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Enhancement of Zinc Ion Removal from Water by Physically Mixed Particles of Iron/Iron Sulfide
Water, Air, & Soil Pollution ( IF 3.8 ) Pub Date : 2021-01-06 , DOI: 10.1007/s11270-020-04966-4
Yuya Kamba , Miharu Ueta , Md. Azhar Uddin , Yoshiei Kato

Zinc (Zn) removal by physically mixed particles of zero-valent iron (Fe) and iron sulfide (FeS) was investigated as one technology for Zn removal from waste groundwater. The effects of the Fe/FeS mass ratio, including a single Fe and FeS particles, and pH on changes in the concentrations of Zn, Fe, and S were examined by a batch test and column tests, and the mechanism of Zn elimination was discussed. Among all the mixing fractions of Fe and FeS, Zn was eliminated most effectively by 3Fe/7FeS (mass ratio of Fe/FeS = 3/7). The Zn removal rate decreased in the order of 3Fe/7FeS, FeS, and Fe, whereas the Fe concentration decreased in the order of Fe, FeS, and 3Fe/7FeS. The S concentration of FeS was larger than that of 3Fe/7FeS. The Zn removal rate by physically mixed 3Fe/7FeS particles was enhanced by a local cell reaction between the Fe and FeS particles. The electrons caused by Fe corrosion moved to the FeS surface and reduced the dissolved oxygen in the solution. Zn2+, Fe2+, and OH ions in the solution were then coprecipitated on the particles as ZnFe2(OH)6 and oxidized to ZnFe2O4. Moreover, Zn2+ was sulfurized as ZnS by both the Fe/FeS mixture and the simple FeS particles. The Zn removal rate increased with increasing pH in the range from pH 3 to 7. From a kinetic analysis of Zn removal, the rate constant of anode (Fe)/cathode (FeS) reaction was almost the same as that of ZnS formation and slightly larger than that of Fe alone.



中文翻译:

铁/硫化铁的物理混合颗粒增强水中锌离子的去除

研究了通过物理混合零价铁(Fe)和硫化铁(FeS)去除锌(Zn)作为一种从废水中去除锌的技术。通过分批试验和柱试验研究了Fe / FeS质量比(包括单个Fe和FeS颗粒)和pH对Zn,Fe和S浓度变化的影响,并讨论了Zn消除的机理。在Fe和FeS的所有混合组分中,Zn被3Fe / 7FeS(Fe / FeS的质量比= 3/7)最有效地消除。Zn去除率以3Fe / 7FeS,FeS和Fe的顺序降低,而Fe浓度以Fe,FeS和3Fe / 7FeS的顺序降低。FeS的S浓度大于3Fe / 7FeS。物理混合3Fe / 7FeS颗粒的Zn去除率通过Fe和FeS颗粒之间的局部电池反应而提高。由铁腐蚀引起的电子移动到FeS表面并还原了溶液中的溶解氧。锌2+,铁2+,和OH -在溶液中的离子然后共沉淀在颗粒上作为的ZnFe 2(OH)6和氧化的ZnFe 2 Ò 4。此外,Fe / FeS混合物和简单的FeS颗粒均将Zn 2+硫化为ZnS。在pH范围从3到7的范围内,Zn的去除速率随pH的增加而增加。从动力学上分析Zn(Fe)/ Cadode(FeS)反应的速率常数与ZnS形成的速率常数几乎相同,并且略有不同。比单独的铁大。

更新日期:2021-01-07
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