Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2219
Título: Nanofiltration for the treatment of coke plant ammoniacal wastewaters
Autor: Korzenowski, Christa
Minhalma, Miguel
Bernardes, Andrea M.
Ferreira, Jane Zoppas
de Pinho, Maria Norberta
Palavras-chave: Coke plant wastewaters
Ammonium
Cyanides
Nanofiltration
Fractionation
Waste-water treatment
Removal
Thiocyanate
Phenol
Data: 14-Jan-2011
Editora: Elsevier Science BV
Citação: KORZENOWSKI, Christa; MINHALMA, Miguel; BERNARDES, Andrea M.; FERREIRA, Jane Zoppas; de de PINHO, Maria Norberta - Nanofiltration for the treatment of coke plant ammoniacal wastewaters. Separation and Purification Technology. ISSN 1383-5866. Vol. 76, n.º 3 (2011) p. 303-307.
Resumo: This work addresses the treatment by nanofiltration (NF) of solutions containing NaCN and NH(4)Cl at various pH values. The NF experiments are carried out in a Lab-Unit equipped with NF-270 membranes for model solutions that are surrogates of industrial ammoniacal wastewaters generated in the coke-making processes. The applied pressure is 30 bar. The main objective is the separation of the compounds NaCN and NH(4)Cl and the optimization of this separation as a function of the pH. Membrane performance is highly dependent on solution composition and characteristics, namely on the pH. In fact, the rejection coefficients for the binary model solution containing sodium cyanide are always higher than the rejections coefficients for the ammonium chloride model solution. For ternary solutions (cyanide/ammonium/water) it was observed that for pH values lower than 9 the rejection coefficients to ammonium are well above the ones observed for the cyanides, but for pH values higher than 9.5 there is a drastic decrease in the ammonium rejection coefficients with the increase of the pH. These results take into account the changes that occur in solution, namely, the solute species that are predominant, with the increase of the pH. The fluxes of the model solutions decreased with increased pH. (C) 2010 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2219
ISSN: 1383-5866
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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