检索结果-内蒙古大学图书馆

Combined thermochemical-biotechnological approach for the valorization of polyolefins into polyhydroxyalkanoates: Development of an integrated bioconversion process by microbial consortia

引用

Chemosphere 2024年 367卷 143671页

作者： Lomwongsopon, Passanun Narancic, Tanja Wimmer, Reinhard Varrone, Cristiano Section of Bioresources and Process Engineering Department of Chemistry and Bioscience Aalborg University Fredrik Bajers Vej 7H Aalborg9220 Denmark School of Biomolecular and Biomedical Science BiOrbic - Bioeconomy Research Centre University College Dublin Ireland Dublin 4 Belfield Ireland Section of Medical Biotechnology Department of Chemistry and Bioscience Aalborg University Fredrik Bajers Vej 7H Aalborg9220 Denmark

Waste management of persistent polymers such as polyolefins (PO)1 still represents a major challenge, often leading to material loss from the value chain and contributing to plastic pollution. This study investigated an integrated process to valorize PO pyrolysis side stream. PO wax was recovered and used as a feedstock for a microbial bioconversion process. A modified emulsification protocol (using two-surfactants system) allowed the successful dispersion and bioconversion of PO wax without the need of the extra oxidation step. Enrichment of plastic landfill inocula allowed to develop efficient mixed microbial consortia (MMC) able to grow on PO wax. Adaptive laboratory evolution improved 4 times cell growth, leading to 2.6–17.3 times shorter lag phase. The bioconversion process using the adapted MMC was performed in a 2 L-bioreactor with PO wax-emulsified media (10 g L−1) at neutral pH and 20% pO2. 87% of substrate was consumed within 12 h and complete consumption was achieved within 48 h (4 times faster than previously reported). A maximum of 2.95 gCDW L−1of biomass was produced, while the intracellular triglycerides reached a maximum of 105.5 mg L−1 at 30 h. Moreover, the conversion of PO wax into polyhydroxyalkanoates (PHAs) was demonstrated and the production was maximized by statistical optimization. Maximum PHA titer of 384 0.1 mg L−1 was achieved, which represents a 1.5–17 times improvement from previous reports. This integrated thermochemical-biotechnological approach might represent an interesting strategy to valorize and upcycle currently unrecyclable PO-rich mixed plastic waste streams, thus improving the circularity of the plastic sector. © 2024 The Authors

关键词： Microorganisms

来源：评论

学校读者我要写书评

暂无评论

Enhancing biodegradation of polyolefins and real mixed plastic waste by combination of pretreatment and mixed microbial consortia

引用

Chemosphere 2025年 373卷 144151页

作者： Lomwongsopon, Passanun Martínez, Belén Monje Jiménez, Alberto Barranca Bardenstein, Alexander Leo Kusano, Yukihiro de Claville Christiansen, Jesper Varrone, Cristiano Section of Bioresources and Process Engineering Department of Chemistry and Bioscience Aalborg University Fredrik Bajers Vej 7H Aalborg9220 Denmark AIMPLAS Instituto Technológico del Plástico València Parc Tecnològic C/Gustave Eiffel 4 Valencia Paterna46980 Spain Plastics and Packaging Technology Danish Technological Institute Taastrup2630 Denmark Department of Materials and Production Aalborg University Fibigerstræde 16 Aalborg9220 Denmark

Polyolefins (PO)1 are the most common consumer plastics, constituting about half of plastic waste. This work investigated the process combining physicochemical pretreatment and PO-enriched mixed microbial consortia (MMCs) on biodegrading European real mixed plastic waste. The MMCs, acclimatized on PO powders, were enriched with strains that could use PO, primarily dominated by the genus Rhodanobacter. Several pretreatment methods were investigated on pure polyethylene (PE) and polypropylene (PP). UVC combined with Fenton's reagent was found to be the best pretreatment process for pure PO, increasing the total oxidative indices of PE and PP by 135 and 21 times, respectively, and decrease the total crystallinity of PP by 2.3 times (but not PE), compared to the untreated ones. Maximum 7.7% and 16.3% weight reductions were achieved after MMCs biodegradation of UVC-Fenton-treated PE and PP powders (80 μm), with a 4.3- and 27.2-times improvement from the untreated ones. Selected pretreatments and MMCs were then applied to real mixed plastic waste and post-consumer multilayers from 10 different streams. The highest weight reductions after 30-days biodegradation were obtained using mixed plastic reject from a biogas plant (MW2) followed by the unrecyclable mixed plastic waste from a Danish municipality (MW1), with a reduction of 36.8% and 30.0% using radio frequency (RF) oxygen plasma pretreatment, respectively. Integration of ultrasonic irradiation with atmospheric pressure plasma treatment increased the biodegradation of MW1 to 39.4%. This study addressed the bottleneck of slow biodegradation of recalcitrant plastics, laying down the basis for future development of biotechnological recycling of unrecyclable plastic fractions. © 2025 The Author(s)

关键词： Plasma applications

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：