Outline
The present invention relates to the catalytic, wet disposal treatment of persistent, non-biodegradable oil refinery waste material flows, hazardous substances with high alkali, sulfide, polysulfide and mercaptan content, using an appropriate, combined, alternate-cycle operation method and a suitable catalyst composition such that wastewater material flow loaded with organic matter of a COD value greater than 150 000 mg O2/dm3 is remediated to such a degree at a lower pressure and temperature than industrial operation standard with a catalyst of high Ni content that the treated material flow may be treated in a biological wastewater treatment plant, the cleansed material flow thereof may be discharged into surface waters.