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This work addresses the joint management of residual microalgae and pine wood waste through pyrolysis to obtain a solid product for its use as soil amendment and two other by-products (liquid and gaseous) that can be used for energy purposes. Two management routes have been followed. The first route is through the co-pyrolysis of mixtures of both residual materials in several proportions and the later use of their solid fraction for soil amendment. The second route is the pyrolysis of pine wood waste and its direct combination with dried residual microalgae, also using it as soil amendment. The solid fraction assessment shows that from seven solid products (biochar) three stand out for their positive applicability in agriculture as soil amendment. In addition, they also present the benefit of serving as carbon sink, giving a negative balance of CO2 emissions. However, caution is suggested due to biochar applicability being subject to soil characteristics. To ensure the sustainability of the overall process, the energy available in liquid and gaseous fractions has been assessed for covering the drying needs of the residual microalgae in both cases. These results suggest that the pyrolysis process is a sustainable way to manage specific evaluated residues and their products.
José Rosas; Natalia Gómez; Jorge Cara-Jiménez; Judith González-Arias; Miguel Olego; Marta Sánchez. Evaluation of Joint Management of Pine Wood Waste and Residual Microalgae for Agricultural Application. Sustainability 2020, 13, 53 .
AMA StyleJosé Rosas, Natalia Gómez, Jorge Cara-Jiménez, Judith González-Arias, Miguel Olego, Marta Sánchez. Evaluation of Joint Management of Pine Wood Waste and Residual Microalgae for Agricultural Application. Sustainability. 2020; 13 (1):53.
Chicago/Turabian StyleJosé Rosas; Natalia Gómez; Jorge Cara-Jiménez; Judith González-Arias; Miguel Olego; Marta Sánchez. 2020. "Evaluation of Joint Management of Pine Wood Waste and Residual Microalgae for Agricultural Application." Sustainability 13, no. 1: 53.
Anaerobic digestion is an established technological option for the treatment of agricultural residues and livestock wastes beneficially producing renewable energy and digestate as biofertilizer. This technology also has significant potential for becoming an essential component of biorefineries for valorizing lignocellulosic biomass due to its great versatility in assimilating a wide spectrum of carbonaceous materials. The integration of anaerobic digestion and pyrolysis of its digestates for enhanced waste treatment was studied. A theoretical analysis was performed for three scenarios based on the thermal needs of the process: The treatment of swine manure (scenario 1), co-digestion with crop wastes (scenario 2), and addition of residual glycerine (scenario 3). The selected plant design basis was to produce biochar and electricity via combined heat and power units. For electricity production, the best performing scenario was scenario 3 (producing three times more electricity than scenario 1), with scenario 2 resulting in the highest production of biochar (double the biochar production and 1.7 times more electricity than scenario 1), but being highly penalized by the great thermal demand associated with digestate dewatering. Sensitivity analysis was performed using a central composite design, predominantly to evaluate the bio-oil yield and its high heating value, as well as digestate dewatering. Results demonstrated the effect of these parameters on electricity production and on the global thermal demand of the plant. The main significant factor was the solid content attained in the dewatering process, which excessively penalized the global process for values lower than 25% TS.
Rubén González; Judith González; José G. Rosas; Richard Smith; Xiomar Gómez. Biochar and Energy Production: Valorizing Swine Manure through Coupling Co-Digestion and Pyrolysis. C 2020, 6, 43 .
AMA StyleRubén González, Judith González, José G. Rosas, Richard Smith, Xiomar Gómez. Biochar and Energy Production: Valorizing Swine Manure through Coupling Co-Digestion and Pyrolysis. C. 2020; 6 (2):43.
Chicago/Turabian StyleRubén González; Judith González; José G. Rosas; Richard Smith; Xiomar Gómez. 2020. "Biochar and Energy Production: Valorizing Swine Manure through Coupling Co-Digestion and Pyrolysis." C 6, no. 2: 43.
Common kinetic parameters were obtained for leached and non-leached samples of vine wood biomass. Both samples were considered to have different proportions of cellulose, hemicellulose, and lignin compositions as a result of the leaching process. The two samples were analyzed in terms of pyrolysis kinetic parameters using non-isothermal thermogravimetric analysis. Furthermore, the classic Friedman isoconversional method, a deconvolution procedure using the Fraser–Suzuki function, and a modified Friedman method from a previous study on the delay in conversion degree were satisfactorily applied. The observed difference when the deconvolution technique was applied suggests that the classic Friedman method is not adequate for studying the pyrolysis of individual vine wood biomass components. However, this issue was solved by studying the delay in conversion degree of both biomasses and calculating the kinetic parameters using the resulting information. This procedure was found to be useful for studying and comparing the kinetics of heterogeneous biomasses and has a sound scientific explanation, making this research a basis for future similar studies.
Sergio Suárez; Jose Guillermo Rosas; Marta Elena Sánchez; Roberto López; Natalia Gómez; Jorge Cara-Jiménez. Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis. Energies 2019, 12, 2599 .
AMA StyleSergio Suárez, Jose Guillermo Rosas, Marta Elena Sánchez, Roberto López, Natalia Gómez, Jorge Cara-Jiménez. Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis. Energies. 2019; 12 (13):2599.
Chicago/Turabian StyleSergio Suárez; Jose Guillermo Rosas; Marta Elena Sánchez; Roberto López; Natalia Gómez; Jorge Cara-Jiménez. 2019. "Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis." Energies 12, no. 13: 2599.
The aim of this work was to study the effect of ultrasonic pretreatment on sludge digestion, particle size distribution (PSD), and dewaterability of digestates (measured by capillary suction time (CST) and specific resistance to filtration (SRF)). Sludge was pretreated with ultrasound (24 kHz) at an energy dosage of 4300 kJ/kg TS. Digestibility of sludge was increased by ultrasound pretreatment resulting in a higher specific methane production (SMP). The digestate of pretreated waste activated sludge (WAS) obtained under batch conditions presented a better dewatering performance. Digestion under semi-continuous conditions was evaluated using sewage sludge (mixture of primary sludge and WAS). In this case, digestates presented a much higher mean particle size for both cases evaluated (pretreated and non-pretreated) than that obtained under batch conditions. A wide PSD was a characteristic of these digestate samples. Flow dynamics inside the reactor resulted in the presence of high-diameter flocs, thus significantly affecting the mean particle size and specific surface area (SSA) values.
Elia Judith Martínez; José Guillermo Rosas; Antonio Morán; Xiomar Gómez. Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis. Water 2015, 7, 6483 -6495.
AMA StyleElia Judith Martínez, José Guillermo Rosas, Antonio Morán, Xiomar Gómez. Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis. Water. 2015; 7 (11):6483-6495.
Chicago/Turabian StyleElia Judith Martínez; José Guillermo Rosas; Antonio Morán; Xiomar Gómez. 2015. "Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis." Water 7, no. 11: 6483-6495.