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In this study, ultrasonic disintegration (UD) was used on excess sludge during the anaerobic degradation (AD) process to improve treatment efficiency. After applying AD for 7 days followed by UD for 15 min, soluble chemical oxygen demand (SCOD) concentration reached 4320.5 mgL−1; this was 1.6 times when UD was applied alone for the same treatment time. Intermittent UD during the AD process was more...
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