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Effect of nitrite and nitrate on sulfate reducing ammonium oxidation
- Source :
- Water Science and Technology. 80:634-643
- Publication Year :
- 2019
- Publisher :
- IWA Publishing, 2019.
-
Abstract
- The effects of nitrite and nitrate on the integration of ammonium oxidization and sulfate reduction were investigated in a self-designed reactor with an effective volume of 5 L. An experimental study indicated that the ammonium oxidization and sulfate reduction efficiencies were increased in the presence of nitrite and nitrate. Studies showed that a decreasing proportion of N/S in the presence of NO2− at 30 mg·L−1 would lead to high removal efficiencies of NH4+-N and SO42–-S of up to 78.13% and 46.72%, respectively. On the other hand, NO3− was produced at approximately 26.89 mg·L−1. Proteobacteria, Chloroflexi, Bacteroidetes, Chlorobi, Acidobacteria, Planctomycetes and Nitrospirae were detected in the anaerobic cycle growth reactor. Proteobacteria was identified as the dominant functional bacteria removing nitrogen in the reactor. The nitritation reaction could promote the sulfate-reducing ammonium oxidation (SRAO) process. NH4+ was converted to NO2 and other intermediates, for which the electron acceptor was SO42−. These results showed that nitrogen was converted by the nitrification process, the denitrification process, and the traditional anammox process simultaneously with the SRAO process. The sulfur-based autotrophic denitration and denitrification in the reactor were caused by the influent nitrite and nitrate.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Denitrification
Nitrogen
chemistry.chemical_element
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Bioreactors
Nitrate
010608 biotechnology
Ammonium Compounds
Ammonium
Nitrite
Sulfate
Nitrites
0105 earth and related environmental sciences
Water Science and Technology
Nitrates
Sulfates
Chemistry
Anammox
Nitrification
Oxidation-Reduction
Nuclear chemistry
Subjects
Details
- ISSN :
- 19969732 and 02731223
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- Water Science and Technology
- Accession number :
- edsair.doi.dedup.....f1e4e85cdf333a13da218b94af32e777