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The amount of excess sludge production from wastewater treatment plants is continuously increasing. Therefore, minimization of excess sludge is becoming increasingly important. The aim of bacterial cell disintegration is the release of the cell contents as an aqueous extract. This accelerates the cell hydrolysis that is usually considered to be the rate-limiting step in the sludge stabilization. Vacuum disintegration can activate the biological hydrolysis process and therefore, significantly increase the stabilization rate of the secondary sludge. It has been shown that when subjecting the sludge to 30 min of vacuuming, the COD concentration in the supernatant increased from 120 mg/L to more than 300 mg/L. Sodium dodecyl sulfate surfactant and lime have been used in different concentrations to enhance the hydrolysis process. The results show an additional increase in the supernatant COD concentration. For disintegrated excess sludge, an improved and accelerated anaerobic digestion is detected. The digestion process is characterized by higher degradation with increased disintegration.

Improvement of Anaerobic Sludge Digestion by Disintegration of Activated Sludge using Vacuum Process