production 293, no. : 126201.

Review article
Published: 09 January 2021 in Journal of Environmental Chemical Engineering
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Contaminants of emerging concern (CECs) are one of the main barriers in the water cycle as they limit the water reuse due to their adverse effects on humans and the ecosystem. Natural and/or engineered ecosystems, such as conventional wastewater treatment processes, are not designed to remove CECs and contribute to the bioaccumulation in organisms considering high volumes of treated water discharges. The adoption of innovative solutions to upgrade urban water cycle facilities has gained relevance for the removal of these substances from final effluents. Molecularly imprinted polymers (MIPs) show promising selective removal toward a wide range of CECs. However, this process is still limited to lab/bench scale and needs to be critically analyzed and assessed for possible scale-up in real environment. Therefore, in this review, an overview of the fate and occurrence of CECs in wastewater is initially reported together with the state-of-the-art adsorption mechanisms to remove these compounds. In the central part of the paper, an evaluation of MIPs synthesis and their status in removing CECs from water matrix are presented. An upscaling pathway of MIPs column from lab- to pilot-scale is given to be applied for enhanced CECs removal and safe water reuse in irrigation/fertigation. Finally, possible integration of MIP columns to real wastewater treatment facilities is discussed and advantages and disadvantages of the potential solutions are addressed to enhance their sustainability.

ACS Style

Marco Parlapiano; Çağrı Akyol; Alessia Foglia; Michela Pisani; Paola Astolfi; Anna Laura Eusebi; Francesco Fatone. Selective removal of contaminants of emerging concern (CECs) from urban water cycle via Molecularly Imprinted Polymers (MIPs): Potential of upscaling and enabling reclaimed water reuse. Journal of Environmental Chemical Engineering 2021, 9, 105051 .

AMA Style

Marco Parlapiano, Çağrı Akyol, Alessia Foglia, Michela Pisani, Paola Astolfi, Anna Laura Eusebi, Francesco Fatone. Selective removal of contaminants of emerging concern (CECs) from urban water cycle via Molecularly Imprinted Polymers (MIPs): Potential of upscaling and enabling reclaimed water reuse. Journal of Environmental Chemical Engineering. 2021; 9 (1):105051.

Chicago/Turabian Style

Marco Parlapiano; Çağrı Akyol; Alessia Foglia; Michela Pisani; Paola Astolfi; Anna Laura Eusebi; Francesco Fatone. 2021. "Selective removal of contaminants of emerging concern (CECs) from urban water cycle via Molecularly Imprinted Polymers (MIPs): Potential of upscaling and enabling reclaimed water reuse." Journal of Environmental Chemical Engineering 9, no. 1: 105051.

Journal article
Published: 22 December 2020 in Journal of Cleaner Production
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Water supply and reuse through non-conventional water resources can significantly decrease the stress on natural water resources. Decentralized systems can help not only to alleviate issues of water security in arid areas, but also to create a sustainable framework within a circular economy. Although these small-scale innovative technologies are able to achieve ready-to-use, high quality of recovered/treated water on-site, the loop cannot be closed in most cases due to legislative barriers. Similarly, the end-use of sewage sludge after treatment in decentralized systems still lacks specific regulations that limit its valorization. This work analyzes the current policy and legislations related to water supply, wastewater treatment, water reuse and resource valorization within the context of decentralized state-of-the-art technologies applied in rural areas. The drawbacks in the current EU legislation that set barriers to close water-related loops in European countries are highlighted. A regulatory fitness check was applied to each type of loop to identify the key factors to accomplish the legislative compliance, and financing pathways were further evaluated at the EU level. As a possible solution, further development of an innovation deal approach is recommended to address the environmental, regulatory and financial gaps in water management through an integrated framework, providing ad-hoc policies and prescriptions for sustainable reuse of all water resources.

ACS Style

Giulia Cipolletta; Emine Gozde Ozbayram; Anna Laura Eusebi; Çağrı Akyol; Simos Malamis; Eric Mino; Francesco Fatone. Policy and legislative barriers to close water-related loops in innovative small water and wastewater systems in Europe: A critical analysis. Journal of Cleaner Production 2020, 288, 125604 .

