Abstract

Bioethanol, as a renewable fuel with a plant base, has a molecule of oxygen in its molecular structure which can improve engine performance and emissions. In the present study, rice hull and orange peel (RHOP) wastes were used to produce bioethanol. First, equal shares of dried rice hulls and orange peels were mixed and milled. Then, 10 L of distilled water was added to the mixture for better hydrolysis and fermentation. Finally, 11 kg of substrate was prepared for hydrolysis to produce sugar. For hydrolysis, three concentrations of sulfuric acid (1, 2 and 3%) were used. The hydrolysis temperature was set at 121 °C for three times of 20, 40 and 60 minutes in the reactor. Finally, 55 g of Saccharomyces cerevisiae was used for fermentation. The fermentation times were set between 4 and 32 hours. The results showed that 22.77 g of bioethanol is obtained per L of RHOP substrate in the best condition. Also, according to the optimum conditions of the experiment, the yield of bioethanol production was 0.295 L/kg of dry matter of RHOP.

摘要

生物乙醇作为一种以植物为基础的可再生燃料，其分子结构中含有一个氧分子，可以提高发动机性能和排放。在本研究中，稻壳和橘皮 (RHOP) 废物用于生产生物乙醇。首先，将等量的干稻壳和橙皮混合并碾磨。然后，向混合物中加入 10 L 蒸馏水，以便更好地水解和发酵。最后，制备 11 kg 底物用于水解生产糖。对于水解，使用三种浓度的硫酸（1、2 和 3%）。水解温度设定在 121 ℃，反应器中 20 分钟、40 分钟和 60 分钟 3 次。最后，55 g酿酒酵母用于发酵。发酵时间设定在 4 到 32 小时之间。结果表明，最佳条件下每L RHOP底物可产生22.77 g生物乙醇。此外，根据实验的最佳条件，生物乙醇的产量为0.295 L/kg RHOP干物质。