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Effects of the Co-treatment of Municipal Wastewater with Microwave-Irradiated Excess Sludge on the Performance of the Activated Sludge Process  

Kim, Nam-Chul (School of Environmental and Civil Engineering, Inha University)
Jang, Myung-Bae (School of Environmental and Civil Engineering, Inha University)
Cho, Yun-Kyung (Department of Civil Environmental Engineering, University of Wisconsin-Madison)
Cho, Kwang-Myeung (School of Environmental and Civil Engineering, Inha University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.3, 2007 , pp. 304-310 More about this Journal
Abstract
The purpose of this research was to investigate the effects of the co-treatment of municipal wastewater with microwave-irradiated excess sludge on the treatment efficiency and excess sludge production of the activated sludge process. When 250 mL of excess sludge with a MLSS concentration of approximately 2,000 mg/L was microwave-irradiated at $20^{\circ}C$ for $40\sim300$ sec by a microwave oven (2,450 MHz, 700 W), the temperature of the sludge increased at a rate of approximately $20^{\circ}C/min$ and the SCOD, TKN and T-P concentrations of the sludge showed the highest increase in the irradiation time of $40\sim130$ sec. And, the oxygen uptake rate measurement of the sludge microorganism suggested most of the microorganisms in the sludge were destroyed at an irradiation time above 130 sec(above $65^{\circ}C$). When the municipal wastewater and microwave-irradiated excess sludge was co-treated by the activated sludge process, almost no effect was observed in the pH and alkalinity of both the influent and effluent, but the influent concentrations of SS, COD, T-N and T-P increased. Even though the effluent SS, BOD and T-P concentrations showed almost no effect, the COD and TKN concentrations increased. The microbial yield coefficient decreased at a rate of 0.91 g SS/g COD removed as the irradiation ratio increased at a rate of 1 g SS/g SS-day.
Keywords
Microwave Irradiation; Activated Sludge Process; Sludge Minimization; Excess Sludge; Irradiation Ratio;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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