P-14 超臨界水中におけるパーム油工場排水(POME)からのリンの回収

抄録

The amount of liquid waste from palm oil production in Indonesia is increasing every year as the production capacity increases. Phosphorus in palm oil mill effluent (POME) could be the important potential phosphorus resource, considering the depletion of phosphate rock due to over exploitation. Supercritical water gasification (SCWG) technology could convert POME into valuable gas coming along with phosphorus recovery. To acquire a good understanding about behavior of POME conversion in SCWG, a set of experiments were developed. Here, variation of temperature (500-600 °C) and residence time (5-50 s) with controlled pressure at 25 MPa were employed in a continuous reactor. A reaction model of conversion of organic phosphorus in POME to inorganic phosphorus was also proposed. As the results, the organic phosphor could be converted into inorganic phosphorus and precipitation took place in the reactor. The rate was faster at higher temperature. The reaction followed first order kinetics, and the model was found to fit well with experimental data.