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Related Concept Videos

Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.

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Screening Disinfection Byproducts in Arid-Coastal Wastewater: A Workflow Using GC×GC-TOFMS, Passive Sampling, and NMF

Muhammad Usman Siddiqui1, Muhammad Sibtain1, Farrukh Ahmad2,3

  • 1Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Islamabad 48000, Pakistan.

Journal of Xenobiotics
|May 28, 2024
PubMed
Summary
This summary is machine-generated.

This study identified numerous disinfection byproducts (DBPs) in treated wastewater using advanced analytical techniques. Many DBPs showed significant aquatic toxicity and environmental persistence, highlighting risks from wastewater treatment processes.

Keywords:
GC×GC-TOFMSNMF spectral deconvolutiondisinfection byproductshazard assessmentpassive sampler

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Water Treatment

Background:

  • Disinfection of municipal wastewater is crucial for pathogen control.
  • Disinfection processes generate numerous, often unregulated, disinfection byproducts (DBPs).
  • Analytical challenges hinder the identification and risk assessment of diverse DBPs.

Purpose of the Study:

  • To develop and apply a comprehensive analytical workflow for suspect screening of DBPs in treated wastewater.
  • To identify and characterize DBPs formed during tertiary wastewater treatment.
  • To assess the environmental fate, persistence, and toxicity of identified DBPs.

Main Methods:

  • Utilized polydimethylsiloxane (PDMS) passive samplers for sample collection.
  • Employed comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC×GC-TOFMS).
  • Applied non-negative matrix factorization (NMF) for spectral deconvolution and advanced methods for peak assignment and DBP identification.

Main Results:

  • Successfully isolated 22 candidate DBPs and identified seven additional DBPs using an eight-filter screening process.
  • NMF improved spectral matching by 17%, and advanced validation methods enhanced peak assignment accuracy.
  • Detected prevalent brominated DBPs, with 11 showing high environmental persistence and significant aquatic toxicity, including developmental and endocrine-disrupting effects.

Conclusions:

  • The integrated analytical approach provides a powerful tool for DBP identification and risk assessment in environmental monitoring.
  • Identified DBPs pose significant risks to aquatic ecosystems due to their toxicity and persistence.
  • Wastewater treatment disinfection warrants further investigation regarding DBP formation and mitigation strategies.