Vinegar and Citric Acid
For the recovery of citric acid after fermentation, Ca(OH)2 is added to the slurry to

precipitate calcium phosphate
precipitate calcium citrate
precipitate calcium sulphate
precipitate calcium carbonate

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Vinegar and Citric Acid
Vinegar is typically produced in fed batch reactors because

acetic acid bacteria tend to ferment at high ethanol concentrations
a fed batch reactor can be used to maintain low ethanol concentrations
All of these
a fed batch reactor can be used to maintain low acetic acid concentrations

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