De-fluoridation of drinking water by co-precipitation with magnesium hydroxide in electrolysis
De-fluoridation of drinking water by co-precipitation with magnesium hydroxide in electrolysis
复制标题
电解与氢氧化镁共沉淀对饮用水进行除氟
DOI：
10.1080/23311916.2018.1558498
复制
发表时间：
2018
影响因子：
1.9
通讯作者：
Amarasooriya A.A.G.D.
中科院分区：
文献类型：
--
作者：
Kawakami Tomonori;Nishino Miki;Imai Yuki;Miyazaki Hikaru;Amarasooriya A.A.G.D.
氟中毒的诊断，如饮用水和烹饪用水中过量的氟化物引起的牙齿和骨骼氟中毒，在地球仪周围至少25个国家流行;患者人数将以千万计。其他报告估计，世界上有7000多万人患有氟牙症或氟骨症。由于发展中国家的许多人依赖地下水作为饮用水，无法获得任何其他水资源，因此迫切需要从饮用水中去除氟化物。在目前的研究中，使用由碳电极和由膜隔膜隔开的两个电池组成的新型间歇电解系统从井水中去除氟化物（F−），其目标是在发展中国家应用。在恒定电流下，使用具有不同水平的F-和镁（Mg 2+）的合成井水研究F-的去除。随着电解的进行，阴极池中出现Mg（OH）2沉淀，其通过形成络合物与F−共沉淀。不需要化学品，因为已经在井水中的Mg 2+被用于氢氧化镁的沉淀。当Mg 2+浓度为200 mg/L时，随着Mg 2+浓度的增加，F−的去除率逐渐增加，去除率达到80%。溶液中Mg 2+浓度高于50 mg/L时，F−浓度对F−去除率的影响较小。该系统的能力，以实现低于1毫克/升，这是斯里兰卡的饮用水标准的F−浓度，使用斯里兰卡的地下水与典型的F−和Mg 2+浓度进行了检查。井水样本-183个来自阿努拉达普拉和56个来自波隆纳鲁沃地区-被用于估计。该系统对阿努拉达普拉井水和Polonnaruwa井水的处理能力分别为84%和72%。经证实，高百分比的F−浓度超过1 mg/L的井水可以通过电解系统处理，而无需添加任何化学品。
A diagnostic of fluorosis, such as dental and skeletal fluorosis caused by excess fluoride in drinking and cooking water, is endemic in at least 25 countries around the globe; the number of patients would be in the tens of millions. Other reports have estimated that more than 70 million people in the world suffer from dental or skeletal fluorosis. Since many people in developing countries rely on groundwater for their drinking water and are unable to access any other water resources, the removal of fluoride from drinking water is urgently needed. In the current research, fluoride (F−) was removed from well water using a novel batch electrolysis system composed of carbon electrodes and two cells separated by a membrane diaphragm with the goal of its application in developing countries. The removal of F−was investigated using synthesized well water with various levels of F−and magnesium (Mg2+) at a constant current. As the electrolysis progressed, Mg(OH)2precipitation appeared in the cathode cell, which co-precipitated with F−by forming a complex. No chemicals are needed, since the Mg2+already in the well water is utilized for the precipitation of magnesium hydroxide. The F−removal rate gradually increased with the increase of Mg2+concentration up to 80% when the Mg2+concentration was 200 mg/L. The F−concentration slightly affected the F−removal rate above 50 mg/L of Mg2+in the solution. The system’s capability to achieve F−concentration of less than 1 mg/L, which is the Sri Lankan standard for drinking water, was examined using Sri Lankan groundwater with typical F−and Mg2+concentrations. Well-water samples—183 from the Anuradhapura and 56 from the Polonnaruwa regions—were used for the estimation. The system showed high capability as 84% and 72% for Anuradhapura well water and for Polonnaruwa well water, respectively. It was confirmed that a high percentage of well water having F−concentrations of more than 1 mg/L could be treated by the electrolysis system without the addition of any chemicals.