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McGill Study Finds 50–75% Urine Mix Maximizes Microbial Fuel Cell Output

Lab experiments identified urine concentration as the primary driver of microbial fuel cell performance.

Microbial fuel cells used in a McGill University study are shown. Researchers say higher concentrations of urine improved electricity generation.
Researchers have found a cost-effective way to treat wastewater and generate energy simultaneously. (Representational image)

Overview

  • Researchers tested four dual-chamber microbial fuel cells over two weeks using synthetic wastewater blended with human urine at 20%, 50%, and 75%.
  • Higher urine fractions between roughly 50% and 75% increased electricity generation and improved pollutant removal by stimulating faster microbial activity.
  • Urine supplied essential ions and organic compounds that accelerated microbial growth, enhancing both power output and treatment efficiency.
  • Microbial communities shifted predictably with concentration, with Sediminibacterium prevailing near 50% urine and Comamonas dominating at 75%.
  • The team points to potential uses in rural sanitation, disaster relief and off-grid settings, and as low-cost biosensors for wastewater monitoring.