High-rate partial-nitritation and efficient nitrifying bacteria enrichment/out-selection via pH-DO controls: Efficiency, kinetics, and microbial community dynamics

Zhang, Dachao; Su, Hao; Antwi, Philip; Xiao, Longwen; Liu, Zuwen; Li, Jianzheng

doi:10.1016/j.scitotenv.2019.07.308

Cited by 56 publications

(21 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32,33 The recover of reactor depends on a practicable strategy to balance the AOB, AMMOX, DO concentration and pH value. 34 In this study, nitrite was remained at <60 mg L -1 after 38 days cultivation in the CANON and the combined system could still be recovered by increasing influent ammonium or decreasing aeration although nitrite high to 110 mg L -1 . According to the previous study of DO on the effect to nitritation in the ZBAF, a concentration in the range of 4.0--6.0 mg L -1 can maintain highly effective nitritation.…”

Section: Do and Aeration Intensitymentioning

confidence: 50%

“…Moreover, high‐strength aeration can easily cause nitrite accumulation and anammox activity would be lost completely when the anammox bacteria exposed to a 100 mg L –1 nitrite solution ; indeed, some studies found that a nitrite concentration of 40 mg L –1 over several days can lead to irreversible inactivation 32, 33 . The recover of reactor depends on a practicable strategy to balance the AOB, AMMOX, DO concentration and pH value 34 . In this study, nitrite was remained at <60 mg L –1 after 38 days cultivation in the CANON and the combined system could still be recovered by increasing influent ammonium or decreasing aeration although nitrite high to 110 mg L –1 .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Feng

Wang

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: The completely autotrophic nitrogen removal over nitrite (CANON) system has excellent performance in treating ammonium-rich wastewater and it depends on ammonia oxidizing bacteria (AOB) working together with anammox bacteria in a reactor. Higher ammonium nitrogen loading requires higher aeration to provide sufficient dissolved oxygen (DO) for nitritation, whereas high-strength aeration in theCANON will destroy the sludge structure and inhibit the activity of anammox bacteria. The present study uses a stable pre-nitritation system to reduce a part of nitritation and also decrease aeration intensity in the CANON. RESULTS: Continuous aeration to maintain the DO concentration between 1.5 and 4.3 mg L-1 in the CANON achieved a stable nitrogen removal rate (1.22 kg N m-3 d-1) from iron oxide red wastewater with 400-1016 mg N L-1 after 183 days of operation. Using a mixed alkalinity donor [sodium carbonate (Na 2 CO 3) and bicarbonate (NaHCO 3)] in the combined system can save ≈14.1-28.2% of the alkalinity cost compared with using NaHCO 3 only. CONCLUSIONS: A zeolite biofilm aeration filter (ZBAF) used in a pre-nitritation process can tolerate high DO concentration of ≤6.5 mg L-1 for nitritation and avoid all of the nitritation taking place in the CANON system. This can protect the sludge structure and anammox bacteria from high-strength aeration erosion.

show abstract

Section: Do and Aeration Intensitymentioning

confidence: 50%

Section: Resultsmentioning

confidence: 99%

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Feng

Wang

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…Based on real-time control of blower frequency and pH, Gu et al [19] spent 40 days elevating the NAR of a pilot SBR from 19.8% to 90%. Zhang et al [20] proposed a novel pH-DO control strategy and observed apparent NOB inhibition and the promotion of AOB after 33 days of operation, while the NAR increased to 90%. In this study, the NAR increased stepwise and reached 90.0% at the 23rd cycle, indicating that NOB inhibition in the ZSBR was successful.…”

Section: Start-up Periodmentioning

confidence: 99%

“…Pacek et al [23] achieved nitritation in an SBR after 23 days of operation with a low NLR (0.3 kg N•m −3 •d −1 ), but the nitritation was not stable and was eliminated in 180 days. Dachao et al [20] spend 60 days to achieve stable nitritation in high-strength ammonia synthesis WW with an NLR of 0.78 kg N•m −3 •d −1 and an NAR > 95.0%. Compared to their study, achieving nitritation of LMWW via a ZSBR required only 7 days of operation and the highest ARR of the ZSBR was 1.12 kg N•m −3 •d −1 .…”

Section: Start-up Periodmentioning

confidence: 99%

Nitrogen Removal for Liquid-Ammonia Mercerization Wastewater via Partial Nitritation/Anammox Based on Zeolite Sequencing Batch Reactor

