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Background and objective: Hydrocarbon compounds from the drilling fluid and the formations containing these compounds enter into the drill cuttings. Toxicity​and complex nature of this type of pollution causes environmental pollution and it can be dangerouse for human health. The objective of this paper was survey of biological wastewater sludge biocompost for organizing and disinfecting of khuzestan oil field drill cutting.

Methods: In this study, the effect of a mixture of biological sludge and drill cuttings containing TPH with a 1:1 ratio, along with sawdust and horticultural waste was examined in order to do biocompost processes. The degradation time in this study was nearly 60 days in pilot chamber, and in addition to the TPH, the pH, volatile solids, C/N and temperature levels were measured, and eall tests conducted as triplicate. Statistical Studies were done in EXCEL and SPSS software with significant confidence interval at 95%.

Results: The results showed that the mean of TPH in the drilling cutting in Khuzestan oil field was 42.004 g/kg that it has arrived to 18.77 g/kg during 2 months of biocompost biological process with biological sludge in the ratio of 1 to 1.

Conclusion: The petroleum hydrocarbons are major parts of contaminants in drilling industry, so biological processes as a suitable process and environmental friendly are available for organizing and disinfecting of drilling cutting.