An exhaust aftertreatment assembly includes a tubular conduit and a mixer. The tubular conduit has a central axis. The mixer is disposed in the tubular conduit. The mixer includes a first mixing plate and a second mixing plate. The first mixing plate is crescent shaped. The first mixing plate includes a first plate convex edge and a first plate concave edge. The first plate convex edge is attached to the tubular conduit. The first plate concave edge intersects the first plate convex edge at a first plate first point and a first plate second point. The second mixing plate is crescent shaped. The second mixing plate includes a second plate convex edge and a second plate concave edge. The second plate convex edge is attached to the tubular conduit. The second plate concave edge intersects the second plate convex edge.

An exhaust aftertreatment assembly includes a tubular conduit and a mixer. The tubular conduit has a central axis. The mixer is disposed in the tubular conduit. The mixer includes a first mixing plate and a second mixing plate. The first mixing plate is crescent shaped. The first mixing plate includes a first plate convex edge and a first plate concave edge. The first plate convex edge is attached to the tubular conduit. The first plate concave edge intersects the first plate convex edge at a first plate first point and a first plate second point. The second mixing plate is crescent shaped. The second mixing plate includes a second plate convex edge and a second plate concave edge. The second plate convex edge is attached to the tubular conduit. The second plate concave edge intersects the second plate convex edge.

An exhaust aftertreatment assembly includes a tubular conduit and a mixer disposed in the tubular conduit. The tubular conduit includes a central axis. The mixer includes a first mixing plate and a second mixing plate. The first mixing plate is crescent shaped and includes a first plate convex edge coupled to the tubular conduit, and a first plate concave edge. The second mixing plate is crescent shaped and includes a second plate convex edge coupled to the tubular conduit, and a second plate concave edge. The first mixing plate and the second mixing plate are positioned relative to the tubular conduit such that the central axis extends between the first plate concave edge and the second plate concave edge. A first plane in which the first mixing plate extends and a second plane in which the second mixing plate extends are oblique to the central axis of the tubular conduit.

A UV disinfectant system may include a chamber having a wall that is transparent to a disinfecting radiation. Liquid may be flowed through the chamber for treatment by exposure to the radiation. The chamber may include a static mixer having vanes to impede laminar flow of the liquid during treatment. The vanes extend into the flow path of the liquid through the chamber. A gap is defined between the vanes and the transparent wall. A cabinet may house the chamber and radiation emitting bulbs. Blowers may be operably coupled to a temperature sensor and flow meter and positioned at a lower end and upper end of the cabinet to urge air out of the cabinet. The temperature sensor may include a thermocouple. The blowers may be variable speed blowers. The system may include a controller to control system operations. The controller may be remotely accessible to monitor or control operations.

A UV disinfectant system may include a chamber having a wall that is transparent to a disinfecting radiation. Liquid may be flowed through the chamber for treatment by exposure to the radiation. The chamber may include a static mixer having vanes to impede laminar flow of the liquid during treatment. The vanes extend into the flow path of the liquid through the chamber. A gap is defined between the vanes and the transparent wall. A cabinet may house the chamber and radiation emitting bulbs. Blowers may be operably coupled to a temperature sensor and flow meter and positioned at a lower end and upper end of the cabinet to urge air out of the cabinet. The temperature sensor may include a thermocouple. The blowers may be variable speed blowers. The system may include a controller to control system operations. The controller may be remotely accessible to monitor or control operations.