Enhancing zero valent iron based natural organic matter removal by mixing with dispersed carbon cathodes

Liu, Peng, Keller, Jurg and Gernjak, Wolfgang (2016) Enhancing zero valent iron based natural organic matter removal by mixing with dispersed carbon cathodes. Science of the Total Environment, 550 95-102. doi:10.1016/j.scitotenv.2016.01.067


Author Liu, Peng
Keller, Jurg
Gernjak, Wolfgang
Title Enhancing zero valent iron based natural organic matter removal by mixing with dispersed carbon cathodes
Journal name Science of the Total Environment   Check publisher's open access policy
ISSN 1879-1026
0048-9697
Publication date 2016-04-15
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.scitotenv.2016.01.067
Open Access Status Not Open Access
Volume 550
Start page 95
End page 102
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
Former studies have shown that adding granular activated carbon (GAC) cathodes could enhance the overall performance of the zero valent iron (ZVI) process for organics removal. The present study evaluates for the first time the performance of such an enhanced ZVI process to remove natural organic matter (NOM), an important water quality parameter in drinking water.

Lab-scale batch tests were conducted with surface reservoir feed water from a drinking water plant. In the GAC enhanced ZVI process dissolved organic carbon (DOC) and UV254 were reduced by 61 ± 3% and 70 ± 2%, respectively, during 24 h treatment corresponding to 1.8 min empty bed contact time. The process was superior to ZVI alone, particularly during the earlier stages of the process due to the synergistically increased iron dissolution rate. Besides GAC, graphite and anthracite also prove to be suitable and potentially more cost-effective options as cathode materials for the enhanced ZVI process, whereby electrically conductive graphite clearly outperformed anthracite.

The dominant mechanisms in terms of NOM removal from surface water were found to be coagulation following iron dissolution and adsorption in the case of employing GAC. Oxidation was also occurring to a lesser degree, converting some non-biodegradable into biodegradable DOC.
Keyword Drinking water treatment
Granular activated carbon
Natural organic matter
Zero valent iron
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
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