Cord-Ruwisch Ralf, Charles Wipa
Department of Environmental Engineering Murdoch University Murdoch Australia.
Department of Agricultural Engineering Syiah Kuala University Banda Aceh Indonesia.
Eng Life Sci. 2018 Jun 1;18(9):635-642. doi: 10.1002/elsc.201700178. eCollection 2018 Sep.
Anaerobic conversion of carbohydrates can generate various end-products. Besides physical parameters such as pH and temperature, the types of carbohydrate being fermented influences the fermentation pattern. Under uncontrolled pH, microbial mixed cultures from activated sludge and anaerobic digester sludge anaerobically produced ethanol from glucose while producing lactic acid from starch conversion. This trend was not only observed in batch trials. Also, continuous chemostat operation of anaerobic digester sludge resulted in the reproducible predominance of ethanol fermentation from glucose solution and lactic acid production from starch. Different feeding regimes and substrate availability (shock load versus continuous feeding) in glucose fermentation under non-controlled pH did not affect the ethanol production as the major end product. Shifts in feed composition from glucose to starch and vice versa result in an immediate change of fermentation end products formation.
碳水化合物的厌氧转化可产生多种终产物。除了pH值和温度等物理参数外，被发酵的碳水化合物类型也会影响发酵模式。在不受控制的pH条件下，来自活性污泥和厌氧消化池污泥的微生物混合培养物在厌氧条件下从葡萄糖产生乙醇，同时从淀粉转化中产生乳酸。这种趋势不仅在分批试验中观察到。此外，厌氧消化池污泥的连续恒化器操作导致从葡萄糖溶液中乙醇发酵和从淀粉中产生乳酸的可重复优势。在不受控制的pH条件下，葡萄糖发酵中不同的进料方式和底物可用性（冲击负荷与连续进料）不会影响作为主要终产物的乙醇产量。进料组成从葡萄糖转变为淀粉，反之亦然，会导致发酵终产物形成立即发生变化。
