Affiliation:
1. National Taiwan University
Abstract
The main objective of this study was to evaluate and optimize the chemical oxidation process to be implemented at a power plant in Penghu County, Taiwan through laboratory and pilot-scale experiments were used to evaluate and optimize the chemical oxidation process at a power plant in Penghu County, Taiwan. Prior to pilot test, bench-scale tests were performed in the laboratory and analytical results indicated that persulfate oxidation achieved 90% removal of fuel oil while Fenton-like oxidation achieved only 41% removal of fuel oil within three days of testing period. Persulfate oxidation coupled with Fenton-like reaction was then used in a pilot test to treat the contaminated soil onsite. The Fenton-like reaction served the first stage of oxidation which formed hydroxyl radicals to break down fuel oil. The excess heat and ferrous ions resulted from such oxidation process would then activate persulfate oxidation which, in turn, produced sulfate radicals for continual brake-down of fuel oil. Result of soil pilot test indicated that the concentration of fuel oil was reduced to below the regulated standard in less than a week. Because the treated soil was originated from the local basaltic basement rock, it is rich in heavy metals, by nature. As such, the heavy metals as nickel and chromium were detected in leachate collected from the treatment cells, at concentrations exceeding the Taiwan Contaminant Control Standard and would have posed secondary contamination to the ambient environment if in-situ soil persulfate oxidation was implemented. Therefore, the result of this case study provides an alert that implementation of in-situ persulfate oxidation for soil and groundwater treatment could pose a threat of secondary contamination of heavy metals to the ambient environment.
Publisher
Trans Tech Publications, Ltd.
Reference26 articles.
1. Interstate Technology and Regulatory Council (ITRC), Technical and regulatory guidance for in situ chemical oxidation of contaminated soil and groundwater, 2nd ed., (2005).
2. G.V. Buxton, C. Greenstock, W.P. Hellman and A.B. Ross, Critical review of rate constants for reactions of hydrated electrons, hydrogen atoms, and hydroxyl radicals (OH‧/O-‧) in aqueous solution, J. Physical and Chemical Reference Data, vol. 17(2), (1988).
3. J.J. Pignatello, Dark and photoassisted Fe3+ catalyzed degradation of chlorophenoxyl herbicides by hydrogen peroxide, Environmental Science and Technology, vol. 26(5), (1992), pp.944-951.
4. E. Lipczynska-Kochany, S. Gregor and S. Harms, Influence of some groundwater and surface water constituents on the degradation of 4-chlorophenol by the Fenton reaction, Chemosphere, vol. 30(1), (1995), pp.9-20.
5. C.J. Liang, Z.S. Wang and N. Mohanty, Influence of carbonate and chloride ions on persulfate oxidation of trichloroethylene at 20℃, Science of the Total Environment, vol. 370, (2006), pp.271-277.
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