Removal of nitrate from groundwater using ZVI treatment system combined with continuous CO2 gas bubbling

Title
Removal of nitrate from groundwater using ZVI treatment system combined with continuous CO2 gas bubbling
Author
전병훈
Keywords
Aeration; Ferrous ion; Gaseous carbon dioxide diffusion; Nitrate; Zero-valent iron
Issue Date
2012-03
Publisher
Taylor & Francis
Citation
Geosystem Engineering, 2012, 15(1), P.60-65
Abstract
Zero-valent iron (ZVI) treatment system combined with pH adjustment, aeration, sedimentation, and microfiltration processes was developed for the robust removal of nitrate from groundwater. Powdered ZVI dosed at 10 g L-1 removed nitrate by 166 mg L-1, of which 80% were converted to ammonium ion for a given contact time of 125 hr. By diffusing gaseous carbon dioxide (CO2)into the ZVI reactor, pH was desirably controlled in the range of 5.5-6.5, and concurrently <0.5 mg L-1 dissolved oxygen was consistently maintained during the longer-term of dissolved oxygen ZVI treatment system. The combination of ZVI treatment and CO2 gas bubbling reached up to 35% removal of nitrate and passivation on the surface of ZVI was prevented by diffusing CO2 gas. Soluble Fe (II) concentration of mixed liquor in the ZVI reactor ranged between 0.2 and 7.8 mg L-1, and Fe (II) dissolved in the ZVI treated water was almost completely removed by subsequent aeration. The overall result shows that the novel ZVI treatment system is significantly promising to remove nitrate in groundwater and therefore to meet the regulatory limit for drinking water.
URI
https://www.tandfonline.com/doi/abs/10.1080/12269328.2012.677620?journalCode=tges20http://repository.hanyang.ac.kr/handle/20.500.11754/69605
ISSN
1226-9328
DOI
10.1080/12269328.2012.677620
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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