Application of Anammox-Based Processes in Urban WWTPs: Are We on the Right Track?
Autor: | Alba Pedrouso, Dafne Crutchik, José Ramón Vázquez-Padín, José Luis Campos |
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Přispěvatelé: | Universidade de Santiago de Compostela. Departamento de Enxeñaría Química, Universidade de Santiago de Compostela. Instituto Interdisciplinar de Tecnoloxías Ambientais (CRETUS) |
Rok vydání: | 2021 |
Předmět: |
Denitrification
effluent quality autotrophic nitrogen removal 0208 environmental biotechnology Autotrophic nitrogen removal chemistry.chemical_element Bioengineering TP1-1185 02 engineering and technology 010501 environmental sciences 01 natural sciences mainstream chemistry.chemical_compound Nitrate Chemical Engineering (miscellaneous) Operational costs QD1-999 Effluent energy efficiency Sludge thermal hydrolysis 0105 earth and related environmental sciences Chemical technology Process Chemistry and Technology Pulp and paper industry Nitrogen Effluent quality 020801 environmental engineering Chemistry Energy efficiency Nitritation chemistry Anammox sludge thermal hydrolysis Biological reactor nitritation Environmental science Sewage treatment Mainstream |
Zdroj: | Processes Volume 9 Issue 8 Processes, Vol 9, Iss 1334, p 1334 (2021) Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela instname |
ISSN: | 2227-9717 |
Popis: | The application of partial nitritation and anammox processes (PN/A) to remove nitrogen can improve the energy efficiency of wastewater treatment plants (WWTPs) as well as diminish their operational costs. However, there are still several limitations that are preventing the widespread application of PN/A processes in urban WWTPs such as: (a) the loss of performance stability of the PN/A units operated at the sludge line, when the sludge is thermally pretreated to increase biogas production (b) the proliferation of nitrite-oxidizing bacteria (NOB) in the mainstream and (c) the maintenance of a suitable effluent quality in the mainstream. In this work, different operational strategies to overcome these limitations were modelled and analyzed. In WWTPs whose sludge is thermically hydrolyzed, the implementation of an anerobic treatment before the PN/A unit is the best alternative, from an economic point of view, to maintain the stable performance of this unit. In order to apply the PN/A process in the mainstream, the growth of ammonia-oxidizing bacteria (AOB) should be promoted in the sludge line by supplying extra sludge to the anaerobic digesters. The AOB generated would be applied to the water line to partially oxidize ammonia, and the anammox process would then be carried out. Excess nitrate generated by anammox bacteria and/or NOB can be removed by recycling a fraction of the WWTP effluent to the biological reactor to promote its denitrification. |
Databáze: | OpenAIRE |
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