曝气量对颗粒污泥制备生物柴油的影响

以处理葡萄糖废水的好氧颗粒污泥为研究对象，考察了不同曝气量对颗粒污泥的菌群结构以及后续制备生物柴油的影响.研究结果表明，不同曝气条件下的颗粒污泥形态以及细菌，真菌的菌群结构存在明显差异，曝气量为167L/（min·m³）时，丝状真菌比例最高（8.57%），且单位生物量的生物柴油产量也最高，达到（48.62 ±1.36）mg/g SS.不同曝气条件下形成不同菌群结构的颗粒污泥，不仅影响了污泥制备生物柴油的产量，其组分也存在明显差异.曝气量为167L/（min·m³）条件下，亚油酸甲酯（C18：2）大幅增加，这可能与该条件下颗粒污泥中出现的酵母菌Dipodascus有关.由此可见，在实际工程中可以通过控制曝气量来提高生物柴油产量和调节其组分结构.

Effect of aeration rate on granular sludge for biodiesel production

Aerobic granular sludge for sugar-containing wastewater treatment is a promising raw material for biodiesel production, which also could reduce the environmental contamination of wastewater discharge and convert excessive granular sludge into valuable resources. In this study, the effect of aeration rate on the biodiesel production from granular sludge was investigated. The results indicated that granules cultivated at different aeration rates had different morphologies and the microbial structures of bacteria and fungi. The biodiesel yield reached the highest level(48.62 ±1.36)mg/g SS] when the aeration rate was 167L/(min·m³). The aeration rate with 167L/(min·m³) resulted in the dominance of the white filamentous fungi Dipodascus (8.57%) in granular sludge, thereby enhancing the lipid accumulation of granular sludge and changing the biodiesel constituent produced from the sludge. The growth of Dipodascus in granular sludge possibly led to a great increase in linoleic acid (C18:2). Obviously, the biomass and microbial community could be affected by aeration rate which determined the content and constituent of FAMEs produced from granular sludge. The yield and constituent of biodiesel produced from excessive granular sludge could be improved by controlling the aeration conditions of granulation system in actual applications.