College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai 201620, China E-mail:
Water Sci Technol. 2021 May;83(9):2232-2241. doi: 10.2166/wst.2021.098.
Precipitation dechlorination has the advantage of being a simple process with a low cost. However, there are few reports on the effect of cations on dechlorination. In this study, we investigated the effect of cations in high-salt wastewater on the removal of chlorine ions by cuprous chloride precipitation and analysed the corresponding mechanism. A series of investigations revealed that Fe could oxidise sulphite, thereby reducing the removal rate of chlorine ions. The reaction between magnesium and sulphite results in precipitation, which has a slightly adverse effect on the removal of chloride ions. Hexavalent chromium oxidises the chloride ion, resulting in the formation of chlorine gas, which improves the removal rate. Ferrous and manganese, however, do not have a notable effect on chlorine removal.
沉淀脱氯具有工艺简单、成本低的优点。然而，关于阳离子对脱氯效果的影响报道较少。本研究采用氯化亚铜沉淀法处理高盐废水中的氯离子，考察了阳离子对其去除效果的影响，并对相应的作用机制进行了分析。研究表明，废水中的铁离子可将亚硫酸根氧化，从而降低氯离子的去除率；镁离子与亚硫酸根反应生成沉淀，对氯离子去除有轻微的不利影响；六价铬可将氯离子氧化为氯气，提高了氯离子的去除率；而二价铁和二价锰对氯离子去除效果影响不大。
