Development of the combined nitritation-anammox process in an upflow anaerobic sludge blanket (UASB) reactor with anammox granules

被引：0
|
作者：
Li, Xiaojin [1 ]
Sung, Shihwu [1 ,2 ]
机构：
[1] Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames,IA,50011, United States
[2] Forestry, and Natural Resource Management, University of Hawaii at Hilo, Hilo,HI,96720, United States
来源：
Chemical Engineering Journal | 2015年 / 281卷
关键词：
The combined nitritation-anaerobic ammonium oxidation (anammox) process represents a promising innovative technology for biological nitrogen removal; especially for treating wastewater with low chemical oxygen demand (COD) to ammonium ratios. In the present study; a laboratory-scale upflow anaerobic sludge blanket (UASB) reactor; which has been operated under low oxygen levels (≤0.5mgL-1) for over 280days; was shown to remove about 88% of the supplied total nitrogen loads without nitrite/nitrate accumulation. During the start-up period; the reactor was initially inoculated with enriched anammox granules and fed with synthetic wastewater; where the ammonium concentration was fixed but nitrite concentration was gradually decreased to zero. As the influent NO2--N/NH4+-N ratio decreased; O2 supply was increased gradually to facilitate the conversion of ammonium to nitrite by ammonium oxidation bacteria (AOB). Our results showed that the nitritation-anammox granules with porous structures were enriched and featured good settling ability. Microbial community composition was investigated by fluorescence in situ hybridization (FISH); which demonstrated the coexistence of AOB and anammox bacteria in the granules. The two groups of bacteria exhibited an overlapping growth style; which can improve ammonium availability to anammox bacteria and facilitate the immediate consumption of nitrite (produced by AOB) by anammox bacteria. © 2015 Elsevier B.V.;
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页码：837 / 843
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