Table 2 Summary of experimental results of sludge solubilization due to ultrasonification.

Sludge	Time(min)	Specific energy input (kJ/g TS)	Solubilization(%)	Increasing rate(min-1)
Dairy	30	1.7	5.9	0.0220(y=0.0220x+0.31)
	60		8.7
	90		14.5
	30	1.2	1.9	0.0216(y=0.0216x+0.03)
	60		5.6
	90		12.1
Live-stock	30	1.7	3.6	0.0197(y=0.0197x+0.20)
	60		8
	90		10.6
	30	1.2	1.4	0.0181(y=0.0181x+0.01)
	60		4.2
	90		8.6