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The objective of the current work is to study the impact of the operational parameters' variation (HRT, OLR and T) on biomethane productivity in a periodic anaerobic baffled reactor (PABR). The feedstock used was a biomass product named food residue biomass (FORBI), which is dried and shredded source-separated household food waste. The PABR is an innovative, high-rate bioreactor. Apart from the hydraulic retention time (HRT) and the organic loading rate (OLR), an important operational parameter is the switching period (T) of the feeding compartment: when T is high, the bioreactor operation is similar to an anaerobic baffled reactor (ABR), while when it is low, the operation approaches that of an upflow anaerobic sludge blanket reactor (UASBR). Nine distinct experimental phases were conducted, during which the operational parameters of the PABR were consecutively modified: the HRT varied from 9 to 2.5 days, T between 2 days and 1 and finally the OLR from 1.24 gCOD/Lbioreactor*d to 8.08 gCOD/Lbioreactor*d. The maximum biomethane yield was 384 LCH4/kgFORBI corresponding to the operation at HRT = 5 d, OLR = 2.14 gCOD/Lbioreactor*d and T = 2 days. Similar efficiency (333 LCH4/kgFORBI) was achieved at higher OLR (4.53 gCOD/Lbioreactor*d).
D. Mathioudakis; I. Michalopoulos; K. Kalogeropoulos; K. Papadopoulou; G. Lyberatos. Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor. Water Science and Technology 2021, 84, 420 -430.
AMA StyleD. Mathioudakis, I. Michalopoulos, K. Kalogeropoulos, K. Papadopoulou, G. Lyberatos. Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor. Water Science and Technology. 2021; 84 (2):420-430.
Chicago/Turabian StyleD. Mathioudakis; I. Michalopoulos; K. Kalogeropoulos; K. Papadopoulou; G. Lyberatos. 2021. "Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor." Water Science and Technology 84, no. 2: 420-430.
The disposal of voluminous, highly alkaline, bauxite residue (BR), the industrial by-product of alumina production by the Bayer process, constitutes an intricate global environmental problem. BR, containing valuable metals such as rare-earth elements (REEs)—in particular, scandium (Sc)—can be used as a secondary source for REE extraction. The scope of this study was the investigation of bioleaching as an innovative and environmentally friendly approach for the extraction of Sc from BR. The bioleaching parameters were studied on Greek BR and experiments were performed using different microbial cultures and solid to liquid ratios (S/L). The maximum extraction of Sc was 42% using Acetobacter tropicalis in a one-step bioleaching process at 1% S/L. The main organic acids produced were acetic, oxalic, and citric. The bioleaching data indicated a probable synergistic effect of the different organic acids produced by microorganisms along with a more targeted leaching mechanism.
Kyriaki Kiskira; Theopisti Lymperopoulou; Lamprini-Areti Tsakanika; Charalampos Pavlopoulos; Konstantina Papadopoulou; Klaus-Michael Ochsenkühn; Gerasimos Lyberatos; Maria Ochsenkühn-Petropoulou. Study of Microbial Cultures for the Bioleaching of Scandium from Alumina Industry By-Products. Metals 2021, 11, 951 .
AMA StyleKyriaki Kiskira, Theopisti Lymperopoulou, Lamprini-Areti Tsakanika, Charalampos Pavlopoulos, Konstantina Papadopoulou, Klaus-Michael Ochsenkühn, Gerasimos Lyberatos, Maria Ochsenkühn-Petropoulou. Study of Microbial Cultures for the Bioleaching of Scandium from Alumina Industry By-Products. Metals. 2021; 11 (6):951.
Chicago/Turabian StyleKyriaki Kiskira; Theopisti Lymperopoulou; Lamprini-Areti Tsakanika; Charalampos Pavlopoulos; Konstantina Papadopoulou; Klaus-Michael Ochsenkühn; Gerasimos Lyberatos; Maria Ochsenkühn-Petropoulou. 2021. "Study of Microbial Cultures for the Bioleaching of Scandium from Alumina Industry By-Products." Metals 11, no. 6: 951.
