Effect of cations on ultrafiltration of humic acid and BSA mixture

• Autorzy: Madaeni S. S. , Sedeh N. S. , Nobili de M.
• Języki publikacji: EN

Abstrakty

EN

In membrane treatment of wastewater containing proteins, humic acid influences the rate and extent of fouling. Cations may increase the tendency of foulants to precipitate due to the changes in intermolecular electrostatic interactions. In this paper, we investigated the effect of cations, including ionic charge and size of hydrated ion, on ultrafiltration of the solutions containing the mixture of HA and bovine serum albumin (BSA). All experiments were carried out in an Amicon batch stirred cell using Amicon XM50, XM300, YM100 ultrafiltration membranes with molecular weight cut-offs of 50 kDa, 300 kDa and 100 kDa, respectively, and Sartorius microfiltration membranes with a nominal pore size of 0.2 mm. Humic substances were extracted from a commercial sample of sphagnum peat from Northern Ireland (Bulrush). In the presence of Ba2+ cations, the HA rejection in the solutions containing HA and BSA was higher compared to the solutions containing Na+ cations. Unlike monovalent cations, divalent cations interact specifically with natural organic matter (NOM) and form metal humic complexes. The binding of divalent cations with natural organic matter is responsible for the development of a dense layer on the membrane surface. Metal cations may also act as a bridge between humic acid and protein. These phenomena result in a higher deposition of substances on the membrane surface leading to lower flux and higher rejection in the presence of divalent metal cations. In addition to the charge, the size of cation plays a role in the deposition process. The solutions containing MgCl2×6H2O are characterizing by higher flux and lower rejection compared to the solution containing BaCl2×2H2O at all ultrafiltration membranes. This phenomenon may be attributed to the size of Mg2+and Ba2+ ions.

Słowa kluczowe

EN

membrane; ultrafiltration; humic acid; BSA; cations

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2005
• Tom: Vol. 31, nr 3-4
• Strony: 93--98
• Opis fizyczny: Bibliogr. 8 poz., tab., rys..

Twórcy

autor

Madaeni S. S.

• Chemical Engineering Department, Razi University, Kermanshah, Iran

autor

Sedeh N. S.

• Chemical Engineering Department, Razi University, Kermanshah, Iran

autor

Nobili de M.

• Chemical Engineering Department, Razi University, Kermanshah, Iran

Bibliografia

• [1] YUAN W., ZYDNEY A.L., Humic acid fouling during ultrafiltration, Environmental Science and Technology, 2000, 34(23), pp. 5043–5050.
• [2] KULOVAARA M., METSAMUURONEN S., NYSTROM M., Effects of aquatic humic substances on a hy-drophobic ultrafiltration membrane, Chemosphere, 1999, 38(15), pp. 3485–3496.
• [3] MANTTARI M., PURO L., NUORTILA-JOKINEN J., NYSTROM M., Fouling effects of polysaccharides and humic acid in nanofiltration, Journal of Membrane Science, 2000, 165(1), pp. 1–17.
• [4] ALEGRET S., ESCALAS A., TERESA M., Potentiometric sensors based on humic substances, Biosensore and Bioelectronics, 1991, 6(7), pp. 609–613.
• [5] SEIDEL A., ELIMELECH, M., Coupling between chemical and physical interactions in natural organic matter (NOM) fouling of nanofiltration membranes: implications for fouling control, Journal of Membrane Science, 2002, 203, pp. 245–255.
• [6] HONG S., ELIMELECH M., Chemical and physical aspects of natural organic matter (NOM) fouling of nanofiltration membranes, Journal of Membrane Science, 1997, 132(23), pp. 159–181.
• [7] DE NOBILI M., BRAGATO G., MORI A., Capillary electrophoretic behavior of humic substance in physical gels, Journal of Chromatography A, 1999, 863, pp. 195–204.
• [8] KELLY S.T., ZYDNEY A.L., Effect of intermolecular thioldisulfide interchange reaction on BSA foul-ing during microfiltration, Biotechnology and Bioengineering, 1994, 44, pp. 972–982.