Currently gluconic acid produced by batch submerged-fermentation using A. niger and Zymomonas mobilis from carbon source glucose syrup of 70○ Brix strength.About 300 kg/m3 of sodium gluconate was produced at the end of the fermentation [61].Fig. 2 shows fermenter liquor containing only sodium gluconate can be purified in different ways depending upon the type of products.For getting technical grade sodium gluconate (98%) purity mycelium from the fermentation was removed by filtration, then decolorized using a granular activated-carbon column, concentrated under vacuum dryer to 40–50% total solids, neutralized to pH 7.5 with NaOH to obtained sodium gluconate and then dried using spray or drum dryer.