The scope of this paper is to examine the environmental and economic performance of an alternative household fermentable waste (HFW) management paradigm, developed within the framework of the HORIZON 2020 project Waste4think. In Greece, the business-as-usual scheme for the management of HFW is its disposal in landfills as part of mixed waste. Waste4think developed an alternative approach based on the benefits of source separation. Specifically, source separated HFW is taken to a drying/shredding plant, located in the municipality, for the production of a high-quality biomass product called FORBI. Alternative approaches have been examined for the exploitation of FORBI. In this work, the use of FORBI as an alternative fuel for the cement industry is assessed using life cycle assessment (LCA) and life cycle costing (LCC) tools. The results show that the proposed HFW management framework performs better than the baseline scenario both in economic and environmental terms. However, focus should be given to the optimisation of the drying/shredding process in order to reduce its energy intensity and environmental loadings.
Dimitrios Mathioudakis; Panagiotis Karageorgis; Konstantina Papadopoulou; Gerasimos Lyberatos. LCA and LCC of dried and shredded food waste as an alternative fuel for the cement industry. Waste Management & Research: The Journal for a Sustainable Circular Economy 2021, 1 .
AMA StyleDimitrios Mathioudakis, Panagiotis Karageorgis, Konstantina Papadopoulou, Gerasimos Lyberatos. LCA and LCC of dried and shredded food waste as an alternative fuel for the cement industry. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2021; ():1.
Chicago/Turabian StyleDimitrios Mathioudakis; Panagiotis Karageorgis; Konstantina Papadopoulou; Gerasimos Lyberatos. 2021. "LCA and LCC of dried and shredded food waste as an alternative fuel for the cement industry." Waste Management & Research: The Journal for a Sustainable Circular Economy , no. : 1.
Purpose: The acquisition of reliable data on Municipal Solid Waste (MSW) composition is very important for the development of environmentally sound, sustainable and economically viable integrated waste management systems. However, no standardized universally accepted waste characterization protocol has been developed, as there are various methodologies described in the relevant literature. In this study, a generic and easy-to-apply MSW sampling and sorting protocol is developed and presented. Methods: The MSW composition characterization was used for the development of an innovative waste management strategy in the Municipality of Halandri (Attica region, Greece). The methodology was applied four times, to study the repeatability of the results, as well as the potential impact of seasonality. In each sampling point one collection bin for each waste stream was employed (mixed waste, recyclables, paper/cardboard and food waste in the region where food waste was separately collected at the source) in order to collect all the separate streams and account for the entire MSW production profile. The sampling points were selected in strictly residential areas (no shops, companies nearby). For 7 consecutive days the content of the bins was collected on a daily basis and transported to a sorting facility, where the content was sorted and weighed. Results: The results repeatedly indicated source separation rates of up to 79% and a level of impurities in the recycling waste source separation and collection streams (recyclables and paper/cardboard) not exceeding 20%. Conclusion: The applied methodology proved to generate accurate results, offering a detailed picture of the Municipal Solid Waste management performance.
D. Mathioudakis; K. Papadopoulou; G. M. Lytras; C. Pavlopoulos; S. Niakas; K. Filippou; E. Melanitou; D. F. Lekkas; G. Lyberatos. A Detailed Characterization of Household Municipal Solid Waste. Waste and Biomass Valorization 2020, 12, 2945 -2957.
AMA StyleD. Mathioudakis, K. Papadopoulou, G. M. Lytras, C. Pavlopoulos, S. Niakas, K. Filippou, E. Melanitou, D. F. Lekkas, G. Lyberatos. A Detailed Characterization of Household Municipal Solid Waste. Waste and Biomass Valorization. 2020; 12 (6):2945-2957.
Chicago/Turabian StyleD. Mathioudakis; K. Papadopoulou; G. M. Lytras; C. Pavlopoulos; S. Niakas; K. Filippou; E. Melanitou; D. F. Lekkas; G. Lyberatos. 2020. "A Detailed Characterization of Household Municipal Solid Waste." Waste and Biomass Valorization 12, no. 6: 2945-2957.
