Simultaneous removal of ammonia and phosphate by electrooxidation and electrocoagulation using RuO2-IrO2/Ti and microscale zero-valent iron composite electrode

WATER RESEARCH

卷:169

Article

Sun, Dongni^1,2  Hong, Xiaoting²  Wu, Keming¹  Hui, K. S.³  Du, Yingying²  Hui, K. N.⁴ 

[1] Wuhan Univ Sci & Technol, Hubei Key Lab Efficient Utilizat & Agglomerat Met, Wuhan 430081, Peoples R China

[2] Zhejiang Sci Tech Univ, Dept Chem, Hangzhou 310018, Peoples R China

[3] Univ East Anglia, Fac Sci, Engn, Norwich NR4 7TJ, Norfolk, England

[4] Univ Macau, Inst Appl Phys & Mat Engn, Ave Univ, Taipa, Macau, Peoples R China

关键词: Ammonia;    Phosphate;    Electro-oxidation;    Electrocoagulation;    Zero-valent iron;   

DOI  :  10.1016/j.watres.2019.115239

来源: Elsevier

【 摘 要 】

Electro-oxidation using RuO2-IrO2/Ti plate anode and electrocoagulation using iron plate anode were widely applied to remove ammonia and phosphate in an aquatic environment, respectively. In this work, we designed magnetically bound ZVI microparticles on RuO2-IrO2/Ti plate as a composite electrode for the simultaneous removal of ammonia and phosphate from aqueous solution via combined EO and EC (EO/EC) processes. We present a series of experiments to study such simultaneous removal under an electric field via the EOJEC process. In the electrochemical unit, mZVI-RuO2-IrO2/Ti, mZVI-graphite, and RuO2-IrO2/Ti electrodes were used as anodes. The influence of applied voltage, initial pH, zero-valent iron dosage, reaction temperature, and organic compounds on the EO/EC process was also examined. Ammonia and phosphate could be completely removed at an applied voltage of 10 V, pH of 7, zero-valent iron dosage of 0.1 g, and reaction temperature of 35 degrees C using mZVI-RuO2-IrO2/Ti anode when influent ammonia and phosphate concentrations is 200 and 100 mg L-1 . Ammonia degradation was consistent with pseudo-zero-order kinetic model. The characterization was analyzed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Hence, the mZVI-RuO2-IrO2/Ti electrode can be used for efficient simultaneous removal of ammonia and phosphate. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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