A Study on the Characteristics of Wastewater Treatment by the Intermittently Aerated Fluidized Bed

The charateristics of wastewate treatment of the fluidized bed filled with sand media and intermittently aerated were studied experimentally, and the obtained results were as follows; 1. The minimum available DO level for microbial metabolism is lower in the intermittently aerated fluidized bed than in the continuously aerated bed, and this can be resulted in the increased BOD removal. 2. In the intermittent aeration system, the microorganisms uptake more oxygen in the early times of aeration than in the other times. 3. Unlike the case of continuous aeration, the extension of bed height lead to the greatly improved BOD removal rate in the intermittent aeration. 4. The time rate of non-aeration/aeration must be operated below maximum 0.75, under the BOD loading rate of it must be operated below maximum 0.7 for the standard of water quality namely influent BOD 20 mg/l. 5. In intermittent aeration the energy consuption rate for circulation can be decreased greatly to 67.5% from 73.3%. and for aeration to 59% from 66. 7%.