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Effect of divalent nickel on the anammox process in a UASB reactor.
- Source :
-
Chemosphere . Jul2019, Vol. 226, p934-944. 11p. - Publication Year :
- 2019
-
Abstract
- The anaerobic ammonium oxidation (anammox) process has the advantages of a high nitrogen removal rate, low operational cost, and small footprint and has been successfully implemented to treat high-content ammonium wastewater. However, very little is known about the toxicity of the heavy metal element Ni(II) to the anammox process. In this study, the short- and long-term effects of Ni(II) on the anammox process in an upflow anaerobic sludge blanket (UASB) reactor were revealed. The results of the short-term batch test showed that the half maximal inhibitory concentration (IC 50) of Ni(II) on anammox biomass was 14.6 mg L−1. A continuous-flow experiment was performed for 150 days of operation, and the results illustrated that after domestication, the achieved nitrogen removal efficiency was up to 93±0.03% at 10 mg L−1 Ni(II). The settling velocity, specific anammox activity and EPS content decreased as the Ni(II) concentration increased. Nevertheless, the content of heme c increased as the Ni(II) increased. These results indicate that short-term exposure to Ni(II) has an adverse impact on anammox process, but the anammox system could tolerate 10 mg L−1 Ni(II) stress after acclimation during continuous-flow operation for 150 days. High-throughput sequencing results indicated that the presence of Ni(II) had an impact on the microbial community composition in the anammox reactor, especially Candidatus Kuenenia. At Ni(II) concentrations of 0-10 mg L−1, the relative abundance of Candidatus Kuenenia decreased from 36.23% to 28.46%. • The IC50 of Ni(II) on anammox biomass was 14.64 mg L−1 in short-term assay. • The effect of Ni(II) on substrate removal kinetic behavior of anammox was studied. • The long-term effects of Ni(II) in anammox UASB reactor were evaluated. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00456535
- Volume :
- 226
- Database :
- Academic Search Index
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 136157328
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2019.03.121