Abstract
This study investigated the effects of the heating rate on the simultaneous production of gas and inorganic phosphorus (IP) from palm oil mill effluent in supercritical water (600 °C, 25 MPa). The heating rate was controlled by modulating the preheater lengths (1, 2, and 4 m) and flow rates (2 and 3 g/min). Faster heating rates were obtained using shorter-length preheaters, even at identical flow rates. Although the increased heating rate resulted in a higher carbon gasification efficiency and lower hydrogen content, it also reduced the amount of precipitated IP. As the effect of flow rate, which determined the residence time in the reactor, was much smaller than that of the heating rate, it can be concluded that the primary reactions of this process are completed in the preheater. This finding can help to guide the optimization of the POME recycling process.
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