State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China.
J Hazard Mater. 2010 Oct 15;182(1-3):827-34. doi: 10.1016/j.jhazmat.2010.06.114. Epub 2010 Jul 27.
Electro-coagulation-flotation (ECF) is one of the most promising technologies that offers an attractive alternative to conventional coagulation and flotation. In this study, the effectiveness and mechanisms of algae removal by ECF process using aluminum electrodes was investigated in the presence of Cl(-) ions. The results showed that the addition of Cl(-) ions (1.0, 3.0, 5.0 and 8.0 mM) had a promoting effect on the algae removal in terms of both the cell density and chlorophyll-a, which could be attributed to the following two reasons. Firstly, active chlorine could be generated in the ECF when Cl(-) ions were present. The electrochemically generated active chlorine was demonstrated to be effective for the inactivation of algae cells with the aid of the electric field in the ECF. Secondly, the Cl(-) ions in the algae solution could enhance the release of Al(3+) from the aluminum electrodes in the ECF. Through SEM-EDX analysis, pitting corrosion and alleviated formation of oxide film by Cl(-) ions were observed on the anode surface. When considering that Cl(-) ions are universally present in natural waters, the effects of Cl(-) on ECF process for algae removal are of great significance.
电凝聚-浮选（ECF）是最有前途的技术之一，为传统的混凝和浮选提供了有吸引力的替代方案。在这项研究中，研究了在存在 Cl(-)离子的情况下，使用铝电极的 ECF 工艺去除藻类的效果和机制。结果表明，添加 Cl(-)离子（1.0、3.0、5.0 和 8.0 mM）在细胞密度和叶绿素 a 方面对藻类去除都有促进作用，这可以归因于以下两个原因。首先，当 Cl(-)离子存在时，ECF 中会产生活性氯。电化学产生的活性氯在 ECF 中的电场的辅助下，对藻类细胞的失活是有效的。其次，藻类溶液中的 Cl(-)离子可以促进 ECF 中 Al(3+)从铝电极上的释放。通过 SEM-EDX 分析，在阳极表面观察到点蚀和 Cl(-)离子减轻氧化物膜的形成。考虑到 Cl(-)离子普遍存在于天然水中，Cl(-)对 ECF 去除藻类过程的影响具有重要意义。
