Nitrogen transformations and mass balances in anaerobic/anoxic/aerobic batch experiments with full-scale biomasses from BNR activated sludge systems.

Jacek Mąkinia; H. David Stensel; Krzysztof Czerwionka; Jakub Drewnowski; Daniel Zapero Gutierrez

Nitrogen transformations and mass balances in anaerobic/anoxic/aerobic batch experiments with full-scale biomasses from BNR activated sludge systems.

Abstract

The aim of this study was to investigate nitrogen mass balances occurring inside full-scale BNR activated sludge systems, with special attention to colloidal and dissolved organic nitrogen (CON and DON) transformations. For this purpose, laboratory experiments were carried out using process biomass from two large BNR plants in northern Poland. Two parallel batch reactors were operated in a 3-phase (anaerobic/anoxic/aerobic) cycle. In one reactor, the settled wastewater without any pretreatment was used, whereas the settled wastewater after coagulation-flocculation (to remove colloidal and particulate fractions) was added to another reactor. The chemical pretreatment of settled wastewater with ZnSO4 did not adversely affect the observed nitrification rates in the (last) aerobic phase. It caused, however, a reduction of denitrification rates in the anoxic phase. Moreover, the chemical pretreatment did not appear to generally decrease DON but decreased CON. DON was explicitly produced in the aerobic phase and organic nitrogen conversion also occurred at a significant rate in the anoxic phase with biodegradable COD consumption and solids hydrolysis. The inorganic N mass balances revealed N losses up to approximately 10% which could be attributed to a few novel pathways of nitrogen removal, most likely aerobic denitrification or simultaneous nitrification/denitrification.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: WATER SCIENCE AND TECHNOLOGY no. 60, pages 2463 - 2470,
ISSN: 0273-1223
Language:: English
Publication year:: 2009
Bibliographic description:: Mąkinia J., Stensel H., Czerwionka K., Drewnowski J., Zapero Gutierrez D.: Nitrogen transformations and mass balances in anaerobic/anoxic/aerobic batch experiments with full-scale biomasses from BNR activated sludge systems.// WATER SCIENCE AND TECHNOLOGY. -Vol. 60, nr. iss. 9 (2009), s.2463-2470
Verified by:: Gdańsk University of Technology

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