这可能是因为在刚开始进水时，曝气池内温度、溶解氧量均较低，此时小球内富

This may be because the temperature and dissolved oxygen in the aeration tank were both low at the beginning of the water intake. At this time, the bacteria enriched in the pellets have just gone through a quiet period of 1.5 hours, and the metabolic activity has not been restored in time. When the aeration is over, the dissolved oxygen content gradually increases, the temperature also slightly increases, and the bacterial metabolic activity in the pellet gradually recovers, so the light refractive index increases. With the aeration process for 1 hour, the microbial metabolic reproduction is in a stable stage At this time, the optical refractive index of the pellets will change with the changes of the dissolved oxygen concentration and the sludge concentration in the system. During the aeration, the light refractive index of the pellets, to the detection of the fourth stage of the precipitation decanting period, the temperature is stable, the dissolved oxygen in the aeration tank gradually decreases, and the metabolic activity of the pellets also decreases at this time.

This may be because at the beginning of water inflow, the temperature and dissolved oxygen in the aeration tank are low. At this time, the bacteria enriched in the pellets have just experienced a quiet stage of 1.5h, and the metabolic activity has not recovered in time. When the water inflow is over and aeration is started, the dissolved oxygen content gradually increases, the temperature also increases slightly, and the metabolic activity of bacteria in the pellets gradually recovers, so the optical refractive index increases, With the aeration process for 1h, the microbial metabolism and reproduction has been in a stable stage. At this time, the light refractive index of the small ball will change with the change of dissolved oxygen concentration and sludge concentration in the system, which may be higher than the light refractive index of the small ball at the beginning of aeration, or equal to or even lower than the light refractive index of the small ball at the beginning of aeration. When the fourth stage precipitation decanting period is detected, When the temperature is stable, the dissolved oxygen in the aeration tank gradually decreases, and the metabolic activity of pellets also decreases.<br>

This may be because the temperature and dissolved oxygen in the aeration tank were low at the beginning of water inflow. At this time, the bacteria enriched in the pellets had just experienced a quiet stage of 1.5h, and their metabolic activity was not recovered in time. When the water inflow ended, aeration began, the dissolved oxygen content gradually increased, the temperature also increased slightly, and the metabolic activity of bacteria in the pellets gradually recovered, so the light refractive index increased. As the aeration process went on for 1h, the metabolism and reproduction of microorganisms were in a stable stage. At this time, the light refractive index of pellets will change with the change of dissolved oxygen concentration and sludge concentration in the system, which may be higher than or even lower than that at the beginning of aeration. By the time of the fourth stage of detection, the temperature is stable, the dissolved oxygen amount in the aeration tank decreases gradually, and the metabolic activity of pellets also decreases.