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Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Electrochemically and Bioelectrochemically Induced Ammonium Recovery

Published on: January 22, 2015

Nitrobenzene removal in bioelectrochemical systems.

Yang Mu¹, René A Rozendal, Korneel Rabaey

¹Advanced Water Management Centre, The University of Queensland, St. Lucia, QLD 4072, Australia. yangmu@awmc.uq.edu.au

Environmental Science & Technology

|December 24, 2009

Summary

A novel bioelectrochemical system (BES) effectively removes toxic nitrobenzene from wastewater. This method also recovers energy and reduces the need for cosubstrates compared to traditional treatments.

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Area of Science:

Environmental Science
Electrochemistry
Biotechnology

Background:

Nitrobenzene is a persistent and toxic pollutant in industrial and agricultural wastewater.
Effective removal of nitrobenzene is crucial before discharge to prevent environmental damage.

Purpose of the Study:

To investigate the efficacy of a bioelectrochemical system (BES) for nitrobenzene removal.
To evaluate the coupled microbial oxidation of acetate at the anode and nitrobenzene reduction at the cathode.
To assess the impact of applied power on removal rates and energy recovery.

Main Methods:

Utilized a bioelectrochemical system (BES) with an anode for acetate oxidation and a cathode for nitrobenzene reduction.
Measured nitrobenzene removal and aniline formation rates under different operating conditions.
Investigated the effect of applied power and current density on system performance.

Main Results:

Achieved effective nitrobenzene removal (up to 1.29 mol m(-3) TCC d(-1)) with aniline formation (1.14 mol m(-3) TCC d(-1)).
Significantly enhanced removal and formation rates (8.57 and 6.68 mol m(-3) TCC d(-1), respectively) with applied power.
Demonstrated reduced organic cosubstrate requirements compared to anaerobic biological methods.
Observed that Coulombic efficiencies were dependent on current density.

Conclusions:

Bioelectrochemical systems offer an efficient method for nitrobenzene removal from wastewater.
Applied power enhances BES performance for nitrobenzene remediation.
BES technology presents a promising, energy-efficient alternative for treating nitrobenzene-contaminated effluents.