A large amount of oily sludge was produced in the oilfield, during oil and gas gathering and refining. Most of the oily sludge was treated by the ways of central landfill and natural dried, in this process, it would be great harm to the surrounding environment. A great amount of petroleum hydrocarbon was in oily sludge, without treatment is a waste of resources. In this paper oil content and water content of polluted oil and silt was analyzed. The harm of polluted oil and silt and the existing treatment pro...