Arshad Muhammad, Hussain Tariq, Iqbal Munawar, Abbas Mazhar
Department of Basic Sciences, Biochemistry Section, College of Veterinary and Animal Sciences, Jhang Campus 35200, Pakistan.
The University of Lahore, Department of Chemistry, Lahore, Pakistan.
Braz J Microbiol. 2017 Jul-Sep;48(3):403-409. doi: 10.1016/j.bjm.2017.02.003. Epub 2017 Feb 16.
Very high gravity (VHG) technology was employed on industrial scale to produce ethanol from molasses (fermented) as well as by-products formation estimation. The effect of different Brix° (32, 36 and 40) air-flow rates (0.00, 0.20, 0.40, and 0.60vvm) was studied on ethanol production. The maximum ethanol production was recorded to be 12.2% (v/v) at 40 Brix° with 0.2vvm air-flow rate. At optimum level aeration and 40 Brix° VHG, the residual sugar level was recorded in the range of 12.5-18.5g/L, whereas the viable cell count remained constant up to 50h of fermentation and dry matter production increased with fermentation time. Both water and steam consumption reduced significantly under optimum conditions of Brix° and aeration rate with compromising the ethanol production. Results revealed VHG with continuous air flow is viable technique to reduce the ethanol production cost form molasses at commercial scale.
采用超高比重（VHG）技术在工业规模上从糖蜜（发酵后）生产乙醇，并估算副产物的形成。研究了不同糖度（32、36和40）和气流速率（0.00、0.20、0.40和0.60vvm）对乙醇生产的影响。在40糖度和0.2vvm气流速率下，乙醇产量最高，记录为12.2%（v/v）。在最佳通气水平和40糖度的VHG条件下，残余糖水平记录在12.5 - 18.5g/L范围内，而活细胞数在发酵50小时内保持恒定，干物质产量随发酵时间增加。在糖度和通气速率的最佳条件下，水和蒸汽消耗均显著降低，且未影响乙醇生产。结果表明，在商业规模下，采用连续气流的VHG技术是降低从糖蜜生产乙醇成本的可行技术。
