Abstract: A system for mixing a fluid in a tank includes a set of mixers and a controller. The set of mixers is disposed proximal to a perimeter of the tank. The set of mixers are operable to pivot. The controller is configured to control the set of mixers to pivot from a first orientation to a second orientation. The controller is configured to control each mixer of the set of mixers to stop pivoting in a first direction in response to each respective mixer achieving a predetermined intermediate orientation and the controller is configured to control the set of mixers to continue pivoting in the first direction in response to all mixers of the set of mixers achieving the predetermined intermediate orientation.

Abstract: An embodiment of the invention includes a cylindrical settler having a longitudinal axis, a conical base centered on the longitudinal axis, a outer wall centered on the longitudinal axis, a mix tank centered on the longitudinal axis and within the outer wall, and a coalescence fence extending from the outer surface of the mix tank.

Abstract: An embodiment of the invention includes a trapezoid settler having a longitudinal axis, a base, a first side wall oriented at an angle to the longitudinal axis, a second side wall opposing the first side wall and oriented at an angle to the longitudinal axis, and a coalescence fence connected to the first side wall and the second side wall. The coalescence fence has a first screen, a second screen oriented generally parallel to the first screen, and a media disposed between the first screen and the second screen.