Enhanced nitrogen removal at low temperature with mixed anoxic/oxic process
作者机构：School of Civil and Transportation EngineeringHebei University of TechnologyTianjin 300401China School of EnvironmentHarbin Institute of TechnologyHarbin 150090China
出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)
年 卷 期：2023年第16卷第1期
页 面：67-75页
核心收录：
基 金：supported by the National Natural Science Foundation of China(Grants No.51978233 and 52000057) the China Postdoctoral Science Foundation(Grant No.2020M680844).
主 题：Domestic sewage Low temperature Mixed A/O process Nitrogen removal Bacterial community structure
摘 要：Different hydraulic retention times(HRTs)were tested in a mixed anoxic/oxic(A/O)system at 5C and 10C to investigate the effects of HRT and carrier on nitrogen removal in wastewater at low temperatures.The results showed that the addition of the fillers improved the treatment effect of each index in the system.With an optimal HRT of 7.5 h at 5C,the removal efficiencies of NHþ4-N and total nitrogen(TN)reached 91.2%and 75.6%,respectively.With an HRT of 6 h at 10C,the removal efficiencies of NHþ4-N and TN were 96.7%and 82.9%,respectively.The results of high-throughput sequencing showed that the addition of the suspended carriers in the aerobic zone could improve the treatment efficiency of nitrogen at low temperatures.The microbial analysis indicated that the addition of the suspended carriers enhanced the enrichment of nitrogen removal bacteria.Nitrospira,Nitrotoga,and Nitrosomonas were found to be the bacteria responsible for nitrification,and their relative concentrations on the biofilm at 5C and 10C accounted for 98.11%,92.79%,and 69.98%of all biological samples,respectively.
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