AMA Style

Giulia Cipolletta, Emine Gozde Ozbayram, Anna Laura Eusebi, Çağrı Akyol, Simos Malamis, Eric Mino, Francesco Fatone. Policy and legislative barriers to close water-related loops in innovative small water and wastewater systems in Europe: A critical analysis. Journal of Cleaner Production. 2020; 288 ():125604.

Chicago/Turabian Style

Giulia Cipolletta; Emine Gozde Ozbayram; Anna Laura Eusebi; Çağrı Akyol; Simos Malamis; Eric Mino; Francesco Fatone. 2020. "Policy and legislative barriers to close water-related loops in innovative small water and wastewater systems in Europe: A critical analysis." Journal of Cleaner Production 288, no. : 125604.

Journal article
Published: 22 October 2020 in Environmental Research
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The first phase of this study aimed to evaluate the environmental impact of combined sewer overflow (CSO) events originated from 35 spillways on the Rio Vallescura catchment (Central Italy) and to understand their contribution to the deterioration of the coastal bathing water quality. A specific analytical campaign was carried out in the sewer system and a dynamic rainfall-runoff simulation model was developed and integrated with a water quality model and further validated. The simulations led to identify the most critical spills in terms of flow rate and selected pollutant loads (i.e. suspended solids, biochemical oxygen demand, chemical oxygen demand, total Kjeldahl nitrogen, Escherichia coli). Specifically, the E. coli release in the water body due to CSO events represented almost 100% of the different pollutant sources considered. In the second phase, the applicability of various disinfection methods was investigated on the CSOs introduced into the catchment. On site physical (UV) and lab-scale chemical (peracetic acid (PAA), performic acid (PFA), ozone) disinfectant agents were tested on microbial indicators including E. coli and intestinal enterococci. PFA and ozone were more effective on the removal of both bacteria (above 3.5 log units) even at low concentration and with short contact time; whereas, PAA showed a moderate removal efficiency (around 2.5 log units) only for E. coli. The highest removal efficiency was achieved in the on-site UV unit and none of the indicator bacteria was detected in the final effluent after the sand filtration and UV treatment. Finally, potential scenarios were developed in comparison to the baseline scenario for the management and treatment of CSOs where a mitigation of E. coli loads from 28% to 73% was achieved on the receiving water body, and a comparative cost assessment of the disinfection methods was provided for in situ treatment of the most critical spillway.

ACS Style

Paolo Crocetti; Anna Laura Eusebi; Cecilia Bruni; Enrico Marinelli; Giovanna Darvini; Claudio Bernardo Carini; Cristiana Bollettini; Virginia Recanati; Çağrı Akyol; Francesco Fatone. Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination. Environmental Research 2020, 196, 110367 .

AMA Style

Paolo Crocetti, Anna Laura Eusebi, Cecilia Bruni, Enrico Marinelli, Giovanna Darvini, Claudio Bernardo Carini, Cristiana Bollettini, Virginia Recanati, Çağrı Akyol, Francesco Fatone. Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination. Environmental Research. 2020; 196 ():110367.

Chicago/Turabian Style

Paolo Crocetti; Anna Laura Eusebi; Cecilia Bruni; Enrico Marinelli; Giovanna Darvini; Claudio Bernardo Carini; Cristiana Bollettini; Virginia Recanati; Çağrı Akyol; Francesco Fatone. 2020. "Catchment-wide validated assessment of combined sewer overflows (CSOs) in a mediterranean coastal area and possible disinfection methods to mitigate microbial contamination." Environmental Research 196, no. : 110367.

