Study on Fe-C-Al three-phase micro-electrolysis treatment of low concentration phosphorus wastewater

• Published in: Water science and technology Vol. 86; no. 10; pp. 2581 - 2592
• Main Authors: Hu, Baoming, Qi, Quan, Li, Liang, Huan, Yongzhao, Liu, Zheng, Liu, Xuqing
• Format: Journal Article
• Language: English
• Published: London IWA Publishing 15.11.2022
• Subjects: Activated carbon; Aluminium; Aluminum; aluminum-modified micro-electrolysis; Carbon; Chemical reactions; continuous experiment; Efficiency; Electrolysis; Electron microscopy; Fillers; Glucose; Iron; kinetics; low concentration phosphorus wastewater; Metals; Phosphorus; Phosphorus removal; Removal; Scanning electron microscopy; Sensors; Wastewater; X-ray diffraction; China
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2022.370

In this study, the iron-carbon-aluminum (Fe-C-Al) composite filler was prepared by aluminum modification of conventional iron-carbon (Fe-C) micro-electrolysis with a no-burn method. The optimal process conditions for Fe-C-Al three-phase micro-electrolysis treatment of low concentration phosphorus wastewater were determined to be the aluminum metal ratio of 14 wt% and solids dosing of 30 g/L. Under the optimal process conditions, Fe-C-Al three-phase micro-electrolysis was performed for the treatment of low concentration phosphorus wastewater (LCPW) with continuous experiment, while iron-carbon fillers before and after treatment were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the amount of Fe2+ dissolved in the micro-electrolysis determined the micro-electrolysis phosphorus removal effect, Al promoted the dissolution of Fe2+, and the Fe-C-Al filler had a stable phosphorus removal effect, and the average removal efficiency of phosphorus was 67.40%, which is an average improvement of 29.25% compared with the conventional Fe-C filler. The treatment of LCPW by Fe-C-Al three-phase micro-electrolysis is consistent with a first-order kinetic reaction with apparent activation energy of 38.70 kJ·mol−1, which is controlled by the chemical reaction.