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Research paper thumbnail of Reduction of ripening time of full-scale manganese removal filters with manganese oxide-coated media

Journal of Water Supply: Research and Technology—AQUA, 2015

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Research paper thumbnail of Assessment of manganese removal from over 100 groundwater treatment plants

Journal of Water Supply: Research and Technology—AQUA, 2014

ABSTRACT The aim of this study was to make an inventory of water quality and operational paramete... more ABSTRACT The aim of this study was to make an inventory of water quality and operational parameters which could affect manganese removal through aeration and rapid sand filtration and to establish correlations between these parameters and manganese removal efficiency. The focus of the overview was on manganese removal efficiency in the first aeration-filtration stage of conventional groundwater treatment plants (GWTPs). Data from selected full-scale GWTPs have been collected, and univariate and multivariate statistical analyses were conducted. Multivariate statistics indicated that multiple parameters including NH4+ removal efficiency, iron loading per filter run (FR) and pH of filtrate play a significant role in manganese removal, while other parameters (oxygen concentration in filtrate, filtration rate and empty bed contact time (EBCT)) were found to be of secondary importance. Univariate statistical assessment of the data suggests that very effective manganese removal can be achieved when all of the following conditions are met: NH4+ removal efficiency >85%, pH of filtrate >7.1, iron loading per FR <2.7 kg Fe/m(2), oxygen concentration in filtrate >1 mg O-2/L, filtration rate <10.5 m/h and EBCT >11.5 min.

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Research paper thumbnail of Biological and physico-chemical formation of Birnessite during the ripening of manganese removal filters

Water research, 2015

The efficiency of manganese removal in conventional groundwater treatment consisting of aeration ... more The efficiency of manganese removal in conventional groundwater treatment consisting of aeration followed by rapid sand filtration, strongly depends on the ability of filter media to promote auto-catalytic adsorption of dissolved manganese and its subsequent oxidation. Earlier studies have shown that the compound responsible for the auto-catalytic activity in ripened filters is a manganese oxide called Birnessite. The aim of this study was to determine if the ripening of manganese removal filters and the formation of Birnessite on virgin sand is initiated biologically or physico-chemically. The ripening of virgin filter media in a pilot filter column fed by pre-treated manganese containing groundwater was studied for approximately 600 days. Samples of filter media were taken at regular time intervals, and the manganese oxides formed in the coating were analysed by Raman spectroscopy, Electron Paramagnetic Resonance (EPR) and Scanning Electron Microscopy (SEM). From the EPR analyses,...

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Research paper thumbnail of The use of experimental design for the evaluation of the influence of variables on the H2O2/UV treatment of model textile waste water

Dyes and Pigments, 2003

The evaluation of the influence of variables (NaOH, NaCl, urea, intensity of UV irradiation, conc... more The evaluation of the influence of variables (NaOH, NaCl, urea, intensity of UV irradiation, concentration of H2O2 and decoloration time) on the H2O2/UV treatment of textile waste waters by the use of experimental design is described. Experimental design is used to ...

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Research paper thumbnail of The use of artificial neural network (ANN) for modeling of the H2O2/UV decoloration process: part I

Dyes and Pigments, 1999

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Research paper thumbnail of The study of the effects of the variables on H2O2/UV decoloration of vinylsulphone dye: part II

Dyes and Pigments, 2002

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Research paper thumbnail of Manganese removal from groundwater: characterization of filter media coating

Desalination and Water Treatment, 2014

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Research paper thumbnail of Reduction of ripening time of full-scale manganese removal filters with manganese oxide-coated media

Journal of Water Supply: Research and Technology—AQUA, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of manganese removal from over 100 groundwater treatment plants

Journal of Water Supply: Research and Technology—AQUA, 2014

ABSTRACT The aim of this study was to make an inventory of water quality and operational paramete... more ABSTRACT The aim of this study was to make an inventory of water quality and operational parameters which could affect manganese removal through aeration and rapid sand filtration and to establish correlations between these parameters and manganese removal efficiency. The focus of the overview was on manganese removal efficiency in the first aeration-filtration stage of conventional groundwater treatment plants (GWTPs). Data from selected full-scale GWTPs have been collected, and univariate and multivariate statistical analyses were conducted. Multivariate statistics indicated that multiple parameters including NH4+ removal efficiency, iron loading per filter run (FR) and pH of filtrate play a significant role in manganese removal, while other parameters (oxygen concentration in filtrate, filtration rate and empty bed contact time (EBCT)) were found to be of secondary importance. Univariate statistical assessment of the data suggests that very effective manganese removal can be achieved when all of the following conditions are met: NH4+ removal efficiency >85%, pH of filtrate >7.1, iron loading per FR <2.7 kg Fe/m(2), oxygen concentration in filtrate >1 mg O-2/L, filtration rate <10.5 m/h and EBCT >11.5 min.

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Research paper thumbnail of Biological and physico-chemical formation of Birnessite during the ripening of manganese removal filters

Water research, 2015

The efficiency of manganese removal in conventional groundwater treatment consisting of aeration ... more The efficiency of manganese removal in conventional groundwater treatment consisting of aeration followed by rapid sand filtration, strongly depends on the ability of filter media to promote auto-catalytic adsorption of dissolved manganese and its subsequent oxidation. Earlier studies have shown that the compound responsible for the auto-catalytic activity in ripened filters is a manganese oxide called Birnessite. The aim of this study was to determine if the ripening of manganese removal filters and the formation of Birnessite on virgin sand is initiated biologically or physico-chemically. The ripening of virgin filter media in a pilot filter column fed by pre-treated manganese containing groundwater was studied for approximately 600 days. Samples of filter media were taken at regular time intervals, and the manganese oxides formed in the coating were analysed by Raman spectroscopy, Electron Paramagnetic Resonance (EPR) and Scanning Electron Microscopy (SEM). From the EPR analyses,...

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Research paper thumbnail of The use of experimental design for the evaluation of the influence of variables on the H2O2/UV treatment of model textile waste water

Dyes and Pigments, 2003

The evaluation of the influence of variables (NaOH, NaCl, urea, intensity of UV irradiation, conc... more The evaluation of the influence of variables (NaOH, NaCl, urea, intensity of UV irradiation, concentration of H2O2 and decoloration time) on the H2O2/UV treatment of textile waste waters by the use of experimental design is described. Experimental design is used to ...

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Research paper thumbnail of The use of artificial neural network (ANN) for modeling of the H2O2/UV decoloration process: part I

Dyes and Pigments, 1999

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Research paper thumbnail of The study of the effects of the variables on H2O2/UV decoloration of vinylsulphone dye: part II

Dyes and Pigments, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Manganese removal from groundwater: characterization of filter media coating

Desalination and Water Treatment, 2014

Bookmarks Related papers MentionsView impact

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