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Effects of sewer effluent with QSA on denitrification of nitrite (A) and nitrate (B). The notation “x- dilution” meant the effluent was diluted with deionized water for appointed times; “no C” meant no extra COD stock solution. Asterisks (∗) manifest significant differences compared to the control (one-way ANOVA, ns, p > 0.05, ∗ p < 0.05, ∗∗ p < 0.01).
