Sequential Nitrification—Autotrophic Denitrification Using Sulfur as an Electron Donor and Chilean Zeolite as Microbial Support

Sequential nitrification–autotrophic denitrification (SNaD) was carried out for ammonium removal in synthetic wastewater (SWW) using sulfur as an electron donor in denitrification. Four reactors were operated in batch mode, two with zeolite (1 mm size) used as microbial support and two without suppo...

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Bibliographic Details
Published in:Water (Basel) 2023-01, Vol.15 (1), p.95
Main Authors: Barahona, A., Rubio, J., Gómez, R., Huiliñir, C., Borja, R., Guerrero, L.
Format: Article
Language:English
Subjects:
Ammonium
Carbon
Denitrification
Efficiency
Microorganisms
Nitrates
Nitrification
Nitrogen
Oxidation
Reactors
Stainless steel
Sulfur
Sulfur compounds
Wastewater
Wastewater treatment
Zeolites
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Summary:Sequential nitrification–autotrophic denitrification (SNaD) was carried out for ammonium removal in synthetic wastewater (SWW) using sulfur as an electron donor in denitrification. Four reactors were operated in batch mode, two with zeolite (1 mm size) used as microbial support and two without support, to assess the effect of the zeolite addition in the SNaD. Aeration, anoxic, and anaerobic cycles were established, where 96% removal of NH4+-N (oxidized to nitrite or nitrate) was achieved in nitrification, along with 93% removal of NO3−-N in denitrification for the SNaD with zeolite. It was observed that the use of zeolite assists in buffering reactor load changes. Inhibition caused by nitrite accumulation in the denitrification stage was minimized by increasing the nitrogen concentration in the SWW. The results obtained in this study are the basis for the development of ammonium removal by simultaneous nitrification–autotrophic denitrification using a single reactor.
ISSN:2073-4441
2073-4441
DOI:10.3390/w15010095