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.

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。