“…Thus, until latterly these compositions were thought to be hugely microorganism inefficient in the absence of oxygen, nitrate and sulfate. Due to the potential significance of methanogenic petroleum biological degradation, the limited knowledge of the microorganisms involved and of the techniques by which compositions of petroleum are degraded, it is significant that we know what rules the microorganism transformation of crude oil to methane [7], [8]. In this paper, results of investigating the comparison removal efficiency of crude oil from Tigris river water (TW) and sea water (SW) samples in one phase bioreactor and two-liquid phase partitioning bioreactor (TLPPB).…”