OXYGEN SUPPLY PERFORMANCE OF GAS-INDUCING AGITATOR SYSTEM FOR AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION PROCESS

ZHANG Min; TASHIRO Yu-kihiro; SAKAI Ken-ji

doi:10.13205/j.hjgc.202008002

Volume 38 Issue 8

Nov. 2020

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ZHANG Min, TASHIRO Yu-kihiro, SAKAI Ken-ji. OXYGEN SUPPLY PERFORMANCE OF GAS-INDUCING AGITATOR SYSTEM FOR AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 8-12. doi: 10.13205/j.hjgc.202008002

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ZHANG Min, TASHIRO Yu-kihiro, SAKAI Ken-ji. OXYGEN SUPPLY PERFORMANCE OF GAS-INDUCING AGITATOR SYSTEM FOR AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 8-12. doi: 10.13205/j.hjgc.202008002

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OXYGEN SUPPLY PERFORMANCE OF GAS-INDUCING AGITATOR SYSTEM FOR AUTOTHERMAL THERMOPHILIC AEROBIC DIGESTION PROCESS

doi: 10.13205/j.hjgc.202008002

Department of Bioscience and Biotechnology, Kyushu University, Fukuoka 819-0395, Japan

Received Date: 2020-04-03

Abstract

Abstract

Gas-inducing agitator system and disk turbine agitator system were applied to autothermal thermophilic aerobic digestion system; this study compared the oxygen supply performance and economic feasibility of these two agitator systems. The research showed that the gas-inducing agitator system was suitable for a stirring rate of 500~1100 r/min, a lower or higher stirring rate would affect the oxygen supply performance; with a stirring rate of 900 r/min and air flowrate of 0.5 L/min (by volume), the K_Lα value of the disk turbine agitator system was 108.01 h^-1, lower than that of gas-inducing agitator system of 124.52 h^-1; disk turbine agitator system under the same stirring rate and air flowrate, K_Lα value at 50 ℃ was greater than that of 30 ℃. To achieve the same K_Lα value under 1000 r/min, the power consumption of the gas-inducing agitator system was about 1/3 of that of the disk turbine agitator system.
- gas-inducing agitator,
- disk turbine agitator,
- overall volumetric oxygen transfer coefficient,
- autothermal thermophilic aerobic digestion,
- power consumption

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