Effect of substrate concentration on stability of anammox biofilm reactors |
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Authors: | Chong-jian Tang Ping Zheng Q Mahmood and Jian-wei Chen |
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Affiliation: | [1]Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China [2]Department of Environmental Sciences. COMSATS University, Abbottabad, Pakistan |
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Abstract: | Ammonium and nitrite are two substrates of anammox bacteria, but they are also inhibitors under high concentrations. The performance
of two anaerobic ammonium-oxidizing (anammox) upflow biofilm (UBF) reactors was investigated. The results show that anammox
UBFs become unstable under nitrogen loading rate (NLR) applied higher than 1.0 g/(L·d). The consumptions of acidity in the
anammox reaction lead to the increase of pH, which is as high as 8.70–9.05. Free nitrous acid concentration is accompanied
to be lower than the affinity constant of anammox bacteria, and then starvation effect appears. Moreover, free ammonia concentration
increases to 57–178 mg/L, resulting in inhibitory effect on the anammox bacteria. Both negative effects contribute to the
instability of the anammox bioreactors. |
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Keywords: | anammox biofilm bioreactor pH free ammonia free nitrous acid nitrogen removal |
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