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Identification of optimal parameters for treatment of high-strength ammonium leachate by mixed communities of heterotrophic nitrifying/aerobic denitrifying bacteria
- Source :
- Bioresource technology. 336
- Publication Year :
- 2021
-
Abstract
- Heterotrophic nitrifying and aerobic denitrifying bacteria (HNADB) are important for partial nitrification treatment of high strength ammonium leachate. However, conditions for their optimal performance in mixed reactor systems have yet to be determined. In this study, optimal parameters were identified and included free ammonia (FA) concentrations below 40 mg/L, a dissolved oxygen concentration of 1.2 mg/L, a carbon to nitrogen ratio of 5 and a reflux ratio of 4. These conditions were applied to a continuous anoxic/oxic membrane moving biofilm reactor treating raw incineration leachate with high total ammonium nitrogen (TAN = 1400 mg/L). Ammonium conversion and nitrogen removal efficiencies of 99% and 86% were achieved. Autotrophic ammonia oxidizing bacteria were inhibited at FA concentrations above 25 mg/L. HNADB, particularly Paracoccus species, contributed to ammonium conversion at high FA (25–40 mg/L). These results show that leachate with high TAN and FA can be treated using parameters that support the growth of HNADB.
- Subjects :
- 0106 biological sciences
Environmental Engineering
Carbon-to-nitrogen ratio
Nitrogen
Heterotroph
Bioengineering
010501 environmental sciences
01 natural sciences
Ammonia
chemistry.chemical_compound
Denitrifying bacteria
Bioreactors
010608 biotechnology
Ammonium Compounds
Ammonium
Leachate
Waste Management and Disposal
0105 earth and related environmental sciences
Renewable Energy, Sustainability and the Environment
Heterotrophic Processes
General Medicine
Anoxic waters
Nitrification
Bacteria, Aerobic
chemistry
Environmental chemistry
Denitrification
Subjects
Details
- ISSN :
- 18732976
- Volume :
- 336
- Database :
- OpenAIRE
- Journal :
- Bioresource technology
- Accession number :
- edsair.doi.dedup.....7b129c8d85260c0c2f813990a220b7e0