Yan, Yixin Protein extraction and sludge dewatering performance of ultrasound-assisted enzymatic hydrolysis of excess sludge. [electronic resource] - Environmental science and pollution research international May 2020 - 18317-18328 p. digital Publication Type: Journal Article ISSN: 1614-7499 Standard No.: 10.1007/s11356-020-08208-2 doi Subjects--Topical Terms: HydrolysisProteinsSewageTemperature