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 |