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Related Experiment Videos

Biodegradation of N-methylmorpholine-N-oxide

G Meister1, M Wechsler

  • 1Department of Environmental Protection, Lenzing AG, Austria.

Biodegradation
|November 20, 1998
PubMed
Summary
This summary is machine-generated.

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Activated sludge can be adapted to degrade N-Methyl-N-oxide (NMMO), a cellulose solvent, within 15-20 days. This adapted sludge effectively purifies NMMO-containing wastewater in treatment plants.

Area of Science:

  • Biotechnology
  • Environmental Science
  • Chemical Engineering

Background:

  • N-Methyl-N-oxide (NMMO) is a key solvent for cellulose dissolution, enabling fibre production.
  • Conventional biodegradation tests suggest NMMO is persistent in wastewater.
  • Effective NMMO wastewater treatment is crucial for sustainable cellulose processing.

Purpose of the Study:

  • To investigate the adaptation of activated sludge to NMMO.
  • To determine if NMMO-containing wastewater can be purified in conventional treatment plants.
  • To elucidate the biodegradation pathway of NMMO by adapted sludge.

Main Methods:

  • Adaptation of non-adapted activated sludge to NMMO over 15-20 days.
  • Monitoring of NMMO and metabolite degradation by adapted sludge.

Related Experiment Videos

  • Analysis of biodegradation pathway, including NMMO reduction and demethylation.

    • Main Results:

    • Activated sludge successfully adapted to NMMO within 15-20 days.
    • Adapted sludge degraded NMMO and metabolites to undetectable levels.
    • Degradation pathway involves reduction to N-methylmorpholine, then demethylation to morpholine, followed by ring cleavage.
    • Successful adaptation requires a high sludge age.

    Conclusions:

    • Activated sludge can be adapted for efficient NMMO biodegradation.
    • Conventional wastewater treatment plants can purify NMMO-containing effluents.
    • Understanding the degradation pathway is key to successful sludge adaptation and wastewater treatment.