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This paper mainly discussed the oxygen transfer efficiency and economic cost of aeration system in one of Wastewater Treatment Plant (WWTP) in Shandong province. The Standard Oxygen Transfer Rate (SOTR) of new and old aerator of aeration system in this WWTP was studied in this paper firstly. The results show that the SOTR of the older aerator were reduced obviously, and the reason of this phenomenon is that the micro-porous in the membrane has damaged and blocked. The cost analysis of the aeration system combining with the actual operation of this WWTP was also studied, conclusions were got that 0.9 million Yuan can be saved each year after replace the old aerator which has already run more than 10 years. Furthermore, this replacement can recovery its cost after only 14 months

The oxygen transfer efficiency and economic cost analysis of aeration system in municipal wastewater treatment plant