Chang Ben-Ze, Zhang Shuai, Chen Dong-Zhi, Gao Kai-Tuo, Yang Guang-Feng
Department of Environmental Science and Engineering, Zhejiang Ocean University, No.1 Haida South Road, Zhoushan, 316022, People's Republic of China.
Zhejiang Provincial Key Laboratory of Petrochemical Environmental Pollution Control, Zhoushan, 316022, People's Republic of China.
Biodegradation. 2024 Aug;35(5):621-639. doi: 10.1007/s10532-024-10080-7. Epub 2024 Apr 15.
In order to explore the operation performance, kinetic characteristics and bacterial community of the short-cut nitrification and denitrification (SND) system, the SND system with pre-cultured short cut nitrification and denitrification sludge was established and operated under different ferrous ion (Fe (II)) conditions. Experimental results showed that the average NH-N removal efficiency (ARE) of SND system was 97.3% on Day 5 and maintained a high level of 94.9% ± 1.3% for a long operation period. When the influent Fe(II) concentration increased from 2.3 to 7.3 mg L, the sedimentation performance, sludge concentration and organic matter removal performance were improved. However, higher Fe(II) of 12.3 mg L decreased the removal of nitrogen and COD with the relative abundance (RA) of Proteobacteria and Bacteroidetes decreased to 30.28% and 19.41%, respectively. Proteobacteria, Bacteroidetes and Firmicutes were the dominant phyla in SND system. Higher Fe(II) level of 12.3 mg L increase the RA of denitrifying genus Trichococcus (33.93%), and the denitrifying genus Thauera and Tolumonas dominant at Fe(II) level of no more than 7.3 mg L.
为了探究短程硝化反硝化（SND）系统的运行性能、动力学特性和细菌群落，建立了具有预培养短程硝化反硝化污泥的SND系统，并在不同亚铁离子（Fe（II））条件下运行。实验结果表明，SND系统在第5天的平均氨氮去除效率（ARE）为97.3%，在较长的运行期内保持94.9%±1.3%的高水平。当进水Fe（II）浓度从2.3 mg/L增加到7.3 mg/L时，沉淀性能、污泥浓度和有机物去除性能得到改善。然而，12.3 mg/L的较高Fe（II）浓度降低了氮和化学需氧量的去除率，变形菌门和拟杆菌门的相对丰度（RA）分别降至30.28%和19.41%。变形菌门、拟杆菌门和厚壁菌门是SND系统中的优势菌门。12.3 mg/L的较高Fe（II）水平增加了反硝化菌毛球菌属的RA（33.93%），而在Fe（II）水平不超过7.3 mg/L时，反硝化菌陶厄氏菌属和托卢莫氏菌属占主导地位。
