“…1,4 Other study showed resemblance of isolated microorganism from natural oil sludge habitat to the genus Bacillus 30 although, further confirmatory tests are still required to support similarity. 1,24 However, the effect of such consortia on hydrocarbon degradation estimated by measuring TPH removal rate was reported 1,4,30 There are still other factors to be considered for better degradation rate such as toxicity which has significant role on biodegradation 1,2 and on TPH % removal. 3,4,27,30 Conclusion Several reviews showed that the significant of Consortia type and concentration for better biodegradation rate of Oil sludge contamination.…”