Biogas, a clean and renewable form of energy, could very well substitute for conventional sources of energy (fossil fuels, oil, etc.) which are causing environmental problems. The present work investigates the application of hydrodynamic cavitation (HC) for the pretreatment of biomass with the objective of enhancing biogas production. Effect of different parameters viz.rice straw to water ratio (0.5%, 1%, 2%, 3%, and 4%), operating pressure (1-3 bar), and also treatment time (10-30 min) have been investigated using an orifice plate as a cavitating device. The water displacement method is used for the analysis of the quantity of biogas formation. As we increased the biomass ratio is increased from 0.5 to 3% with the same treatment time 15 min biogas yield also increased from 52 to 345 mL respectively. Combining chemical treatment with hydrodynamic cavitation it has been observed that it gives a maximum (470 mL) of biogas yield as compared to HC alone (360 mL) for the same biomass ratio of 4%. Overall, it has been established that a significant enhancement in the biogas production can be obtained due to the pretreatment using HC which can also be further intensified by combination with chemical treatment.

中文翻译：

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基于气蚀的生物质预处理用于强化沼气生产

沼气是一种清洁和可再生的能源形式，可以很好地替代造成环境问题的传统能源（化石燃料、石油等）。本工作研究了流体动力空化 (HC) 在生物质预处理中的应用，目的是提高沼气产量。不同参数即稻草与水的比例（0.5%、1%、2%、3% 和 4%）、操作压力（1-3 bar）和处理时间（10-30 分钟）的影响使用孔板作为空化装置进行了研究。水置换法用于分析沼气生成量。随着我们的增加，生物量比率从 0.5% 增加到 3%，相同的处理时间 15 分钟沼气产量也分别从 52 增加到 345 mL。已经观察到，将化学处理与流体动力空化相结合，在相同的生物质比率为 4% 的情况下，与单独使用 HC（360 mL）相比，它产生的沼气产量最大（470 mL）。总体而言，已经确定，由于使用 HC 的预处理可以显着提高沼气产量，也可以通过与化学处理相结合进一步加强。