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Removal of reactive red 195 from dyeing wastewater using electro-Fenton process in a cell with oxygen sparged fixed bed electrodes
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2021-03-31 , DOI: 10.1016/j.jwpe.2021.102042
A.A. Elbatea , S.A. Nosier , A.A. Zatout , I. Hassan , G.H. Sedahmed , M.H. Abdel-Aziz , M.A. El-Naggar

This research focuses on the use of electro-Fenton processes for degradation of reactive red 195, the degradation is achieved by reactions with hydroxyl radicals (O˙H) which are produced from Fenton reaction using a new O2 sparged electrochemical reactor consisting of fixed bed cathode made of carbon cylinders and a horizontal array of closely packed steel screens anode. Variables studied were current density, initial dye concentration, oxygen superficial velocity, and number of graphite layers (bed thickness). Color removal efficiency reached 100 % and chemical oxygen demand (COD) removal reached 96 % for the dye initial concentration of 50 ppm at current density =2 mA/cm2, superficial oxygen velocity =0.012 cm/s, 60 miutes contact time, a cell with a three layer of graphite cylinders fixed bed cathode was used. Under these conditions, the energy consumption was found to be 17 kW⋅h/kg of removed dye, and the electrical cost of dye removal ≈ 0.85 $/ kg dye removed. Kinetics study revealed that dye removal takes place through a first-order reaction. The merits of the present reactor compared to the reactors used in previous studies were highlighted.



中文翻译:

在带有氧气喷射固定床电极的电解槽中,采用电子芬顿工艺从印染废水中去除活性红195

这项研究集中在使用电子芬顿工艺降解活性红195上,该降解是通过与羟基自由基的反应实现的(Ø˙H)是由芬顿反应使用新型O 2鼓泡电化学反应器生产的,该反应器由固定床阴极(由碳瓶制成)和水平排列的紧密排列的钢丝网阳极组成。研究的变量是电流密度,初始染料浓度,氧气表观速度和石墨层数(床层厚度)。在电流密度= 2 mA / cm 2时,染料初始浓度为50 ppm时,脱色效率达到100%,化学需氧量(COD)去除达到96%,表观氧气速度= 0.012cm / s,60分钟的接触时间,使用具有三层石墨圆柱体固定床阴极的电池。在这些条件下,发现能量消耗为17 kW·h / kg去除的染料,去除染料的电成本≈0.85 $ / kg去除染料。动力学研究表明,染料的去除是通过一级反应进行的。与以前的研究中使用的反应器相比,本反应器的优点得到了强调。

更新日期:2021-04-01
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