Separation performance of sweep gas membrane distillation used in the removal of ammonia from water

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Journal of Beijing University of Chemical Technology ›› 2007, Vol. 34 ›› Issue (1) : 4-8.

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DING ZhongWei;LI ZhaoMan;LIU LiYing;YANG ZuRong

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The performance of sweep gas membrane distillation (SGMD) in the removal of ammonia from water has been evaluated. A mass transfer equation and equations for evaluating mass transfer coefficients and selectivity have been derived by taking into account the dissociation of ammonia in water. SGMD experiments were conducted under various operating conditions in order to measure the ammonia concentration and trans-membrane flux. The mass transfer coefficients and selectivity were calculated from the experimental data. Within the range of experimental parameters employed, mass transfer coefficients of up to 2.2×10^-5m/s and selectivities of up to 14 were obtained. It was found that high feed temperatures result in higher mass transfer coefficients, but lower selecitivity. The feed velocity has very little influence on either mass transfer coefficient or selectivity, but they both can be increased by increasing the velocity of the sweep gas. While mass transfer coefficient and selectivity decrease slightly with rising feed concentration, they can be greatly increased by increasing the feed pH.

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DING ZhongWei;LI ZhaoMan;LIU LiYing;YANG ZuRong. Separation performance of sweep gas membrane distillation used in the removal of ammonia from water [J]. Journal of Beijing University of Chemical Technology, 2007, 34(1): 4-8

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Received	Revised	Published
2006-07-13	1900-01-01	2007-02-15
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2007-02-15

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