Environment Research Academy;
State Key Laboratory of Regional Optimisation of Energy System;
North China Electric Power University;
Belting 102206;
P. R. China;
State Key Laboratory of Environmental Criteria and Risk Assessment;
Chinese Research Academy of Environmental Sciences;
Beijing 100012;
P. R. China;
Estrogen; Biodegradafion; Rhamnolipid; Ultrasonic-assistance; Quantitative; structure-biodegradation; rela-tionship(QSBR);