Journal article
Published: 23 September 2020 in Chemosphere
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The occurrence, fate and removal of microplastics (MPs) in a wastewater treatment plant (WWTP) in Central Italy were investigated together with their potential adverse effects on anaerobic processes. In the influent of the WWTP, 3.6 MPs.L-1 were detected that mostly comprised polyester fibers and particles in the shape of films, ranging 0.1-0.5 mm and made of polyethylene and polypropylene (PP). The full-scale conventional activated sludge scheme removed 86% of MPs, with the main reduction in the primary and secondary settling. MPs particles bigger than 1 mm were not detected in the final effluent and some loss of polymers types were observed. In comparison, the pilot-scale upflow granular anaerobic sludge blanket (UASB) + anaerobic membrane bioreactor (AnMBR) configuration achieved 94% MPs removal with the abatement of 87% of fibers and 100% of particles. The results highlighted an accumulation phenomenon of MPs in the sludge and suggested the need to further investigate the effects of MPs on anaerobic processes. Accordingly, PP-MPs at concentrations from 5 PP-MPs.gTS-1 to 50 PP-MPs.gTS-1 were spiked in the pilot-scale UASB reactor that was fed with real municipal wastewater, where up to 58% decrease in methanogenic activity was observed at the exposure of 50 PP-MPs.gTS-1. To the best of our knowledge, the presented results will be the first to report of PP-MPs inhibition on anaerobic processes.

ACS Style

Lucia Pittura; Alessia Foglia; Çağrı Akyol; Giulia Cipolletta; Maura Benedetti; Francesco Regoli; Anna Laura Eusebi; Simona Sabbatini; Linda Y. Tseng; Evina Katsou; Stefania Gorbi; Francesco Fatone. Microplastics in real wastewater treatment schemes: Comparative assessment and relevant inhibition effects on anaerobic processes. Chemosphere 2020, 262, 128415 .

AMA Style

Lucia Pittura, Alessia Foglia, Çağrı Akyol, Giulia Cipolletta, Maura Benedetti, Francesco Regoli, Anna Laura Eusebi, Simona Sabbatini, Linda Y. Tseng, Evina Katsou, Stefania Gorbi, Francesco Fatone. Microplastics in real wastewater treatment schemes: Comparative assessment and relevant inhibition effects on anaerobic processes. Chemosphere. 2020; 262 ():128415.

Chicago/Turabian Style

Lucia Pittura; Alessia Foglia; Çağrı Akyol; Giulia Cipolletta; Maura Benedetti; Francesco Regoli; Anna Laura Eusebi; Simona Sabbatini; Linda Y. Tseng; Evina Katsou; Stefania Gorbi; Francesco Fatone. 2020. "Microplastics in real wastewater treatment schemes: Comparative assessment and relevant inhibition effects on anaerobic processes." Chemosphere 262, no. : 128415.

Research article
Published: 01 May 2020 in Waste Management & Research: The Journal for a Sustainable Circular Economy
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The inoculum to substrate (I:S) ratio is a crucial operating parameter during the start-up period of anaerobic digestion (AD) processes and this ratio shows high differentiation with respect to substrate composition. While spent coffee grounds (SCG) have started to gain attraction in AD as a co-substrate due to their vast production and promising methane potential, there is still not enough information on the operative environment of SCG-based biogas reactors. This study investigated the optimal I:S ratio during anaerobic co-digestion of SCG and cow manure. Biochemical methane potential tests were conducted at mesophilic conditions and the influence of I:S ratio on methane production and digestion stability was evaluated at a wide range of I:S ratios from 0.5:1 to 4:1 (volatile solids (VS) basis). Methane yields increased gradually starting from the I:S ratio of 0.5:1 up to 3:1 and the highest methane yield (225 mlCH4 gVS−1) was achieved at the I:S ratio of 3:1. Comparatively lower methane yields were obtained at the ratios of 3.5:1 and 4:1. Instable AD conditions were established at the lowest I:S ratio examined (0.5:1), which caused volatile fatty acid (VFA) accumulation. The results highlighted that anaerobic co-digestion of SCG and cow manure is a promising approach, while the I:S ratio should be well-maintained due to the high potential risk of rapid and/or excess VFA production of these feedstocks.

ACS Style

Çağrı Akyol. In search of the optimal inoculum to substrate ratio during anaerobic co-digestion of spent coffee grounds and cow manure. Waste Management & Research: The Journal for a Sustainable Circular Economy 2020, 38, 1278 -1283.

