RT info:eu-repo/semantics/article
T1 Enhancement of biogas production rate from bioplastics by alkaline pretreatment
A1 García Depraect, Octavio
A1 Lebrero Fernández, Raquel
A1 Martínez Mendoza, Leonardo José
A1 Rodriguez Vega, Sara
A1 Börner, Rosa Aragão
A1 Börner, Tim
A1 Muñoz Torre, Raúl
K1 Renewable and Green Energy
K1 Renewable energy resources
K1 Biotechnology
K1 Organic Recycling
K1 Waste Management
K1 Alkali pretreatment
K1 Biodegradable bioplastics
K1 Reciclaje Orgánico
K1 Gestión de residuos
K1 Pretratamiento alcalino
K1 Bioplásticos biodegradables
K1 3308 Ingeniería y Tecnología del Medio Ambiente
K1 3303 Ingeniería y Tecnología Químicas
AB The effect of alkali-based pretreatment on the methanization of bioplastics was investigated. The tested bioplastics included PHB [poly(3-hydroxybutyrate)], PHBH [poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)], PHBV [poly(3-hydroxybutyrate-co-3-hydroxyvalerate], PLA (polylactic acid), and a PLA/PCL [poly(caprolactone)] 80/20 blend. Prior to methanization tests, the powdered polymers (500–1000 μm) at a concentration of 50 g/L were subjected to alkaline pretreatment using NaOH 1 M for PLA and PLA/PCL, and NaOH 2 M for PHB-based materials. Following 7 days of pretreatment, the amount of solubilized carbon for PLA and its blend accounted for 92–98% of the total initial carbon, while lower carbon recoveries were recorded for most PHB-based materials (80–93%), as revealed by dissolved total organic carbon analysis. The pretreated bioplastics were then tested for biogas production by means of mesophilic biochemical methane potential tests. Compared to unpretreated PHBs, methanization rates of pretreated PHBs were accelerated by a factor of 2.7 to 9.1 with comparable (430 NmL CH4/g material feed) or slightly lower (15% in the case of PHBH) methane yields, despite featuring a 1.4–2.3 times longer lag phases. Both materials, PLA and the PLA/PCL blend, were only extensively digested when pretreated, yielding about 360–380 NmL CH4 per gram of material fed. Unpretreated PLA-based materials showed nearly zero methanization under the timeframe and experimental conditions tested. Overall, the results suggested that alkaline pretreatment can help to enhance the methanization kinetics of bioplastics.
PB Elsevier
SN 0956-053X
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/59097
UL https://uvadoc.uva.es/handle/10324/59097
LA eng
NO Waste Management, 2023, vol. 164, p. 154-161
NO Producción Científica
DS UVaDOC
RD 07-ago-2024