Biodegradation of bioplastic straws compared to conventional plastic straws

Abstract

This experimental study aimed to investigate the biodegradation of commercially available bioplastic straws compared to conventional plastic straws using four types of plastic straws: polypropylene (PP), bio-polybutylene succinate (PSB) mixed with polylactic acid (PLA), PLA alone, and bagasse straws. The tubes were cut into small sizes, buried in soil, watered to simulate natural degradation conditions, and placed in the same environment at the College of Medicine and Public Health, Ubon Ratchathani University. The tubes were excavated, weighed, and analyzed using a microscope and scanning electron microscopy. Results showed that the 1 cm small tubes experienced greater weight loss than the 2 cm tubes. Straws made from PSB mixed with PLA showed the highest weight loss of 46%. Bioplastic straws made from PLA alone showed the least weight loss. SEM images showed noticeable surface changes in straws made from natural materials and bioplastics compared to PP straws, especially in the 2 cm tubes. The findings suggest that using biodegradable straws, especially those made from natural materials, can effectively mitigate plastic pollution and preserve the environment.