Issue 7, 2022

Recovery of anaerobic ammonium oxidation via hydrazine following sulfate inhibition

Abstract

The presence of sulfate in sewage treatment has obvious impacts on biological nitrogen removal. We explored the influence mechanism of sulfate on anammox and the recovery via hydrazine of anammox after inhibition. The sulfate inhibited HDH activity and functional gene abundance, which had serious effects on the metabolic process of hydrazine synthesis and oxidation. The conversion rates of ammonia nitrogen and nitrite dropped from 0.49 mgN gvss−1 h−1 and 0.63 mgN gvss−1 h−1 to 0.17 mgN gvss−1 h−1 and 0.25 mgN gvss−1 h−1. The absolute abundance of hzsA, hzsB and hzo dropped greatly from 7.3 × 104 to 3.7 × 104, 17.5 × 105 to 4.9 × 104 and 1.8 × 104 to 0.35 × 104, respectively. After supplying 10 mg L−1 of hydrazine, the normal metabolism of anammox was maintained. The addition of hydrazine helps cells resist the decaying effects and enhances the recovery capability of anammox bacteria following inhibition. These results demonstrate the promise of recovering anammox activity via hydrazine.

Graphical abstract: Recovery of anaerobic ammonium oxidation via hydrazine following sulfate inhibition

Article information

Article type
Paper
Submitted
16 јан. 2022
Accepted
14 мај 2022
First published
18 мај 2022

Environ. Sci.: Water Res. Technol., 2022,8, 1458-1465

Recovery of anaerobic ammonium oxidation via hydrazine following sulfate inhibition

S. Zhou, Z. Chen, J. Wang and Z. Yue, Environ. Sci.: Water Res. Technol., 2022, 8, 1458 DOI: 10.1039/D2EW00041E

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