THE EFFECTIVENESS OF WATER COAGULATION TREATMENT WITH NON-PRESSURE MIXING BY AIR BUBBLES OF VARIOUS DISPERSION
Theoretical analysis of natural water hydropneumatic mixing process with a coagulant solution has shown that when polydisperse air bubbles pop up in the treated water column, local turbulent perturbations with a velocity gradient of up to 2500 s-1 and higher can be formed. The presence of local zones with increased values of the velocity gradient leads to a more uniform coagulant distribution in the mixer volume, speeding up the process of impurities coagulation and increasing the effect of subsequent water clarification by settling. It has been experimentally established that with hydropneumatic mixing, the maximum effect of natural water clarification treated with the coagulant is achieved when the ratio of fine and coarse air bubbles volumes is equal to 3:1, while the optimal doses of the coagulant can be reduced by 8-12 %.