Those 'compostable' coffee pods that never actually break down in the dirt will disappear 300% faster if you turn them into biogas first.
March 25, 2026
Original Paper
Structural changes in PLA-based compostable packaging during mesophilic anaerobic digestion and their impact on composting biodegradation
SSRN · 6465231
The Takeaway
It reveals a 'chemical shortcut' for bio-plastics: the anaerobic digestion process used to create green energy pre-conditions the plastic, solving the common problem where 'compostable' items persist in the environment for years.
From the abstract
Residues from compostable packaging may persist in digestate after anaerobic digestion, raising concerns about their subsequent biodegradation. This study evaluated whether mesophilic anaerobic digestion (AD), followed by industrial composting, can improve the biodegradation of these residues. Compostable coffee capsules made of polylactic acid (PLA), poly(hydroxybutyrate-co-valerate) (PHBV), poly(butylene adipate-co-terephthalate) (PBAT), and poly(butylene succinate) (PBS) were used as model ma