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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Electrochemically mediated phosphorus and energy recovery from digested effluent.

Ling-Ling Lai1, Si-Zhuo Wan1, Mahmood Qaisar2

  • 1School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an, 710055, PR China.

Journal of Environmental Management
|November 13, 2023
PubMed
Summary

Optimizing iron-air fuel cells for phosphorus recovery from wastewater is crucial. Adjusting pH, area ratio, and spacing significantly improves phosphate removal, vivianite yield, and energy generation while reducing costs.

Keywords:
Digested effluentElectricity generationIron-air fuel cellPhosphate recoveryVivianite

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Area of Science:

  • Environmental Engineering
  • Electrochemistry
  • Wastewater Treatment

Background:

  • High phosphorus concentrations in wastewater pose environmental risks.
  • Phosphorus recovery from wastewater is essential for resource sustainability.
  • Iron-air fuel cells show promise for simultaneous phosphorus recovery and energy generation.

Purpose of the Study:

  • To optimize the performance of iron-air fuel cells for phosphorus recovery.
  • To investigate the impact of wastewater properties and device parameters on fuel cell efficiency.
  • To evaluate the economic viability of the optimized system.

Main Methods:

  • Adjusting initial wastewater pH.
  • Modifying anode/cathode area ratio.
  • Varying electrode spacing.
  • Analyzing phosphate removal efficiency, vivianite yield, and electricity generation.

Main Results:

  • Acidic pH (5.78), an anode/cathode area ratio of 1.3, and 5 cm electrode spacing maximized vivianite yield.
  • Optimal conditions for maximum electric energy output were pH 5.78, an area ratio of 0.4, and 7.5 cm spacing.
  • The iron-air fuel cell system demonstrated a potential cost saving of 65.6% compared to traditional methods.

Conclusions:

  • Optimized operating conditions enhance phosphorus recovery and energy generation in iron-air fuel cells.
  • The iron-air fuel cell offers a cost-effective alternative for wastewater phosphorus management.
  • This technology contributes to sustainable phosphorus resource utilization and wastewater treatment.