Chemical Engineering Department, Babol Noshirvani University of Technology, Babol, Iran.
Department of Chemical Engineering, Islamic Azad University, Shahrood, Iran.
Water Environ Res. 2020 Dec;92(12):2105-2111. doi: 10.1002/wer.1371. Epub 2020 Jul 6.
Despite well-known corrosion inhibition behavior of cathodic protection (CP) system, this process might be a potential hazard to surrounding ecosystem resulted mostly from continuous electrical current which is applied to the adjacent environment and metallic anode dissolution as well. In this research, deepwater CP wells at different locations of Golestan province, Iran, were taken into consideration to evaluate the impact of these protective systems on underground waters from viewpoint of chemical and physicochemical characteristics resulted from anode dissolution. For this purpose, concentration of metallic constituents of the anode as well as the amount of pH, total dissolved solids (TDS), electrical conductivity (EC), and total hardness were determined. On the basis of obtained results, the concentration of Mn, Cr, and Fe in CP well located nearby an industrial district (i.e., 0.087, 0.475, and 8.5 mg/L, respectively) was higher than both WHO and USEPA standards. This fact can be resulted from the position where the well was dug as well as the CP anode dissolution within the deep CP water wells. PRACTITIONER POINTS: The impact of impressed current cathodic protection (ICCP) system on chemical and physicochemical characteristics of underground water has been evaluated. Anode dissolution of ICCP systems influences the water characteristics nearby the anodes. Despite low dissolution rate of high silicon cast iron anodes, their long-term utilization might be harmful for adjacent ecosystem. The amount of heavy metals in underground waters was demonstrated to be influenced by the employment of ICCP system. Both anode dissolution and the geological properties of the Earth`s crust surrounding the wellbore might be responsible for significant increase of heavy metals concentration.
尽管阴极保护 (CP) 系统具有众所周知的腐蚀抑制作用，但由于连续电流被施加到相邻环境和金属阳极溶解，该过程可能对周围生态系统构成潜在危害。在这项研究中，考虑了伊朗戈勒斯坦省不同位置的深海 CP 井，以评估这些保护系统对地下水的影响，从由于阳极溶解而导致的化学和物理化学特性的角度来看。为此，确定了阳极金属成分的浓度以及 pH 值、总溶解固体 (TDS)、电导率 (EC) 和总硬度的总量。根据获得的结果，位于工业区附近的 CP 井（即 0.087、0.475 和 8.5mg/L）中 Mn、Cr 和 Fe 的浓度高于世界卫生组织和美国环保署的标准。这一事实可能是由于井的位置以及深 CP 水井内 CP 阳极的溶解所致。
评估了外加电流阴极保护 (ICCP) 系统对地下水化学和物理化学特性的影响。ICCP 系统的阳极溶解会影响阳极附近的水特性。尽管高硅铸铁阳极的溶解速率较低，但它们的长期使用可能对相邻的生态系统有害。地下水重金属的含量证明受 ICCP 系统的影响。阳极溶解和围绕井筒的地壳地质特性都可能导致重金属浓度的显著增加。
