An Investigation on Microplastics at Wastewater Confluence Points in the Southern Coastal Regions of Tamil Nadu, India.

This study investigates microplastic prevalence in wastewater mixing point from major coastal cities in Tamil Nadu, India, highlighting a significant environmental challenge. In January 2023, 16 wastewater samples revealed microplastics (< 5 mm) ranging from 20 to 51 items per litre. Predominant colours were pink, black, brown, white, green, blue, red, and yellow, with orange being the least common. Microplastic sizes mostly varied from 0.05 to 0.5 mm. Fiber shaped MPs are the predominant, followed by fragments, foam, film and pellets. Predominant polymer types were polyethylene (45%), polystyrene (18%), and polypropylene (15%). These results emphasize wastewater's significant role in introducing microplastics into coastal ecosystems from domestic and industrial sources. Addressing this issue requires effective management plans, including advanced wastewater treatment, public awareness campaigns and regulatory measures. Further research is essential to comprehensively assess ecological impacts and inform sustainable management strategies.