[en] The experimental investigation on the chemically activated local mineralmaterial of zeolite using H₂SO₄ with its various concentration of 0, 5, 10and 15 % and heating them by a furnace at the temperature of 100 - 400 ^oCfor evaluating their effectiveness on the immobilization of uranium wastewith the concentration of 100 ppm. Experimentally, this investigation is thefirst step of local mineral material usage as an alternative material for thetreatment of liquid waste containing radioactive element especially uranium.This investigation was performed by passing uranium solution feed with theconcentration of 100 ppm , pH=4 through the glass column containing activatedzeolite with the grain size of -100/+200, -80/+100 and -60/+80 mesh. Theexperimental resulted by maintaining the feed flow rate of 2.5 ml/min., pH=4obtaining the process condition in which uranium fraction contained in thezeolite column is given by DF_U = 70.Therefore, it could be concluded thatthe most effective activation was obtained with H₂SO₄ as an activationmaterial of the concentration = 5 %, for the zeolite grain size of -100/+200mesh and the saturating time gained for the zeolite grain size of -100/+200mesh = 3030 minutes. (author)