Determination of the major factor responsible for soluble organic matter release during nitrite/free nitrous acid pre-treatment of waste activated sludge

Szypulska, Dorota; Miodoński, Stanisław; Muszyński-Huhajło, Mateusz; Zięba, Bartosz; Janiak, Kamil

doi:10.1016/j.biortech.2021.124917

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Moreover, the addition of NO 2 /FNA could not overcome a shorter retention time, as the value recorded for R7 (255 mgN-NO 2 /L, pH 5, 24 h) was lower than that observed for the reactors with only pH control (no nitrite addition, but a retention time of 48 h). Overall, the obtained results are in accordance with previous studies, which indicates that the obtained disintegrated streams are reliable [16,17].…”

Section: Disintegration Efficiency-scodsupporting

confidence: 91%

“…Concentrations over 2000 mgN-NO 2 /L resulted in increased VFA/SCOD ratios of up to 24%. Moreover, pH levels lower than 5.5 led to VFA/SCOD ratios under 10% [16,17].…”

Section: Disintegration Efficiency-volatile Fatty Acidsmentioning

confidence: 94%

“…The WAS from a full biological nutrient removal plant (operated at a high SRT) is exposed to NO 2 /FNA concentrations selected according to previous studies (123, 255, and 264 mgN-NO 2 /L; 2.8 and 5.8 mgN-HNO 2 /L, pH 5) [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Disintegrated Waste-Activated Sludge (NO2/FNA Method) as a Source of Carbon for Denitrification in the Mainstream of a WWTP

Szypulska,

Janiak,

Zięba

et al. 2024

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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 (NO2/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 NO2/FNA allowed for the denitrification of an additional 0.5 and 0.8 mgN-NO3/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.

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Section: Disintegration Efficiency-scodsupporting

confidence: 91%

“…Concentrations over 2000 mgN-NO 2 /L resulted in increased VFA/SCOD ratios of up to 24%. Moreover, pH levels lower than 5.5 led to VFA/SCOD ratios under 10% [16,17].…”

Section: Disintegration Efficiency-volatile Fatty Acidsmentioning

confidence: 94%