Principle of PFR aerobic process

the PFR aerobic process you mentioned is actually the traditional activated sludge process, namely Plug-Flow Reactor. The aeration tank is rectangular, and the mixed liquid flow is plug flow. Sewage and returned sludge enter from the head end of the aeration tank together. Under the impetus of aeration and hydraulic conditions, the mixed liquid flows backward evenly and is finally discharged from the tail end. The organic pollutants in the mixed solution come into contact with the microorganisms during the flowing process, and undergo adsorption, biological oxidation, biosynthesis, etc., and gradually transform into stable small molecular substances, and their concentrations are significantly reduced, so that microorganisms can proliferate.

advantages: good treatment effect, suitable for treating sewage with high purification and stability; Can flexibly adjust the level of sewage treatment; When the influent load increases, it can be solved by increasing the sludge reflux ratio.

Disadvantages: the pool has a large volume, covers a large area, and costs a lot of capital construction; The organic load of influent should not be too high, otherwise it will cause anoxia or anaerobic state, so the load is low; The oxygen supply at the front end of the pool is insufficient, and the oxygen supply rate may be higher than the aerobic rate at the end of the pool, which leads to high power consumption; Poor adaptability to impact load.