Natural Organic Matter Removal from Raw Surface Water: Benchmarking Performance of Chemical Coagulants through Excitation-Emission Fluorescence Matrix Spectroscopy Analysis

doi:10.3390/w13020146

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Title:	Natural Organic Matter Removal from Raw Surface Water: Benchmarking Performance of Chemical Coagulants through Excitation-Emission Fluorescence Matrix Spectroscopy Analysis
Authors:	Go, Raymond John C. Yang, Hui-Ling Kan, Chi-Chuan Ong, Dennis C. Garcia-Segura, Sergi de Luna, Mark Daniel G.
Contributors:	Univ Philippines Diliman, Environm Engn Program, Natl Grad Sch Engn Feng Chia Univ, Dept Environm Engn & Sci Chia Nan Univ Pharm & Sci, Inst Hot Spring Ind Univ Philippines Visayas, Sch Technol Arizona State Univ, Nanosyst Engn Res Ctr Nanotechnol Enabled Water T, Sch Sustainable Engn & Built Environm Univ Philippines Diliman, Dept Chem Engn
Keywords:	coagulation excitation-emission fluorescence matrix full factorial design natural organic matter physical water treatment raw surface water
Date:	2021
Issue Date:	2023-11-11 12:00:00 (UTC+8)
Publisher:	MDPI
Abstract:	Chemical disinfection of surface waters has been proven effective in minimizing the risk of contamination by water-borne pathogens. However, surface waters contain natural organic matter (NOM) which, upon chemical disinfection, is readily converted into hazardous disinfection-by-products. Hence, NOM removal from these waters is critical. Chemical coagulation is a readily implementable technology to minimize these undesired side-effects by NOM removal. Herein, capabilities of ferric chloride (FeCl3) and polyaluminum chloride (PACl) as pre-treatment for NOM abatement from natural raw surface water have been benchmarked. Excitation-emission fluorescence matrix (EEM) spectroscopy characterization of NOM fractions demonstrated high removal efficiency. A two-level full factorial design was employed to analyze the effects of coagulant dosage and initial pH on the removal of turbidity, humic acid-like substances and fulvic acid-like substances from the raw water. Higher removal of similar to 77% NOM was attained with PACl than with FeCl3 (similar to 72%). Optimization through response surface methodology showed that the initial pH-coagulant dosage interaction was significant in removing NOM and turbidity for both PACl and FeCl3. These results identify the opportunity for coagulation technologies to prevent and minimize disinfection-by-products formation through NOM removal.
Relation:	WATER-SUI, v.13, n.2, pp.146
Appears in Collections:	[Dept. of Tourism Management] Periodical Articles

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