Removal of Microplastic from Wastewater Treatment Plants

Since water treatment facilities provide a workable alternative for expelling microplastics from the surroundings, this review examines the overall and stage-by-stage effectiveness of different water treatment techniques in expelling microplastics and the innovations for handling water treatment waste products. Over 80 academic papers over the last decade were analyzed. Primary treatment at wastewater treatment plants has been claimed to remove between 16.5 and 98.4% of microplastics; however, this review demonstrates that the effectiveness of these technologies varies greatly. A preliminary treatment sewage treatment facility’s aggregate microplastic sorption capacity ranges from 78.1 to 100%, with stage-by-stage performance varying from 7.0 to 99.9%. As much as 99.9% of microplastics are eliminated during the tertiary treatment process, drinking water treatment plants typically remove 1.8–54.5% of microplastics during the initial coagulation and sedimentation process, while additional treatment increases this to an overall 88.6%. Experiments show that using a higher than typical dose of flocculent can greatly boost microplastic removal by up to 62%. The majority of microplastics that cannot be extracted using traditional methods end up in sludge. Sludge and membranes are identified as significant contributors to microplastics in water treatment, notwithstanding the review’s increasing focus on the ability of treating wastewater to remove microplastics from waterbodies. It advises improving water treatment by altering coagulation factors, introducing cutting-edge procedures to more efficiently remove microplastics, and possibly utilizing innovative sol-gel technologies. In order to lessen the chances of microplastics being released back into the environment, it proposes thermal pre-treatment of sludge.