MIT2_500s09_hw03

MIT2_500s09_hw03 - MIT OpenCourseWare http://ocw.mit.edu...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 2.500 Desalination and Water Purification Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . MASSACHUSETTS INSTITUTE OF TECHNOLOGY DEPARTMENT OF MECHANICAL ENGINEERING 2.500 Desalination and Water Purification Homework Set #3 Due 9 April 2009 Problem 1: Electrodialysis A total of 325 m 3 /day of an aqueous solution of 3,000 ppm of NaCl is to be desalinated to 400 ppm by electrodialysis, with a 40% conversion of this solution to potable water. The system used has four stages in series; all liquid travels from one stage to the next. Each stage has three parallel stacks with 150 cell pairs in each stack. The fractional desalination (or c out /c in ) will be the same for each stage. The expected current eciency is = 90%. The applied voltage for the first stage is 220 Vdc. Each cell pair has an area of 1,160 cm 2 . Calculate the current density i in mA/cm 2 , the current I in A, and the power...
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This note was uploaded on 02/27/2012 for the course MECHANICAL 2.500 taught by Professor Miriambalaban during the Spring '09 term at MIT.

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MIT2_500s09_hw03 - MIT OpenCourseWare http://ocw.mit.edu...

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