The use of a pumice stone in removal of petroleum hydrocarbons from industrial wastewater through coagulation and flocculation

Background: Petroleum hydrocarbons that are released from industrial processes cause damage to aquatic life and degrade ecosystems by accumulating in the food chain, allowing living organisms produce toxic secretions. Methods: In this study, a pumice stone was used remove total petroleum (TPHs) wastewater south refinery company Iraq/Basrah coagulation flocculation using design of experiments (DOE) approach method analyzing screening designs measurement samples GC instrument. Results: The maximum removal 99% at pH 3, dose 0.5 g, time 60 min, comparison made between DOE multiple linear regression (MLR) determine effectiveness system used, which proved its incredible effectiveness. Conclusion: According results, great convergence actual prediction results found, while MLR very far predicted results. high efficiency found removing South Refineries Company. Pumice is widely available market cheap economically.