气压对改良型双污泥工艺污染物去除途径的影响  

Influence of atmospheric pressure on pollutants removal path in the modified dual-sludge process

作　　者：李淑萍[1,2] 陈悦 陆勇泽 韩震 孟江[1,2] 杨俊玲[1,2] 朱光灿 LI Shuping;CHEN Yue;LU Yongze;HAN Zhen;MENG Jiang;YANG Junling;ZHU Guangcan(College of Information Engineering,Xizang Minzu University,Xianyang 712082,China;Key Laboratory of Water Pollution Control and Ecological Restoration of Xizang,National Ethnic Affairs Commission,Xizang Minzu University,Xianyang 712082,China;School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]西藏民族大学信息工程学院,咸阳712082 [2]西藏民族大学西藏水污染控制与生态修复国家民委重点实验室,咸阳712082 [3]东南大学能源与环境学院,南京210096

出　　处：《环境工程学报》2023年第1期113-123,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金地区基金项目(52160004);西藏自治区自然科学基金一般项目(XZ202201ZR0047G)。

摘　　要：基于改良型双污泥除磷脱氮工艺在不同气压条件下稳态运行数据,探讨了海拔分别为400 (96 kPa)、2 800(72 kPa)和3 300 m(65 kPa)下的工艺运行效能。结果表明,当气压从96 kPa降低至65 kPa, COD的去除率从87.45%提高至90.94%,低气压促进了聚磷菌厌氧释磷过程中胞内碳源的合成,有效提高了好氧吸磷效率,系统总磷去除效率从84.23%提升至90.44%。随气压降低,氨氧化菌的丰度和活性降低,低氧池硝化功能受限,进而限制了同步硝化反硝化作用,系统脱氮量减少,脱氮率从73.37%降低至69.89%。工艺各单元水质变化和物料衡算分析结果表明,各气压条件下改良型双污泥工艺磷主要通过好氧吸磷和反硝化聚磷过程去除,氮主要通过厌氧池的反硝化和低氧池的同步硝化反硝化过程去除。此外,随着气压的降低,曝气池中微生物的同化脱氮功能增强。本文结果为改良型双污泥工艺在高海拔地区市政污水处理中的应用提供了一定的理论参考。In this study, the operating efficiency of the modified dual-sludge process was discussed based on the data of its steady-state operation at different altitudes of 96 kPa(400 m), 72 kPa(2 800 m) and 65 kPa(3 300m). The results showed that when the atmospheric pressure decreased from 96 kPa to 65 kPa, the removal rate of COD increased from 87.45% to 90.94%. The low atmospheric pressure promoted the synthesis of intracellular carbon sources during the anaerobic phosphorus release process of phosphate-accumulating organisms.Therefore, the aerobic phosphorus absorption efficiency increased effectively, and the removal efficiency of total phosphorus in the system increased from 84.23% to 90.44%. The abundance and activity of ammonia oxidizing bacteria decreased with the decrease of atmospheric pressure, and the nitrification function of the hypoxia tank was limited. Then the simultaneous nitrification and denitrification were limited and the denitrification amount of the system decreased, the corresponding denitrification rate decreased from 73.37% to69.89%. The results of water quality variations along the units in the process and material balance analysis showed that phosphorus was mainly removed by the aerobic phosphorus absorption and denitrifying phosphateaccumulating at 96 kPa, 72 kPa and 65 kPa. Nitrogen was mainly removed by the denitrification process in the anaerobic tank and the simultaneous nitrification and denitrification in the hypoxia tank. In addition, the assimilative denitrification in the aeration tank was enhanced with the decrease of atmospheric pressure. The result in this study provides a certain theoretical basis for the application of the modified dual-sludge process in municipal sewage treatment in high altitude areas.

关 键 词：高海拔地区 气压 改良型双污泥工艺 除磷脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]