AMA Style

Çağrı Akyol. In search of the optimal inoculum to substrate ratio during anaerobic co-digestion of spent coffee grounds and cow manure. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2020; 38 (11):1278-1283.

Chicago/Turabian Style

Çağrı Akyol. 2020. "In search of the optimal inoculum to substrate ratio during anaerobic co-digestion of spent coffee grounds and cow manure." Waste Management & Research: The Journal for a Sustainable Circular Economy 38, no. 11: 1278-1283.

Review
Published: 19 April 2020 in Sustainability
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Italy is among the top biowaste-generating countries in Europe, and has a well-structured waste management framework with quite a number of centralized composting facilities. In recent years, there has also been huge interest from local communities in decentralized composting. Although decentralized community composting is common in some countries, there is still a lack of information on the operative environment together with its potential logistical, environmental, economic, and social impacts. Considering the national Italian legislation on community composting as well as successfully implemented projects at EU level, Italy can set a model especially for Mediterranean countries that intend to build decentralized composting programs. Therefore, in the context of this review paper, a brief overview of the composting process was presented together with main applications in centralized and especially in decentralized composting, while the main focus was kept on the operative and legislative information gathered from Italian community composting. There is a huge difference in the number of composting plants between the regions, and the lack of centralized facilities in the central and southern regions can be supported by decentralized solutions. Decentralizing waste treatment facilities and thus creating local solutions to urban waste management strategies will help to achieve the resource recovery and valorization targets in line with the circular economy.

ACS Style

Cecilia Bruni; Çağrı Akyol; Giulia Cipolletta; Anna Laura Eusebi; Donatella Caniani; Salvatore Masi; Joan Colón; Francesco Fatone. Decentralized Community Composting: Past, Present and Future Aspects of Italy. Sustainability 2020, 12, 3319 .

AMA Style

Cecilia Bruni, Çağrı Akyol, Giulia Cipolletta, Anna Laura Eusebi, Donatella Caniani, Salvatore Masi, Joan Colón, Francesco Fatone. Decentralized Community Composting: Past, Present and Future Aspects of Italy. Sustainability. 2020; 12 (8):3319.

Chicago/Turabian Style

Cecilia Bruni; Çağrı Akyol; Giulia Cipolletta; Anna Laura Eusebi; Donatella Caniani; Salvatore Masi; Joan Colón; Francesco Fatone. 2020. "Decentralized Community Composting: Past, Present and Future Aspects of Italy." Sustainability 12, no. 8: 3319.

Journal article
Published: 04 November 2019 in Separation and Purification Technology
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Long term operation of an anaerobic membrane bioreactor (AnMBR) treating municipal wastewater was investigated in a real seawater intrusion spot in Falconara Marittima (Central Italy) on the Adriatic coastline. Changes in biological conversion and system stability were determined with respect to varying organic loading rate (OLR) and high salinity conditions. At an OLR of 1 kg COD m3−1 d−1, biogas production was around 0.39 ± 0.2 L d−1. The increase of the OLR to 2 kg COD m3−1 d−1 resulted in increase of biogas production to 2.8 ± 1.5 L d−1 (with 33.6% ± 10.5% of CH4) with methanol addition and to 4.11 ± 3.1 L d−1 (with 29.7% ± 11.8% of CH4) with fermented cellulosic sludge addition. COD removal by the AnMBR was 83% ± 1% when the effluent COD concentration was below 100 mg O2 L−1. The addition of the fermented sludge affected the membrane operation and significant fouling occurred after long-term filtration, where the trans-membrane pressure (TMP) reached up to 500 mbar. Citric acid solution was applied to remove scalants and the TMP reached the initial value. High saline conditions of 1500 mgCl− L−1 adversely affected the biogas production without deteriorating the membrane operation. The treated effluent met the EU quality standards of the D.M. 185/2003 and the new European Commission Resolution for reuse in agriculture.

