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Researchers isolated denitrifying bacteria from bamboo for nitrate removal from drinking water. Suspended microorganisms (SM) achieved over 96% efficiency with carbon sources, yielding water meeting drinking standards.

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Area of Science:

  • Environmental Microbiology
  • Water Treatment Technologies

Background:

  • Biological denitrification is a promising method for removing nitrate from drinking water.
  • Conventional methods often rely on sewage sludge for microbiota, posing potential contamination risks.

Purpose of the Study:

  • To isolate and utilize denitrifying bacteria from bamboo as a sustainable source for nitrate removal.
  • To optimize denitrification parameters and evaluate the efficiency of immobilized microorganisms (IM) and suspended microorganisms (SM).

Main Methods:

  • Isolation of denitrifying bacteria from bamboo.
  • Optimization of denitrification by varying pH, temperature, nitrate concentration, carbon sources, and C/N ratios.
  • Physicochemical analysis of treated water for drinking water standards.

Main Results:

  • Denitrification using IM achieved 73% efficiency without external carbon sources.
  • Suspended microorganisms (SM) demonstrated high efficiency (96.46-98.58%) with ethanol, glucose, or glycerol.
  • SM-treated water met drinking water standards for color and turbidity after physicochemical treatment.

Conclusions:

  • Bamboo is a viable source for isolating effective denitrifying microorganisms.
  • Suspended microorganisms (SM) with appropriate carbon sources offer superior nitrate removal efficiency and water quality compared to immobilized microorganisms (IM).