At present, there is a lack of understanding regarding the extent to which various sources contribute to the total incoming load of microplastics (MPs) into wastewater treatment plants (WWTPs). This study investigated the contribution of an industrial textile laundry facility (ITLF) to the overall influx of MPs and their removal in two WWTPs. MPs were analysed by means of microscopic quantitative analysis in the wash water from a large textile laundry facility, as well as in the influent of the receiving WWTP. Additionally, influent and effluent flows of two WWTPs were analysed. Results demonstrated that a single-point emitter of MPs, i.e. an ITLF, contributed substantially (13%) to the overall influx of MPs in a WWTP. MPs were effectively removed (≥ 99.8% removal, particle size > 50 µm) in two separate WWTPs. As indicated in this study, actions mitigating the emission of MPs from single-point emitters are worthwhile and could be more cost-effective than implementing additional treatment processes in the WWTPs.

Hoewel de rwzi’s Amsterdam-West en Horstermeer meer dan 99,8% van de microplastics verwijderen, blijft het absolute aantal dat in het milieu terechtkomt aanzienlijk. Tevens bleek dat één industriële textielwasserij verantwoordelijk is voor 13% van het totale aantal microplastics dat de rioolwaterzuivering binnenkomt.