Synergetic association of hydroxyapatite-mediated biofilm and suspended sludge enhances resilience of partial nitrification/anammox (PN/A) system treating high-strength anaerobic membrane bioreactor (AnMBR) permeate

[Display omitted] •High-strength AnMBR permeate was treated by a single-stage PN/A with biocarriers.•A suitable Ca/P ratio in AnMBR permeate promoted Hydroxyapatite (HAP) formation.•HAP enhanced the attachment of biofilm and the settleability of suspended sludge.•Synergetic association of HAP mediat...

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Veröffentlicht in:Bioresource technology 2024-11, Vol.412, p.131391, Article 131391
Hauptverfasser: Li, Qian, Zhao, Wenzhao, Cui, Shen, Gadow, Samir I., Qin, Yu, Li, Yu-You
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Sprache:eng
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Zusammenfassung:[Display omitted] •High-strength AnMBR permeate was treated by a single-stage PN/A with biocarriers.•A suitable Ca/P ratio in AnMBR permeate promoted Hydroxyapatite (HAP) formation.•HAP enhanced the attachment of biofilm and the settleability of suspended sludge.•Synergetic association of HAP mediated biofilm and suspended sludge was confirmed.•PN/A rapidly recovered from FNA inhibition with a flush strategy. A single-stage partial nitrification/anammox (PN/A) system with biocarriers was used to treat the permeate from an anaerobic membrane reactor (AnMBR) processing organic fraction of municipal solid wastes. The suitable Ca/P ratio and high pH in the AnMBR permeate facilitated hydroxyapatite (HAP) formation, enhancing the biofilm attachment and the settleability of suspended sludge. This maintained sufficient biomass and a stable microbial structure after flushing to mitigate the free nitrous acid inhibition. Robust anammox bacteria in the biofilm and ammonia-oxidizing bacteria in the suspended sludge ensured that the PN/A system achieved an 87.3 % nitrogen removal efficiency at an influent NH4+-N concentration of 1802 mg/L. This study demonstrates that AnMBR permeate with high Ca, P and NH4+-N content is suitable for single-stage PN/A system with biocarriers due to the high resilience enhanced by HAP, offering a reference for the treatment of high-strength AnMBR permeate.
ISSN:0960-8524
1873-2976
1873-2976
DOI:10.1016/j.biortech.2024.131391