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REMOVAL OF PCDD/FS, PCP AND MERCURY FROM SEDIMENTS: THERMAL OXIDATION VERSUS PYROLYSIS
Chang, M.-B. Chang, Y.-C. Hsu, and S.-H. Chang.
Chemosphere 207:10-17(2018)

A continuous pilot-scale thermal treatment system equipped with effective air pollution control devices was used for simultaneous remediation of sediments contaminated with PCDD/Fs, PCP, and Hg. The removal efficiencies of these three pollutants in sediments collected from (1) a seawater pond and (2) a river, respectively, were evaluated via thermal treatment processes. PAHs and chlorobenzenes (CBz) formed during thermal oxidation and pyrolysis were also analyzed to gain a better understanding of chlorinated organics behavior. Results indicated that low-molecular-weight PAHs were closely related to the formation of CBz, PCDD/Fs, and CPs, while low chlorinated PCDD/Fs and CBz predominated in flue gas with thermal oxidation. Particulate matter concentration was higher in thermal oxidation than pyrolysis due to the higher air flow rate of thermal oxidation, which might bring more particles out of the furnace and have a greater potential to form PCDD/Fs within air pollution control devices. Pyrolysis performed more effectively than thermal oxidation for removal of total PCDD/Fs and thus was more suitable for remediating the contaminated sediment. PCDD/Fs, PCP, and Hg removal efficiencies in sediments using pyrolysis increased with increasing operating temperature and retention time. Overall, residual concentrations of PCDD/Fs and PCP in river sediment were higher than those in seawater-pond sediment; significant formation of tar was observed due to higher organic matter content in river sediment.



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