Stability of aerobic granular sludge under condition of low influent C/N ratio: Correlation of sludge property and functional microorganism.
Stability of aerobic granular sludge under condition of low influent C/N ratio: Correlation of sludge property and functional microorganism.
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DOI：
10.1016/j.biortech.2018.09.045
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发表时间：
2018-12
影响因子：
11.4
通讯作者：
Zhiming Zhang;Zhuodong Yu;Jingjing Dong;Zihao Wang;Ke Ma;Xiang-yang Xu;Pedro J. J. Alvarezc-Pedro-J.-J.-Alvarezc-51323911;
中科院分区：
文献类型：
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作者：
Zhiming Zhang;Zhuodong Yu;Jingjing Dong;Zihao Wang;Ke Ma;Xiang-yang Xu;Pedro J. J. Alvarezc-Pedro-J.-J.-Alvarezc-51323911;
好氧颗粒污泥法处理低碳氮比的生活污水是中国和其他国家快速城市化的必要研究。本研究建立了两个不同进水C/N比的平行反应器（R1为15，R2为5）。随着碳氮比降低至5，粒径大（650 μm）、结构致密（完整性系数<0.1）的颗粒在R2中较稳定。高通量测序结果显示，在低碳氮比条件下，thaueraand paracoccuss等功能微生物富集，主成分分析进一步表明，这些微生物与胞外聚合物（EPS）中的色氨酸和蛋白样物质以及颗粒强度呈正相关。结果表明，在低碳氮比条件下，几种耐药微生物如thauera（19.5%）富集并分泌色氨酸和蛋白样物质，最终形成具有多种功能微生物的稳定颗粒。
Aerobic granular sludge process treating domestic wastewater with low C/N ratio is necessary to be studied for rapid urbanization in China and other countries. In this study, two parallel reactors with different influent C/N ratio (15 in R1, 5 in R2) were established. Compared to the disintegrated granule in R1 with high influent C/N ratio, granules with large size (650 μm) and compact structure (integrity coefficient <0.1) were stable in R2 along with influent C/N ratio decreased to 5. High-through sequencing illustrated the functional microbes likeThaueraandParacoccusenriched under low influent C/N ratio, and principal component analysis further showed these microbes were positive correlation with tryptophan and protein-like substances in extracellular polymeric substances (EPS) and granular strength. It was indicated that under low influent C/N ratio, several resistant microbes likeThauera(19.5%) enriched and then secreted tryptophan and protein-like substances, and stable granules with multi-functional microbes could be formed finally.