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The study of waste activated sludge (WAS) solubilization has been increased for sludge volume reduction and enhancing the efficiency of anaerobic digestion. Microwave (MW)-assisted solubilization is an effective method for the solubilization of WAS because this method can lead to thermal, nonthermal effect and ionic conduction by dielectric heating. In this study, the solubilization of WAS by MW heating and conductive heating (CH) was compared and to enhance the MW-assisted solubilization of WAS at low MW output power, chemical agents were applied such as H2SO4 as the strong acid and CaCl2, NaCl as the ionic materials. Compared to the COD solubilization of WAS by CH, that by MW heating was approximately 1.4, 6.2 times higher at 50°C, 100 °C, respectively and the highest COD solubilization of WAS was 10.0% in this study of low MW output power condition. At the same MW output power and reaction time in chemically agents assisted experiments, the COD solubilization of WAS were increased up to 18.1% and 12.7% with the addition of H2SO4 and NaCl, however, that with the addition of CaCl2 was 10.7%. This result might be due to the fact that the precipitation reaction occurred by calcium ion (Ca) and phosphate ion (PO4) produced in WAS after MW-assisted solubilization. In this study, H2SO4 turned out to be the optimal agent for the enhancement of MW efficiency, the addition of 0.2 M H2SO4 was the most effective condition for MW-assisted WAS solubilization.

The Effect of Strong Acid and Ionic Material Addition in the Microwave-assisted Solubilization of Waste Activated Sludge