Removal of humic substances by coagulation

O’Melia, Charles R.; Becker, William C.; Au, Kwok-Keung

doi:10.1016/s0273-1223(99)00639-3

Cited by 61 publications

(3 citation statements)

References 5 publications

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“…A significantly greater effectiveness of the oxidisation of Fe(II) to Fe(III) and its removal in the sedimentation process was obtained as a result of chemical oxidisation by means of potassium manganate (VII) or chlorine dioxide, when low-molecular and not highmolecular compounds were dominant among the organic ligands as part of the iron-organic complex. One of the ways recommended for intensifying the removal of iron that occurs in a form of stable ferro-organic compounds is application of the coagulation process, preferably with aluminium salt (Krupińska 2012;Albrektiene et al 2011;Libecki, Dziejowski 2010;Libecki, Dziejowski 2008;Potgieter et al 2005;O'Melia et al 1999;Huang, Shiu 1996;Jekel 1986;Dempsey et al 1984). It has also been found that polymerised polyaluminium chlorides are more effective at removing organic substances and reducing turbidity than aluminium sulphate (VI) (Krupińska 2014;Eikebrokk, Fettig 1990;Dempsey et al 1985).…”

Section: Introductionmentioning

confidence: 99%

The Impact of the Oxidising Agent Type and Coagulant Type on the Effectiveness of Coagulation in the Removal of Pollutants From Underground Water With an Increased Content of Organic Substances

Krupińska

2016

Journal of Environmental Engineering and Landscape Management

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To cite this article: Izabela Krupińska (2016) The impact of the oxidising agent type and coagulant type on the effectiveness of coagulation in the removal of pollutants from underground water with an increased content of organic substances, Journal of Environmental Engineering and Landscape Management, 24:1, 70-78, Abstract. Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Reference to this paper should be made as follows: Nõ lvak, H.; Truu, J.; Limane, B.; Truu, M.; Cepurnieks, G.; Bartkevičs, V.; Juhanson, J.; Muter, O. 2013. Microbial community changes in TNT spiked soil bioremediation trial using biostimulation, phytoremediation and bioaugmentation, Journal of Environmental Engineering and Landscape Management 21(3): 153Á162. http://dx. abstract.The article presents the results of studies concerning the impact of the method of Fe(II) ion oxidisation on the effectiveness of coagulation in the removal of pollutants from underground water with an increased content of organic substances (TOC up to 5.338mgC/dm 3 ). In order to oxidise the Fe (II) ions before the coagulation process, the underground water was subjected to aeration, or either potassium manganate (VII) or hydrogen peroxide were dosed in the stoichiometric amount in view of the concentration of Fe (II). The efficiencies of three coagulants were compared: that of aluminium sulphate (VI), polyaluminium chloride (PAX XL-60) and iron (III) sulphate (VI) -PIX-112. Coagulant doses expressed in mgAl/dm 3 or mgFe/dm 3 and changed within the range of 1 to 6 mgAl(Fe)/dm 3 . Volume coagulation was performed in 1-dm 3 groundwater samples using 1-minute rapid mix (250 rpm) and 25-minute slow mix (30 rpm) followed by 2-hour sedimentation. It has been proven that the type of oxidising agent and coagulant, as well as their dose, co-determines the effectiveness of the removal of the pollutants. Among the used methods of iron (II) oxidisation, the best effects have been achieved by potassium manganate (VII) with regards to the effects of the reduction...

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Section: Introductionmentioning

confidence: 99%

The Impact of the Oxidising Agent Type and Coagulant Type on the Effectiveness of Coagulation in the Removal of Pollutants From Underground Water With an Increased Content of Organic Substances

Krupińska

2016

Journal of Environmental Engineering and Landscape Management

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“…Much of the previous work in NOM research has been carried out on optimizing NOM removal using metal salts in terms of the amount of coagulant added and the coagulation pH ( − ) and how the change in character of NOM impacts on the treatment performance ( − ). The work carried out on NOM flocs has concentrated on how these fragile structures may be quantified and how flocs may change from season to season with variable water quality ( , ).…”

Section: Introductionmentioning

confidence: 99%

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

Jarvis

Jefferson

Parsons

2005

Environ. Sci. Technol.

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Periods of elevated natural organic matter (NOM) loadings at water treatment works (WTW) can lead to operational problems as a result of deterioration in floc structural quality. This study used a range of diagnostic tools to evaluate floc structure with increasing organic fraction in the floc. It was observed that when the organic fraction in the floc went significantly over a mass ratio of 1 mg of DOC to 1 mg of Fe (coagulant), the floc size, settling velocity, fractal dimension, and strength were seen to decrease even when the NOM removed during coagulation remained high. A model was proposed to explain these changes that was dependent upon the adsorption of NOM on primary particle surfaces. The operational significance of these results suggests that for the coagulant under investigation the correct coagulant dose must be applied to give good floc structure.

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“…liquid chromatography-organic carbon detection LC-OCD, 25 are a fraction of DOC that are well-removed during coagulation treatment. 19,[26][27][28][29] SUVA and HS/DOC are reportedly good indicators of treatability. 27 DOC concentrations and character vary on a range of timescales, including seasonal, daily, and sub-daily through changing source areas and in-stream processes.…”

Section: Introductionmentioning

confidence: 98%

Evaluating the accuracy of two in situ optical sensors to estimate DOC concentrations for drinking water production

Hoffmeister

Murphy

Cascone

et al. 2020

Environ. Sci.: Water Res. Technol.

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Removal of humic substances by coagulation

Cited by 61 publications

References 5 publications

The Impact of the Oxidising Agent Type and Coagulant Type on the Effectiveness of Coagulation in the Removal of Pollutants From Underground Water With an Increased Content of Organic Substances

The Impact of the Oxidising Agent Type and Coagulant Type on the Effectiveness of Coagulation in the Removal of Pollutants From Underground Water With an Increased Content of Organic Substances

How the Natural Organic Matter to Coagulant Ratio Impacts on Floc Structural Properties

Evaluating the accuracy of two in situ optical sensors to estimate DOC concentrations for drinking water production

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