The current work describes a novel application of steam reforming process to treat palm oil mill effluent (POME), whilst co-generating H-2-rich syngas from the treatment itself. The effects of reaction temperature, partial pressure of POME and gas-hourly-space-velocity (GHSV) were determined. High crystallinity 20 wt%Ni/80 wt%Al2O3 catalyst with smooth surface was prepared via impregnation method. Baseline runs revealed that the prepared catalyst was highly effective in destructing organic compounds, with a two-fold enhancement observed in the presence of 20 wt% Ni/80 wt%Al2O3 catalyst, despite its low specific surface area (2.09 m(2) g(-1)). In addition, both the temperature and partial pressure of POME abet the COD reduction. Consequently, the highest COD reduction of 99.7% was achieved, with a final COD level of 73 +/- 5 ppm from 27,500 ppm, at GHSV of 40,000 mL/h.g(cat) and partial pressure of POME equivalent to 95 kPa at 1173 K. In terms of gaseous products, H-2 was found to be the major component, with selectivity ranged 51.0% -70.9%, followed by CO2 (17.7%-34.1%), CO (7.7%-18.4%) and some CH4 (0.6%-3.3%). Furthermore, quadratic models with high R-2-values were developed. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.