We used to fit these for commercial minilabs, in the UK. They aren't expensive. We only fitted them in basements when the drains were at a higher level. Basically we installed silver recovery units, and then all the waste dev, de-silvered bleach-fix & fixer, & wash water were mixed in a tank and pumped to drainb using a sump pump. (Of course we had obtained water board permissions).
You need a tank, a hot water header tank is perfect, the pumps come with their own float switch and are enough to pump nahead of about 10 -15 ft. I can't remember what make we used but Grunfloss seems vaguely right. I'll do a search for you.
Ian