Article ID Journal Published Year Pages File Type
36675 Process Biochemistry 2005 6 Pages PDF
Abstract

Nitrate reduction using an electrode as a direct electron donor in a biofilm-electrode reactor was investigated to treat an aqueous solution containing high concentrations of nitrate. In the absence of organic substances, nitrate was reduced by micro-organisms consuming electrons from the electrode. The maximum nitrate reduction rate was 98% at an applied current of 200 mA. As nitrate concentrations decreased, the oxidation–reduction potential (ORP) gradually decreased from −80 to −260 mA. The maximum volumetric nitrate removal rate obtained from the biofilm-electrode reactor was 0.17 mg NO3−-N/(cm2 (biofilm surface area) day).

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Physical Sciences and Engineering Chemical Engineering Bioengineering
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