Enzyme modified biodegradable plastic preparation and performance in anaerobic co-digestion with food waste
2024; Elsevier BV; Volume: 401; Linguagem: Inglês
10.1016/j.biortech.2024.130739
ISSN1873-2976
AutoresWenjie Liu, Shizhuo Wang, Songting He, Yang Shi, Cheng Hou, Xintong Jiang, Yuanbo Song, Tao Zhang, Yalei Zhang, Zheng Shen,
Tópico(s)Food Waste Reduction and Sustainability
ResumoA modified biodegradable plastic (PLA/PBAT) was developed by through covalent bonding with proteinase K, porcine pancreatic lipase, or amylase, and was then investigated in anaerobic co-digestion mixed with food waste. Fluorescence microscope validated that enzymes could remain stable in modified the plastic, even after co-digestion. The results of thermophilic anaerobic co-digestion showed that, degradation of the plastic modified with Proteinase K increased from 5.21 ± 0.63 % to 29.70 ± 1.86 % within 30 days compare to blank. Additionally, it was observed that the cumulative methane production increased from 240.9 ± 0.5 to 265.4 ± 1.8 mL/gVS, and the methane production cycle was shortened from 24 to 20 days. Interestingly, the kinetic model suggested that the modified the plastic promoted the overall hydrolysis progression of anaerobic co-digestion, possibly as a result of the enhanced activities of Bacteroidota and Thermotogota. In conclusion, under anaerobic co-digestion, the modified the plastic not only achieved effective degradation but also facilitated the co-digestion process.
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