Separation and Recycling of Concentrated Heavy Metal Wastewater by Tube Membrane Distillation Integrated with Crystallization
Lou, Xiang-Yang (General Research Institute for Nonferrous Metals)
Xu, Zheng (GRINM Resources and Environmental Tech. Co.)
Bai, An-Ping (Beijing Vocational College of Labor and Social Security)
Resina Gallego, Montserrat (Universitat Autònoma de Barcelona. Departament de Química)
Ji, Zhong-Guang (GRINM Resources and Environmental Tech. Co.)

Fecha:	2020
Resumen:	Tube membrane distillation (MD) integrated with a crystallization method is used in this study for the concurrent productions of pure water and salt crystals from concentrated single and mixed system solutions. The effects of concentrated Zn 2+ and Ni 2+ on performance in terms of membrane flux, permeate conductivity, crystal recovery rates, and crystal grades are investigated. Preferred crystallization and co-crystallization determinations were performed for mixed solutions. The results revealed that membrane fluxes remained at 2. 61 kg·m −2 ·h −1 and showed a sharp decline until the saturation increased to 1. 38. Water yield conductivity was below 10 μs·cm −1. High concentrated zinc and nickel did not have a particular effect on the rejection of the membrane process. For the mixed solutions, membrane flux showed a sharp decrease due to the high saturation, while the conductivity of permeate remained below 10 μs·cm −1 during the whole process. Co-crystallization has been proven to be a better method due to the existence of the SO 2− common-ion effect. Membrane fouling studies have suggested that the membrane has excellent resistance to fouling from highly concentrated solutions. The MD integrated with crystallization proves to be a promising technology for treating highly concentrated heavy metal solutions.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Wastewater treatment ; Membrane distillation ; Crystallization ; Heavy metals ; Concentrated solutions ; Membrane fouling
Publicado en:	Membranes, Vol. 10, Num. 1 (January 2020) , art. 19, ISSN 2077-0375

DOI: 10.3390/membranes10010019
PMID: 31968616

13 p, 3.9 MB

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