Effect of free nitrous acid as inhibitors on nitrate reduction by a biological nutrient removal sludge

Ma, Jinxing; Yang, Qing; Wang, Shuying; Wang, Li; Takigawa, Akio; Peng, Yongzhen

doi:10.1016/j.jhazmat.2009.10.036

Cited by 63 publications

(28 citation statements)

References 30 publications

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“…Similar nitrate and nitrite profiles were established under limiting (COD/

{NO}_{3}^{-} - N

of 3) and nonlimiting carbon dosing (COD/

{NO}_{3}^{-} - N

of 10; Figure a,b) confirming this hypothesis. Although free nitrous acid inhibition of denitrifiers has been reported at levels of 0.2 mg HNO 2 ‐N/L (Ma et al, ), a combination of PdN with AnAOB (Figure d) confirmed that the nitrite concentration, and thus free nitrous acid concentrations, did not play any role in the PdN selection in our study.…”

Section: Discussioncontrasting

confidence: 50%

Nitrate residual as a key parameter to efficiently control partial denitrification coupling with anammox

Peng

et al. 2019

Water Environment Research

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Despite the increased research efforts, full-scale implementation of shortcut nitrogen removal strategies has been challenged by the lack of consistent nitrite-oxidizing bacteria out-selection. This paper proposes an alternative path using partial denitrification (PdN) selection coupled with anaerobic ammonium-oxidizing bacteria (AnAOB). A nitrate residual concentration (>2 mg N/L) was identified as the crucial factor for metabolic PdN selection using acetate as a carbon source, unlike the COD/N ratio which was often suggested. Therefore, a novel and simple acetate dosing control strategy based on maintaining a nitrate concentration was tested in the absence and presence of AnAOB, achieving PdN efficiencies above 80%. The metabolic-based PdN selection allowed for flexibility to move between PdN and full denitrification when required to meet effluent nitrate levels. Due to the independence of this strategy on species selection and management of nitrite competition, this novel approach will guarantee nitrite availability for AnAOB under mainstream conditions unlike shortcut nitrogen removal approaches based on NOB out-selection. Overall, a COD addition of only 2.2 g COD/g TIN removed was needed for the PdN-AnAOB concept showing its potential for significant savings in external carbon source needs to meet low TIN effluent concentrations making this concept a competitive alternative. • Practitioner points• Nitrate residual is the key control parameter for partial denitrification selection. • Metabolic selection allowed for flexibility of moving from partial to full denitrification. • 2.2 g COD/g TIN removed was needed for partial denitrification-anammox process.

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“…Similar nitrate and nitrite profiles were established under limiting (COD/

{NO}_{3}^{-} - N

of 3) and nonlimiting carbon dosing (COD/

{NO}_{3}^{-} - N

Section: Discussioncontrasting

confidence: 50%

Nitrate residual as a key parameter to efficiently control partial denitrification coupling with anammox

Peng

et al. 2019

Water Environment Research

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show abstract

“…Lower nitrite accumulation is associated with lower probability of nitrite-caused inhibition of denitrification (Almeida et al, 1995a,b). This inhibition is more probable at low pH values, as the toxicity is assumed to be caused mainly by the unionized nitrous acid (Ma et al, 2010).…”

Section: Influence Of Temperature On Nitrite Accumulationmentioning

confidence: 99%

Comparison of denitrification at low temperature using encapsulated Paracoccus denitrificans, Pseudomonas fluorescens and mixed culture

Vacková

Srb

Stloukal

et al. 2011

Bioresource Technology

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“…However, VFAs yields were still higher in these two fermentors (Table 1), in particular, acetic and propionic acids, the appropriate organic carbon sources for denitrification [9,28,29], accounted for more than 50% of detected VFAs. Other studies found that FNA also inhibited denitrifiers at the range of 0.01e0.025 mg L À1 as HNO 2 -N [30]. The results from this study showed that the FNA concentration was 5 mg L À1 as HNO 2 -N at the pH of 5, and the average NO 2 À reduction rate was 3.67 mg$(L$h) À1 as NO 2 À -N, which was similar to that at the pH of 9 (Fig.…”

Section: Comparison Of Acidification Between Acidic and Alkaline Condmentioning

confidence: 90%

Effect of free nitrous acid as inhibitors on nitrate reduction by a biological nutrient removal sludge

Cited by 63 publications

References 30 publications

Nitrate residual as a key parameter to efficiently control partial denitrification coupling with anammox

Nitrate residual as a key parameter to efficiently control partial denitrification coupling with anammox

Comparison of denitrification at low temperature using encapsulated Paracoccus denitrificans, Pseudomonas fluorescens and mixed culture

Integrating waste activated sludge (WAS) acidification with denitrification by adding nitrite (NO2−)

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