The efficacy of ultrasonication as a pretreatment process for wastewater sludge prior to anaerobic digestion is evaluated with respect to the extent of sludge solubilization, particle size distribution, biogas production, and protein degradation. Primary and waste activated sludge from
municipal wastewater were treated with different ultrasonic intensities varying sonication time at a constant frequency. Results show that SCOD/TCOD ratio, volatile fatty acids, soluble protein, and gas production increased with sonication time, while total protein and particle size of the
sludge decreased with sonication time.
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