When the temperature of the wastewater treatment equipment decreases, the transfer of oxygen to the water gradually increases. Although the rate of biochemical reactions slows down, the impact on proteins, nucleic acids, and other components of the microbial tissue is relatively minor, and irreversible damage generally does not occur.

Compared to this, an increase in temperature, although detrimental to the transfer of oxygen into water, can accelerate the rate of biochemical reactions. However, due to the sensitivity of proteins and nucleic acids in biological cell tissues to temperature changes, irreversible damage can occur when the rate of temperature rise exceeds a certain limit, leading to a deterioration in wastewater treatment efficiency.

If the rate of temperature decrease in the wastewater treatment equipment slows down, the microorganisms in the activated sludge can gradually adapt to this change. At this point, measures such as reducing the load, increasing the oxygenation concentration, and extending the aeration time can achieve better treatment results.