Yongliang WANG, Xiaoling YANG, Yongxia DONG, et al. Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic[J]. CIESC Journal, 2019, 70(9): 3511-3516.
Yongliang WANG, Xiaoling YANG, Yongxia DONG, et al. Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic[J]. CIESC Journal, 2019, 70(9): 3511-3516.DOI: 10.11949/0438-1157.20190454.
In the process of catalytic oxidation of Fe(Ⅱ) co-precipitated arsenic by hydrogen peroxide
different pH adjustments were used to adjust the pH of the solution. The effects of different pH adjustments on the precipitation of arsenic in wastewater and the properties of precipitated slag were studied. The results show that the pH adjustments of Na2CO3 and CaO are beneficial to the removal of arsenic from wastewater
and the arsenic in the coprecipitates is mainly in the form of amorphous bulk particles. When Na2CO3 is used as the pH adjustment
it is most favorable to the growth of particle size
the size of precipitates is the largest
but the stability of arsenic is the worst
and it is easier to release from the slag. The particle size of the precipitates obtained by CaO is relatively small due to the existence of CaSO4 rod-like particles
but the existence form of arsenic is the most stable