In the present study, electrocoagulation (EC) with iron electrodes along with adsorption by activated alumina has been evaluated as a treatment process for arsenic removal from groundwater. Batch scale experiments were performed with iron electrodes to assess the removal efficiency of electrocoagulation. The effects of inter-electrode distance and electro-charge loading (ECL) were evaluated on arsenic removal. EC was able to decrease the arsenic concentration in the aqueous phase below 10 ppb at ECL of 60 coulomb/L with 1 cm inter-electrode distance. The optimal condition was obtained by Response Surface Methodology (RSM) with the help of central composite design (CCD). The regression equation and analysis of variance were originated using Design-Expert software and F value (131.56), p-value (<0.05), and desirability value of 1 were obtained for the optimized model. Activated alumina adsorption has also been shown to be a promising arsenic removal technology (As⁵⁺) with 15 min of equilibrium time. An arsenic removal system was designed with EC unit, sand filter, and activated alumina column in series for field application. The field unit was able to deliver safe water to the local community. During the operation, the electrodes were passivated, and calcium-based deposition was found on the cathodes. Periodic electrode reversal was able to minimise the passivation. Due to the accumulation of ferric hydroxide flocs, the pores of the filter bed become clogged and they must be cleaned by backwashing. The Backwash system should be continued until the water runs clear. An arrangement of a suitable soak pit is made to contain the backwash water avoiding any environmental contamination. EC could be able to deliver safe water locally in rural areas at affordable prices due to its high efficiency and low operation and maintenance costs.

在本研究中，铁电极电凝 (EC) 以及活性氧化铝吸附已被评估为从地下水中去除砷的处理工艺。用铁电极进行批量实验以评估电凝聚的去除效率。评估了电极间距离和电荷负载 (ECL) 对砷去除的影响。在 ECL 为 60 库仑/升且电极间距为 1 cm 时，EC 能够将水相中的砷浓度降低到 10 ppb 以下。通过响应面法（RSM）在中心复合设计（CCD）的帮助下获得了最佳条件。回归方程和方差分析使用 Design-Expert 软件和 F 值 (131.56), p- 值（<0.05），优化模型的期望值为 1。活性氧化铝吸附也被证明是一种很有前途的除砷技术（As ⁵⁺) 有 15 分钟的平衡时间。设计了一套由 EC 单元、砂滤器和活性氧化铝柱串联的砷去除系统，用于现场应用。现场单位能够为当地社区提供安全的水。在操作过程中，电极被钝化，并且在阴极上发现了钙基沉积物。周期性的电极反转能够使钝化最小化。由于氢氧化铁絮状物的堆积，滤床的孔隙被堵塞，必须通过反冲洗来清洗。反洗系统应继续进行，直到水流清为止。安排了一个合适的浸泡坑来容纳反洗水，避免任何环境污染。