The present study focuses on the production of an alternative fuel (AF) for the cement industry from a food residue biomass (FORBI) product, generated from pre-sorted household food waste (HFW). FORBI is generated by drying and shredding the fermentable fraction of HFW collected door-to-door in the Municipality of Halandri, Greece. The key physicochemical properties such as the net calorific value (NCV), and the concentration of heavy metals and chlorine are subsequently determined using well-established international standards (EN and ISO). FORBI is evaluated as a potential AF in terms of technical feasibility and environmental impacts. Based on the characterization, FORBI is classified as a non-dangerous waste according to EWC 20 01 08, European Commission Decision 2014/955. According to EN 15359, it is classified as category 3, 2, and 1 with respect to NCV, Cl, and Hg respectively. The study concludes that FORBI is a suitable candidate as a secondary fuel for the cement industry, given its high calorific value along with its low humidity and ash content. Challenges for practical implementation include the relatively high chlorine content, the inclusion of alkalis in the cement produced, and the reduction of non-thermal NOx emissions.
Kalliopi Papanikola; Konstantina Papadopoulou; Christos Tsiliyannis; Irene Fotinopoulou; Alexandros Katsiampoulas; Elefterios Chalarakis; Martha Georgiopoulou; Vasiliki Rontogianni; Ioannis Michalopoulos; Dimitrios Mathioudakis; George Marios Lytras; Gerasimos Lyberatos. Food residue biomass product as an alternative fuel for the cement industry. Environmental Science and Pollution Research 2019, 26, 35555 -35564.
AMA StyleKalliopi Papanikola, Konstantina Papadopoulou, Christos Tsiliyannis, Irene Fotinopoulou, Alexandros Katsiampoulas, Elefterios Chalarakis, Martha Georgiopoulou, Vasiliki Rontogianni, Ioannis Michalopoulos, Dimitrios Mathioudakis, George Marios Lytras, Gerasimos Lyberatos. Food residue biomass product as an alternative fuel for the cement industry. Environmental Science and Pollution Research. 2019; 26 (35):35555-35564.
Chicago/Turabian StyleKalliopi Papanikola; Konstantina Papadopoulou; Christos Tsiliyannis; Irene Fotinopoulou; Alexandros Katsiampoulas; Elefterios Chalarakis; Martha Georgiopoulou; Vasiliki Rontogianni; Ioannis Michalopoulos; Dimitrios Mathioudakis; George Marios Lytras; Gerasimos Lyberatos. 2019. "Food residue biomass product as an alternative fuel for the cement industry." Environmental Science and Pollution Research 26, no. 35: 35555-35564.
This study concerns the production of hydrogen and methane from a Food Residue Biomass (FORBI) product (Papanikola et al. in 5th international conference on sustainable waste management systems, Athens, 2017), generated from pre-sorted HFW in a CSTR and in a PABR respectively. FORBI is generated by drying and shredding the fermentable fraction of household food waste collected door-to-door in the Municipality of Halandri, Greece. Hydrogen production from FORBI through anaerobic fermentation under acidogenic mesophilic conditions was carried out using a 4 L CSTR, operated at 12 h HRT under an organic loading of 15 g TS L−1. The H2-CSTR was operated for 40 days. During the operation of H2-CSTR the production of biogas reached up to 0.1026 Lbiogas gFORBI−1 and the percentage of hydrogen in the gas up to 48.2%. The conversion of FORBI into methane was carried out through the operation of a 77 L PABR operated under mesophilic methanogenic conditions at various operating parameters (OLR, HRT, T). Two different approaches were adopted for the pre-treatment of the feedstock. For the two first phases of the experimental procedure, a liquid extraction step was carried out before feeding the bioreactor with the separated liquid fraction, while in the subsequent three phases, a whole suspension of FORBI was used as feed. The mean biogas production rate was 0.158 ± 0.02 Lbiogas gFORBI−1 and the mean methane percentage in the biogas was 67.5 ± 2.1%, in the first two phases. The mean biogas production rate was 0.519 ± 0.03 Lbiogas gFORBI−1 and the mean methane percentage in the biogas was 66 ± 2.8%, when a whole suspension of FORBI was fed to the PABR.
