Effect on solids separation from wastewater with varying aeration and mixing conditions

Abstract

The main objective of this review was to analyze the effect on the separation of solids from wastewater with different conditions of aeration and mixing in order to compare their efficiency when both processes act simultaneously and find the most optimal conditions among the various variables. Due to the effectiveness of a new additive provided by the company Norwegian Technology AS whose use in new experimental methods is being evaluated, it was decided to analyze its effectiveness of removal of total suspended solids and turbidity under different experimental conditions. Therefore, different variables were taken into account in the study: the use of different diffusers, the effect of different impellers, the result in the variation of mixing velocity and the response of solids to different designs of mixing tanks. Obtaining that the design of the experimentation tank plays an important role in the results, when mixing and aeration act together, being in this case the 3-liter tank with a speed of 1200 RPM at a concentration of 2.75 g of N-sep per liter of water, with a pitched-blade impeller being the best conditions in all the experimentation processes obtaining a 92 – 96 % TSS removal and a turbidity range bewteen 5 – 9 FAU. To conclude it was founded that sintered tone diffuser has the best results for the two proposed tested tanks with a percentage removal of TSS between 85 - 95% in both tanks.