This leads to an increase in fermenter throughput, saving in process water, reduced risk of bacterial contamination, and reduction in energy usage for downstream processing and effluent treatment cost. VHG fermentation can hence lead to improvement of the overall process economics with no major alteration to the existing facilities [4].Currently, VHG fermentation has been mostly studied for ethanol production from cereal grains including wheat, corn, barley, rye,sorghum, and finger millet [3,5–10], while its application in root or tuber mash prepared from dicotyledonous plants is still limited.This is mainly due to the highly viscous nature of root and tuber mashes caused by their high pectin content, which leads to entrapment of water in the cell wall matrix [11]. This results in difficulties in mixing and solid–liquid separation leading to incomplete hydrolysis of starch to sugar, which reduces the overall fermentation efficiency [12,13].