Crude wastewater generated in 2 tripes-processing plants were treated by air-dispersed and HA-assisted flotations, coagulated with lime milk and flocculated. The tests were performed at temps. below 25 degrees C and above 55 degrees C and after cooling down below 40 degrees C. Chem. and biochem. O-2 demand, pH, total suspended solids and ether extract, as well as P and N contents in the wastewater were detd. The best results were achieved after the coagulation and H2O2-assisted flotation.