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Development of a high-efficiency rotary dryer for sewage sludge

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Abstract

A rotary drum dryer having an internal rotating body was designed and tested in this study. It was shown that the developed dryer is effective for drying sewage sludge. The best operating conditions in the dryer were low energy input and almost 10% moisture content. The conditions are 255°C for the rotary drum temperature, 17 min for the sludge residence time, and 55 kg/m3 h for the dryer load. Under these conditions, the drying efficiency was 84.8%. The average diameter of dried sludge was less than 8 mm, and the weight reduction rate was 80%. Parametric screening studies achieved the following results. The drying efficiency increased with the increase of the internal temperature and the sludge residence time in the rotary drum, while the drying efficiency decreased when increasing the dryer load. In addition, it was shown that NH3 and CO2 were the primary components released from the sewage sludge drying process. The amounts of both of these components increased when the rotary drum temperature was increased.

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Authors and Affiliations

  1. BK21 Team for Hydrogen Production, Department of Environmental Engineering, College of Engineering, Chosun University, 375, Seosuk-dong, Dong-gu, Gwangju, 501-759, Republic of Korea

    Young Nam Chun & Mun Sup Lim

  2. Frontier Research Center, Tokyo Institute of Technology, G5-8, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan

    Kunio Yoshikawa

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  1. Young Nam Chun
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  2. Mun Sup Lim
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  3. Kunio Yoshikawa
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Correspondence to Young Nam Chun.

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Chun, Y.N., Lim, M.S. & Yoshikawa, K. Development of a high-efficiency rotary dryer for sewage sludge. J Mater Cycles Waste Manag 14, 65–73 (2012). https://doi.org/10.1007/s10163-012-0040-6

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  • DOI: https://doi.org/10.1007/s10163-012-0040-6

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