Figure 2.

Change of the effluent conductivity by using FCDI when the feed water contains (A) 50, (B) 20, or (C) 10 mg NO₃-N L⁻¹. All experiments were conducted in a single-pass, constant-current mode. Flow electrode = 10 wt% carbon in 1,000 mg NaCl L⁻¹ electrolyte. The legends in the figures indicate different HRTs. The operating time for electrosorption is 1,200~1,800 s. Lines serve to guide the eye.