Abstract
Pyrolytic residues of oily sludge are a kind of hazardous solid waste produced by high-temperature pyrolysis of oily sludge, which still contains a certain amount of mineral oil; improper disposal can cause secondary pollution. In order to reutilize the pyrolytic residues of oily sludge, the pyrolytic carbon in pyrolytic residues is recovered by a combination of physical flotation and chemical separation, and they are used for the treatment of oilfield wastewater and adsorption of oil. The results showed that the purity of the pyrolytic carbon is 95.93%; many pores of different sizes are distributed on the surface, with mainly mesoporous distribution. Specific surface area, pore volume, and average pore diameter reach 454.47 m2/g, 0.61 cm3/g, and 6.91 nm, respectively. Adsorption effect of pyrolytic carbon on COD and oil in oilfield wastewater is better than that of activated carbon at the same condition. With regard to adsorption on diesel and crude oil, the 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 on diesel and crude oil is much lower than that of pyrolytic carbon.
Highlights
E pyrolytic products of oily sludge include three phases: liquid products are water, low condensation point crude, etc.; gaseous products are usually CH4, CO2, CO, H2, etc.; and solid products are residues in the reactor generally called pyrolytic residues after pyrolysis reaction
Research of oily sludge pyrolysis is mainly concentrated on pyrolysis process, output, and properties of pyrolytic oil and gas, and little works have covered on pyrolytic residues with a large portion of pyrolytic products containing unrecovered oil and some heavy metals, which will cause secondary pollution if not disposed properly [4,5,6]. e pyrolytic residues of oily sludge are listed in “National
E paper studied on the pyrolytic carbon in pyrolytic residues recovered by the combination of physical flotation and chemical separation, and pyrolytic carbon is used for the treatment of typical pollutants from oilfield wastewater and oil adsorption for the characteristics of its high carbon content in residues after pyrolysis of oily sludge. erefore, the use of pyrolytic carbon was clarified and the reutilization of pyrolytic residues of oily sludge was realized
Summary
Composition of Pyrolytic Residues and eir Heavy Metal Pollutants. Pyrolytic residues of oily sludge were from the oily sludge pyrolysis station Liaohe Oilfield. Water content and oil content of residues were measured according. International Journal of Analytical Chemistry to standards GB/T 8929-2006 and SY/T5118-2005, respectively. Residual content was calculated by the method of dispersion. Heavy metal pollutants were analyzed by iCAP RQ ICP-MS. Determination of ash was based on the standard of GB/T7702.15-2008. Carbon purity was calculated by the gravimetric method (the ratio of the product after removing the ash to the mass of the product). E elemental analysis was adopted by Quantax 200XFlash5000-10 EDS. Analysis of surface properties and SEM were performed by using NOVA-2000e N2 adsorption ASAP and Quanta250 tungsten filament scanning electron microscope, respectively. Determination of iodine value was based on the standard of GB/T7702.7-2008
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