<p>This study evaluates the feasibility of ultrasonic vibration as a non-destructive cleaning strategy for filter cloths fouled during the high-pressure dewatering of anaerobically digested sludge (ADS). Ferric sulfate was applied as a chemical conditioner, and an optimal dosage of 3,000&#xa0;mg L⁻¹ significantly enhanced filtration flux and filtrate yield during filter press operation. The regeneration performance of ultrasonic cleaning was compared with that of conventional high-pressure water cleaning. The results demonstrated that ultrasonic treatment restored up to 84% of the original air permeability, markedly outperforming water cleaning, without causing observable damage to the filter cloth. Scanning electron microscopy (SEM) analysis revealed effective removal of embedded foulants and partial recovery of the filter pore structure following ultrasonic cleaning. Although repeated filtration-cleaning cycles led to a gradual decline in air permeability, no apparent structural degradation of the filter cloth was detected. Overall, these findings indicate that ultrasonic cleaning is a promising and sustainable regeneration strategy for maintaining filter cloth performance in high-pressure ADS dewatering.</p> Graphical Abstract <p></p>