| In this dissertation, the combination treatment of Fenton’s reagent and sawdust was applied to the dewaterability of raw oily sludge, and we also investigated the preliminary comprehensive utilization of the remained material after dewaterability.By analyzing the moisture content of the filtrate cake and the supernatant gained by treatment of Fenton’s reagent only and combination treatment of Fenton’s reagent and sawdust respectively, we found that the moisture content of the former treatment was 67.5%, while the later one was 68.1%. As to the supernatant, the two kinds have the same pH about 2.65, smaller than raw oily sludge. The iron concentration and total organic carbon content of the supernatant gained by treatment of Fenton’s reagent only were 1320mg/L and 98.7mg/L, respectively, while the two indexes of supernatant obtained by Fenton’s reagent combined with sawdust were 1130mg/L and 86.83mg/L. The dewaterability treatment indicates that it would not effective when applied Fenton’s reagent only in oily sludge dewatering, and the combination of Fenton’s reagent and sawdust can obtain obvious effect with which the capillary suction time and specific resistance to filtration were reduced from 1760s and 13.8×1012m/kg to 185s and 1.5×1012m/kg, respectively. And the two indexes were reduced to 976s and 7.6x 1012m/kg when using Fenton’s treatment only.The dewatered oily sludge was first analyzed by thermogravimetric in order to make sure whether it can be made into adsorbent, and it was made into some different kinds of adsorbents. After cleaned and dried, the adsorbents were screened and then assayed by BET, scanning electron microscope and Fourier transform infrared spectroscopy with the purpose of researching the surface morphology and group of the adsorbents. The results show that a highercarbonization temperature can be beneficial to the development of surface texture, thus the values of specific surface area and pore volume can be increased at the same time, these are very helpful to the adsorption of X-3B. Actually, we find that adsorbent activated by 40 wt.% of ZnCl2 for 24h first, then carbonized at 800℃ in inert atmosphere for 45 min can have a maximum specific surface area and pore volume of 183 m2/g and 0.19 cm3/g, respectively, which performed much better than any other seven lab-made adsorbents. Adsorbent made from dewatered oily sludge can has a maximum adsorption capacity of 67.72mg/g, although lower than the value of commercial activated carbon, it has a shorter adsorption equilibration time than commercial activated carbon. Meanwhile, the extent of adsorption of adsorbent made from dewatered oily sludge was larger than the value of commercial activated carbon within the adsorption equilibration time of the lab-made adsorbent. The adsorption kinetic and isothermal adsorption test revealed that the adsorption of X-3B onto the lab-made adsorbent are in accord with the pseudo-second kinetic model and Langmuir model, respectively. It belongs to the monolayer adsorption and can give out energy during the adsorption process.Through the analysis of dewatered oily sludge, we understood there were several heavy metals in the material, of which the content of iron is 66200mg/kg by dry mass, make it the highest of all the eight kinds of metal. The other seven kinds of metal and their contents are as follows, zinc:3460mg/kg, lead:330mg/kg, chrome:140mg/kg, cadmium:12mg/kg, copper:45mg/kg, nickel:97mg/kg, manganese:118mg/kg. In the adsorbed X-3B solution, the contents of all other kinds of metal are between 0 and 4.71 mg/L except iron, which.has an maximum concentration of 69.12 mg/L. It’s indicated that the metal salts contained in oily sludge were transferred to insoluble metallic oxide after carbonization process, which is helpful in preventing heavy metal from dissolving in the X-3B solution. |
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