Photofinishing effluent purifying process and apparatus

Abstract From the Canadian patent

The invention provides a process and apparatus for on-site purification of photofinishing effluent produced by mini-lab photofinishing apparatus and the like. The process includes passing the effluent through an adsorbent to adsorb inorganic and organic compounds to produce a primary filtrate fluid. The primary filtrate fluid is directed to a membrane filter which in turn discharges relatively clean permeate fluid which passes through the membrane filter as a secondary filtrate fluid and rejects concentrate fluid that does not pass through the membrane filter. Preferably the effluent is passed through a plurality of adsorbents of which at least one adsorbent adsorbs inorganic compounds and …