I. Michalopoulos; George Lytras; D. Mathioudakis; C. Lytras; A. Goumenos; I. Zacharopoulos; K. Papadopoulou; G. Lyberatos. Hydrogen and Methane Production from Food Residue Biomass Product (FORBI). Waste and Biomass Valorization 2019, 11, 1647 -1655.
AMA StyleI. Michalopoulos, George Lytras, D. Mathioudakis, C. Lytras, A. Goumenos, I. Zacharopoulos, K. Papadopoulou, G. Lyberatos. Hydrogen and Methane Production from Food Residue Biomass Product (FORBI). Waste and Biomass Valorization. 2019; 11 (5):1647-1655.
Chicago/Turabian StyleI. Michalopoulos; George Lytras; D. Mathioudakis; C. Lytras; A. Goumenos; I. Zacharopoulos; K. Papadopoulou; G. Lyberatos. 2019. "Hydrogen and Methane Production from Food Residue Biomass Product (FORBI)." Waste and Biomass Valorization 11, no. 5: 1647-1655.
In this study, the use of a dual-chamber microbial fuel cell for the production of bioelectricity from a food residue biomass (FORBI) product was investigated. Food residue biomass was produced by drying and shredding the pre-sorted fermentable fraction of household food waste collected door-to-door in the Municipality of Halandri, Athens, Greece. Different organic loads of food residue biomass expressed as chemical oxygen demand (COD) were examined (0.7, 0.9, 1.4, 2.8, 6 and 14 g COD L−1, respectively). It was observed that an increase of the initial concentration of the final extract resulted in a corresponding increase in the operating time. The microbial fuel cell potential increased from 33.3 mV to 46 mV as the concentration was increased from 0.7 to 14 g COD L−1. The best performance in terms of maximum power density (29.6 mW m−2) corresponding to a current density of 88 mA m−2 was observed for 6 g COD L−1. Setting the external resistance at its optimal value (Rext = 2 kΩ) as determined by polarisation experiments, Pyield drastically increased to 13.7 and 17.3 Joule (g FORBI)−1 in two consecutive cycles. The results demonstrate that readily biodegradable substrates, such as food residue biomass, can be effectively used for enhanced bioelectricity harvesting in a microbial fuel cell.
D Chatzikonstantinou; A Tremouli; K Papadopoulou; G Kanellos; I Lampropoulos; G Lyberatos. Bioelectricity production from fermentable household waste in a dual-chamber microbial fuel cell. Waste Management & Research: The Journal for a Sustainable Circular Economy 2018, 36, 1037 -1042.
AMA StyleD Chatzikonstantinou, A Tremouli, K Papadopoulou, G Kanellos, I Lampropoulos, G Lyberatos. Bioelectricity production from fermentable household waste in a dual-chamber microbial fuel cell. Waste Management & Research: The Journal for a Sustainable Circular Economy. 2018; 36 (11):1037-1042.
Chicago/Turabian StyleD Chatzikonstantinou; A Tremouli; K Papadopoulou; G Kanellos; I Lampropoulos; G Lyberatos. 2018. "Bioelectricity production from fermentable household waste in a dual-chamber microbial fuel cell." Waste Management & Research: The Journal for a Sustainable Circular Economy 36, no. 11: 1037-1042.
I. Michalopoulos; T. Kamperidis; G. Seintis; G. Pashos; C. Lytras; K. Papadopoulou; A.G. Boudouvis; G. Lyberatos. Experimental and numerical assessment of the hydraulic behavior of a pilot-scale Periodic Anaerobic Baffled Reactor (PABR). Computers & Chemical Engineering 2018, 111, 278 -287.
AMA StyleI. Michalopoulos, T. Kamperidis, G. Seintis, G. Pashos, C. Lytras, K. Papadopoulou, A.G. Boudouvis, G. Lyberatos. Experimental and numerical assessment of the hydraulic behavior of a pilot-scale Periodic Anaerobic Baffled Reactor (PABR). Computers & Chemical Engineering. 2018; 111 ():278-287.
