Effects of ceramsite on methane and hydrogen sulphide productions from macroalgae biomass

Abstract

The easy acidification and high hydrogen sulfide (H₂S) production during anaerobic digestion of macroalgae limited its application in biomethane production. In order to investigate the effects of ceramsite on methane and H2S productions during anaerobic digestion of macroalgae, batch experiments of Macrocystis pyrifera were carried out. Four groups named C0, C1, C2 and C3 added with 0, 1.5, 3.0 and 4.5 g/g_substrate of ceramsite, respectively, were studied and compared. The highest cumulative methane yield of 286.3 mL/g_substrate is obtained in C2, which is 40.11% higher than that of C0. The cumulative H₂S yields of C1, C2 and C3 are 32.67%, 44.66% and 53.21% lower than that of C0, respectively. Results indicate that ceramsite addition permits higher methane yields, shorter lag-phase time and lower H₂S yields during anaerobic digestion of Macrocystis pyrifera.

摘要

巨藻厌氧发酵过程存在易酸化、硫化氢产量高的问题,大大限制了其在生物制甲烷方面的应用。 为了研究陶粒对巨藻厌氧发酵的甲烷和硫化氢生产的影响,开展了以巨藻Macrocystis pyrifera 生物质 为底物的批次发酵试验。实验分4 组,C0、C1、C2 和C3,分别添加了0、1.5、3.0、4.5 g/g_substrate 的 陶粒。其中,C2 组得到了最高的甲烷累积产量,为286.3 mL/g_substrate,比C0 组提高了40.11%。C1、 C2、C3 组的硫化氢累积产量分别比C0 降低了32.67%、44.66%、53.21%。结果显示,添加陶粒的巨 藻发酵体系甲烷产量提高、延滞期缩短、硫化氢产量降低。