Electrodialysis of acetate fermentation broths |
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Authors: | U N Chukwu M Cheryan |
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Institution: | (1) Agricultural Bioprocess Laboratory, University of Illinois, 1302 W. Pennsylvania Avenue, 61801 Urbana, IL |
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Abstract: | Electrodialysis (ED) shows good potential for downstream processing of acetate fermentation broths, to separate acetic acid
while unreacted glucose and other nutrients are partially recycled back to the fermenter. With conventional anion- and cation-exchange
membranes, higher current increased acetate flux, water flux, and energy consumption. Multiple ED stacks connected in series
with unequal initial volumes for a batch process maximized acetate concentration in the concentrating stream to 134g/L calcium-magnesium
acetate (CMA) in the fermentation broth at pH 6.8. Back-transport of acetate from the product into the feed stream and water
transport limit the maximum concentration possible. Cost of ED is about $295/ton acetate for the CMA broth. |
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Keywords: | Acetate electrodialysis membranes separation |
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