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Table 1 Comparison of sludge reduction after ultrasonication pretreatment

From: Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Pretreatment Sludge reduction method Duration (days) Sludge reduction (%) Refs.
Alkaline-ultrasonic pretreatment Methane production 25 28.68 [11]
Ultrasonic pretreatment Anaerobic digestion 30 23.7 [28]
Ultrasonic and free nitrous acid pretreatment Hydrogen production 3 33.6 [33]
Alkaline-ultrasonic pretreatment Lysis-cryptic growth 12 56.5 [29]
Ultrasonication Aerobic digestion 3 40.2 [19]
Ultrasonication Lipid production 2 63.10 This study