Recycling ofpyrolyticcarbonin oilysludgeresidues

Pyrolytic residues of oily sludge are treated as resources by a combination of physical flotation and chemical separation to recover the pyrolytic carbon using for the treatment of oilfield wastewater and adsorption of oil. The results show that purity of the pyrolytic carbon is 95.93%, with many pores of different sizes distributing on the surface, which are mainly mesopores. Specific surface area, pore volume and average pore diameter reaches 454.47 m²/g, 0.61 cm³/g and 6.91 nm respectively. Adsorption effect of the pyrolytic carbon on COD and oil in oilfield wastewater is better than that of activated carbon at the same condition. For adsorption of diesel and crude oil, initial instantaneous adsorption rate of pyrolytic carbon is 3.8 times and 1.86 times faster than that of activated carbon respectively. When pyrolytic carbon reaches saturated adsorption, cumulative adsorption of activated carbon to diesel and crude oil is much lower than that of pyrolytic carbon.