HYDRODYNAMICS AND OXYGEN-TRANSFER CHARACTERISTICS IN ACTIVATED-SLUDGE AERATION TANKS

被引：4
|
作者：
FUJIE, K
URANO, K
KUBOTA, H
KASAKURA, T
机构：
[1] TOKYO INST TECHNOL,MIDORI KU,YOKOHAMA 240,JAPAN
[2] NGK INSULATORS LTD,MIZUHO KU,NAGOYA 467,JAPAN
来源：
WATER SCIENCE AND TECHNOLOGY | 1992年 / 26卷 / 3-4期
关键词：
ACTIVATED SLUDGE PROCESS; AERATION; SPIRAL LIQUID CIRCULATION; OXYGEN TRANSFER RESISTANCE; OXYGEN EXCHANGE RESISTANCE; BUBBLE RISING VELOCITY; VOLUMETRIC OXYGEN TRANSFER COEFFICIENT;
D O I：
10.2166/wst.1992.0460
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Spiral liquid circulation rate in the conventional aeration tank was investigated based upon the theoretical development of the hydrodynamics and the experimental observation. The effect of liquid circulation rate on the gas-liquid oxygen transfer and the oxygen exchange between the bubbling zone and the bubble-free zone in the aeration tank were clarified. The spiral liquid circulation rate at the liquid surface in the aeration tank was correlated as functions of the superficial gas feed rate, the diffuser depth and the bubble diameter generated from the air diffusers. The oxygen exchange resistance between the bubbling zone and the bubble-free zone was 3 - 5 % compared to the overall oxygen transfer resistance from the atmosphere to the bubble-free zone, while that in the deep aeration tank was significant. It was also clarified that the higher spiral liquid circulation rate increases the bubble ascending velocity and thus hinders the gas-liquid oxygen transfer.
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页码：791 / 800
页数：10
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