[Analysis and establishment of control modes of advanced nitrogen removal via nitrite in SBR].
To achieve stable advanced nitrogen removal via nitrite in SBR, factors influencing pH variation in treating real domestic wastewater were investigated. The characteristic points were found to be appeared obviously on pH profile at both ends of ammonia oxidization and denitrification by analyzing the mechanism of biological nitrogen removal and the balance of carbonic acid. Using pH as control parameter in SBR for treating domestic or municipal wastewater with low organic concentration and suitable alkalinity could achieve advanced nitrogen removal with effluent TN below 1 mg/L. Moreover, it could prevent the decrease of nitrite accumulation rate causing by excessive aeration, which plays an important role on the stability of advanced nitrogen removal via nitrite. Based on theoretical analysis and experimental study, the real-time control strategy of advanced nitrogen removal via nitrite was established. To accommodate the different water quality and retain the accuracy of control strategy, 18 adjustable variables were set up in control strategy. The control strategy established a foundation for developing control software and control system of advanced nitrogen removal via nitrite.
Yang
Qing
Q
Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. bf58021@163.com
Peng
Yong-Zhen
YZ
Wang
Shu-Ying
SY
Gu
Sheng-Bo
SB
Liu
Xiu-Hong
XH
Li
Ling-Yun
LY
D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D009573:Nitrites / Q000737:chemistry / Q000302:isolation & purification*; D009584:Nitrogen / Q000737:chemistry / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid / Q000379:methods*
D009573:Nitrites; D009584:Nitrogen