Effect of Chemical Oxygen Demand Concentration on Nutrient Removal in Simultaneous Nitrification, Denitrification and Phosphorus Removal System in High-Altitude Areas
Yani Zhao,
Liling Zhang,
Meng Zhang,
Jingya Wu,
Shuping Li,
Douzhi Ran,
Liwei Sun,
Guangcan Zhu
Affiliations
Yani Zhao
Xizang of Water Pollution Control and Ecological Restoration Engineering Laboratory, School of Information Engineering, Xizang Minzu University, Xianyang 712082, China
Liling Zhang
School of Energy & Environment, Southeast University, Nanjing 210096, China
Meng Zhang
School of Energy & Environment, Southeast University, Nanjing 210096, China
Jingya Wu
School of Energy & Environment, Southeast University, Nanjing 210096, China
Shuping Li
Xizang of Water Pollution Control and Ecological Restoration Engineering Laboratory, School of Information Engineering, Xizang Minzu University, Xianyang 712082, China
Douzhi Ran
Xizang of Water Pollution Control and Ecological Restoration Engineering Laboratory, School of Information Engineering, Xizang Minzu University, Xianyang 712082, China
Liwei Sun
School of Energy & Environment, Southeast University, Nanjing 210096, China
Guangcan Zhu
Xizang of Water Pollution Control and Ecological Restoration Engineering Laboratory, School of Information Engineering, Xizang Minzu University, Xianyang 712082, China
The application of biological nitrogen and phosphorus removal processes in high-altitude areas faces severe challenges due to low temperature, low atmosphere pressure and low oxygen concentration. In this study, a simultaneous nitrification, denitrification and phosphorus removal (SNDPR) system was operated under low atmosphere pressure. The chemical oxygen demand (COD) concentrations in influent were decreased from 300 mg/L (stage I) to 200 mg/L (stage II), corresponding to the low COD concentration of sewage in high-altitude areas. The removal of COD and total phosphate was efficient at the H1 reactor (72 kPa). The removal rates of COD and total phosphate were 94.08% (stage I), 90.66% (stage II) and 98.43% (stage I), 99.34% (stage II), respectively, which were similar to L1 (100 kPa). The removal rates of total inorganic nitrogen and simulation nitrification and denitrification were from 81.21% (stage I) and 59.48% (stage I) to 72.86% (stage II) and 31.95% (stage II), respectively, which were also improved compared to L1. Cycle experiment results indicated that the activity of phosphorus accumulating organisms was enhanced, while the ammonia oxidation process was inhibited under low atmosphere pressure.
