An Integrated Electrochemical System for Synergistic Cathodic Nitrate Reduction and Anodic Sulfite Oxidation.

However, in the later stages of the reaction, the concentration of NO 2 − –N showed a decreasing trend, while NH 4 + –N continued to increase ( Figure 3 b,c).

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In the early stage of the reaction, the concentrations of both NO 2 − –N and NH 4 + –N showed an increasing trend.

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The NH 4 + –N production showed a trend of increasing and then decreasing, with the highest production at the initial SO 3 2− –S concentration of 1.0 g L −1 .

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