Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Soluble arsenic removal at water treatment plants
Conventional treatment steps can be extremely effective at removing arsenic.
Arsenic “profiles” were obtained from full‐scale conventional treatment (coagulation, Fe–Mn oxidation, or softening) plants, facilitating testing of theories regarding arsenic removal. Soluble As(V) removal efficiency was controlled primarily by pH during coagulation, by Fe+2 oxidation and Fe(OH)3 precipitation during Fe–Mn oxidation, and by Mg(OH)2 formation during softening. Insignificant soluble As(V) removal occurred during calcite precipitation at softening plants or during Mn+2 oxidation–precipitation at Fe–Mn oxidation plants. The extent of soluble As(V) removal during coagulation and softening treatments was lower than expected. Somewhat surprisingly, during coagulation As(V) removal efficiencies were limited by particulate aluminum formation and removal, because much of the added coagulant was not removed by 0.45‐μm‐pore‐size filters. At one utility, reducing the coagulation pH from 7.4 to 6.8 (at constant alum dose) improved removal of particulate aluminum, thereby enhancing soluble As(V) removal during treatment.
Soluble arsenic removal at water treatment plants
Conventional treatment steps can be extremely effective at removing arsenic.
Arsenic “profiles” were obtained from full‐scale conventional treatment (coagulation, Fe–Mn oxidation, or softening) plants, facilitating testing of theories regarding arsenic removal. Soluble As(V) removal efficiency was controlled primarily by pH during coagulation, by Fe+2 oxidation and Fe(OH)3 precipitation during Fe–Mn oxidation, and by Mg(OH)2 formation during softening. Insignificant soluble As(V) removal occurred during calcite precipitation at softening plants or during Mn+2 oxidation–precipitation at Fe–Mn oxidation plants. The extent of soluble As(V) removal during coagulation and softening treatments was lower than expected. Somewhat surprisingly, during coagulation As(V) removal efficiencies were limited by particulate aluminum formation and removal, because much of the added coagulant was not removed by 0.45‐μm‐pore‐size filters. At one utility, reducing the coagulation pH from 7.4 to 6.8 (at constant alum dose) improved removal of particulate aluminum, thereby enhancing soluble As(V) removal during treatment.
Soluble arsenic removal at water treatment plants
McNeill, Laurie S. (Autor:in) / Edwards, Marc (Autor:in)
Journal ‐ American Water Works Association ; 87 ; 105-113
01.04.1995
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Coagulation , Arsenic , Oxidation , Softening
Arsenic removal at llinois iron removal plants
| Wiley | 2008
Arsenic Removal from Effluents of Copper Plants
| Springer Verlag | 1998
ARSENIC REMOVAL FROM POTABLE WATER
| Wiley | 1971
Arsenic - a Review. Part II: Oxidation of Arsenic and its Removal in Water Treatment
| Online Contents | 2003