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Amid an escalating plastics crisis, algal polyhydroxyalkanoates (PHAs) produced by microalgae, cyanobacteria, and phototrophic bacteria emerge as a biologically circular alternative that couples CO₂ fixation, wastewater nutrient recovery, and true end-of-life biodegradability. A SWOT frames the field with equal weight on promise and constraints: photosynthetic “green alchemists” that convert sunlight, CO₂, and effluents into polymers, yet still limited by yield, productivity, and solvent-intensive downstream recovery that keep costs above petro-plastics. The chapter follows the trajectory from bench to deployment within multiproduct biorefineries co-valorizing pigments, lipids, and bioactive peptides to amortize CAPEX/OPEX and preserve environmental gains. Through Lenses for the Future, three levers are articulated: technology (redirecting carbon flux, light/gas-transfer-aware photobioreactors, greener recovery), economics (waste-derived feedstocks, scale and learning effects, cost reduction via co-products), and policy (EPR, green procurement, carbon-aligned instruments). Emphasis is placed on co-location with CO₂ point sources and wastewater streams, integration of data-driven control, and decision-making grounded in TEA/LCA, outlining a credible pathway for photosynthetic PHAs to transition from niche materials to mainstream, economically competitive plastics compatible with planetary boundaries.

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Algal Polyhydroxyalkanoates: Biofabrication of Sustainable Plastics and a SWOT-Based Perspective on Their Commercialization

  • 章节

  • 发表日期：

    2026年

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  • Poonam Kumari,
  • S. Venkata Mohan

摘要

Amid an escalating plastics crisis, algal polyhydroxyalkanoates (PHAs) produced by microalgae, cyanobacteria, and phototrophic bacteria emerge as a biologically circular alternative that couples CO₂ fixation, wastewater nutrient recovery, and true end-of-life biodegradability. A SWOT frames the field with equal weight on promise and constraints: photosynthetic “green alchemists” that convert sunlight, CO₂, and effluents into polymers, yet still limited by yield, productivity, and solvent-intensive downstream recovery that keep costs above petro-plastics. The chapter follows the trajectory from bench to deployment within multiproduct biorefineries co-valorizing pigments, lipids, and bioactive peptides to amortize CAPEX/OPEX and preserve environmental gains. Through Lenses for the Future, three levers are articulated: technology (redirecting carbon flux, light/gas-transfer-aware photobioreactors, greener recovery), economics (waste-derived feedstocks, scale and learning effects, cost reduction via co-products), and policy (EPR, green procurement, carbon-aligned instruments). Emphasis is placed on co-location with CO₂ point sources and wastewater streams, integration of data-driven control, and decision-making grounded in TEA/LCA, outlining a credible pathway for photosynthetic PHAs to transition from niche materials to mainstream, economically competitive plastics compatible with planetary boundaries.