Integrating Anaerobic Digestion of Pig Slurry and Thermal Valorisation of Biomass
- PDF / 2,378,883 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 69 Downloads / 169 Views
ORIGINAL PAPER
Integrating Anaerobic Digestion of Pig Slurry and Thermal Valorisation of Biomass J. González‑Arias1 · C. Fernández1 · J. G. Rosas2 · M. P. Bernal3 · R. Clemente3 · M. E. Sánchez1 · X. Gómez1 Received: 10 May 2019 / Accepted: 28 October 2019 © Springer Nature B.V. 2019
Abstract Purpose The feasibility of coupling the anaerobic digestion of pig manure and co-pyrolysis of its digestate with milk thistle as lignocellulosic biomass was studied. Kinetic analysis was performed along with an evaluation of energy recovery attained from a combined approach Methods Pig slurry was digested under mesophilic semi-continuous conditions. Digestate was dried and submitted to thermogravimetric analysis under inert atmosphere along with milk thistle samples. Kinetic evaluation was carried out using nonisothermal methods. Assessment of the energy obtained from the combined digestion and pyrolysis process was performed. Results Digestion resulted in a yield of 308.5 ± 18.2 mL CH4/g VS. The evaluation of co-pyrolysis of mixtures at different contents of milk thistle showed no interactions between the two materials during pyrolysis. The energy need associated with thermal drying of digestate was 476 MJ/m3 of pig slurry. Conclusions Co-pyrolysis of lignocellulosic biomass and digestate [25% content of digestate (w/w)] resulted in a lower char production, associated with the lower ash content of the former. The extra supply of energy needed for thermal drying of the digestate might be obtained from co-pyrolysis with biomass. This approach presented an energy recovery of about 29.4% Graphic Abstract
Keywords Anaerobic digestion · Pyrolysis · Energy recovery · Pig slurry · Kinetic analysis
Statement of Novelty Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12649-019-00873-w) contains supplementary material, which is available to authorized users. * X. Gómez [email protected] Extended author information available on the last page of the article
This research work evaluates the valorisation of digestates and considers the pyrolysis of this material as an alternative to disposal for obtaining biochar and biofuels. This assessment considers an experimental digestion of pig slurry under semi-continuous conditions and a kinetic analysis of organic samples for establishing their behaviours under pyrolysis.
13
Vol.:(0123456789)
The novelty of this work is based on the analysis of energy inputs and demands of the different operational units to obtain a feasible valorisation scenario. Pyrolysis aids in reducing the amount of material to be finally disposed of, but as a disadvantage it requires thermal energy for drying the biomass and heating up to reach process temperature. This feature is analysed and a final estimated recovery of energy is attained.
Introduction Anaerobic digestion is usually the preferred option when valorising wastes with a high organic and water content. This type of alternative treatment allows for transforming organic matter under mild condi
Data Loading...
