Construction and Calibration of Physical Filtration Equation of Biological Aerated Filter

Abstract

To establish the physical filtration equation of Biological Aerated Filter (BAF), the porosity calculating model (Eq. 5) and SS concentration calculating model (Eq. 16) were constructed respectively by the way of infinitesimal element analysis. And then the BAF physical filtration equation had been derived by using the relationship among headloss, porosity and SS. The BAF physical filtration equation was shown as Eq. 19.Then the Kozeny-Carman coefficient in Eq. 19, kc, was confirmed to be 0.040 by experimental adjusting and domesticating. In the condition of kc=0.040, the predicted values of Eq. 19 fitted the experimental values of BAF reactor well, which illustrated that the BAF filtration equation constructed in this study was scientific and the parameters value adopted in this equation was reasonable.