Characteristics of sludge granulation and EPS production in development of stable partial nitrification

被引：73
作者：
Li, Xiangchen [1 ]
Du, Rui [1 ]
Peng, Yongzhen [1 ]
Zhang, Qiong [1 ]
Wang, Jincheng [1 ]
机构：
[1] Beijing Univ Technol, Engn Res Ctr Beijing, Natl Engn Lab Adv Municipal Wastewater Treatment, Beijing 100124, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2020年 / 303卷
关键词：
Partial nitrification; Sludge granulation; Micro-granules; EPS; Protein secondary structure; EXTRACELLULAR POLYMERIC SUBSTANCES; WASTE-WATER TREATMENT; NITROGEN REMOVAL; ACTIVATED-SLUDGE; SPECTROSCOPIC CHARACTERIZATION; PARTIAL NITRITATION/ANAMMOX; BATCH REACTOR; ANAMMOX; BIOFILM; SYSTEM;
D O I：
10.1016/j.biortech.2020.122937
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
In this study, sequencing batch reactor (SBR) and aerobic upflow sludge bed reactor (AeUSB) were used to investigate the effects of sludge granulation on establishing partial nitrification (PN) process and explore the potential mechanism. The particle size was positively related to the NO2--N accumulating performance, satisfactory nitrite accumulation rate (NAR) of 96.4% and 77.3% were obtained with the appearance of microgranules in SBR and AeUSB after day 105 and 83, respectively. To our knowledge, it is the first report describing the importance of extracellular polymeric substances (EPS) content and components, such as aromatic protein-like substances, by-product-like substances and special protein secondary structures (alpha-helices and 3-turn helices) for sludge granulation and even PN process. Quantitative microbial analysis suggested that ammonium oxidizing bacteria (AOB) predominated in nitrifying-bacterium in micro-granules system, guaranteeing a highly efficient PN process.
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页数：9
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