The chlorella that has been used mostly in microalgae researches,was selected to study its productivity of methane. Biochemical Methane Potential test (BMP) indicated that the methane yield reached 461 mL/g. Microalgae biomass was easily degraded by anaerobic microorganisms,and organics (including microalgae oils,proteins,carbohydrates and other cellular components,and the liquid organic) can be completely converted into biogas. Under semi-continuous operation condition with theorganic loading rate of 2.25 kg/(m3·d) in CSTR reactor,the gas production rate of chlorella reached 1.1 m3/(m3·d),with methane content around 62% and the organic matter degradation rate around 57.7%, respectively. Chlorella was easily degraded under anaerobic conditions,and the process was stable. The entire system had a high energy conversion efficiency.%选择了微藻研究中使用较多的小球藻,对其产甲烷性能进行了研究。厌氧消化产甲烷潜能(BMP)实验结果表明:小球藻厌氧消化产甲烷潜势达到461 mL/g。微藻生物质容易被厌氧微生物降解,能够将有机质(包括微藻油脂、蛋白质、糖类等细胞成分以及藻液中有机物)充分转化成沼气。半连续实验结果表明:运行 CSTR 反应器负荷率在2.25 kg/(m3·d)条件下,小球藻厌氧消化容积产气率达到1.1 m3/(m3·d),沼气中甲烷平均含量为62%,有机物 VS 降解率57.7%。小球藻易于在厌氧条件下降解且工艺运行稳定,整个系统具有较高的能源转化效率。
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