ACS Style

Alessia Foglia; Çağrı Akyol; Nicola Frison; Evina Katsou; Anna Laura Eusebi; Francesco Fatone. Long-term operation of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating high salinity low loaded municipal wastewater in real environment. Separation and Purification Technology 2019, 236, 116279 .

AMA Style

Alessia Foglia, Çağrı Akyol, Nicola Frison, Evina Katsou, Anna Laura Eusebi, Francesco Fatone. Long-term operation of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating high salinity low loaded municipal wastewater in real environment. Separation and Purification Technology. 2019; 236 ():116279.

Chicago/Turabian Style

Alessia Foglia; Çağrı Akyol; Nicola Frison; Evina Katsou; Anna Laura Eusebi; Francesco Fatone. 2019. "Long-term operation of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating high salinity low loaded municipal wastewater in real environment." Separation and Purification Technology 236, no. : 116279.

Journal article
Published: 01 November 2019 in Industrial Crops and Products
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ACS Style

Çağrı Akyol; Orhan Ince; Mahir Bozan; Gozde Ozbayram; Bahar Ince. Biological pretreatment with Trametes versicolor to enhance methane production from lignocellulosic biomass: A metagenomic approach. Industrial Crops and Products 2019, 140, 1 .

AMA Style

Çağrı Akyol, Orhan Ince, Mahir Bozan, Gozde Ozbayram, Bahar Ince. Biological pretreatment with Trametes versicolor to enhance methane production from lignocellulosic biomass: A metagenomic approach. Industrial Crops and Products. 2019; 140 ():1.

Chicago/Turabian Style

Çağrı Akyol; Orhan Ince; Mahir Bozan; Gozde Ozbayram; Bahar Ince. 2019. "Biological pretreatment with Trametes versicolor to enhance methane production from lignocellulosic biomass: A metagenomic approach." Industrial Crops and Products 140, no. : 1.

Journal article
Published: 20 September 2019 in Waste Management
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The recovery of cellulose in toilet paper from municipal wastewater is one of the most innovative actions in the circular economy context. In fact, fibres could address possible new uses in the building sector as reinforcing components in binder-based materials. In this paper, rotating belt filters were tested to enhance the recovery of sludge rich in cellulose fibres for possible valorisation in construction applications. Recovered cellulosic material reached value up to 26.6 gm−3 with maximum solids removal of 74%. Content of cellulose, hemicellulose and lignin was found averagely equal to 87% of the total composition. Predictive equation of cellulosic material was further obtained. The addition of recovered cellulose fibres in mortars bring benefits in terms of lightness, microstructure and moisture buffering value (0.17 g/m2%UR). Concerning mechanical properties, flexural strength was improved with the addition of 20% of recovered cellulose fibres. In addition, a simplified economic assessment was reported for two possible pre-mixed blends with 5% and 20% of recovered fibres content.

ACS Style

Silvia Palmieri; Giulia Cipolletta; Carlo Pastore; Chiara Giosuè; Çağrı Akyol; Anna Laura Eusebi; Nicola Frison; Francesca Tittarelli; Francesco Fatone. Pilot scale cellulose recovery from sewage sludge and reuse in building and construction material. Waste Management 2019, 100, 208 -218.

AMA Style

Silvia Palmieri, Giulia Cipolletta, Carlo Pastore, Chiara Giosuè, Çağrı Akyol, Anna Laura Eusebi, Nicola Frison, Francesca Tittarelli, Francesco Fatone. Pilot scale cellulose recovery from sewage sludge and reuse in building and construction material. Waste Management. 2019; 100 ():208-218.

Chicago/Turabian Style

Silvia Palmieri; Giulia Cipolletta; Carlo Pastore; Chiara Giosuè; Çağrı Akyol; Anna Laura Eusebi; Nicola Frison; Francesca Tittarelli; Francesco Fatone. 2019. "Pilot scale cellulose recovery from sewage sludge and reuse in building and construction material." Waste Management 100, no. : 208-218.

