Blast aeration is one of the energy-consuming facilities in wastewater treatment unit.Traditional aeration systems have the characteristics of over aeration,delayed aeration,large fluctuations in dissolved oxygen(DO).A multi-stage AO main process is implemented for a wastewater treatment plant(WWTP)in Suzhou,supplemented by a precise aeration system.The results show that after nearly a year of debugging and operation,DO tends to stabilize under the precise aeration control system.From the automatic control of blower gas supply to main pipe gas distribution,DO in each section of the reaction tank is stably controlled,with a stability degree of D5 ranging from 94%to 99%.Electricity consumption per unit of water is 0.37 kW·h/m3,which saves more than 10%of energy compared to the original WWTP.The synchronous application of"photovoltaic+water management"in WWTP has achieved good carbon emission reduction effects of electricity generation and energy conservation,with the goal of energy conservation and emission reduction in the urban wastewater treatment industry.
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