Abstract
Biogas production and wastewater quality from anaerobic digesters were studied to determine whether sound at sonic frequencies (< 20,000 Hz) could enhance their performance. In three trials with increasing waste loading rates, each of 100-day duration, the performance of control and sound-treated digesters was compared. Anaerobic digesters exposed to sound produced approximately 12% more biogas than did non-exposed digesters, and sound-treated digestate had significantly lower chemical oxygen demand. Sludge at the end of the 100-day digestion averaged 19% less carbon and 18% less nitrogen in sound-treated digesters as compared to sludge from untreated digesters. Although the mechanism(s) responsible for enhanced biogas production due to sound exposure are unknown, recordings of sound-treated digesters indicate that acoustically induced cavitation may play a role.
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