Journal article
Published: 01 September 2019 in Bioresource Technology
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In this study, organic matter degradation and microbial diversity were assessed during the composting of lignocellulose-rich digestates. Digestates were collected based on each crop type during anaerobic co-digestion of cow manure and barley, triticale, wheat and rye. Bacterial and fungal diversity in digestate composting systems were determined by 16S and 18S rRNA gene amplicon sequencing, respectively. Crop-based composting of anaerobic digestates showed similar process trends in terms of pH, temperature, moisture content (MC) and C:N ratio. The properties of final compost products were in accordance with the national legislations regarding soil applications, except MC, which were therefore air-dried before being amended to soil. Most abundant bacterial genera were represented by Luteimonas, Bacillus, Ochrobactrum and Thermobifida. Meanwhile, Thermomyces, Aspergillus, Galactomyces and Neurospora were detected as the predominant fungal genera in all compost samples.

ACS Style

Çağrı Akyol; Orhan Ince; Bahar Ince. Crop-based composting of lignocellulosic digestates: Focus on bacterial and fungal diversity. Bioresource Technology 2019, 288, 121549 .

AMA Style

Çağrı Akyol, Orhan Ince, Bahar Ince. Crop-based composting of lignocellulosic digestates: Focus on bacterial and fungal diversity. Bioresource Technology. 2019; 288 ():121549.

Chicago/Turabian Style

Çağrı Akyol; Orhan Ince; Bahar Ince. 2019. "Crop-based composting of lignocellulosic digestates: Focus on bacterial and fungal diversity." Bioresource Technology 288, no. : 121549.

Research article
Published: 26 March 2019 in Environmental Science and Pollution Research
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Nanomaterials (NMs) commercially used for various activities mostly end up in landfills. Reduced biogas productions reported in landfill reactors create a need for more comprehensive research on these greatly-diverse microbial pools. In order to evaluate the impact of one of the most widely-used NMs, namely nano-zinc oxide (nano-ZnO), simulated bioreactor and conventional landfills were operated using real municipal solid waste (MSW) for 300 days with addition nano-ZnO. Leachate samples were taken at different phases and analyzed by 16S rRNA gene amplicon sequencing. The bacterial communities were distinctly characterized by Cloacamonaceae (phylum WWE1), Rhodocyclaceae (phylum Proteobacteria), Porphyromonadaceae (phylum Bacteroidetes), and Synergistaceae (phylum Synergistetes). The bacterial community in the bioreactors shifted at the end of the operation and was dominated by Rhodocyclaceae. There was not a major change in the bacterial community in the conventional reactors. The methanogenic archaeal diversity highly differed between the bioreactors and conventional reactors. The dominance of Methanomicrobiaceae was observed in the bioreactors during the peak methane-production period; however, their prominence shifted to WSA2 in the nano-ZnO-added bioreactor and to Methanocorpusculaceae in the control bioreactor towards the end. Methanocorpusculaceae was the most abundant family in both conventional control and nano-ZnO-containing reactors.

ACS Style

Çağrı Akyol; Gozde Ozbayram; Burak Demirel; Turgut Tüzün Onay; Orhan Ince; Bahar Ince. Linking nano-ZnO contamination to microbial community profiling in sanitary landfill simulations. Environmental Science and Pollution Research 2019, 26, 13580 -13591.

AMA Style

Çağrı Akyol, Gozde Ozbayram, Burak Demirel, Turgut Tüzün Onay, Orhan Ince, Bahar Ince. Linking nano-ZnO contamination to microbial community profiling in sanitary landfill simulations. Environmental Science and Pollution Research. 2019; 26 (13):13580-13591.

Chicago/Turabian Style

Çağrı Akyol; Gozde Ozbayram; Burak Demirel; Turgut Tüzün Onay; Orhan Ince; Bahar Ince. 2019. "Linking nano-ZnO contamination to microbial community profiling in sanitary landfill simulations." Environmental Science and Pollution Research 26, no. 13: 13580-13591.

