Experimental batch study demonstrates multi-pollutant removal using liquid ferrate in flue-gas desulfurization wastewater, highlighting its viability for industrial water pretreatment.
The pretreatment of flue-gas desulfurization (FGD) wastewater directly affects the subsequent treatment effect of water. Liquid ferrate(VI) was used for the first time in the pretreatment of FGD wastewater. Influential factors including ferrate(VI) dosage and dosing method were investigated by batch tests. The results show that when the dosage of Na 2 FeO 4 is 1.0 g/L, the removal rate of Mg 2+ , Ca 2+ , SO 4 2-, NH 4 + and chemical oxygen demand were 99.80%, 83.09%, 7.24%, 28.72% and 26.46%, respectively. The strong oxidizing property of the liquid ferrate, the alkali therein, and the co-precipitation of the product promote the removal of these substances. Morphologic and element analysis confirmed that the composition of precipitates were Fe 16 O 16 (SO 4 ) 2 (OH) 12 nH 2 O, FeO(OH), CaSO 4 and Mg(OH) 2 . This paper provides a demonstration and theoretical guidance for the application of ferrate(VI) in FGD wastewater pretreatment.
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Zhang et al. (2023) studied this question.
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