In Bridge an image can be in multiple Collections but there is no way to see which collections an image is in. Also there is no way to remove an image from a collections unless you already know what collection it is in, and you have to open that collection first.

I would Bridge Collections to have the equivalent Remove from Album feature from Photoshop Elements Organizer, where I can right click an image, and select Remove from Album and then select from the albums that contain that image.