稳定亚硝化发展过程中污泥颗粒化和胞外聚合物产生的特性。
Characteristics of sludge granulation and EPS production in development of stable partial nitrification.
机构信息
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
出版信息
Bioresour Technol. 2020 May;303:122937. doi: 10.1016/j.biortech.2020.122937. Epub 2020 Jan 30.
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 NO-N accumulating performance, satisfactory nitrite accumulation rate (NAR) of 96.4% and 77.3% were obtained with the appearance of micro-granules 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 (α-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.
在这项研究中，采用序批式反应器（SBR）和好氧上流污泥床反应器（AeUSB）来研究污泥颗粒化对建立部分硝化（PN）过程的影响，并探讨潜在的机制。颗粒尺寸与 NO-N 积累性能呈正相关，SBR 和 AeUSB 中出现微颗粒后，分别在第 105 天和第 83 天获得了令人满意的亚硝酸盐积累率（NAR），达到 96.4%和 77.3%。据我们所知，这是首次描述胞外聚合物（EPS）含量和组成（如芳香蛋白样物质、副产物样物质和特殊蛋白质二级结构（α-螺旋和 3 转角螺旋）对污泥颗粒化甚至 PN 过程的重要性。定量微生物分析表明，氨氧化细菌（AOB）在微颗粒系统中的硝化菌中占优势，保证了高效的 PN 过程。
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