Key factors improving the stability and the loading capacity of nitrogen removal in a hydroxyapatite (HAP)-enhanced one-stage partial nitritation/anammox process

Chen, Yujie; Guo, Yan; Feng, Gaoxuefeng; Urasaki, Kampachiro; Guo, Guangze; Qin, Yu; Kubota, Kengo; Li, Yu-You

doi:10.1016/j.cej.2022.139589

Cited by 21 publications

(5 citation statements)

References 44 publications

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“…The IC removal performance is shown in Figure S1. The average ratio of consumed IC to removed nitrogen (ΔIC/ΔN) was 1.19 ± 0.10, which approximated to the results of a previous study, 10 and below which, the addition of IC in the influent might be necessary. In addition, the ΔIC/ΔN ratio did not increase under high calcium addition, indicating that HAP formation was still prior to calcium carbonate formation.…”

Section: Nitrogen Removal Performancesupporting

confidence: 83%

“…In this study, the PRR was used to indicate the formation of HAP, the inorganic part, and NRR was used to indicate the biomass growth, the organic part, in the granular sludge. The desired minimum PRR depended on the NRR to get a PRR/NRR higher than the threshold of approximately 0.02, lower than which the HAP would be insufficient in the newly formed granular sludge and the settleability would get worse . Therefore, there is no fixed minimum calcium addition and minimum PRE, which should be adjusted following the change of the NRR.…”

Section: Resultsmentioning

confidence: 99%

“…The desired minimum PRR depended on the NRR to get a PRR/ NRR higher than the threshold of approximately 0.02, lower than which the HAP would be insufficient in the newly formed granular sludge and the settleability would get worse. 10 Therefore, there is no fixed minimum calcium addition and minimum PRE, which should be adjusted following the change of the NRR. In the stable stage, with increased calcium addition, the PRR/NRR ratio increased from 0 to greater than 0.02 to ensure sufficient HAP formation.…”

Section: Phosphorus Removal Performancementioning

confidence: 99%

“…Although the importance of HAP formation on sludge settleability and MLVSS was recently assessed at a fixed hydraulic retention time (HRT), the evolution and characteristics of the HAP granular sludge under a decreasing and low HRT, which will meet the challenges of sludge washout with high flow velocities, have not yet been reported. , In addition, if not considering phosphorus removal, reports on HAP-based granular sludge providing a clear advantage in terms of sludge settleability, MLVSS, or nitrogen removal rate (NRR) over other granular sludge systems are lacking. Moreover, optimal sludge management to achieve the desired performance as detailed above is essential for the engineering application of the HAP-enhanced system in the future …”

Section: Introductionmentioning

confidence: 99%

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Improved Properties and Enhancement Strategies of Hydroxyapatite-Based Functional Granular Sludge for a High-Rate Partial Nitritation/Anammox System

Chen

Feng

Guo

et al. 2023

Environ. Sci. Technol.

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Retaining sufficient anammox bacteria (AnAOB) while keeping the anammoxbased process stable is the focus of the study of anammox technology, especially in a one-stage partial nitritation/anammox (PNA) process. The use of hydroxyapatite (HAP) granules in an anammox-based process is innovative for its potential to improve the nitrogen removal rate and achieve simultaneous removal of phosphorus. In this study, the HAP-based granular sludge was employed using enhancement strategies for an excellent nitrogen removal performance in a onestage PNA process. Compared to those of other granular sludge PNA systems, a remarkable sludge volume index of 7.8 mL/g and an extremely high mixed liquor volatile suspended solids of 15 g/L were achieved under a low hydraulic retention time of 2 h. Consequently, an unprecedented nitrogen removal rate as high as 4.8 kg N/m 3 /d at 25 °C was obtained under a nitrogen loading rate of 6 kg N/m 3 /d. After a long-term operation of 870 days, the enhancement strategies underlying the superior performance of the granular sludge were identified. These findings clearly demonstrate that the enhancement strategies are crucial for the superior operating performance of the PNA process, and they can promote the application of the anammox-based process.

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Section: Nitrogen Removal Performancesupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Phosphorus Removal Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Properties and Enhancement Strategies of Hydroxyapatite-Based Functional Granular Sludge for a High-Rate Partial Nitritation/Anammox System

Chen

Feng

Guo

et al. 2023

Environ. Sci. Technol.

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“…A novel granular sludge, Anammox-hydroxyapatite (HAP) has recently been shown a lot of advantage such as higher active, more compact, and higher settling velocity (higher than 200 m/h) 13,14) than other kinds of granules. If the advantages can be retained after long-term storage, it will greatly improve the storage time of anammox sludge and facilitate the subsequent rapid start-up.…”

Section: Introductionmentioning

confidence: 99%

Effects of Storage Methods Andperiods on the Activity of Anammox-Hap Granules

ZHOU,

XUE,

2023

Journal of JSCE

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Due to the big challenge to rapid start-up of full-scale anammox (anaerobic ammonium oxidation) processes, preserving active anammox biomass has been paid more and more attention. In this study, Anammox-HAP granules were cultured in an expanded granular sludge bed (EGSB) reactor, and then the granules were preserved at different methods during 1 d to 6 years.There are 4 different storage methods have been used for short-term storage. The results proved that the most economical method of storage for one week was room temperature without media, where about 80% of the specific anammox activity (SAA) is retained. For more than one month, the effect of low temperature storage at 4℃ is significantly better than that of room temperature storage. As to the storage of more than three months, 4℃ and molybdate addition had better preservation effect on SAA. During the preservation period, a first order exponential decay model may be used to simulate the decay of the anammox activity.The results showed that Anammox-HAP granules still retained a high biomass and settling velocity during long-term storage in 6 years, and SAA retained more than 50% after half a year of storage. The results demonstrated that, compared with the ordinary anammox granular sludge, Anammox-HAP granules had better active and biomass preservation ability and retained its own superiority after long-term storage, which provides the feasibility for quick start-up of anammox process.

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Biochar‐Assisted Anaerobic Ammonium Oxidation

Tian,

Tang,

et al. 2023

Biochar Applications for Wastewater Treatment

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Key factors improving the stability and the loading capacity of nitrogen removal in a hydroxyapatite (HAP)-enhanced one-stage partial nitritation/anammox process

Cited by 21 publications

References 44 publications

Improved Properties and Enhancement Strategies of Hydroxyapatite-Based Functional Granular Sludge for a High-Rate Partial Nitritation/Anammox System

Improved Properties and Enhancement Strategies of Hydroxyapatite-Based Functional Granular Sludge for a High-Rate Partial Nitritation/Anammox System

Effects of Storage Methods Andperiods on the Activity of Anammox-Hap Granules

Biochar‐Assisted Anaerobic Ammonium Oxidation

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