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  Indian J Med Microbiol
 

Figure 3: Effect of sonication times on chemical oxygen demand and biological oxygen demand removal in the ferro-sonication process (ferrous sulfate dosage: 8 mmol, input power: 120 W, and solution pH of 3)

Figure 3: Effect of sonication times on chemical oxygen demand and biological oxygen demand removal in the ferro-sonication process (ferrous sulfate dosage: 8 mmol, input power: 120 W, and solution pH of 3)