Enhancement of biogas production rate from bioplastics by alkaline pretreatment
| Autor: | Octavio García-Depraect, Raquel Lebrero, Leonardo J. Martínez-Mendoza, Sara Rodriguez-Vega, Rosa Aragão Börner, Tim Börner, Raúl Muñoz |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
History
Reciclaje Orgánico Polymers and Plastics Renewable and Green Energy Organic Recycling 3308 Ingeniería y Tecnología del Medio Ambiente Renewable energy resources Industrial and Manufacturing Engineering Gestión de residuos Alkali pretreatment 3303 Ingeniería y Tecnología Químicas Waste Management Pretratamiento alcalino Biodegradable bioplastics Business and International Management Waste Management and Disposal Biotechnology Bioplásticos biodegradables |
| DOI: | 10.1016/j.wasman.2023.04.009 |
| Popis: | Producción Científica 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. Ministerio de Ciencia e Innovación - AEI and European Union NextGenerationEU/PRTR (RYC2021‐034559‐I) Junta de Castilla y León - EU-FEDER (CLU 2017-09, CL-EI-2021-07 y UIC 315) |
| Databáze: | OpenAIRE |
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