Enhanced biomethanization of waste polylactic acid plastic by mild hydrothermal pretreatment: Taguchi orthogonal optimization and kinetics modeling

Mu, Lan; Zhang, Lei; Ma, Jun; Zhu, Kongyun; Chen, Chuanshuai; Li, Aimin

doi:10.1016/j.wasman.2021.03.044

Cited by 28 publications

(8 citation statements)

References 40 publications

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“…Bio-based plastics show significant biodegradation, both in AD and composting environments, but only beyond the time scales established for the processes [24,119]. On the other hand, near to the maximum theoretical methane yield was achieved by alkaline, thermal, hydrothermal, gamma irradiation, steam, and combined pretreating of the plastics [123][124][125]. The pretreatments, by simplifying the complex structure of the bio-based plastics, increased the reaction rate and shortened the hydrolysis time, which is the rate limiting step in AD [123].…”

Section: End-of-life Management Optionsmentioning

confidence: 99%

Bio-Based Plastics Production, Impact and End of Life: A Literature Review and Content Analysis

et al. 2022

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The accumulation of plastic wastes is one of the most widely spread problems affecting the environment. The reality that plastics can be made from renewable resources and degrade naturally has prompted academics to think outside the box to develop “better for the environment” items. In this paper, a bibliometric analysis of the scholarly publications related to bio-based plastics within the last 20 years is presented. Annual progression, geographic and research area distribution, and keyword co-occurrence were all examined. Six distinct clusters emerged from keyword analysis, which were further categorized into three directions: production to marketing; impact on the environment, economy, and society; and end-of-life (EoL) options. The major focus was on how to counter the weaknesses and challenges of bio-based plastics and take opportunities using the inherent advantages of bio-based plastics. Comprehensive studies regarding the impact of bio-based plastics on the environment, economy and social sustainability are still deficient. Although there are many promising innovations in this area, most of them are at the research stage. The benefits of bio-based plastics and better EoL options can be enjoyed only after increased production.

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Section: End-of-life Management Optionsmentioning

confidence: 99%

Bio-Based Plastics Production, Impact and End of Life: A Literature Review and Content Analysis

et al. 2022

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“…To be suitable for use in anaerobic digestion, materials must undergo relative rapid degradation under specific conditions, with some industrial plants retaining materials for as little as 21 days. 147 While neat PLA has long degradation times, 148 fibers such as hemp have been shown to have high energy yield under anaerobic conditions; 149 composites incorporating natural fibers may therefore prove to have advantages over neat PLA in this context. While all aspects of a plastic's life (from production to disposal) affect its environmental impact, end-of-life disposal is a major contributor to the overall environmental burden.…”

Section: Propertiesmentioning

confidence: 99%

Accelerating the Biodegradation of Poly(lactic acid) through the Inclusion of Plant Fibers: A Review of Recent Advances

Momeni,

Craplewe,

Safder

et al. 2023

ACS Sustainable Chem. Eng.

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As the global demand for plastics continues to grow, plastic waste is accumulating at an alarming rate with negative effects on the natural environment. The industrially compostable biopolymer poly(lactic acid) (PLA) is therefore being adopted for use in many applications, but the degradation of this material is slow under many end-of-life conditions. This Perspective explores the feasibility of accelerating the degradation of PLA through the formation of PLA-plant fiber composites. Topics include: (a) key properties of PLA, plant-based fibers, and biocomposites; (b) mechanisms of both hydrolytic degradation and biodegradation of PLA-fiber composites; (c) end-of-life degradation of PLA and PLA-plant fiber composites in aerobic and anaerobic conditions, relevant to compost, soil and seawater (aerobic), and landfills (anaerobic); and (d) sustainability and environmental impact of PLA and PLA-plant fiber composites, as evaluated using life cycle assessment. Additional degradation modes, including thermal and photodegradation, which are relevant during processing and use, have been omitted for clarity, as have other types of PLA biocomposites. Multiple studies have shown that the addition of some types of plant fibers to PLA (to form PLA biocomposites) accelerates both water transport in the material and hydrolysis, presenting a possible avenue for improving the end-of-life degradation of these materials. To facilitate the continued development of materials with enhanced biodegradability, we identify a need to implement testing protocols that can distinguish between different degradation mechanisms.

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“…PHBV addition: 1% wt. 75 --- 100.0 SEM x [ 159 ] PHO PHO (Bioplastech R, Bioplastech) <2 × 2 cm 55 Method: high solid anaerobic digestion (ISO 15985) 50 6 biogas DSC, SEM [ 126 ] PLA Commercial PLA blend (80% PLA, 20% additives) <2 mm 55 Mesophilic digestate from a full-scale anaerobic digestere treating sewage sludge 146 442.6 94.8 CH 4 [ 146 ] PLA …”

Section: Table A1mentioning

confidence: 99%

Anaerobic Biodegradability of Commercial Bioplastic Products: Systematic Bibliographic Analysis and Critical Assessment of the Latest Advances

et al. 2023

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Bioplastics have entered everyday life as a potential sustainable substitute for commodity plastics. However, still further progress should be made to clarify their degradation behavior under controlled and uncontrolled conditions. The wide array of biopolymers and commercial blends available make predicting the biodegradation degree and kinetics quite a complex issue that requires specific knowledge of the multiple factors affecting the degradation process. This paper summarizes the main scientific literature on anaerobic digestion of biodegradable plastics through a general bibliographic analysis and a more detailed discussion of specific results from relevant experimental studies. The critical analysis of literature data initially included 275 scientific references, which were then screened for duplication/pertinence/relevance. The screened references were analyzed to derive some general features of the research profile, trends, and evolution in the field of anaerobic biodegradation of bioplastics. The second stage of the analysis involved extracting detailed results about bioplastic degradability under anaerobic conditions by screening analytical and performance data on biodegradation performance for different types of bioplastic products and different anaerobic biodegradation conditions, with a particular emphasis on the most recent data. A critical overview of existing biopolymers is presented, along with their properties and degradation mechanisms and the operating parameters influencing/enhancing the degradation process under anaerobic conditions.

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Enhanced biomethanization of waste polylactic acid plastic by mild hydrothermal pretreatment: Taguchi orthogonal optimization and kinetics modeling

Cited by 28 publications

References 40 publications

Bio-Based Plastics Production, Impact and End of Life: A Literature Review and Content Analysis

Bio-Based Plastics Production, Impact and End of Life: A Literature Review and Content Analysis

Accelerating the Biodegradation of Poly(lactic acid) through the Inclusion of Plant Fibers: A Review of Recent Advances

Anaerobic Biodegradability of Commercial Bioplastic Products: Systematic Bibliographic Analysis and Critical Assessment of the Latest Advances

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