Context:

To evaluate the efficiency of a commercial cationic polyelectrolyte as a coagulant in the treatment of ARILs.

Methodology:

To make the assembly of the jar tests of 1L of sample of ARI, it was used a cationic polyelectrolyte as coagulant. Each of the test was made under conditions of fast mixture at 150 rpm (during 1 minute), slow mixture of 30 rpm (25 minutes) and resting time (30 minutes).

Results:

there were made jar tests, using dose of coagulant of 100, 140, 180, and 260 mg/L, getting removal efficiency of Oils and Fats (O and F), OSH, COD and Turbidity with the use of the coagulant, between 27% - 62%, 57%-89%, 8%-58%,and 26%-88% respectively. The Best concentration was the one of 140mg/L.

Conclusions:

It was conclude that the commercial cationic polyelectrolyte used as a pretreatment of coagulation constitute an alternative to improve the removal of O and F in the dissolved air flotation unit (DAF) from the wastewater treatment system of the dairy industry.