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Updated: May 31, 2026

Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
Published on: October 24, 2025
Enrichment of potential polyvinyl chloride and polycarbonate microplastic-degrading bacteria and their distribution
Qixuan Wu1, Jingchun Feng2, Yongji Huang3
1Institute of Smart Marine Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
Abstract:
Microbial degradation represents a promising remediation strategy for polyvinyl chloride (PVC) and polycarbonate (PC) microplastics, which have been widely detected in the Haima cold seeps. However, the diversities and distribution of PVC- and PC-degrading bacteria in cold seep environments remain poorly understood. Therefore, this study combined 1-year in situ incubation and 189-day indoor enrichment experiments to characterize the diversity of plastic-degrading bacteria in the Haima cold seeps. The results showed that the enriched communities could grow using PVC or PC films as the sole carbon source, and the plastic surfaces exhibited clear signs of biodegradation. Dietzia, Pseudarthrobacter, and Saccharopolyspora dominated the bacterial communities of both PVC and PC groups during enrichment. A total of 39 potential PVC-degrading ASVs and 36 potential PC-degrading ASVs were identified based on changes in abundance. Among these ASVs, Dietzia and Bacillus appeared to play crucial roles in degrading both plastics. Additionally, the identified degraders were widely distributed in cold seep environments, with a higher abundance in seawater than in sediments. Correlation analysis suggested that PC plastic-degrading bacteria preferred the high-nutrient sediment environment over that favored by PVC degraders. This study revealed the diversity and distribution characteristics of plastic-degrading bacteria in cold seep environments.
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