As matter of fact, I am working on the project to design a preliminary wastewater treatment for industrial factory's such as manufacturer of dairy products.
Fenton's treatment followed by lime coagulation is the best effective method for this kind of wastewater. You just need FeSO4, 7H2O and H2O2. Adding UV light will enhance the reaction rate. ferrous sulfate itself is a coagulant but use of lime will definitely improve the the quality of the treatment.