Fig. 4
From: Evaluating the efficiency of formaldehyde degradation from aqueous environment by sonozone technique
The effect of sonozone in removing formaldehyde from contaminated water 110, 220, and 330 mg/L in different (a) pHs, (3, 7, 11), electrical powers (150 W), (b) and ozone concentrations (0.2, 0.4, 0.6 mg/min L) (c) times (8, 16, and 32 min).
