1 Effect of output power, target temperature, and solid concentration on the solubilization of waste activated sludge using microwave irradiation Graduate Student : Wei-Ting Lin Advisor : Ming-Chien Hsiao

2  Introduction  Materials and methods  Results and discussion  Conclusions

3 Introduction  The processing and disposal of waste activated sludge is one of the most important and complex problems in the operation of municipal wastewater treatment plants.  Such disintegration may be performed mechanically, ultrasonically, chemically, or thermally.

4 Introduction  Microwaves are used in many and varied applications, including organic decomposition, the sterilization of medical waste, and the inactivation of microorganisms in foods, animal manure, and soil.  The advantages of microwaves in these applications include rapid heating, pathogen destruction, ease of control, compactness, and low overall cost.

5 Introduction  Therefore, the objective of this study is to investigate the effects of microwave irradiation on solubilization of waste activated sludge.

6 Materials and methods

7 Results and discussion

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10 Results and discussion

11 Conclusions  RSA was successfully applied to determine the effects of output power, target temperature, and TS concentration on the solubilization degree of waste activated sludge and to estimate the response surface describing the solubilization degree to changes in these variables.

12 Conclusions  Within the design boundaries, maximum solubilization degree occurred at an output power of 400 W, a target temperature of 102 ℃, and a TS concentration of 2.3%.

13 Thanks for your attention