This paper addresses the development of a nitrate-selective electrodeionization process for the treatment of water streams. A bench-scale model with an active cross-sectional area of 155 cm 2 was constructed and formed the basis of the investigations. Experiments were carried out with synthetic water streams. Nitrate fluxes in the range of 2.5 × 10 -6 to 9.0 × 10 -6 meq/cm 2/sec have been observed depending on the operating conditions. Results indicate that in solutions of NaNO 3 alone, fluxes increased by 40% when the voltage per membrane pair increased from 2.0 to 5.0 volts. Energy consumption increased from 300 to 1200 J/eq over the same range. Water flow rate had negligible impact Resin type was found to impact on nitrate flux and energy consumption. When multiple species were present nitrate fluxes decreased, but NO 3 was selectively removed relative to chloride and sulphate. The results of the testing suggest that lower current densities are more efficient than higher current densities.

2000 Annual Conference - Canadian Society for Civil Engineering
Department of Civil and Environmental Engineering

Meyer, N., Parker, W., & van Geel, P. (2000). Treatment of nitrate contaminated water by electrodeionization. Presented at the 2000 Annual Conference - Canadian Society for Civil Engineering.