Biological perchlorate reduction: which electron donor we can choose?

Area of Science:

• Environmental microbiology
• Bioremediation technologies
• Water treatment

Background:

• Perchlorate (ClO4-) contamination poses environmental and health risks.
• Biological reduction by perchlorate-reducing bacteria (PRB) is a promising remediation strategy.
• PRB require an external electron donor for perchlorate transformation into chloride.

Purpose of the Study:

• To review the application of diverse electron donors in biological perchlorate reduction.
• To analyze the impact of electron donors on perchlorate removal efficiency.
• To assess the influence of electron donors on the biological activity of PRB.

Main Methods:

• Literature review of studies on biological perchlorate reduction.
• Categorization of electron donors into organic, inorganic, and cathode-based systems.
• Analysis of treatment efficiency and PRB activity data from various studies.

Main Results:

• A wide range of organic (e.g., acetate, ethanol) and inorganic (e.g., H2, Fe0) electron donors are effective.
• Cathodes also serve as viable electron donors for perchlorate reduction.
• Electron donor choice significantly impacts perchlorate degradation rates and PRB viability.

Conclusions:

• Optimizing electron donor selection is key for efficient bioremediation of perchlorate-contaminated water.
• Understanding donor-microbe interactions enhances bioremediation strategies.
• Flexible donor selection provides adaptable solutions for perchlorate removal.