FibEnTech Unit and Department of Chemistry, University of Beira Interior, 6201-001 Covilhã, Portugal.
Unité de Recherche Electrochimie, Matériaux et Environnement (UREME), Faculté des Sciences de Gabès, Université de Gabès, Cité Erriadh, 6072 Gabès, Tunisia.
Chemosphere. 2017 Oct;184:1223-1229. doi: 10.1016/j.chemosphere.2017.06.088. Epub 2017 Jun 20.
The electro-Fenton oxidation of a concentrate from reverse osmosis of a sanitary landfill leachate, with an initial chemical oxygen demand (COD) of 42 g L, was carried out using a carbon-felt cathode and a boron doped diamond anode. The influence of the applied current intensity, initial pH and dissolved iron initial concentration on the electro-Fenton process was assessed. For the experimental conditions used, results showed that the initial pH is the parameter that more strongly influences the current efficiency of the electro-Fenton process, being this influence more pronounced on the oxidation rate than on the mineralization rate of the organic matter. The increase in iron initial concentration was found to be detrimental, since the natural amount of iron present in the effluent, 73 mg L of total iron and 61 mg L of dissolved iron, was sufficient to ensure the electro-Fenton process at the applied intensities - 0.2-1.4 A. For the more favourable conditions studied, initial pH of 3 and natural iron concentration, it was found an increase in the organic load and nitrogen removals with the applied current intensity. For the highest current intensity applied, a COD removal of 16.7 g L was achieved after 8-h experiments.
采用碳纤维阴极和掺硼金刚石阳极对初始化学需氧量（COD）为 42 g/L 的反渗透浓缩液进行电芬顿氧化。评估了施加电流强度、初始 pH 值和溶解铁初始浓度对电芬顿过程的影响。对于所使用的实验条件，结果表明初始 pH 值是对电芬顿过程电流效率影响最大的参数，这种影响在氧化速率上比在有机物矿化速率上更为显著。发现增加铁的初始浓度是不利的，因为废水中存在的天然铁量-总铁 73 mg/L 和溶解铁 61 mg/L-足以确保在施加的强度-0.2-1.4 A 下进行电芬顿过程。对于研究的更有利条件，初始 pH 值为 3 和天然铁浓度，随着施加电流强度的增加，有机负荷和氮去除率也增加。对于施加的最高电流强度，经过 8 小时的实验，COD 去除率达到 16.7 g/L。
