A Study on BOD Removal Performance and Aeration Tank Management in Rural Sewerage Treatment Facilities with Intermittent Aerobic Suspended-Growth Processes

Abstract

From this research it is clear that ORP of first aeration tank in intermittent aerobic suspended-growth sewerage treatment facilities should be held in range of 100∼125 mV in order to ensure BOD removal performance, and DO behavior characteristics vary with operation condition such as types of diffused aeration devices, aeration intensity, and aeration time. K_La can be classified by types of diffused aeration devices, and it can be deduced from aeration intensity, temperature and MLSS of aeration tank mixed fluid, also, BOD reaction rate constant can be deduced from aeration intensity, aeration time and temperature of aeration tank mixed fluid. It is shown that operation efficiency of intermittent aerobic suspended-growth sewerage treatment facilities can be improved by choosing the recommend combination of aeration intensity (0.03 m³∙m^-3∙mim^-1) and aeration time (30 min) which is appropriate to the diffused aeration device, as the result, required BOD removal performance can be obtained with less consumption of air quantity.