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Effect of Ultrasound on Methanogenic Activity of Anaerobic Granules

For the first time, ultrasound was applied to enhance the activity of anaerobic granules. Specific methanogenic activity (SMA), carbohydrate and acetic acid analyses were performed to investigate how the limited intensity of ultrasound improves anaerobic digestion and activates methanogenic bacteria. The results of our study showed increases in SMA by 26 to 84% (St. Louis plant) and 163 to 220% (Newark plant) under the conditions of 50, 100, and 150 W for 5 min at a frequency of 40 kHz. The concentrations of soluble carbohydrates also increased 1.9 to 6.1 times as a result of ultrasound treatment.