Biodegradability of cellulose diacetate in aqueous environments

This article investigates the biodegradability of cellulose diacetate, the most widely used form of cellulose acetate, in freshwater and marine environments using standardized laboratory simulation methods. Motivated by ongoing discussions about cellulose acetate’s role in litter and microplastic pollution, particularly from cigarette filters, the study evaluates how cellulose diacetate behaves in freshwater, seawater, and seawater-sediment systems.

The authors also examine the influence of microbial adaptation and explore whether prior abiotic hydrolysis is required before biodegradation can occur.

The findings show that cellulose diacetate underwent substantial biodegradation in all tested aquatic environments under the study conditions, exceeding 90% relative biodegradation in freshwater and seawater and showing strong evidence of non-persistence at the seawater-sediment interface. The results indicate that naturally occurring microbial communities can adapt to and metabolize cellulose diacetate with a degree of substitution of 2.5, without requiring extensive prior deacetylation. For industry, regulators, and researchers, these observations highlight the importance of evaluating cellulose acetate using realistic biodegradation methodologies and microbial communities when assessing environmental fate, product stewardship, material design, and sustainability performance.

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