| Effect of Temperature-increase Rate and Terminal Temperature on the
Solubilization of Sewage Sludge using Microwave Irradiation |
| Woon-Ji Park, Johng-Hwa Ahn†, and Chan-Ki Lee |
| Division of Environmental and Geosystem Engineering, College of Engineering, Kangwon National University, Hyoja 2-Dong, Chuncheon, Kangwon 200-701, South Korea |
Corresponding Author:
Johng-Hwa Ahn ,Tel: +82-33-250-6357, Fax: +82-33-254-6357, Email: johnghwa@kangwon.ac.kr
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Received: November 7, 2008; Accepted: February 9, 2009. |
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| ABSTRACT |
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Solubilization of sewage sludge creates favorable conditions for anaerobic microorganisms to produce biogas. In this paper, we quantify the
effect of heating pretreatment on the degree of solubilization of sewage sludge. The pretreatment process was carried out using a lab-scale industrial
microwave unit (2450 MHz frequency). Response surface analysis was applied to determine the combination of temperature-increase rate (ramp
rate) (2.9 to 17.1 °C/min) and terminal temperature (52 to 108°C). Both ramp rate and temperature significantly affected the solubilization degree of
sludge. Within the design boundaries, the conditions predicted to maximize the solubilization degree of 15.8% were determined to be 2.9 °C/min
and 104°C. |
| Keywords:
Anaerobic digestion | Central composite design | Optimization | Pretreatment | Response surface analysis |
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