For sedimentation, the addition of poly-electrolyte accelerate considerably the sedimentation process (2 to 3 days) compared to at least 20 days for temperatures above 16 C. The mechanical separation could not reduce sufficiently the dry matter content of the liquid fraction (1-2% lower compared to the effluent) to make this type of technology economically attractive. The separation system under the slats presented technical problems (brake down of the scraper, clogging of the urine outlet).The three separation systems showed disappointing results in this experiment. The performances obtained do not justify the investment costs of such systems.