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. 2022 Jan 13;19(2):850. doi: 10.3390/ijerph19020850

Figure 3.

Figure 3

Effect of initial pH on COD (a) and TN (b) removal (no Cl, 10.0 mA·cm−2, diluted H2SO4, and NaOH solutions were used for pH adjustments, and pH 6 was the natural pH of simulated wastewater).