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Effect of HA concentration on ARAC degradation kinetics (a), and corresponding effect of [HA] on the pseudo-first order rate constant (k) for US and US/chlorine treatment of ARAC (b) (conditions: frequency: 600 kHz, power: 120 W, C0 = 5 mg L−1 (10 µM), [chlorine]0 = 0.25 mM, [HA]0 = 0–15 mg L−1, 25 ± 1 °C, pH 5.5). HA: Humic acid.
