Benzene Diffusion and Partitioning in Contaminated Drinking Water Pipes under Stagnant Conditions

Area of Science:

• Environmental Science
• Water Quality
• Polymer Science

Background:

• Wildfires increasingly contaminate drinking water with benzene.
• Polyethylene pipes in water systems are susceptible to benzene permeation.
• Uncertainty exists regarding benzene's interaction with polyethylene pipes, impacting sampling and remediation.

Purpose of the Study:

• To investigate the kinetics and equilibria of benzene uptake and release by various polyethylene pipes.
• To address data gaps in understanding benzene-pipe interactions in water distribution systems.
• To inform remediation strategies for benzene-contaminated plumbing.

Main Methods:

• Studied diffusion and partitioning of benzene in different polyethylene pipe types.
• Included analysis of field samples from water distribution systems.
• Utilized diffusion modeling to interpret results.

Main Results:

• All studied polyethylene pipes showed similar benzene partitioning behavior.
• Minor differences in benzene uptake/release kinetics were observed among pipe types.
• These kinetic differences were not practically significant for the examined contamination scenario.

Conclusions:

• Polyethylene pipe properties have minor effects on benzene contamination dynamics.
• The study provides crucial data for modeling benzene diffusion in pipes.
• Results support informed remediation decisions for benzene-contaminated water systems with polyethylene infrastructure.