The effect of packing in the biofilm reactor mainly has the following three aspects:
The main effect of the packing is to contain attached microorganisms, which is the carrier for the growth of microorganisms, and provides a stable environment for microorganisms to rest and multiply. Its rich internal and external surfaces provide external and internal space for microorganisms to adhere to, so that the reactor can maintain as much as possible The microbial biomass. Generally speaking, the larger the filler surface area, the more microorganisms attached, and the higher the acceptable organic load.
The filler is the place where the biofilm and the wastewater in the reactor come into contact, and it has a mandatory turbulence effect on the water flow, so that the water flow can be scattered from the beginning and change its moving direction, so that the water flow spreads more evenly on the cross section of the reactor. At the same time, the water flow forms interspersed activity mixing inside the filler, creating good hydraulic conditions for the contact between wastewater and organisms. Moreover, the filler has a repeated cutting effect on the bubbles in the aerobic reactor, which increases the dissolved oxygen concentration in the water, thereby enhancing the mass transfer between microorganisms, organisms and dissolved oxygen.
The filler has a certain retention effect on suspended solids in the water. Because there are fillers in the reactor, the concentration of suspended solids in the effluent is greatly reduced. The interception effect of the fillers on suspended solids is accomplished by blocking, depositing, inertia, dispersion, and hydrodynamics of the suspended solids in the sewage.