Chicago/Turabian StyleI. Michalopoulos; T. Kamperidis; G. Seintis; G. Pashos; C. Lytras; K. Papadopoulou; A.G. Boudouvis; G. Lyberatos. 2018. "Experimental and numerical assessment of the hydraulic behavior of a pilot-scale Periodic Anaerobic Baffled Reactor (PABR)." Computers & Chemical Engineering 111, no. : 278-287.
The combination of anaerobic digestion and composting is examined as an integrated valorization process of the livestock waste generated in rural areas. Both biogas and high quality compost may be produced by such a combined process. Six different kinds of waste (pig manure, cow manure, cattle manure, poultry manure, sheep manure and whey) were mixed considering the annual waste production of Metsovo region, Greece, in a representative way. The feed was subjected to a solids/liquid separation step. The bioreactor was operated in different phases with different organic loadings of the liquid fraction of the waste. During phase #1, the Periodic Anaerobic Baffled Reactor (PABR) was fed with a hydraulic retention time (HRT) of 10.65 days, (an organic loading rate of 0.83 g-COD Lreactor−1 day−1) and the biogas production rate was 0.2 Lbiogas Lreactor−1 day−1. During phase #2, the organic loading rate was increased to 1.9 g-COD Lreactor−1 day−1. The biogas production rate was 0.41 Lbiogas Lreactor−1 day−1. During phase #3, the organic loading rate was increased to 2.69 g-COD Lreactor−1 day−1 by decreasing the HRT to 6 days, resulting in the kinetic limitation of the process. The biogas production rate increased to 0.68 Lbiogas Lreactor−1 day−1 with an average methane composition of 65%. The experimental results obtained were used as a basis for the development of an ADM1 model (Batstone et al. in Anaerobic digestion model no. 1 (ADM1). IWA Task Group for Mathematical Modelling of Anaerobic Digestion Processes Report no 1, vol 1(1), 2002) that was able to adequately simulate the operation of the bioreactor. The solid fraction of the pretreatment step was mixed with sawdust and fed to a closed-vessel composter. The highest temperature (56.2 °C) was reached in 2 days. The germination index (GI) of the compost produced was 77.8%, meaning that it was free of phytotoxic substances.
I. Michalopoulos; D. Mathioudakis; I. Premetis; S. Michalakidi; K. Papadopoulou; G. Lyberatos. Anaerobic Co-digestion in a Pilot-Scale Periodic Anaerobic Baffled Reactor (PABR) and Composting of Animal By-Products and Whey. Waste and Biomass Valorization 2017, 10, 1469 -1479.
AMA StyleI. Michalopoulos, D. Mathioudakis, I. Premetis, S. Michalakidi, K. Papadopoulou, G. Lyberatos. Anaerobic Co-digestion in a Pilot-Scale Periodic Anaerobic Baffled Reactor (PABR) and Composting of Animal By-Products and Whey. Waste and Biomass Valorization. 2017; 10 (6):1469-1479.
Chicago/Turabian StyleI. Michalopoulos; D. Mathioudakis; I. Premetis; S. Michalakidi; K. Papadopoulou; G. Lyberatos. 2017. "Anaerobic Co-digestion in a Pilot-Scale Periodic Anaerobic Baffled Reactor (PABR) and Composting of Animal By-Products and Whey." Waste and Biomass Valorization 10, no. 6: 1469-1479.
