Cazaudehore G, Guyoneaud R, Lallement A, Souquet P, Gassie C, Sambusiti C, Grassl B, Jiménez-Lamana J, Cauzzi P, Monlau F
APESA, Pôle Valorisation, 64121 Montardon, France; Universite de Pau et des Pays de l'Adour / E2S UPPA / CNRS, IPREM UMR5254, Institut des Sciences Analytiques et de Physicochimie pour l'Environnement et les Matériaux, Chimie et Microbiologie de l'Environnement, 64000 Pau, France.
Universite de Pau et des Pays de l'Adour / E2S UPPA / CNRS, IPREM UMR5254, Institut des Sciences Analytiques et de Physicochimie pour l'Environnement et les Matériaux, Chimie et Microbiologie de l'Environnement, 64000 Pau, France.
Bioresour Technol. 2023 Feb;369:128313. doi: 10.1016/j.biortech.2022.128313. Epub 2022 Nov 12.
The development of selective biowaste collection in most European countries provides new opportunities for the anaerobic digestion sector. In parallel, extensive development of biodegradable plastics like polylactic-acid (PLA) and polyhydroxybutyrate (PHB), which facilitates the replacement of conventional plastics, has taken place in the past decade. This study investigated anaerobic co-digestion in semi-continuous reactors of biowastes (75 % Volatil Solids) and biodegradable plastics (25 % Volatil Solids, PLA and PHB). PHB was estimated to be fully biodegraded in the reactors. By contrast, PLA accumulated in the reactor, and an average biodegradation of 47.6 ± 17.9 % was estimated during the third hydraulic retention time. Pretreatment of PLA, by thermo-alkaline hydrolysis at 70 °C, with 2.5 w/v of Ca(OH) for 48 h, improved the biodegradation yield of PLA to 77.5 ± 9.3 %. Finally, it was highlighted that PLA or PHB addition to the feed did not further affect the agronomic properties of the digestate.
大多数欧洲国家选择性生物废弃物收集的发展为厌氧消化领域提供了新机遇。与此同时，过去十年中聚乳酸（PLA）和聚羟基丁酸酯（PHB）等可生物降解塑料得到广泛发展，这有助于替代传统塑料。本研究调查了生物废弃物（75%挥发性固体）和可生物降解塑料（25%挥发性固体，PLA和PHB）在半连续反应器中的厌氧共消化情况。据估计，PHB在反应器中完全生物降解。相比之下，PLA在反应器中积累，在第三个水力停留时间内估计平均生物降解率为47.6±17.9%。通过在70°C下用2.5 w/v的Ca(OH)进行48小时的热碱水解对PLA进行预处理，可将PLA的生物降解率提高到77.5±9.3%。最后，强调了向进料中添加PLA或PHB不会进一步影响消化产物的农艺特性。
