Wu Yong-li, Shi Bao-you, Sun Hui-fang, Zhang Zhi-huan, Gu Jun-nong, Wang Dong-sheng
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2013 Sep;34(9):3480-5.
To understand the processes of corrosion by-product release and the consequent "red water" problems caused by the variation of water chemical composition in drinking water distribution system, the effect of sulphate and dissolved oxygen (DO) concentration on total iron release in corroded old iron pipe sections historically transporting groundwater was investigated in laboratory using small-scale pipe section reactors. The release behaviors of some low-level metals, such as Mn, As, Cr, Cu, Zn and Ni, in the process of iron release were also monitored. The results showed that the total iron and Mn release increased significantly with the increase of sulphate concentration, and apparent red water occurred when sulphate concentration was above 400 mg x L(-1). With the increase of sulfate concentration, the effluent concentrations of As, Cr, Cu, Zn and Ni also increased obviously, however, the effluent concentrations of these metals were lower than the influent concentrations under most circumstances, which indicated that adsorption of these metals by pipe corrosion scales occurred. Increasing DO within a certain range could significantly inhibit the iron release.
为了解饮用水分配系统中因水化学成分变化导致的腐蚀副产物释放过程及随之而来的“红水”问题，在实验室中使用小型管段反应器，研究了硫酸盐和溶解氧（DO）浓度对历史上输送地下水的腐蚀旧铁管段中总铁释放的影响。还监测了铁释放过程中一些低含量金属（如锰、砷、铬、铜、锌和镍）的释放行为。结果表明，总铁和锰的释放量随硫酸盐浓度的增加而显著增加，当硫酸盐浓度高于400mg·L⁻¹时出现明显的红水现象。随着硫酸盐浓度的增加，砷、铬、铜、锌和镍的出水浓度也明显增加，然而，在大多数情况下这些金属的出水浓度低于进水浓度，这表明这些金属被管道腐蚀垢吸附。在一定范围内增加溶解氧可显著抑制铁的释放。
