Continuous electrocoagulation degradation of oily wastewater with Fe 78 Si 9 B 13 amorphous ribbons
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RESEARCH ARTICLE
Continuous electrocoagulation degradation of oily wastewater with Fe78Si9B13 amorphous ribbons Shanshan Zhu 1 & Qingchun Xiang 1 & Chunyan Ma 1 & Yinglei Ren 1 & Keqiang Qiu 1 Received: 1 April 2020 / Accepted: 9 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The oily wastewater was treated by electrocoagulation with Fe78Si9B13 amorphous ribbons as anode and graphite plates as cathode under such processing parameters as different pH values and current density, respectively. The degradation effect on the oily wastewater was characterized by chemical demand oxygen (COD), while the ribbons before and after using were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicate that under the conditions of pH = 3 and current density being 3.125 A/cm2, the optimal COD removal efficiency was obtained to be 73.22%. Compared with the ordinary crystalline iron plate, the COD removal efficiency of resultant wastewater degraded by the amorphous ribbons is more than doubled. Simultaneously, the Fe78Si9B13 amorphous ribbons exhibit good structural stability even after four cycles of using. Keywords Continuous degradation . Electrocoagulation . Electrode . Fe78Si9B13 amorphous ribbon . Oily wastewater . Structural stability
Introduction Oily wastewater is proven to be common both in industry and home life. A particular contaminant of concern is petroleum hydrocarbon present in various types of wastewater coming from shipyards, onshore and offshore industries, and engine rooms of ships (bilge water) (Sekman et al. 2011). This wastewater must be treated before being released into the environment in order to prevent the pollution of water resources, the seashore, soil, and even the air. Among the current treatment technologies available for oily wastewater, electrocoagulation (EC) process has been shown to be an effective and reliable technology that provides an environmentally compatible method for reducing a large variety of pollutants (Ahmadi et al. 2013; Ma and Zhou 2009; Shu et al. 2007; Flores et al. 2018). Furthermore, the EC method is characterized by simple equipment, convenient operation, less chemical additives, small settling volume or sludge volume, and fast sedimentation speed (Ahmadi et al. 2013; Moussa et al. 2016). Responsible Editor: Weiming Zhang * Keqiang Qiu [email protected] 1
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
Therefore, it is one of the important methods for the degradation of wastewater. Up to present, the EC process has attracted great attention in treating industrial wastewater. In order to increase the processing efficiency of wastewater, ECs in a continuous way were often used. Gobbi et al. (2018) used the EC method to separate oil and water, and the results show that the oil removal can reach 98% by using aluminum as electrodes in an upper in and lower out device. Körbahti and Artut (2010) used four pairs of Pt/Ir as anodes to study the effect of
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