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Effects of CO32–/bicarbonate, Si, and PO43– on Arsenic sorption to HFO
Groundwaters that have elevated arsenic (As) concentrations sometimes have moderate to high ferrous iron concentrations. Soluble As species readily sorb to hydrous ferric oxide (HFO); therefore, conventional water treatment methods that remove soluble iron (Fe) by oxidizing to HFO also remove As. Commonly occurring solutes, including phosphate (PO43–), silica (Si), and carbonate (CO32–), also sorb to HFO, and competition between these substances and As species may interfere with As removal. This study simulated Fe/As removal at the pH values, alkalinities, and concentrations of Si and PO43– typical of central Illinois groundwater. The results suggest that for water with a pH > 7, lowering the pH to 7 can overcome CO32– and Si interferences. Lowering the pH of water containing PO43– improves As removal but not to the degree observed in waters containing CO32– and Si. The Dzombak and Morel surface complexation–diffuse‐layer model fits the sorption data fairly well.
Effects of CO32–/bicarbonate, Si, and PO43– on Arsenic sorption to HFO
Groundwaters that have elevated arsenic (As) concentrations sometimes have moderate to high ferrous iron concentrations. Soluble As species readily sorb to hydrous ferric oxide (HFO); therefore, conventional water treatment methods that remove soluble iron (Fe) by oxidizing to HFO also remove As. Commonly occurring solutes, including phosphate (PO43–), silica (Si), and carbonate (CO32–), also sorb to HFO, and competition between these substances and As species may interfere with As removal. This study simulated Fe/As removal at the pH values, alkalinities, and concentrations of Si and PO43– typical of central Illinois groundwater. The results suggest that for water with a pH > 7, lowering the pH to 7 can overcome CO32– and Si interferences. Lowering the pH of water containing PO43– improves As removal but not to the degree observed in waters containing CO32– and Si. The Dzombak and Morel surface complexation–diffuse‐layer model fits the sorption data fairly well.
Effects of CO32–/bicarbonate, Si, and PO43– on Arsenic sorption to HFO
Holm, Thomas R. (author)
Journal ‐ American Water Works Association ; 94 ; 174-181
2002-04-01
8 pages
Article (Journal)
Electronic Resource
English
Silica , Iron , pH , Modeling , Phosphates , Ferric Chloride , Coagulation , Treatment Plants , Arsenic , Utilities , Computers , Groundwater , Sorption
Adsorption behavior of IO3- by CO32-- and NO3--hydrotalcite
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