小球藻高浓度厌氧消化产甲烷实验研究

Experimental Research on Anaerobic Digestion of Chlorella to Produce Methane

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 m L/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。

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 CSTtk 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.