Transition metal activated sulfite[HSO3-/SO32-,S(Ⅳ)]can be used to generate SO4·-to remove organic pollutants from water.It is suggested that S(Ⅳ)serves as a"source"for SO4·-production,also as a"sink"for SO4·-consumption.As a result,sustained-release calcium sulfite(CaSO3)solid powder instead of dissolved sodium sulfite(Na2SO3)solution is used to control the concentration of S(Ⅳ)at a lower level in the reaction system.Study results show that Mn(Ⅲ)-PP/CaSO3 system is better than Mn(Ⅲ)-PP/Na2SO3 system in oxidation capacity and pH applicable scope.At a pH of 8.0,the removal efficiency of organic pollutants by Mn(Ⅲ)-PP/CaSO3 system is 1.73-2.47 times that by Mn(Ⅲ)-PP/Na2SO3 system.
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