Is your booth directly connected to the drain or bucket?
If it is directly connected, a simple metal drain catcher will work just like your kitchen sink). If you are using a bucket, the first concept works, but you can also place a mesh screen on top of the bucket (this will catch most of the emulsion) as it drips down into the bucket.
If it is directly connected, a simple metal drain catcher will work just like your kitchen sink). If you are using a bucket, the first concept works, but you can also place a mesh screen on top of the bucket (this will catch most of the emulsion) as it drips down into the bucket.