Nitrate reduction using an electrode as direct electron donor in a biofilm-electrode reactor
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).
Journal: Process Biochemistry - Volume 40, Issue 10, October 2005, Pages 3383–3388