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Area of Science:

  • Environmental Science
  • Aquatic Ecology
  • Bioremediation

Background:

  • Pesticide runoff, including bifenthrin used in tobacco cultivation, contaminates aquatic ecosystems.
  • Bifenthrin poses risks to aquatic life and human health.
  • Southern Brazil's economy relies heavily on agriculture, increasing pesticide exposure risks.

Purpose of the Study:

  • To investigate microalgae's efficacy in removing bifenthrin pesticide from water.
  • To optimize phycoremediation conditions for pesticide removal.
  • To assess biodegradation and biosorption as removal mechanisms.

Main Methods:

  • Microalgae were isolated from a Brazilian reservoir.
  • Batch experiments evaluated biodegradation, biosorption, pH, inoculum percentage, and photoperiod over 20 days.
  • Bifenthrin levels were quantified using gas chromatography-mass spectrometry (GC-MS).

Main Results:

  • Microalgae achieved approximately 99% removal of bifenthrin.
  • Photodegradation contributed significantly (>77%) to pesticide removal.
  • Optimal conditions included a 20% inoculum and an 18:6 hour photoperiod.

Conclusions:

  • Microalgae demonstrate high efficiency in removing bifenthrin pesticide from contaminated water.
  • Phycoremediation offers a sustainable solution for managing pesticide pollution in aquatic environments.
  • Optimized conditions enhance the effectiveness of microalgae-based bioremediation.