Purifying or polluting? Tracing membrane-based microplastics release for long-term drinking water safety.

Area of Science:

• Environmental Science
• Materials Science
• Water Treatment Technology

Background:

• Microplastics (MPs) pose health risks due to bioaccumulation.
• Drinking water treatment membranes may release MPs, creating a paradoxical contamination risk.
• Understanding MPs release from membranes is crucial for ensuring water safety.

Purpose of the Study:

• To quantify and characterize MPs release from different membrane materials.
• To investigate MPs generation under simulated drinking water treatment conditions (pre-oxidation, chemical cleaning).
• To identify factors influencing MPs release and inform mitigation strategies.

Main Methods:

• Systematic quantification and characterization of MPs released from three membrane types.
• Simulated pre-oxidation and chemical cleaning processes.
• Analysis of MPs size distribution and material properties.

Main Results:

• Both pre-oxidation and chemical cleaning significantly increased MPs generation via polymer degradation.
• Different membrane materials exhibited distinct MPs release profiles, influenced by material properties.
• The majority of released MPs were in the 1-5 µm size range, a critical safety concern.

Conclusions:

• Membrane material selection is pivotal for minimizing MPs release during water treatment.
• Understanding degradation mechanisms and operating conditions is key to controlling secondary MPs contamination.
• Optimized operational control can ensure membrane processes remain net purifying, safeguarding drinking water.