The objective of this work is the evaluation of two alternative ways of valorizing the liquid fraction of a mixture of different kinds of livestock waste and cheese whey, namely (a) biogas production through the anaerobic co-digestion of in a Periodic Anaerobic Baffled Reactor (PABR) and (b) electrical energy generation in a Microbial Fuel Cell (MFC). The different kinds of livestock manure (pig manure, cow manure, poultry manure, sheep manure and cheese whey) were collected from the region of Metsovo, Greece. The mixture was passed through a pretreatment process producing a liquid fraction that was treated (a) in a pilot-scale Periodic Anaerobic Baffled Reactor (PABR) for methane production and (b) in a lab-scale two-chamber Microbial Fuel Cell for electricity production. In the present study, the experimental data obtained from a previous study [1] were used for the evaluation of a simple mathematical model, based on Monod kinetics, for the PABR using Aquasim 2.1 [2]. The simple model was able to satisfactorily describe the behavior of the PABR in terms of soluble COD consumption. In addition, the same liquid waste, filtered (0.70 μm) and diluted at different initial concentrations, was used as feedstock for electricity production, using a two-chamber microbial fuel cell (MFC). The experiments showed that the MFC performance was not limited by the wastewater strength, since the substrate removal efficiency and the maximum power density were not affected by an increase of the initial concentration. The required time showed a linear relationship with the initial concentration of the substrate.
I. Michalopoulos; D. Chatzikonstantinou; D. Mathioudakis; I. Vaiopoulos; A. Tremouli; M. Georgiopoulou; K. Papadopoulou; G. Lyberatos. Valorization of the Liquid Fraction of a Mixture of Livestock Waste and Cheese Whey for Biogas Production Through High-rate Anaerobic Co-digestion and for Electricity Production in a Microbial Fuel Cell (MFC). Waste and Biomass Valorization 2017, 8, 1759 -1769.
AMA StyleI. Michalopoulos, D. Chatzikonstantinou, D. Mathioudakis, I. Vaiopoulos, A. Tremouli, M. Georgiopoulou, K. Papadopoulou, G. Lyberatos. Valorization of the Liquid Fraction of a Mixture of Livestock Waste and Cheese Whey for Biogas Production Through High-rate Anaerobic Co-digestion and for Electricity Production in a Microbial Fuel Cell (MFC). Waste and Biomass Valorization. 2017; 8 (5):1759-1769.
Chicago/Turabian StyleI. Michalopoulos; D. Chatzikonstantinou; D. Mathioudakis; I. Vaiopoulos; A. Tremouli; M. Georgiopoulou; K. Papadopoulou; G. Lyberatos. 2017. "Valorization of the Liquid Fraction of a Mixture of Livestock Waste and Cheese Whey for Biogas Production Through High-rate Anaerobic Co-digestion and for Electricity Production in a Microbial Fuel Cell (MFC)." Waste and Biomass Valorization 8, no. 5: 1759-1769.
Lignocellulosic biomass, mostly by agricultural and forestry sources, mainly consists of cellulose, hemicelluloses, and lignin. White rot fungi are known to be efficient degraders of cellulose due to their ligninolytic enzyme system.
Konstantina Papadopoulou; Vassilis Dimitropoulos; Fotis Rigas. Assessment of Pleurotus ostreatus mediated degradation of agro-residues by using design of experiments methodologies. Environmental Progress & Sustainable Energy 2015, 34, 1705 -1713.
AMA StyleKonstantina Papadopoulou, Vassilis Dimitropoulos, Fotis Rigas. Assessment of Pleurotus ostreatus mediated degradation of agro-residues by using design of experiments methodologies. Environmental Progress & Sustainable Energy. 2015; 34 (6):1705-1713.
Chicago/Turabian StyleKonstantina Papadopoulou; Vassilis Dimitropoulos; Fotis Rigas. 2015. "Assessment of Pleurotus ostreatus mediated degradation of agro-residues by using design of experiments methodologies." Environmental Progress & Sustainable Energy 34, no. 6: 1705-1713.
Konstantina Papadopoulou; Iphigeneia Maria Kalagona; Antonios Philippoussis; Fotis Rigas. Optimization of fungal decolorization of azo and anthraquinone dyes via Box-Behnken design. International Biodeterioration & Biodegradation 2013, 77, 31 -38.
AMA StyleKonstantina Papadopoulou, Iphigeneia Maria Kalagona, Antonios Philippoussis, Fotis Rigas. Optimization of fungal decolorization of azo and anthraquinone dyes via Box-Behnken design. International Biodeterioration & Biodegradation. 2013; 77 ():31-38.
