Bananas are widely cultivated in tropical and subtropical countries and about 220 tons of biomass waste is produced per hectare of banana plantation. Banana pseudostem contains nearly 90% of moisture and about 4–5 m³ sap is generated from one ton of dried stem with high chemical oxygen demand(COD) and biological oxygen demand (BOD). The feasibility of using banana sap as a feedstock to produce ethanol is evaluated in this study. Banana sap is obtained by crushing the pseudostems and concentrated ten times and supplementing with other industrial byproducts such as corn steep liquor(CSL), spent wash (SW), and yeast extract (YE) for ethanol production. Acid and alkali hydrolyzes are performed to enhance the sugar levels of the sap before fermentation. Two different strains of Saccharomyces cerevisiae (MTCC170 and MTCC180) are used for fermentation. In general, supplementation of banana sap with industrial byproducts significantly enhanced the ethanol production. The maximum ethanol production (2.5 g ⁻¹) is observed with concentrated banana sap supplemented with 25% SW (v/v) with MTCC170, which is 16‐fold higher than banana sap alone. Theethanol content is also higher in alkali‐hydrolyzed banana sap supplemented with 25% SW compared to control. These results suggest that banana sap can be used as a renewable source to produce ethanol by supplementing with other industrial byproducts.

中文翻译：

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利用香蕉汁作为原料生产生物乙醇

香蕉在热带和亚热带国家被广泛种植，每公顷香蕉种植园产生约220吨生物质废物。香蕉假茎含有将近90％的水分，一吨干茎中产生的化学需氧量（COD）和生物需氧量（BOD）高，约产生4–5 m ³汁液。在这项研究中评估了使用香蕉汁作为原料生产乙醇的可行性。香蕉汁可通过以下方法获得：将假茎粉碎并浓缩十次，并补充其他工业副产品，例如玉米浆（CSL），废洗液（SW）和酵母提取物（YE）以生产乙醇。进行酸和碱水解以提高发酵前汁液的糖水平。两种不同的酿酒酵母菌株（MTCC170和MTCC180）用于发酵。通常，用工业副产品补充香蕉汁可显着提高乙醇产量。在浓缩香蕉汁中添加25％SW（v / v）的MTCC170可以观察到最大乙醇产量（2.5 g  ^-1），这比单独的香蕉汁高16倍。与对照相比，添加了25％SW的碱水解香蕉汁中的乙醇含量也更高。这些结果表明，香蕉汁可通过补充其他工业副产品而用作可再生资源来生产乙醇。