Characterization of organic matter in alum treated drinking water using high performance liquid chromatography and resin fractionation

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• 作者：Linan Xing^a ; Mohamad Fared Murshed^b ; Theodore Lo^c ; Rolando Fabris^d ; Christopher W.K. Chow^a ; ^b ; ^d ; ^{chris.chow@sawater.com.au} ; John van Leeuwen^a ; ^b ; Mary Drikas^a ; ^b ; ^d ; Dongsheng Wang^a ; ^b
• 关键词：Coagulation ; Natural organic matter (NOM) ; Resin fractionation ; Reverse phase high performance liquid chromatographic (RPHPLC)
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 June, 2012
• 卷：192
• 期：Complete
• 页码：186-191
• 文件大小：966 K

摘要

In order to understand and improve drinking water treatment process operations, many techniques have been established to characterize natural organic matter (NOM). Resin fractionation is the most widely used technique to isolate NOM based on its hydrophobicity and hydrophilicity, these can be used to determine the treatability of NOM, however, it is also recognized as a time consuming technique. This paper describes the use of reverse phase high performance liquid chromatography (RPHPLC) as a rapid assessment of the hydrophobicity/hydrophilicity of NOM. The reduction of total RPHPLC peak area correlated well with dissolved organic carbon (DOC) and UV absorbance at 254 nm (UV₂₅₄) removal efficiency. After resolving the RPHPLC profile using a peak fitting technique, the ratio between hydrophobic and hydrophilic peak area can be used to quantify the treatability of NOM (particularly DOC removal). Further statistical analysis grouped the resolved peaks into three groups (two groups of hydrophilic and one group of hydrophobic) and established an expression to link peak area with UV₂₅₄ and DOC removal. The characterization results were further compared by the traditional resin fractionation technique using DAX-8 and XAD-4 resins (combined). The results confirmed that despite the definition that hydrophobic and hydrophilic components measured by both methods could be different, both methods confirm that the hydrophilic fraction was recalcitrant after coagulation and is of small molecular weight.