Nitrogen removal by a Hydroxyapatite-enhanced Micro-granule type One-stage partial Nitritation/anammox process following anaerobic membrane bioreactor treating municipal wastewater

Chen, Yujie; Feng, Gaoxuefeng; Guo, Guangze; Luo, Zibing; Rong, Chao; Wang, Tianjie; Guo, Yan; Li, Yu-You

doi:10.1016/j.biortech.2022.126740

Cited by 12 publications

(1 citation statement)

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“…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%

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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