Releasing of Microplastics from Pipes During Drinking Water Transportation

Abstract Submission: The potential contamination of drinking water by microplastics in distribution networks has become a growing concern, with an observed increase in microplastic concentration from the treatment plant to the household tap. This study investigates the generation of microplastics due to the degradation of pipe materials during water transportation. A laboratory setup at Aalborg University was employed to examine two common pipe materials, polyvinyl chloride (PVC) and polypropylene (PP), comparing both new and used pipes. Pipes were analyzed chemically and physically before and after each experiment, which lasted one week. During this period, the pipes were subjected to abrupt pressure fluctuations, including simulated water hammer events, created using automated valves to replicate operational activities in real-world distribution systems. The experiment also included the use of chlorine to simulate residual chlorine levels present in typical water networks, allowing for an evaluation of its interaction with pipe materials. A total of 12 experiments were conducted. After each test, water samples were collected and filtered for analysis using micro-FTIR. The analysis focused on the mass, count, shape, and composition of the microplastic particles. The results reveal a correlation between pipe material, network operation conditions, and microplastic release. This study provides insights into how pipe material selection and operational practices in water distribution networks influence the generation and presence of microplastics in drinking water, with important implications for water quality management and regulatory frameworks.

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