Journal article
Published: 08 January 2019 in Bioresource Technology
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Energy-efficient biogas reactors are often designed and operated mimicking natural microbial ecosystems such as the digestive tracts of ruminants. Anaerobic fungi play a crucial role in the degradation of lignocellulose-rich fiber thanks to their high cellulolytic activity. Fungal bioaugmentation is therefore at the heart of our understanding of enhancing anaerobic digestion (AD). The efficieny of bioaugmentation with anaerobic fungus Orpinomyces sp. was evaluated in lignocellulose-based AD configurations. Fungal bioaugmentation increased the methane yield by 15-33% during anaerobic co-digestion of cow manure and selected cereal crops/straws. Harvesting stage of the crops was a decisive parameter to influence methane production together with fungal bioaugmentation. A more efficient fermentation process in the bioaugmented digesters was distinguished by relatively-higher abundance of Synergistetes, which was mainly represented by the genus Anaerobaculum. On the contrary, the composition of the methanogenic archaea did not change, and the majority of methanogens was assigned to Methanosarcina.

ACS Style

Çağrı Akyol; Orhan Ince; Mahir Bozan; E. Gozde Ozbayram; Bahar Ince. Fungal bioaugmentation of anaerobic digesters fed with lignocellulosic biomass: What to expect from anaerobic fungus Orpinomyces sp. Bioresource Technology 2019, 277, 1 -10.

AMA Style

Çağrı Akyol, Orhan Ince, Mahir Bozan, E. Gozde Ozbayram, Bahar Ince. Fungal bioaugmentation of anaerobic digesters fed with lignocellulosic biomass: What to expect from anaerobic fungus Orpinomyces sp. Bioresource Technology. 2019; 277 ():1-10.

Chicago/Turabian Style

Çağrı Akyol; Orhan Ince; Mahir Bozan; E. Gozde Ozbayram; Bahar Ince. 2019. "Fungal bioaugmentation of anaerobic digesters fed with lignocellulosic biomass: What to expect from anaerobic fungus Orpinomyces sp." Bioresource Technology 277, no. : 1-10.

Original paper
Published: 03 December 2018 in Waste and Biomass Valorization
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Organic matter degradation and bacterial communities associated to the thermophilic phase of composting were compared using two different types of anaerobic digestates, one from a sewage sludge digester (SD), and the other from an agricultural digester (AD). The composting process exhibited similar variations in temperature, pH, moisture content and bacterial profiles, despite the inherent feedstock differences along with distinctive initial bacterial composition. According to the data obtained from 16S rRNA gene amplicon sequencing, SD constituted more than 20 bacterial phyla with Proteobacteria (21%) and Chloroflexi (21%) being predominant, meanwhile AD was represented by only 7 phyla in which Firmicutes was the most abundant phylum (73%). Nevertheless, bacterial community profiles of the two composting systems became more similarly represented at the phylum level, both dominated by Proteobacteria (65% in AD and 61% in SD), whereas Chromatiaceae and Sphingomonadaceae were the most abundant families in AD and SD, respectively. Highly diverse but similar bacterial communities were detected during the composting of different anaerobic digestates at the thermophilic phase.

ACS Style

Orhan Ince; E. Gozde Ozbayram; Çağrı Akyol; E. Irmak Erdem; Gulsah Gunel; Bahar Ince. Bacterial Succession in the Thermophilic Phase of Composting of Anaerobic Digestates. Waste and Biomass Valorization 2018, 11, 841 -849.

AMA Style

Orhan Ince, E. Gozde Ozbayram, Çağrı Akyol, E. Irmak Erdem, Gulsah Gunel, Bahar Ince. Bacterial Succession in the Thermophilic Phase of Composting of Anaerobic Digestates. Waste and Biomass Valorization. 2018; 11 (3):841-849.

Chicago/Turabian Style

Orhan Ince; E. Gozde Ozbayram; Çağrı Akyol; E. Irmak Erdem; Gulsah Gunel; Bahar Ince. 2018. "Bacterial Succession in the Thermophilic Phase of Composting of Anaerobic Digestates." Waste and Biomass Valorization 11, no. 3: 841-849.

