Simultaneous removal of nitrate and its intermediates by use of bipolar electrochemistry

Simultaneous removal of nitrate and its intermediates by use of bipolar electrochemistry Electrochemical removal of nitrate and its intermediates, ammonia and nitrite, by use of a bipolar electrode connection, was investigated under different experimental conditions (initial pH (4, 7, or 10) current density (5, 10, or 15 mA/cm2), nitrate concentration (25, 50, or 75 mg/L NO3 −-N), with or without NaCl as supporting electrolyte). The results showed that nitrate and intermediates were significantly removed in the presence of NaCl as supporting electrolyte; ammonia and nitrite were not removed in the absence of NaCl. Nitrate was reduced from 50 to 8.65 mg/L NO3 −-N in 150 min; under these conditions final ammonia and nitrite concentrations were 3.36 mg/L NH3 and 0.01 mg/L NO2 −-N, respectively. Denitrification times required to reduce nitrate concentration to the recommended standard for drinking water of 10 mg/L NO3 −-N were 180, 120, and 60 min at current densities of 5, 10, and 15 mA/cm2, respectively; initial nitrate concentration is 50 mg/L NO3 −-N. The rate of reduction of nitrate at pH 7 and 10 was greater than at pH 4. With increasing initial nitrate concentration the time required to achieve the recommended standard for drinking water was increased. Research on Chemical Intermediates Springer Journals

Simultaneous removal of nitrate and its intermediates by use of bipolar electrochemistry

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Springer Netherlands
Copyright © 2013 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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