Response of poly-phosphate accumulating organisms to free nitrous acid inhibition under anoxic and aerobic conditions

Zhou, Yan; Ganda, Lily; Lim, Melvin; Yuan, Zhiguo; Ng, Wun Jern

doi:10.1016/j.biortech.2012.03.111

Cited by 42 publications

(16 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, FNA was another inhibitor for PAOs (Zhou et al, , 2010. The growth of PAOs sharply decreased with increase of FNA concentration and completely stopped at FNA of 10 mg N L À1 (Zhou et al, 2012). It was concluded that FNA inhibited the key aerobic metabolic processes of PAOs, including the PHA oxidation, phosphorus uptake, and glycogen replenishment and growth.…”

Section: Low Phosphorus Removals In Partial Nitrification Systemmentioning

confidence: 95%

Detection of nitrifiers and evaluation of partial nitrification for wastewater treatment: A review

et al. 2015

View full text Add to dashboard Cite

Section: Low Phosphorus Removals In Partial Nitrification Systemmentioning

confidence: 95%

Detection of nitrifiers and evaluation of partial nitrification for wastewater treatment: A review

et al. 2015

View full text Add to dashboard Cite

“…Similar observations were also observed in other cycles. It was reported that aerobic SOP uptake was severely affected when FNA was 0.26 × 10 −3 mg HNO 2 -N/L7. Although the time with maximal FNA concentration was low and cyclic FNA level in the two reactors changed with time, it could be found that the average FNA level in the O/A/O/EI reactor was lower than that in the A/O/A/O reactor.…”

Section: Discussionmentioning

confidence: 90%

“…This is primarily because biological phosphorus removal in full-scale WWTPs usually occurs along with biological nitrogen removal, by which denitrifiers will compete with PAOs for the limited carbon sources available in wastewaters, the recycled mixtures will disturb the anaerobic circumstance, and some intermediates of nitrogen removal such as nitrite and free nitrous acid (FNA) will inhibit the metabolisms of PAOs. Among them, the effect of FNA on the metabolisms of PAOs has been drawn much attention recently owing to its strong inhibition on the activities of PAOs5678.…”

mentioning

confidence: 99%

An efficient process for wastewater treatment to mitigate free nitrous acid generation and its inhibition on biological phosphorus removal

Zhao

Wang

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Free nitrous acid (FNA), which is the protonated form of nitrite and inevitably produced during biological nitrogen removal, has been demonstrated to strongly inhibit the activity of polyphosphate accumulating organisms (PAOs). Herein we reported an efficient process for wastewater treatment, i.e., the oxic/anoxic/oxic/extended-idle process to mitigate the generation of FNA and its inhibition on PAOs. The results showed that this new process enriched more PAOs which thereby achieved higher phosphorus removal efficiency than the conventional four-step (i.e., anaerobic/oxic/anoxic/oxic) biological nutrient removal process (41 ± 7% versus 30 ± 5% in abundance of PAOs and 97 ± 0.73% versus 82 ± 1.2% in efficiency of phosphorus removal). It was found that this new process increased pH value but decreased nitrite accumulation, resulting in the decreased FNA generation. Further experiments showed that the new process could alleviate the inhibition of FNA on the metabolisms of PAOs even under the same FNA concentration.

show abstract

“…It has been reported that, at parts per billion (ppb) levels, FNA has inhibitory effects on: 1) the anabolic and catabolic activities of ammonia and nitrite oxidising bacteria [2,3]; 2) growth, nitrate and nitrite reduction activities of denitrifying bacteria in activated sludge [4] and 3) aerobic and anoxic phosphorus uptake by polyphosphate accumulating organisms [5,6]. In addition, FNA has also been shown to inhibit methanogens [7], pathogens [8] and yeast [9].…”

Section: Introductionmentioning

confidence: 99%

Producing free nitrous acid – A green and renewable biocidal agent – From anaerobic digester liquor

Law

Wang

et al. 2015

Chemical Engineering Journal

Self Cite

100

View full text Add to dashboard Cite

Recent studies have shown that free nitrous acid (FNA) at parts per million is strongly biocidal to a broad range of microorganisms involved in wastewater management. Applications have been developed, where FNA is used to deactivate anaerobic sewer biofilms thus suppressing sulfide and methane production in sewers, or to lyse secondary sludge resulting in reduced sludge production and enhanced biogas production. This study examines the feasibility of producing FNA from a waste stream namely the anaerobic sludge digestion liquor, thus providing a source of FNA for the above applications within wastewater systems. Complete nitritation was achieved in a lab scale sequencing batch reactor (SBR) treating reject wastewater. Under stable operation, the system sustained more than 90% conversion of the 1.0 and 0.8 g NH 4 + -N/L contained in the synthetic and real digester liquor, respectively, to nitrite. Each liter of this nitrite rich effluent 2 could be acidified to pH 2 with only 66 mmole of H + , due to the low level of alkalinity in the effluent. This converts almost all of the nitrite to FNA providing an ample source of FNA for sewer and sludge pretreatment applications. Despite the high nitrite concentration in the reactor, minimal N 2 O was produced with an emission factor of 0.08% of the ammonium nitrogen converted. Finally, an economical assessment of a theoretical full-scale installation for FNA production was conducted and compared with the costs of producing this FNA from a commercial nitrite supply.

show abstract

Response of poly-phosphate accumulating organisms to free nitrous acid inhibition under anoxic and aerobic conditions

Cited by 42 publications

References 36 publications

Detection of nitrifiers and evaluation of partial nitrification for wastewater treatment: A review

Detection of nitrifiers and evaluation of partial nitrification for wastewater treatment: A review

An efficient process for wastewater treatment to mitigate free nitrous acid generation and its inhibition on biological phosphorus removal

Producing free nitrous acid – A green and renewable biocidal agent – From anaerobic digester liquor

Contact Info

Product

Resources

About