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비소제거를 위한 Fe(III)-ettringite 합성방법 및 특성 연구

Title
비소제거를 위한 Fe(III)-ettringite 합성방법 및 특성 연구
Other Titles
Removal of Arsenic in Synthesis Method and Characteristics of Fe(III)-ettringite
Author
박주양
Keywords
비소제거; 3가철 에트린자이트; 공침; 주사전자현미경; Arsenic removal; Fe(III)-ettringite; Coprecipitation; SEM
Issue Date
2011-02
Publisher
대한상하수도학회
Citation
상하수도학회지, 2011, 25(1), P.15-21
Abstract
Arsenic is one of the most abundant contaminant found in waste mine tailings, because of it's carcinogenic property, the countries like United states of America and Europe have made stringent regulations which govern the concentration of arsenic in drinking water. The current study focuses on different treatment methods for removal of arsenic from waste water. Treatment method the high strength arsenic waste water is treated with Fe(III)-ettringite by co-precipitation method. Number of experiments were carried out to decide the optimal dosage of Fe(III)-ettringite to treat arsenic waste water. The Fe(III)-ettringite was synthesized by taking appropriate equivalent ratios of calcium oxide and ferric chloride in proportion to the arsenic. The best removal efficiencies of 94% were observed at a As/(Ca: Fe) ratio of 1:3. The maximum removal of arsenic was observed in pH range of 12. But as the pH increases the arsenic removal efficiency decreases as portlandite is formed in the pH above 12. The analysis of surface of precipitate conform the needle like structure of ettringite. This treatment technique has promising features such as, the chemicals required in the treatment as well as the sludge generated can be reduced. The operating pH range is in alkaline region which is advantageous over traditional treatment process which has lower pH. Also the co-precipitation not only helps in removal of arsenic but also heavy metals.
URI
http://www.ndsl.kr/ndsl/search/detail/article/articleSearchResultDetail.do?cn=JAKO201119074171165
ISSN
1225-7672; 2287-822x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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