Effects on nano zero-valent iron reactivity of interactions between hardness, alkalinity, and natural organic matter in reverse osmosis concentrate

Yuhoon Hwang, Hang-Sik Shin

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nanoscale zero-valent iron (NZVI) is considered to have potential to reduce nitrate in the concentrate generated by high pressure membrane processes aimed at water reuse. However, it is necessary to verify the effect of the matrix components in the concentrates on NZVI reactivity. In this study, the influence of hardness, alkalinity, and organic matter on NZVI reactivity was evaluated by the response surface method (RSM). Hardness (Ca2 ) had a positive effect on NZVI reactivity by accelerating iron corrosion. In contrast, alkalinity (bicarbonate; HCO3-) and organic matter (humic acid; HA) had negative effects on NZVI reactivity due to morphological change to carbonate green rust, and to competitive adsorption of HA, respectively. The validity of the statistical prediction model derived from RSM was confirmed by an additional confirmation experiment, and the experimental result was within the 95% confidential interval. Therefore, it can be said that the RSM model produced results that were statistically significant.
Original languageEnglish
JournalJournal of Environmental Sciences
Volume25
Issue number11
Pages (from-to)2177-2184
ISSN1001-0742
DOIs
Publication statusPublished - 2013

Cite this

@article{cb285a7a507a492095e274270d036001,
title = "Effects on nano zero-valent iron reactivity of interactions between hardness, alkalinity, and natural organic matter in reverse osmosis concentrate",
abstract = "Nanoscale zero-valent iron (NZVI) is considered to have potential to reduce nitrate in the concentrate generated by high pressure membrane processes aimed at water reuse. However, it is necessary to verify the effect of the matrix components in the concentrates on NZVI reactivity. In this study, the influence of hardness, alkalinity, and organic matter on NZVI reactivity was evaluated by the response surface method (RSM). Hardness (Ca2 ) had a positive effect on NZVI reactivity by accelerating iron corrosion. In contrast, alkalinity (bicarbonate; HCO3-) and organic matter (humic acid; HA) had negative effects on NZVI reactivity due to morphological change to carbonate green rust, and to competitive adsorption of HA, respectively. The validity of the statistical prediction model derived from RSM was confirmed by an additional confirmation experiment, and the experimental result was within the 95{\%} confidential interval. Therefore, it can be said that the RSM model produced results that were statistically significant.",
author = "Yuhoon Hwang and Hang-Sik Shin",
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doi = "10.1016/S1001-0742(12)60323-4",
language = "English",
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journal = "Journal of Environmental Sciences",
issn = "1001-0742",
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}

Effects on nano zero-valent iron reactivity of interactions between hardness, alkalinity, and natural organic matter in reverse osmosis concentrate. / Hwang, Yuhoon; Shin, Hang-Sik.

In: Journal of Environmental Sciences, Vol. 25, No. 11, 2013, p. 2177-2184.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effects on nano zero-valent iron reactivity of interactions between hardness, alkalinity, and natural organic matter in reverse osmosis concentrate

AU - Hwang, Yuhoon

AU - Shin, Hang-Sik

PY - 2013

Y1 - 2013

N2 - Nanoscale zero-valent iron (NZVI) is considered to have potential to reduce nitrate in the concentrate generated by high pressure membrane processes aimed at water reuse. However, it is necessary to verify the effect of the matrix components in the concentrates on NZVI reactivity. In this study, the influence of hardness, alkalinity, and organic matter on NZVI reactivity was evaluated by the response surface method (RSM). Hardness (Ca2 ) had a positive effect on NZVI reactivity by accelerating iron corrosion. In contrast, alkalinity (bicarbonate; HCO3-) and organic matter (humic acid; HA) had negative effects on NZVI reactivity due to morphological change to carbonate green rust, and to competitive adsorption of HA, respectively. The validity of the statistical prediction model derived from RSM was confirmed by an additional confirmation experiment, and the experimental result was within the 95% confidential interval. Therefore, it can be said that the RSM model produced results that were statistically significant.

AB - Nanoscale zero-valent iron (NZVI) is considered to have potential to reduce nitrate in the concentrate generated by high pressure membrane processes aimed at water reuse. However, it is necessary to verify the effect of the matrix components in the concentrates on NZVI reactivity. In this study, the influence of hardness, alkalinity, and organic matter on NZVI reactivity was evaluated by the response surface method (RSM). Hardness (Ca2 ) had a positive effect on NZVI reactivity by accelerating iron corrosion. In contrast, alkalinity (bicarbonate; HCO3-) and organic matter (humic acid; HA) had negative effects on NZVI reactivity due to morphological change to carbonate green rust, and to competitive adsorption of HA, respectively. The validity of the statistical prediction model derived from RSM was confirmed by an additional confirmation experiment, and the experimental result was within the 95% confidential interval. Therefore, it can be said that the RSM model produced results that were statistically significant.

U2 - 10.1016/S1001-0742(12)60323-4

DO - 10.1016/S1001-0742(12)60323-4

M3 - Journal article

VL - 25

SP - 2177

EP - 2184

JO - Journal of Environmental Sciences

JF - Journal of Environmental Sciences

SN - 1001-0742

IS - 11

ER -