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Unveiling Chemical-Microbial Cascade Risk Factors from Plastic Pipe Leaching in Drinking Water.

Mengqing Fan1,2, Ziqian Wang1,2, Mingchen Yao1,2

  • 1Key Lab of Aquatic Chemistry, State Key Lab of Regional Environment and Sustainability, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

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Summary
This summary is machine-generated.

Plastic pipes leach chemicals that alter drinking water microbes, increasing health risks. Polyethylene (PE) pipes pose the highest chemical risk, necessitating integrated safety assessments for plastic water systems.

Keywords:
FT-ICR MSdissolved organic matter moleculesmetagenomicsmicrobial risksplastic leaching

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Area of Science:

  • Environmental Science
  • Microbiology
  • Public Health

Background:

  • Plastic pipes are common in drinking water distribution, but their effects on water quality are not fully understood.
  • Existing safety assessments often overlook the combined chemical and microbial risks from plastic pipe leaching.

Purpose of the Study:

  • To investigate the chemical leaching and microbial risks associated with plastic pipes in drinking water.
  • To analyze how leached substances from plastic pipes affect microbial communities and water quality.

Main Methods:

  • Utilized Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS) to analyze leached chemicals.
  • Employed metagenomic analysis to assess changes in microbial communities and identify risks.
  • Compared chemical leaching and microbial impacts across different plastic pipe materials: polyethylene (PE), polyvinyl chloride (PVC), and polypropylene random copolymer (PPR).

Main Results:

  • Plastic pipes continuously release dissolved organic matter (DOM), including bisphenols (BPs) and organophosphate esters (OPEs).
  • Leached DOM reshapes microbial communities, promoting chlorine resistance and opportunistic pathogens under chlorinated conditions.
  • Under nonchlorinated conditions, leached DOM accelerates microbial growth and enriches antibiotic resistance genes (ARGs), OPs, and virulence factors (VFs).
  • Polyethylene (PE) showed the highest chemical risk, releasing significant TCPP and BPF.
  • Polyvinyl chloride (PVC) supported the highest opportunistic pathogen (OP) abundance, while polypropylene random copolymer (PPR) fostered the greatest OP diversity.

Conclusions:

  • Findings challenge current drinking water safety standards by highlighting the interplay between chemical leaching and microbial risks.
  • An integrated risk assessment framework is crucial for evaluating the safety of plastic drinking water pipes.
  • Greater attention must be paid to the chemical and microbial consequences of plastic pipe leaching to ensure public health.