Disintegrated Waste-Activated Sludge (NO 2 /FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP

Dorota Szypulska, Kamil Janiak (), Bartosz Zięba, Anna Wizimirska, Marek Mołczan, Sławomir Szerzyna and Renata Tomczak-Wandzel
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Dorota Szypulska: Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Kamil Janiak: Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Bartosz Zięba: Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Anna Wizimirska: Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Marek Mołczan: Faculty of Environmental Engineering, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
Sławomir Szerzyna: Wroclaw Municipal Water and Sewage Company, Na Grobli 14/16, 50-421 Wroclaw, Poland
Renata Tomczak-Wandzel: Aquateam COWI, Karvesvingen 2, 0579 Oslo, Norway

Resources, 2024, vol. 13, issue 6, 1-15

Abstract: The deficiency of readily biodegradable organic carbon can be a significant limitation to effective nitrogen removal during wastewater denitrification. Waste-activated sludge (WAS) is a source of carbon produced directly at wastewater treatment plants (WWTPs). Raw WAS has a large molecular weight and complex chemical structure molecules that are not easily available for microorganisms. In this study, easily biodegradable organic fractions were released using pH control and/or nitrites and nitric acid (NO 2 /FNA). The obtained results indicated that WAS can be a sufficient carbon source for denitrification in WWTPs that are at risk of minor effluent violations. The implementation of WAS disintegration with the use of pH control and NO 2 /FNA allowed for the denitrification of an additional 0.5 and 0.8 mgN-NO 3 /L. WAS disintegration, besides being a source of carbon generation, reduces the volume of sludge and leads to the implementation of a closed-loop system.

Keywords: SCOD biodegradability fractions; waste-activated sludge; nitrogen uptake rate; WWTP effluent simulations (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2024
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