低温条件下活性污泥呼吸图谱特征变化

he changes of effluent water quality and activated sludge respirogram were studied during the process of temperature reduction by simulating the low temperature condition of the sewage plant.The results showed that the critical temperature for the removal of organic matter and nitrogen removal efficiency were 10℃and 8℃,respectively.The system is restored to the original temperature operation after a brief low temperature impact,and microbial activity and sewage treatment capacity can also be quickly restored. The field conditional respirogram pattern reflects the activity of microorganisms in the field conditions, which can be used to characterize the sewage treatment capacity of activated sludge microorganisms. The decrease of temperature leads to the decrease of the field conditional OUR, which leads to the decrease of the sewage treatment capacity. The standard condition respirogram reflects the intrinsic characteristics of activated sludge microorganisms. In the process of the temperature from 20 ℃ down to 10 ℃, the standard condition OUR basically remained stable. The results indicated that the intrinsic activity of the microorganisms remained stable at this stage,and the increasing the reactor temperature at this time allows the microbial activity and wastewater treatment capacity to be recovered quickly. By comparing the field and standard condition respirogram, it can provide some theoretical reference for the operation of the sewage treatment plant in winter.