Fluid mixing systems with modular impellers and related methods

A mixing system for mixing a liquid, comprising:

• a first impeller segment comprising a first mount, a first mixing blade of the first impeller segment secured to the first mount, and a second mixing blade of the first impeller segment secured to the first mount, the first mixing blade of the first impeller segment being spaced apart from the second mixing blade of the first impeller segment;
• a second impeller segment comprising a second mount and a first mixing blade of the second impeller segment secured to the second mount, the second impeller segment being separate and discrete from the first impeller segment;
• a third impeller segment comprising a third mount and a first mixing blade of the third impeller segment, the third impeller segment being separate and discrete from the first impeller segment and the second impeller segment;
• and
• an elongated first drive member, the mount of the first impeller segment, the mount of the second impeller segment, and the mount of the third impeller segment being secured directly to the first drive member such that a plane intersects with the first mixing blade of the first impeller segment, the second mixing blade of the first impeller segment and also with the first mixing blade of the second impeller segment, and the first mixing blade of the third impeller segment,
• wherein the first mount, the second mount, and the third mount each comprise an opening through which the elongated first drive member passes.

A mixing system for mixing a liquid, comprising:

• a first impeller segment comprising a first mount and only two mixing blades or only one mixing blade being secured to the first mount;
• a second impeller segment comprising a second mount and only two mixing blades or only one mixing blade being secured to the second mount, the second impeller segment being separate and discrete from the first impeller segment;
• a third impeller segment comprising a third mount and only two mixing blades or only one mixing blade being secured to the third mount, the third impeller segment being separate and discrete from the first impeller segment and the second impeller segment;
• an elongated first drive member directly secured to the mount of the first impeller segment and/or the mount of the second impeller segment and/or the mount of the third impeller segment;
• and
• a collapsible, flexible bag having a compartment and being comprised of one or more sheets of polymeric film, the first impeller segment, the second impeller segment, the third impeller segment, and at least a portion of the elongated first drive member being disposed within the compartment of the flexible bag,
• wherein the first mount, the second mount, and the third mount each comprise an opening through which the elongated first drive member passes.