Abstract
An intensified electrochemical process in an undivided cell using Cu–Zn alloy as cathode and Ti/IrO2–Pt as anode combined with bipolar iron particles (electro-iron system) has been developed. The performance of nitrate reduction was evaluated using synthetic groundwater. Results showed that the nitrate-N dropped rapidly from 50 to less than 10 mg/L within 100 min in the developed system at current densities in the range of 5–30 mA/cm2. Sodium chloride addition was found to have a positive effect on the system performance. No nitrite-N was detected during the electrolysis in the presence of sodium chloride. The concentration of total iron ion in the solutions was found to be less than 0.25 mg/L after 100 min electrolysis. Furthermore, the electrical energy consumption for nitrate reduction in the electro-iron system was saved by approximately 29.4–34.8 % at 5–30 mA/cm2. The developed system has been proved to promote electrochemical nitrate reduction and greatly improve the electrical energy efficiency.
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This was supported by National Natural Science Foundation (no. 31140082).
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Huang, W., Zhang, B., Li, M. et al. An electrochemical process intensified by bipolar iron particles for nitrate removal from synthetic groundwater. J Solid State Electrochem 17, 1013–1020 (2013). https://doi.org/10.1007/s10008-012-1956-4
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DOI: https://doi.org/10.1007/s10008-012-1956-4