Arsenic contamination in drinking water is a great concern in different regions of the world as well as in India. Several technologies have been investigated to remove arsenic from water, such as coagulation and co-precipitation, ion exchange, adsorption, and reverse osmosis. In the present research, electrocoagulation with iron electrodes has been assessed as a treatment technology for arsenic removal from groundwater to reach concentrations below 0.01 mg/L (WHO limit) and which is technically effective, affordable for the local area, and easy to operate and maintain. Electrochemically generated iron is converted to hydrated ferric oxide within the contaminated water, which takes up the arsenic from water. A downstream filtration unit (sand or activated alumina) is applied to remove ferric hydroxide flocs produced during the process. The laboratory experiments were conducted in a batch reactor using iron plates as electrodes with monopolar configuration to study the effects of initial pH and electro-charge loading (ECL) on arsenic removal. The optimum operating condition was observed for an electro-charge loading of 25–30 Coulombs/L at pH 7.0 and an initial arsenic concentration of 0.2 mg/L. Two field trials were implemented in West Bengal after suitably designing the electrocoagulation system. Arsenic removal was significant (75–80%) delivering safe water with arsenic below 0.01 mg/L (acceptable limit). Passivation of the electrodes occurred during the operation and calcium-based (including iron) deposition was observed on the cathodes. Passivation is avoidable after running regular polarity reversal of the electrodes.

饮用水中的砷污染在世界不同地区以及印度引起了极大关注。已经研究了几种从水中去除砷的技术，例如凝结和共沉淀，离子交换，吸附和反渗透。在本研究中，使用铁电极进行电凝已被评估为一种用于去除地下水中砷的浓度达到0.01 mg / L（WHO限值）以下的处理技术，该技术是技术有效的，在当地可负担得起，并且易于操作和操作。保持。电化学产生的铁在受污染的水中转化为水合氧化铁，从水中吸收砷。应用下游的过滤装置（砂或活性氧化铝）以去除工艺过程中产生的氢氧化铁絮凝物。实验室实验是在间歇反应器中进行的，使用铁板作为单极性电极作为电极，以研究初始pH和电荷负荷（ECL）对除砷的影响。在pH 7.0时，荷电负荷为25-30 Coulombs / L，初始砷浓度为0.2 mg / L时，观察到最佳操作条件。在适当设计电凝系统后，在西孟加拉邦进行了两次现场试验。提供安全的水且砷含量低于0.01 mg / L（可接受的限度）时，砷的去除率很高（75-80％）。在操作过程中发生电极钝化，并且在阴极上观察到钙基（包括铁）沉积。在电极进行规则的极性反转后，可以避免钝化。