Zheng

Chen

Zhou

et al. 2020

Water

View full text Add to dashboard Cite

Liquid-ammonia mercerization is commonly used to enhance the quality of cotton fabric in the textile industry, resulting in a large amount of liquid-ammonia mercerization wastewater (LMWW) containing high concentration of ammonia to be disposed of. This study proposes a partial nitritation/anammox (PN/A) process based on stable nitritation by a zeolite sequencing batch reactor (ZSBR) for the nitrogen removal of LMWW. The ZSBR could quickly achieve stably full nitritation with a nitrite accumulation ratio higher than 97% and an ammonia removal rate of 0.86 kg N·m−3·d−1 for the raw LMWW with an ammonia level of 1490 mg/L. In order to avoid anammox inhibition by free nitrous acid, the ZSBR was successfully changed to PN operation with diluted LMWW for effluent meeting anammox requirements. The next anammox reactor (an up-flow blanket filter (UBF)) realized a total nitrogen removal efficiency of 70.0% with a NLR (nitrogen loading rate) of 0.82 kg N·m−3·d−1 for LMWW. High-throughput sequencing analysis results indicated that Nitrosomonas and Candidatus Kuenenia were the dominant bacteria in ZSBR and UBF, respectively. All results revealed that the PN/A process based on ZSBR as the PN pretreatment process was feasible for LMWW, facilitating cost-effective and low-carbon nitrogen removal for LMWW treatment in the textile industry in the future.

show abstract

“…Therefore, AOO enrichment is completed and Nitrifier functions are separated, but this regulation is not stable. Zhang et al realized the enrichment of AOO from 0.08% to 49% with DO of 0.2 mg-O/L (Zhang et al 2019a(Zhang et al , 2019b, however, the activity of NOO will recover once DO increased, resulting in the instability of Nitrifier structure (Hanaki et al 1990).…”

Section: Introductionmentioning

confidence: 99%

The effect of sludge retention time (SRT) on the Nitrifier typical kinetics at ambient temperature under the low ammonia density

Liu

et al. 2021

Water Science and Technology

View full text Add to dashboard Cite

Sludge retention time (SRT) regulation is one of the essential management techniques for refined control of the main-sidestream treatment process under the low ammonia density. It is indispensable to understand the effect of SRTs changes on the Nitrifier kinetics to obtain the functional separation of the Nitrifier and the refined control of the nitrification process. In this study, Nitrifier was cultured with conditions of 35 ± 0.5 °C, pH 7.5 ± 0.2, DO 5.0 ± 0.5 mg-O/L, and SRTs was controlled for 40 d, 20 d, 10 d, and 5 d. The net growth rate (), decay rate (), specific growth rate (), the yield of the Nitrifier (), temperature parameter (), and inhibition coefficient () have been measured and extended with the SRT decreases. Instead, the half-saturation coefficient () decreased. In addition, the limited value of pH inhibition occurs (), and the pH of keeping 5% maximum reaction rate () was in a relatively stable state. The trade of kinetics may be induced by the species structure of Nitrifier changed. The Nitrosomonas proportion was increased, and the Nitrospira used to be contrary with the SRT decreasing. It is a match for the functional separation of Nitrifier when SRTs was 20 d at ambient temperature under the low ammonia density. The kinetics of ammonia-oxidizing organism (AOO) and nitrite-oxidizing organism (NOO) in Nitrifier under different SRT conditions should be measured respectively to the refined control of the partial nitrification process in the future study. HIGHLIGHT The Nitrifier typical kinetics used to be affected notably by way of SRTs changes. The species structure of the Nitrifier was recognized beneath distinctive SRTs. The change of Nitrifier kinetics with SRTs used to be estimated by the species structure changes.

show abstract

High-rate partial-nitritation and efficient nitrifying bacteria enrichment/out-selection via pH-DO controls: Efficiency, kinetics, and microbial community dynamics

Cited by 56 publications

References 51 publications

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Zeolite biofilm aeration filter plays a pre‐nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

Nitrogen Removal for Liquid-Ammonia Mercerization Wastewater via Partial Nitritation/Anammox Based on Zeolite Sequencing Batch Reactor

The effect of sludge retention time (SRT) on the Nitrifier typical kinetics at ambient temperature under the low ammonia density

Contact Info

Product

Resources

About