Effect of aeration rate on granular sludge for biodiesel production
CHI Xia, LI An-jie, LI Mei-xi
Key Laboratory of Water and Sediment Sciences of Ministry of Education/State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
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.
迟夏, 李安婕, 李美茜. 曝气量对颗粒污泥制备生物柴油的影响[J]. 中国环境科学, 2018, 38(2): 651-657.
CHI Xia, LI An-jie, LI Mei-xi. Effect of aeration rate on granular sludge for biodiesel production. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 651-657.
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