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This work aimed at understanding the combined effect of sludge pH, temperature, and external pressure on the efficiency of sewage sludge ultrasound (US) pretreatment. Based on the evolution of both the degree of sludge disintegration (DD COD ) and pH, application of 40 mg NaOH /g TS during 30 min was selected for chemical pretreatment. Mechanical and thermal effects induced...
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