Study of the Performance of the Biological and Microbiological Treatment of Domestic Wastewater by Biological Aerated Filters with Packed Media

The objective of this study is to study the performance of biological and microbiological treatment of domestic wastewater by two aerated biological reactors (R1 and R2), having the same characteristics and operating in batch mode. They are filled with plastic packing media of the same type but of different sizes. Therefore, four (4) adaptation tests were carried out. Successful results have been obtained in Chemical Oxygen Demand (DCO), turbidity, and microbiology. The abatement rate of these parameters got improved during the adaptations. So is for the dissolved oxygen and the pH which increases in each of the tests, as for the conductivity, it varied very slightly in all the tests denoting the important role of the acclimation of the bacteria in the elimination of the pollutants of wastewater. The results of the various pollution parameters are generally more benefit the R1 bioreactor filled with small plastic packing media. This is due to the possibility offered by this plastic packing media to favor its colonization by larger fixed biomass. These tests lead to the conclusion that biological treatment by the aerated biological filter is very effective in the elimination of the main pollutants of domestic wastewater: COD, turbidity and fecal pollution.