Effects of operating conditions on membrane charge property and nanofiltration

doi:10.1007/s11705-011-1143-7

Front Chem Sci Eng

2011, Vol. 5

Issue (4) : 492-499 https://doi.org/10.1007/s11705-011-1143-7

RESEARCH ARTICLE

Effects of operating conditions on membrane charge property and nanofiltration

Li XU^1,2(

), Li-Shun DU^1,2, Jing HE³

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; 2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China; 3. Lanpec Technologies Co., Ltd., Tianjin 300072, China

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Abstract

The effects of the operating pressure, cross flow velocity, feed concentration, and temperature on the streaming and Zeta potential of the membranes were studied. The permeate flux and the retention rate under different nanofiltration operating conditions were also investigated. The results show that the higher pressure, feed concentration, temperature, and lower cross flow velocity lead to the higher absolute value of streaming and Zeta potential. The permeate flux of the nanofiltration decreases with the feed concentration and increases with not only the pressure but also the cross flow velocity and temperature. The higher the pressure and the cross flow velocity, the higher the retention rate. The lower feed concentration and higher temperature leads to lower retention rate. The effects of the operating conditions on the permeate flux and the retention rate were explained by the variation of the membrane charge property.

Keywords nanofiltration membrane streaming potential Zeta potential permeate flux retention rate

Corresponding Author(s): XU Li,Email:xuli620@163.com

Issue Date: 05 December 2011

Cite this article:

Li XU,Li-Shun DU,Jing HE. Effects of operating conditions on membrane charge property and nanofiltration[J]. Front Chem Sci Eng, 2011, 5(4): 492-499.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1143-7
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I4/492

Fig.1 1,16 Temperature control device; 2,3 Pressure gauge; 4, 9, 11,13 Regulating valve; 5 Regulated DC power supply; 6 Membrane pool; 7 Rotermeter; 8 Computer; 10 Beaker; 12 Electronic balance; 14 Screw pump; 15 Feed liquid trough
Schematic diagram of the nanofiltration device

Fig.2 Variations of the permeate flux and streaming potential with time ( = 1.0 × 10 mol·m, = 0.05 m·s, Δ = 1.2 MPa, = 40°C)

Fig.3 Effect of pressure on the streaming and Zeta potential ( = 1.0 × 10 mol·m, = 0.05 m·s, = 40°C)

Fig.4 Effect of cross flow velocity on the streaming and Zeta potential ( = 1.0 × 10 mol·m, Δ = 1.2 MPa, = 40°C)

Fig.5 Effect of feed concentration on the streaming and Zeta potential (Δ = 1.2 MPa, = 0.05 m·s, = 40°C)

Fig.6 Effect of feed concentration on the streaming and Zeta potential ( = 1.0 × 10 mol·m, Δ = 1.2MPa, = 0.05m·s)

Fig.7 Effect of pressure on permeate flux of SG membrane ( = 1.0 × 10 mol·m, = 0.05m·s, = 40°C)

Fig.8 Effect of pressure on penetrating fluid concentration and retention rate ( = 1.0 × 10 mol·m, = 0.05 m·s, = 40°C)

Fig.9 Effect of cross flow velocity on permeate flux ( = 1.0 × 10mol·m, Δ = 1.2 MPa, = 40°C)

Fig.10 Effect of cross flow velocity on penetrating fluid concentration and retention rate ( = 1.0 × 10 mol·m, Δ = 1.2 MPa, = 40°C)

Fig.11 Effect of feed concentration on permeate flux ( = 0.05 m·s, Δ = 1.2 MPa, = 40°C)

Fig.12 Effect of feed concentration on penetrating fluid concentration and retention rate ( = 0.05 m·s, Δ = 1.2 MPa, = 40°C)

Fig.13 Effect of temperature on permeate flux ( = 1.0 × 10 mol·m, = 0.05 m·s, Δ = 1.2 MPa)

Fig.14 Effect of temperature on penetrating fluid concentration and retention rate ( = 1.0 × 10 mol·m, = 0.05 m·s, Δ = 1.2 MPa)

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