Journal
WASTE AND BIOMASS VALORIZATION
Volume 11, Issue 11, Pages 6125-6137Publisher
SPRINGER
DOI: 10.1007/s12649-019-00873-w
Keywords
Anaerobic digestion; Pyrolysis; Energy recovery; Pig slurry; Kinetic analysis
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Funding
- Spanish Ministry of Economy and Competition [CTM2013-48697-C2-1-R, CTQ2015-68925-R]
- Junta de Castilla y Leon (Consejeria de Educacion) fellowship [EDU/1100/2017]
- European Social Fund
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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 non-isothermal 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/m(3) 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% [GRAPHICS] .
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