Journal
BIORESOURCE TECHNOLOGY
Volume 224, Issue -, Pages 140-146Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.11.070
Keywords
Endogenous partial denitrification; Nitrite accumulation; PHAs; Glycogen; Anammox
Funding
- Natural Science Foundation of China [51478013]
- Funding Projects of Beijing Municipal Commission of Education
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This study proposed a novel strategy for achievement of partial denitrification driven by endogenous car-bon sources in an anaerobic/anoxic/aerobic activated sludge system. Results showed that in the steady-stage, the nitrate-to-nitrite transformation ratio (NTR) was kept at around 87% without nitrate in the effluent. During the anaerobic period, exogenous carbon sources was completely taken up, accompanied by the consumption of glycogen and production of polyhydroxyalkanoates (PHAs). During the anoxic per-iod, nitrate was reduced to nitrite by using PHAs as carbon sources, followed by the replenishment of glycogen. Thus, the phenotype of denitrifying GAOs was clearly observed and endogenous partial denitrification (EPD) occurred. Furthermore, results showed the nitrate reduction was prior to the nitrite reduc-tion in the presence of nitrate, which led to the high nitrite accumulation. (C) 2016 Elsevier Ltd. All rights reserved.
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