[Stability of shortcut nitrification-denitrification].
The effects of temperature and aeration time on the stability of shortcut nitrification-denitrification are studied specially in some experiments are carried on a sequencing batch reactor (SBR) fed with soybean wastewater. Results show that shortcut nitrification-denitrification achieved by controlling temperature was not stable until the temperature was more than 28 degrees C. In addition, for the first time strong effect of excess aeration on shortcut nitrification-denitrification is observed. When the system run under excess aeration for twelve days, the type of nitrification turned from shortcut nitrification which nitrosation rate (NO2(-)-N/NOx(-) -N) was more than 96% to complete nitrification which nitrosation rate (NO2(-) -N/NOx(-) -N) was less than 39.3%. So, in order to make shortcut nitrification-denitrification run stably, real-time process control must be used.
Gao
Da-Wen
DW
College of Forest Resources and Environment, Northeast Forestry University, Harbin 150040, China. gdw@tsinghua.edu.cn
Peng
Yong-Zhen
YZ
D019149:Bioreactors; D007220:Industrial Waste / Q000032:analysis*; D009573:Nitrites / Q000378:metabolism*; D009576:Nitrobacter / Q000378:metabolism*; D013025:Glycine max; D014865:Waste Disposal, Fluid / Q000379:methods*
D007220:Industrial Waste; D009573:Nitrites