Search for: [Abstract = "Two cycles of tests were conducted, which implement the following amplitude A= 7.85 \[mikro\]m and 39.25 \[mikro\]m and the time of sonification ts = 30 ÷ 360s. The most beneficial effect of ultrasound treatment on the excess sludge was noted for the amplitude A=39.25 \[mikro\]m and the sonication time 360s, which resulted in 83.25% degree of disintegration of excess sludge. For these parameters, the strenght of ultrasonic wave was 4.8 W\/cm2."]