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| Type |
Poster Presentation |
| Area |
환경에너지 |
| Room No. |
포스터발표장 |
| Time |
4월 20일 (목요일) 11:00~12:30 |
| Code |
ENVR.P-495 |
| Subject |
Comparing removal efficiencies of 1,4-dioxane and Arsenic(III) by nZVI-common oxidant systems |
| Authors |
강유경, 장윤석*
POSTECH 환경공학부, Korea
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| Abstract |
Nanoscale zerovalent iron (nZVI) activated three common peroxides (persulfate (PS), peroxymonosulfate (PMS) and hydrogen peroxide (HP)) were evaluated for 1,4-dioxane and As(III) removal. The peroxide oxidants are capable of producing radicals when they are coupled with initiators like UV, heat and transition metals. In this study, nZVI was used as an alternative to release Fe(II) and adsorbent for arsenic species. The order of removal efficiencies of 1,4-dioxane and As(III) was PS > HP > PMS with nZVI. Also, the nZVI/PS system showed high efficiency in simultaneous removal of both contaminants. As oxidant concentration increases, the removal efficiency also increased while high nZVI dosage only enhanced As removal. The increasing pH had negative effect to nZVI/oxidant systems due to the lower Fe(II) dissolution from nZVI. In pH 3, Fe(II) dissolution was promoted with three oxidants, especially PS dissolved large amount of Fe ions in presence of As(III) in pH 3 - 7. The promoted corrosion could accelerate removal of As by co-precipitation with Fe ions. The main produced radical was hydroxyl radical (OH∙, E0=2.70V),while sulfate radical (SO4•-,E0=2.60V)contributedpartiallyin1,4-dioxaneremoval.The main removal mechanism of As(III) was not an oxidation with radicals, rather by adsorption and co-precipitation. The knowledge gained from this study aids in selecting proper oxidant used with nZVI to purify water/wastewater contaminated by organic/inorganic contaminants. |
| E-mail |
ygkang74@postech.ac.kr |
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119th General Meeting of the KCS