This paper reviewed five (5) researches on industrial wastewater treatment processes, the methods employed in these researches are aerobic, anaerobic or the combination of both methods. The paper tried to briefly discuss the motives of the researchers, their instrumentations and results. These researches include a combined anaerobic-aerobic system for treatment of textile wastewater conducted in Malaysia (2007) by Mahdi et al., Fayza et al., in 2004 conducted a research on chemical industrial wastewater treatment, a preliminary study on nitrogen and organic removal efficiency of a lab-scale system using aerobic and an-aerobic reactors by Florante et al., in 2009, a research on Wastewaters from olive mills and pulp and paper mill industries in Jordan conducted by Bashaar in 2004 and a survey on wastewater treatment plants in the Slovak Repulic by Gašpariková et al., in 2004