This study aimed to define the optimum weight ratio between Berea Red sand (BRS)/zero-valent iron (ZVI) combinations to be used in the treatment of nitrate contaminated water. The effect of competing ions (phosphate and sulfate) on the nitrate removal efficiency of the best performing BRS-ZVI w/w ratio was also assessed. To achieve this objective, batch tests were performed under anoxic and acidic conditions (pHi = 4.5), using two combinations: 50%BRS-50%ZVI (w/w) and 25%BRS-75%ZVI (w/w), as well as 100%ZVI as a control. BRS and ZVI had 1 to 2-mm grain size. pH and nitrogen species were tested during these batch tests. Kinetic analysis was also carried out. While the removal efficiencies of 100%ZVI and 25%BRS-75%ZVI (w/w) were 70.2% and 83.1%, respectively, the experimental results showed that the combination of 50%BRS-50%ZVI (w/w) had the highest nitrate removal efficiency (99.5%), implying a synergistic effect between BRS and ZVI. Likewise, the kinetic analysis showed that the nitrate removal rate (k) increased as the BRS mass in the BRS-ZVI combination increased. Furthermore, the presence of phosphate and sulfate negatively affected the nitrate removal performance of the 50%BRS-50%ZVI combination, which was the best performing weight ratio. However, this weight ratio still showed high nitrate removal capacities in the presence of phosphate and sulfate, respectively. The 50%BRS-50%ZVI combination demonstrated to be the optimum among the used ones. However, further investigation in a large-scale reactor on this combination is recommended for further optimization of its performance.

这项研究旨在确定用于处理硝酸盐污染水的Berea红砂（BRS）/零价铁（ZVI）组合之间的最佳重量比。还评估了竞争离子（磷酸盐和硫酸盐）对最佳性能的BRS-ZVI w / w比的硝酸盐去除效率的影响。为了实现这一目标，批量测试下缺氧和酸性条件下（pH下进行我 = 4.5），使用两种组合：50％BRS-50％ZVI（w / w）和25％BRS-75％ZVI（w / w），以及100％ZVI作为对照。BRS和ZVI的晶粒尺寸为1-2毫米。在这些分批测试中测试了pH和氮的种类。还进行了动力学分析。100％ZVI和25％BRS-75％ZVI（w / w）的去除效率分别为70.2％和83.1％，但实验结果表明50％BRS-50％ZVI（w / w）的组合去除率具有最高的硝酸盐去除效率（99.5％），表明BRS和ZVI之间具有协同作用。同样，动力学分析表明，硝酸盐去除率（k）随着BRS-ZVI组合中BRS质量的增加而增加。此外，磷酸盐和硫酸盐的存在对50％BRS-50％ZVI组合的硝酸盐去除性能产生负面影响，这是性能最佳的重量比。然而，在磷酸盐和硫酸盐的存在下，该重量比仍然显示出高的硝酸盐去除能力。50％BRS-50％ZVI组合被证明是所使用的最佳组合。但是，建议在大型反应器中对该组合进行进一步研究，以进一步优化其性能。