Journal article
Published: 01 February 2018 in Bioresource Technology
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This study aimed to improve biomethane production from lignocellulosic biomass by assessing the impact of bioaugmentation with Clostridium thermocellum on the performance of anaerobic digesters at different inoculation ratios. The outputs of the digestion experiments revealed that bioaugmentation strategies with C. thermocellum increased the methane yield up to 39%. The sequencing analysis indicated that the indigenous microbial community was modified by the bioaugmentation. During the process of bioaugmentation, in the digester that was inoculated at the ratio of 20% (v:v), an increase in the abundance of Ruminococcaceae family led to a decrease in the Bacteroidaceae and Synergistaceae families. Furthermore, the metabolic products of the bioaugmented strains greatly influenced the diversity of the archaeal community and an increase in the abundance of Methanomicrobiales was observed.

ACS Style

Büşra Ecem Öner; Çağrı Akyol; Mahir Bozan; Orhan Ince; Sevcan Aydin; Bahar Ince. Bioaugmentation with Clostridium thermocellum to enhance the anaerobic biodegradation of lignocellulosic agricultural residues. Bioresource Technology 2018, 249, 620 -625.

AMA Style

Büşra Ecem Öner, Çağrı Akyol, Mahir Bozan, Orhan Ince, Sevcan Aydin, Bahar Ince. Bioaugmentation with Clostridium thermocellum to enhance the anaerobic biodegradation of lignocellulosic agricultural residues. Bioresource Technology. 2018; 249 ():620-625.

Chicago/Turabian Style

Büşra Ecem Öner; Çağrı Akyol; Mahir Bozan; Orhan Ince; Sevcan Aydin; Bahar Ince. 2018. "Bioaugmentation with Clostridium thermocellum to enhance the anaerobic biodegradation of lignocellulosic agricultural residues." Bioresource Technology 249, no. : 620-625.

Journal article
Published: 22 January 2018 in Journal of Applied Microbiology
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To investigate the effects of different bioaugmentation strategies for enhancing the biogas production from cow manure and evaluate microbial community patterns.Co-inoculation with cow rumen fluid and cow rumen-derived enriched microbial consortia were evaluated in anaerobic batch tests at 36 °C and 41 °C. Singular addition of both rumen fluid and enriched bioaugmentation culture had a promising enhancement on methane yields; however, the highest methane yield (311 mL CH4 / g VS at 41 °C) was achieved when the anaerobic seed sludge was co-inoculated together with rumen fluid and enriched bioaugmentation culture. Bacterial community profiles were investigated by Ion PGM Platform and specific lignocellulolytic bacteria dynamics in batch tests were assessed by qPCR. The temperature had minor effects on the abundance of bacterial community; in which Bacteroidetes and Firmicutes were the most abundant phyla in all digesters. Furthermore, Rikenellaceae, Clostridiaceae, Porphyromonadaceae, Bacteroidaceae and Ruminococcaceae played a crucial role during the anaerobic degradation of cow manure. There was an important impact of F. flavefaciens and R. albus at the 41 °C, which in turn positively affected the methane production.The degree of enhancement in biogas production can be upgraded by the co-inoculation of rumen-derived bioaugmentation culture with anaerobic seed sludge with high methanogenic activity.A close look at the biotic interactions and their associations with abiotic factors might be valuable for evaluating rumen-related bioaugmentation applications. This article is protected by copyright. All rights reserved.

ACS Style

E.G. Ozbayram; Çağrı Akyol; B. Ince; Canan Karakoç; O. Ince. Rumen bacteria at work: bioaugmentation strategies to enhance biogas production from cow manure. Journal of Applied Microbiology 2018, 124, 491 -502.

AMA Style

E.G. Ozbayram, Çağrı Akyol, B. Ince, Canan Karakoç, O. Ince. Rumen bacteria at work: bioaugmentation strategies to enhance biogas production from cow manure. Journal of Applied Microbiology. 2018; 124 (2):491-502.

Chicago/Turabian Style

E.G. Ozbayram; Çağrı Akyol; B. Ince; Canan Karakoç; O. Ince. 2018. "Rumen bacteria at work: bioaugmentation strategies to enhance biogas production from cow manure." Journal of Applied Microbiology 124, no. 2: 491-502.