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)₂ 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物收集的发展为厌氧消化行业提供了新的机会。与此同时，在过去十年中，聚乳酸 (PLA) 和聚羟基丁酸酯 (PHB) 等可生物降解塑料的广泛开发促进了传统塑料的替代。本研究调查了生物废物（75% 挥发性固体）和可生物降解塑料（25% 挥发性固体、PLA 和 PHB）的半连续反应器中的厌氧共消化。据估计，PHB 在反应器中可完全生物降解。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 %。_{PLA 预处理，在 70 °C 下用 2.5 w/v Ca(OH) 2}进行热碱水解48 h，将 PLA 的生物降解率提高到 77.5 ± 9.3 %。最后，需要强调的是，在饲料中添加 PLA 或 PHB 不会进一步影响消化物的农学特性。