Chicago/Turabian StyleKonstantina Papadopoulou; Iphigeneia Maria Kalagona; Antonios Philippoussis; Fotis Rigas. 2013. "Optimization of fungal decolorization of azo and anthraquinone dyes via Box-Behnken design." International Biodeterioration & Biodegradation 77, no. : 31-38.
Mycelium growth rates, biomass concentration (estimated as glucosamine content) and laccase and endoglucanase secretion were monitored during solid state fermentation (SSF) of wheat straw (WS), reed grass (RG) and bean stalk (BS) residues by Lentinula edodes strains 119, 121, and 122. In a first experiment, these strains were subjected to screening regarding their growth rates and biomass yield, where strain 121 proved to be the fastest colonizer. However, the greater biomass yield at the end of colonization was demonstrated by strain 122 on BS (465.93 mg g−1 d.w.). In a second experiment, growth characters, as well as endoglucanase and laccase production patterns of the selected strains 121 and 122 were monitored at three intervals i.e., at 33, 66, and 100% of substrate colonization. BS furnished the highest endoglucanase production for strain 121, while RG for strain 122. A strain and substrate-dependent behaviour of the enzyme secretion was detected, with strain 122 presenting maximal endoglucanase activity in all substrates at the initial (33%) and final (100%) stages of colonization (0.64–0.90 and 0.79–0.97 U g−1, respectively). However, in strain 121 the peak of endoglucanase production was detected in the early stages of colonization (at 33% on WS and at 66% on RG and BS). Laccase activity showed increased values (maxima on WS, 353.68 and 548.67 U g−1 by strains 121 and 122, respectively) at 66% of colonization. Correlation analysis of growth data demonstrated negative relations between growth rate and biomass yield and between laccase and endoglucanase activities on WS and RG substrates fermented by strain 122. Finally, possible relations of growth parameters with nutritional constituents of the substrates were investigated.
A. Philippoussis; P. Diamantopoulou; Konstantina Papadopoulou; H. Lakhtar; S. Roussos; G. Parissopoulos; S. Papanikolaou. Biomass, laccase and endoglucanase production by Lentinula edodes during solid state fermentation of reed grass, bean stalks and wheat straw residues. World Journal of Microbiology and Biotechnology 2010, 27, 285 -297.
AMA StyleA. Philippoussis, P. Diamantopoulou, Konstantina Papadopoulou, H. Lakhtar, S. Roussos, G. Parissopoulos, S. Papanikolaou. Biomass, laccase and endoglucanase production by Lentinula edodes during solid state fermentation of reed grass, bean stalks and wheat straw residues. World Journal of Microbiology and Biotechnology. 2010; 27 (2):285-297.
Chicago/Turabian StyleA. Philippoussis; P. Diamantopoulou; Konstantina Papadopoulou; H. Lakhtar; S. Roussos; G. Parissopoulos; S. Papanikolaou. 2010. "Biomass, laccase and endoglucanase production by Lentinula edodes during solid state fermentation of reed grass, bean stalks and wheat straw residues." World Journal of Microbiology and Biotechnology 27, no. 2: 285-297.
A commercial strain of the fungus Pleurotus ostreatus was used to mediate the degradation of lindane, by landfarming technology during a 4 weeks statistical experiment. The Multilevel Factorial Design was used with two design factors, namely, straw content X 1 (%) and lindane content X 2 (ppm). The optimization parameters (responses) investigated were: biodegradation rate Y 1 (μg d−1), biomass growth rate Y 2 (mg d−1), biodegradation/biomass Y 3 (μg mg−1), total organic carbon Y 4 (%), total organic nitrogen Y 5 (%) and total organic carbon/total organic nitrogen Y 6. The optima of the adequate models obtained for the period of 2 and 4-weeks were found. An overall kinetic study, conducted in this work with the aid of experimental design, determined the optimum (maximum) specific lindane degradation rate to be 0.16 g kg−1 month−1.
F. Rigas; Konstantina Papadopoulou; A. Philippoussis; J. Chatzipavlidis. Bioremediation of Lindane Contaminated Soil by Pleurotus ostreatus in Non Sterile Conditions Using Multilevel Factorial Design. Water, Air, & Soil Pollution 2008, 197, 121 -129.
