Preliminary Optimization of the Environmental Performance of PHA Downstream Processing

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Preliminary optimization of the environmental performance of PHA downstream processing Mateo Saavedra del Oso, Miguel Mauricio-Iglesias and Almudena Hospido Group of Environmental Biotechnnology Universidade de Santiago de Compostela USABLE PACKAGING Call: H2020-BBI-JTI-2018 EU ID: 836884 Building blocks for a sustainable bioplastic value chain 100 Mt of food waste/year Biobased packaging products Building blocks 2 … but how? Framework: knowledge integration for efficient decision making BIOPLASTIC VALUE CHAIN MATHEMATICAL MODELLING Feedstock production PHA accumulation Process optimization PHA production VFA production PHA downstream INTEGRATION INTO LCA processing LCIA & Bioplastic shaping and Early scale-up compounding interpretation Data LCI Bioplastic use Best practices collection construction Bioplastic end-of-life Data collection LCI Long-term templates methodologies environmental impacts 3 LITERATURE REVIEW Bioplastic value chain hotspot: PHA downstream processing Feedstock production PHA production PHA downstream processing Bioplastic shaping and compounding Optimization of the environmental performance Bioplastic use Bioplastic end-of-life 4 Product requirements and processes selection Quality Chemical impurities High molecular weight Comply EU No 10/2011? High-grade (H) Low-grade (L) G Feedstock Culture Method TRL G Feedstock Culture Method TRL Acetone Acetone H1 Glucose Pure 9 L1 Methane Pure 4 extraction extraction HPH + SDS Osmotic H2 Food waste Pure 9 Canning Halophilic digestion L2 shock + SDS 4 wastewater bacteria NaOH + Lysol digestion H3 Oleic acid Pure 4 digestion Mixed NaClO + SDS L3 Wastewater 4 culture digestion Glucose, Ethyl acetate H4 Pure 6 extraction Molasses Fusel alcohols soybean oil L4 Pure 8 byproducts extraction 5 Scenarios definition 6 Goal & Scope 7 Life cycle impact assessment: 1 kg high-grade PHA 8 Life cycle impact assessment: 1 kg low-grade PHA 9 Optimization of the environmental performance Technology Hotspot Scenario assessed Result Oil as heat source Heat consumption in solvent Solvent extraction recovery Natural gas as heat source Chemicals are not recovered Chemical digestion Chemicals consumption Chemical are recovered Electricity consumption in High-carbon electricity mix (Polish) Mechanical disruption HPH Low-carbon electricity mix (Swedish) Improvement Environmental impacts reduction Process Framework actions GWP Human toxicity Fossil depletion L2 Larger facilities with Heat 83% 50% 73% L4 available residual vapor integration 12% 13% 11% 10 Conclusions • Most promising PHA downstream processes were identified and evaluated • Preliminary insights for the optimization of their environmental performance were provided • Solvent extraction require high amounts of energy. Heat integration and the utilization so-called green solvents can reduce the environmental impacts • Chemical digestion shows a better environmental performance when is combined with mechanical disruption or chemicals are recovered • High pressure homogenisation is the most promising method from a environmental perspective 11 Preliminary optimization of the environmental performance of PHA downstream processing [email protected] www.usc.es/biogroup USABLE PACKAGING Call: H2020-BBI-JTI-2018 EU ID: 836884.

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