Material production always is the main pollution resource, particularly pulping (PI) and textile industries (TI). Among all pollution abatement technologies wet air oxidation (WAO) is a promising alternative. In the one hand it can be applied as an in-plant measure to mineralize organics in wastewater (WW), therefore remained inorganic chemicals can be recovered and/or reused, on the other hand it can also be used as a WW pretreatment before popular biological treatment to get discharge demands. The best, and may be the most economical way to widen application of conventional WAO process is application of catalysts. Conventional oxidation catalysts contain precious metals, they also require stable to hydrothermal conditions supporting materials that bring additional high cost. The utilization of solid wastes (SW) from some industries for catalysts production can get multi-purpose goal: in one side reduction of SW in some industries, in the other side their use in CWO can reduce pollution in the other industries. Besides, due to low pressure and temperature required it can make application of WAO much easier and widened. With pretreatment prior to biological treatment purpose it can partially degrade persistent and toxic compounds that make following biological treatment more efficient. First application trials of CWO were made with black liquor from PI and dyeing WW from TI showed possibility of such idea. ]