In anoxic environment, organic matter in oily sludge can be decomposed into solid carbon, liquid fuel oil, etc., which can be reused. It is found that the oil and gas can be recovered more effectively by pyrolysis of oily sludge, and the utilization value of residue can be developed again, which has good benefits. Meanwhile, the pyrolysis treatment is thoroughly and quickly disposed process.

The treatment technology of oily sludge is diverse and has its own advantages. It is difficult to meet the environmental protection requirements by single treatment process, because no one technology can be used as an ideal method for treating all kinds of oily sludge. Auxiliary equipments are to achieve better effect, lower cost and larger capacity.

The main purpose of chemical cleaning technology also called thermochemical separation is to realize oil, sludge and water three-phase separation. The advantages of chemical cleaning method are simple, low cost, high reliability and high oil recovery rate. It’s suitable for oily sludge with high oil content and light emulsification. The separation efficiency of chemical cleaning method is affected by the type and dosage of reagent, washing temperature, liquid-solid ratio, stirring intensity, stirring time and pH value.