4. In water treatment systems, Arsenic (As) removal is achieved generally by two consecutive processes. Dissolved As(III

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4 In Water Treatment Systems Arsenic As Removal Is Achieved Generally By Two Consecutive Processes Dissolved As Iii 1 (65.64 KiB) Viewed 82 times

4. In water treatment systems, Arsenic (As) removal is achieved generally by two consecutive processes. Dissolved As(III) is first oxidized to As(V), which then is removed by an ion- exchange process. In order to ensure that more than 99% of total As is oxidized before the ion- exchange process, what is the minimum target pe of the water at pH 6.7? (40 pt) AsO4 + 2H+ + 2e → ASO3³ + H₂O peº = 2.64 As species and the pK values are as follows: H3ASO4, H₂ASO4, HASO4, AsO4³, H3ASO3, H₂ASO3, HASO3²-, ASO3³- pKal pka2 pka3 As(III) 9.23 12.10 13.41 As(V) 2.24 6.76 11.60