In this study, modification of iron-oxide-coated sand (IOCS) with three quaternary ammonium compounds (QACs) was tested as a means to improve the removal of aqueous natural organic matter (NOM) by IOCS. The assessment was conducted in batch, isotherm setup with changes in types and concentrations of QACs, modification pH, additions of H2O2 during modification, and adsorption pH. IOCS modification with long chain QACs, including hexadecyltrimethylammonium bromide (HDTMA) and hexadecylbenzyldimethylammonium chloride (HDBDMA) significantly increased the adsorption of NOM, while coating IOCS with short chain QAC, tetrapropylammonium chloride (TPA) had no positive effect. The enhancement increased with increasing pH and increasing QAC concentration used during modification. Co-additions of long chain QACs with H2O2 during modification could further improve NOM adsorption. Modification of IOCS with 10.0 mM HDTMA at pH 9.9 with the 0.2% H2O2 addition doubled NOM adsorption capacity on IOCS at pH 9.1. The results presented here suggest that the modification of IOCS using long chain QACs can enhance NOM removal by IOCS during drinking water treatment.
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Research Article|
December 01 2008
Aqueous natural organic matter removal by quaternary-ammonium-compound-modified iron-oxide-coated sand
Chunli Ding;
1Department of Civil Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong E-mail: ocedcl@ust.hk; cechii@ust.hk
E-mail: ocedcl@ust.hk
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Chii Shang;
Chii Shang
1Department of Civil Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong E-mail: ocedcl@ust.hk; cechii@ust.hk
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Yujung Chang
Yujung Chang
2HDR Engineering, Inc, 500 108th Avenue NE, Bellevue, WA 98004-5549, USA E-mail: yujung.chang@hdrinc.com
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Water Supply (2008) 8 (5): 565–571.
Citation
Chunli Ding, Chii Shang, Yujung Chang; Aqueous natural organic matter removal by quaternary-ammonium-compound-modified iron-oxide-coated sand. Water Supply 1 December 2008; 8 (5): 565–571. doi: https://doi.org/10.2166/ws.2008.115
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Chunli Ding, Chii Shang, Yujung Chang; Aqueous natural organic matter removal by quaternary-ammonium-compound-modified iron-oxide-coated sand. Water Supply 1 December 2008; 8 (5): 565–571. doi: https://doi.org/10.2166/ws.2008.115
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