Using Passive Atmospheric Oxygenation to Increase Nitrification Potential in a non-Planted Vertical Flow Constructed Bed System
Xiaoli Du1, Zuxin Xu2, Junqi Li1, Kunming Fu1
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1 Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education,
School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture,
Beijing, 100044, China
2 School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
Pol. J. Environ. Stud. 2013;22(6):1685-1690
Nitrification potentials in micro-environment were examined in a non-planted vertical flow constructed bed system with an air pipe. The results showed that nitrification potential was significantly correlated with the dissolved oxygen inside the system. Enhanced nitrification of 10.15 g/m2·d was achieved, twice as much as the 4.71 g/m2·d obtained in the traditional one. Atmospheric oxygenation by the air pipe was a remarkable 23.7 g/m2·d, which improved the aerobic micro-environment for extra nitrification. Passive atmospheric oxy- genation, which was increased by the air pipe without energy consumption, stimulated the growth of nitrify- ing bacteria and provided favorable habitats of bacterial richness. This results in high nitrification potential in the constructed bed, which is good for high-concentration rural wastewater treatment.
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