Nitrate removal by electro-bioremediation technology in Korean soil

Area of Science:

• Environmental Science
• Agricultural Science
• Microbiology

Background:

• Elevated nitrate concentrations in agricultural soils pose a global environmental and industrial challenge.
• Traditional remediation methods often face limitations in efficiency and scope.

Purpose of the Study:

• To investigate the efficacy of electro-bioremediation, a novel hybrid technology, for soil nitrate removal.
• To isolate, identify, and test the nitrate-reducing capabilities of Bacillus spp. in soil remediation.

Main Methods:

• Isolation and identification of nitrate-reducing bacteria (Bacillus spp.) using 16s RNA sequencing.
• Testing bacterial efficiency in broth and subsequent inoculation into soil within an electrokinetic (EK) cell.
• Application of a 20V electric potential across electrodes in the EK cell to facilitate electrokinetics and bioremediation.

Main Results:

• In the electrokinetic system without bacteria, nitrate concentration was higher at the anode.
• The combined electro-bio kinetic (EK+bio) system resulted in near-complete nitrate removal across all soil areas.
• Bacillus spp. enhanced nitrate reduction (denitrification) by supplying electrons from organic matter degradation.
• Electrokinetics controlled nitrification at the cathode by reducing ammonium ions to nitrogen gas.

Conclusions:

• Electro-bioremediation, integrating electrokinetics and bioremediation with Bacillus spp., is highly effective for soil nitrate removal.
• The hybrid technology leverages electroosmosis and bacterial physiological activity for efficient nitrate reduction.
• This approach offers a promising solution for mitigating nitrate pollution in agricultural environments.