AMA StyleF. Rigas, Konstantina Papadopoulou, A. Philippoussis, J. Chatzipavlidis. Bioremediation of Lindane Contaminated Soil by Pleurotus ostreatus in Non Sterile Conditions Using Multilevel Factorial Design. Water, Air, & Soil Pollution. 2008; 197 (1):121-129.
Chicago/Turabian StyleF. Rigas; Konstantina Papadopoulou; A. Philippoussis; J. Chatzipavlidis. 2008. "Bioremediation of Lindane Contaminated Soil by Pleurotus ostreatus in Non Sterile Conditions Using Multilevel Factorial Design." Water, Air, & Soil Pollution 197, no. 1: 121-129.
Mixtures of a sandy soil and wheat straw were doped with the organochlorine insecticide lindane in glass tubes and were inoculated with the polypore fungus, Ganoderma australe. An evaluation of bioremediation process effectiveness was searched and five parameters identified for the solid-state system. Fungi growth is a function of temperature and requires moisture for a proper colonization. These microorganisms need inorganic nutrients such nitrogen and phosphorus to support cell growth and it is also appropriate to know the range of concentration and toxicity of the used insecticide. Thus, an orthogonal central composite design (CCD) of experiments was used to construct second order response surfaces. Five design factors, namely temperature, moisture, straw, lindane content and nitrogen content and seven optimization parameters (responses), namely lag time, propagation velocity, biomass growth rate, biodegradation rate, biodegradation/biomass, biomass/propagation and biomass content were analyzed. The optima of the responses of the adequate models were found to be the following: propagation velocity 4.25 mm/day, biomass growth rate 408 mg/day, biodegradation/biomass 56.9 μg/g, biomass/propagation 250 mg/mm and fungal biomass content in solid mixture 260 mg/cm3. The most important response for bioremediation purposes is biodegradation/biomass which is maximized at the factors levels: temperature 17.3 °C, moisture 58%, straw content 45%, lindane content 13 ppm and nitrogen content 8.2 ppm.
F. Rigas; Konstantina Papadopoulou; V. Dritsa; D. Doulia. Bioremediation of a soil contaminated by lindane utilizing the fungus Ganoderma australe via response surface methodology. Journal of Hazardous Materials 2007, 140, 325 -332.
AMA StyleF. Rigas, Konstantina Papadopoulou, V. Dritsa, D. Doulia. Bioremediation of a soil contaminated by lindane utilizing the fungus Ganoderma australe via response surface methodology. Journal of Hazardous Materials. 2007; 140 (1-2):325-332.
Chicago/Turabian StyleF. Rigas; Konstantina Papadopoulou; V. Dritsa; D. Doulia. 2007. "Bioremediation of a soil contaminated by lindane utilizing the fungus Ganoderma australe via response surface methodology." Journal of Hazardous Materials 140, no. 1-2: 325-332.
We report experiments in which the interface between two immiscible liquids is subjected to tension by dynamic stressing. During the course of these experiments, cavitation is only observed in the stronger of the two liquids (in terms of their tensile strength). The results are explained in terms of the failure of the liquid-liquid interface under tension, and the ability of the vapour layer so created to reflect subsequent compressional waves as tension. The findings reported here support the results of earlier work in this area and their technological implications are briefly discussed.
P R Williams; S W J Brown; K Papadopoulou; P M Williams. Dynamic stressing of a liquid-liquid interface by tension. Journal of Physics D: Applied Physics 1999, 33, 1 -7.
AMA StyleP R Williams, S W J Brown, K Papadopoulou, P M Williams. Dynamic stressing of a liquid-liquid interface by tension. Journal of Physics D: Applied Physics. 1999; 33 (1):1-7.
Chicago/Turabian StyleP R Williams; S W J Brown; K Papadopoulou; P M Williams. 1999. "Dynamic stressing of a liquid-liquid interface by tension." Journal of Physics D: Applied Physics 33, no. 1: 1-7.