Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 55, Issue 24, Pages 16597-16606Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c02152
Keywords
Granular-activated carbon; nitrate removal; electrical transformation; adsorption; column regeneration
Categories
Funding
- Riverside Public Utility grant program
- US Environmental Protection Agency P3 program [3677001-0]
- IGERT: water sense.water social, engineering, and natural sciences engagement program [1144635]
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The study developed a flow-through, electrically charged, granular-activated carbon-filled column for effective nitrate removal from groundwater. High removal rate was achieved through a combination of electrosorption and electrochemical transformation, with the column being readily regenerated by reversing the polarity of the applied potential.
Nitrate removal from groundwater remains a challenge. Here, we report on the development of a flow-through, electrically charged, granular-activated carbon (GAC)-filled column, which effectively removes nitrate. In this system, the GAC functioned as an anode, while a titanium sheet acted as a cathode. The high removal rate of nitrate was achieved through a combination of electrosorption and electrochemical transformation to N-2. The column could be readily regenerated in situ by reversing the polarity of the applied potential. We demonstrate that in the presence of chloride, the mechanism responsible for the observed nitrate removal involves a combination of electroadsorption of nitrate to the anodically charged GAC, electroreduction of nitrate to ammonium, and the oxidation of ammonium to N-2 gas by reactive chlorine and other oxidative radicals (with nearly 100% N-2 selectivity). Given the ubiquitous presence of chloride in groundwater, this method represents a ready, green, and sustainable treatment process with significant potential for the remediation of contaminated groundwater.
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