Hydraulic retention time of shallow flotation machine

In the water treatment process, shallow flotation machine is an efficient separation equipment, and its operating parameters have a decisive influence on the treatment efficiency and effect of the whole system. Among them, hydraulic retention time is a key operating parameter of this equipment, which directly affects the removal rate of pollutants in water and the quality of treated water.
Hydraulic retention time (HRT) refers to the length of time that sewage stays in the shallow flotation machine. During this period of time, the suspended matter in the sewage will contact and adhere to the bubbles, then float to the surface of the water to form scum, and then be skimmed off. Generally speaking, increasing the hydraulic retention time can improve the removal rate of pollutants, because a longer time means more sufficient contact and adsorption between bubbles and suspended matter. However, too long a retention time may lead to a decrease in the treatment capacity of the equipment and increase investment and operating costs.
In actual operation, the hydraulic retention time is usually controlled within 3-5 minutes. This period of time is considered to be long enough to allow most pollutants to combine with bubbles and float up, and it is also an economically reasonable length of time. In addition, the hydraulic retention time is closely related to other design parameters of the equipment, such as pool depth, water distribution mechanism design and other factors, which need to be considered comprehensively to ensure good treatment effects.