Removal of natural organic matter from source water: Review on coagulants, dual coagulation, alternative coagulants, and mechanisms

Dayarathne, H.N.P.; Angove, Michael J.; Aryal, Rupak; Abuel-Naga, Hossam; Mainali, Bandita

doi:10.1016/j.jwpe.2020.101820

Cited by 108 publications

(48 citation statements)

References 133 publications

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“…Considering that acidic and oligotrophic waters often have a brown to yellow "tea" tint, 25 in particular due to humic acids (humic acids are one of the most important fractions of humus, thanks to their hydrophilic functions of the carboxylic acid type), they can retain about fifteen times their weight in water, and thus play a fundamental role in water retention and the useful water reserve of a soil. 26 After having created turbidity with humic acid, the water takes on a "tea" hue, not to mention that the turbidity contains various mineral and organic matter in suspension or in solution. Dissolved and colloidal matter alone constitutes 60 to 80 % of the organic load (humic acids).…”

Section: Jar Testmentioning

confidence: 99%

Optimisation and Prediction of the Coagulant Dose for the Elimination of Organic Micropollutants Based on Turbidity

Tahraoui

Belhadj

Moula

et al. 2021

Kemija U Industriji

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Section: Jar Testmentioning

confidence: 99%

Optimisation and Prediction of the Coagulant Dose for the Elimination of Organic Micropollutants Based on Turbidity

Tahraoui

Belhadj

Moula

et al. 2021

Kemija U Industriji

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“…The zeta potential of the flocs was examined to evaluate the ability of the flocculant to destabilize the particles (Dayarathne et al 2020). According to Figure 5, within the selected PAC dosage (1-6 mg/L), the zeta potentials of the three model DOM were all negative, and reached the lowest at the PAC dosage of 6 mg/L.…”

Section: The Floc Properties On the Uf Membrane Foulingmentioning

confidence: 99%

Effects of micro-flocculation pretreatment on the ultrafiltration membrane fouling caused by different dissolved organic matters in treated wastewater

Ren

Liu

Meng

et al. 2021

Journal of Water Reuse and Desalination

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This study investigated the efficacy of using micro-flocculation as a pretreatment approach in alleviating ultrafiltration (UF) membrane fouling caused by organic matters in treated wastewater. Three typical model dissolved organic matters (DOM), humic acid, fulvic acid, and sodium alginate, were employed to simulate membrane fouling. The results showed that micro-flocculation using poly aluminum chloride (PAC) or polymerized ferric sulfate (PFS) as flocculant could effectively enhance the treatment performance of UF process on DOM. With 6 mg/L PAC, the removal efficiency of humic acid, fulvic acid, and sodium alginate by micro-flocculation combined UF process reached 79.95%, 63.25%, and 51.14%, respectively. Specifically, after micro-flocculation, micromolecular hydrophilic organic matter (e.g., fulvic acid) tended to form a compact cake layer. The macromolecular hydrophobic organic matter (e.g., humic acid) and macromolecular hydrophilic organic matter (e.g., sodium alginate) generally led to a loose cake layer. At PAC dosage of 6 mg/L, the membrane specific flux (J/J0) at the end was improved by 11.71%, 10.27%, and 2.2% for humic acid, sodium alginate and fulvic acid solutions, respectively, compared with UF process alone. It could be inferred that micro-flocculation pretreatment can effectively mitigate the membrane fouling when treating wastewater containing humic acid, sodium alginate, or fulvic acid.

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“…Thus, minimizing NOM content prior to disinfection treatment can be identified as an urgent need to avoid DBP yield [7]. Different technologies such as photocatalysis [8], electrochemical treatments [9], the Fenton process [10], adsorption [11], ionic exchange [12] or coagulation [13] have been explored to remove NOM from drinking water sources prior to disinfection. However, coagulation treatment presents the most techno-economically viable option, and it is therefore the most widely used in drinking water treatment plants worldwide.…”

Section: Introductionmentioning

confidence: 99%

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

Yang

Kan

et al. 2021

Water

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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 ~77% NOM was attained with PACl than with FeCl3 (~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.

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Removal of natural organic matter from source water: Review on coagulants, dual coagulation, alternative coagulants, and mechanisms

Cited by 108 publications

References 133 publications

Optimisation and Prediction of the Coagulant Dose for the Elimination of Organic Micropollutants Based on Turbidity

Optimisation and Prediction of the Coagulant Dose for the Elimination of Organic Micropollutants Based on Turbidity

Effects of micro-flocculation pretreatment on the ultrafiltration membrane fouling caused by different dissolved organic matters in treated wastewater

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

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