کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
627566 | 1455467 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preliminary design and optimisation of a PEUF process for Cr(VI) removal
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The main purpose of this work is the study of the viability of a polyelectrolyte enhanced ultrafiltration (PEUF) process for the chromate recovery using poly(diallyldimethylammonium chloride) (PDADMAC) as water-soluble polymer. First of all, the interaction between PDADMAC and chromate ions was studied by potentiometric titrations of different poly(acrylic acid) (PAA) solutions in which its acidity constant (pKa) was determined using the Henderson-Hasselbach equation. This interaction is linked to the influence of the presence of PDADMAC and chromate in the PAA pKa value. Next, the operation conditions (pH, temperature and transmembrane pressure) that optimize the membrane hydrodynamic behaviour were studied with ultrafiltration runs in mode operation of total recirculation. Furthermore, working at the operation conditions determined in the previous stage and with solutions of PDADMAC and chromate, the influence of ionic strength on design parameters was studied. Finally, the viability of a chemical method to regenerate the polyelectrolyte, based on the addition of NaCl and subsequent ultrafiltration, was checked. We conclude that this method is not suitable, mainly because of the great amount of water spent in the diafiltration stage necessary to reduce the polyelectrolyte solution chloride concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 223, Issues 1â3, 1 March 2008, Pages 229-237
Journal: Desalination - Volume 223, Issues 1â3, 1 March 2008, Pages 229-237
نویسندگان
Pablo Cañizares, Ángel Pérez, Javier Llanos, Guiomar Rubio,