What is a technique to increase the interactions between coagulants and nonsettleable solids?

Increasing the flash mixer speed can enhance the interactions between coagulants and nonsettleable solids during the coagulation process. This technique is effective because higher mixing speeds promote better dispersion of coagulants throughout the water, allowing them to encounter and interact with target particles more efficiently.

When coagulants are mixed vigorously, they are able to collide with smaller nonsettleable solids, promoting agglomeration or clumping of these particles. This increased interaction leads to the formation of larger flocs that can more readily settle out of the water during subsequent treatment processes. In this way, increasing the flash mixer speed plays a crucial role in ensuring effective treatment of the water by enhancing the coagulation process.

The other options may influence the coagulation process but do not directly enhance the interactions between coagulants and nonsettleable solids in the manner that increased flash mixer speed does.