Research on oily sludge pyrolysis residue to the adsorption of biologically treated oil-field wastewater

摘要

Economical and effective oily sludge pyrolysis residue was prepared,characterized with various techniques,and applied in the removal of COD in biologically treated oil-field wastewater.It was found that surface area of oily sludge pyrolysis residue was 223.62 m2/g.The content of C and A12O3 was 27.91％ and 27.6％,respectively.Oily sludge pyrolysis residue contains carboxyl,hydroxyl,carbonyl and other oxygen-containing acid functional groups.When the adsorption equilibrium time of oily sludge pyrolysis residue was 90min,pH of solution was 4,the best COD adsorption capacity was 59.5 mg/g.Adsorption of oily sludge pyrolysis residue is determined by its structure and composition.The Al2O3 may play a flocculation and sedimentation role in COD removal,which has a synergistic effect on adsorption.The adsorption of COD from biologically treated oil-field wastewater by oily sludge pyrolysis residue follows Langmuir adsorption isotherm.