A hybrid chemical-biological approach can upcycle mixed plastic waste with reduced cost and carbon footprint

Dou, Chang; Choudhary, Hemant; Wang, Zilong; Baral, Nawa R.; Mohan, Mood; Aguilar, Rolin A.; Huang, Shenyue; Holiday, Alexander; Banatao, D. Rey; Singh, Seema; Scown, Corinne D.; Keasling, Jay D.; Simmons, Blake A.; Sun, Ning

doi:10.1016/j.oneear.2023.10.015

Title: A hybrid chemical-biological approach can upcycle mixed plastic waste with reduced cost and carbon footprint

Journal Article · 16 November 2023 · One Earth

DOI: https://doi.org/10.1016/j.oneear.2023.10.015 · OSTI ID:2311687

^[1]; Choudhary, Hemant ^[2]; Wang, Zilong ^[3]; Baral, Nawa R. ^[4]; Mohan, Mood ^[2]; Aguilar, Rolin A. ^[5]; Huang, Shenyue ^[5]; Holiday, Alexander ^[6]; Banatao, D. Rey ^[6]; Singh, Seema ^[2]; Scown, Corinne D. ^[7];

^[8]; Simmons, Blake A. ^[4]; Sun, Ning ^[1]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); University of California, Berkeley, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Joint BioEnergy Institute (JBEI), Emeryville, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
X, The Moonshot Factory, Mountain View, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Energy & Biosciences Institute, Berkeley, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); University of California, Berkeley, CA (United States); Shenzhen Institutes of Advanced Technologies, Shenzhen (China); Technical Univ. of Denmark, Kongens Lyngby (Denmark)

Derived from renewable feedstocks, such as biomass, polylactic acid (PLA) is considered a more environmentally friendly plastic than conventional petroleum-based polyethylene terephthalate (PET). However, PLA must still be recycled, and its growing popularity and mixture with PET plastics at the disposal stage poses a cross-contamination threat in existing recycling facilities and results in low-value and low-quality recycled products. Hybrid upcycling has been proposed as a promising sustainable solution for mixed plastic waste, but its techno-economic and life cycle environmental performance remain understudied. We propose a hybrid upcycling approach using a biocompatible ionic liquid (IL) to first chemically depolymerize plastics and then convert the depolymerized stream via biological upgrading with no extra separation. Here we show that over 95% of mixed PET/PLA was depolymerized into the respective monomers, which then served as the sole carbon source for the growth of Pseudomonas putida, enabling the conversion of the depolymerized plastics into biodegradable polyhydroxyalkanoates (PHAs). In comparison to conventional commercial PHAs, the estimated optimal production cost and carbon footprint are reduced by 62% and 29%, respectively.

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Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525; AC02-05CH11231

OSTI ID:: 2311687

Alternate ID(s):: OSTI ID: 2369885

Report Number(s):: SAND--2023-13762J

Journal Information:: One Earth, Journal Name: One Earth Journal Issue: 11 Vol. 6; ISSN 2590-3322

Publisher:: Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
polylactic acid
PLA
polyethylene terephthalate
PET
ionic liquid
IL
cholinium lysinate
depolymerization
waste recycling
Pseudomonas Putida
Polyhydroxyalkanoates
PHA
techno-economic analysis
life-cycle assessment

Title: A hybrid chemical-biological approach can upcycle mixed plastic waste with reduced cost and carbon footprint

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References (76)

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