Department of Civil, Energy, Environmental and Materials Engineering, Università Mediterranea di Reggio Calabria, via Graziella - loc. Feo di Vito, 89122 Reggio Calabria, Italy.
Department Agraria, Università Mediterranea di Reggio Calabria, loc. Feo di Vito, 89122 Reggio Calabria, Italy.
J Hazard Mater. 2020 May 15;390:121653. doi: 10.1016/j.jhazmat.2019.121653. Epub 2019 Nov 11.
Biodegradable plastics have been introduced to the market to substitute "traditional", non-biodegradable, petro-based plastics to alleviate plastic pollution. Biochemical methane potential tests were carried out on compostable bags made of MaterBi®, biodegradable bottle wine corks and cellulosic plates to examine the anaerobic biodegradability of those materials. The impact of four factors: type of pretreatment (predigestion, mechanical, alkaline, predigestion and alkaline), digestion duration, type of inoculum and temperature were statistically evaluated through regression modeling. Anaerobic tests on compostable and polyethylene bags (control) were carried out in mesophilic (35 °C) and thermophilic (55 °C) conditions, while tests on bottle wine corks and cellulosic plates were carried out in mesophilic conditions only. After 15 days of digestion, a dry mass reduction of 22.8 ± 6.2 % and 27.6 ± 14.0 % for mesophilic and thermophilic tests respectively was recorded for MaterBi®. Chemical pretreatment with NaOH led to a mass reduction of 78.2 ± 7.2 % and was the only statistically significant factor to affect both methane yields and dry mass loss. A higher digestion temperature led to an increased mass loss without a concurrent increase in methane production. The cellulosic plates were completely degraded (99.9 ± 0.03 % mass reduction), while the wine bottle corks weight did not change.
可生物降解塑料已被推向市场，以替代“传统”的不可生物降解的石油基塑料，以减轻塑料污染。对由 MaterBi®制成的可堆肥袋、可生物降解的瓶塞和纤维素板进行了生物化学甲烷潜力测试，以检验这些材料的厌氧生物降解性。通过回归建模，对四种因素（预处理类型（预消化、机械、碱性、预消化和碱性）、消化时间、接种物类型和温度）的影响进行了统计评估。可堆肥和聚乙烯袋（对照）的厌氧测试在中温（35°C）和高温（55°C）条件下进行，而瓶塞和纤维素板的测试仅在中温条件下进行。在消化 15 天后，MaterBi®在中温和高温测试中的干物质减少率分别为 22.8±6.2%和 27.6±14.0%。NaOH 的化学预处理导致质量减少 78.2±7.2%，是唯一对甲烷产量和干物质损失有影响的统计上显著因素。较高的消化温度导致质量损失增加，但甲烷产量没有增加。纤维素板完全降解（质量减少 99.9±0.03%），而酒瓶塞的重量没有变化。
