Fig. 6. Effect of Fe3+ or Cu2+ addition on nitrate removal. Initial conditions: 5% precoated iron + 30 mg NO-3–N L-1 + (a) 100 mg Fe3+ L-1 (FeCl3) or (b) 115 mg Cu2+ L-1 (CuCl2), without initial pH adjustment.
Fig. 6. Effect of Fe3+ or Cu2+ addition on nitrate removal. Initial conditions: 5% precoated iron + 30 mg NO-3–N L-1 + (a) 100 mg Fe3+ L-1 (FeCl3) or (b) 115 mg Cu2+ L-1 (CuCl2), without initial pH adjustment.