Abstract
Abstract Vitamin B12 wastewater, as a pharmaceutical wastewater, is difficult to treat due to its high concentrations of bioresistant organic matters, salinity, chromaticity, and poor biodegradability. A laboratory-scale microelectrolysis (ME) process with aeration device was designed to treat this wastewater. Our results suggested that, under obtained optimal condition of hydraulic retention time of 80 min, initial pH of 3, and air/water ratio of 100:1, the removal efficiency of chemical oxygen demand, ammonia nitrogen (NH3—N), and chromaticity in the wastewater by ME process was achieved by 43.9%, 7.9%, and 82.6%, respectively. Organic matter with benzene ring was largely removed or degraded and, therefore, C = C and C = O bonds were destroyed, and substituents of aromatic rings contained more aliphatic chains after treatment by ME process. All wastewater samples were divided into three parallel factor analysis components: one protein-like (component 1 [C1]) and two humic-like components (component 2 [C...
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