Insight into continuous-flow partial nitrification granular sludge system: Long-term performance, formation mechanism, and partial nitrification granular sludge/Anammox coupled system for mature landfill leachate treatment

[Display omitted] •PNGS exhibited efficient NO2–-N accumulation under 200 mg N/L free NH3.•Effects of MLL on PN performance, genes abundance, enzymes activity were explored.•EPS secretion mediated by AHLs and c-di-GMP enhanced when treating MLL.•Enhanced EPS adsorbed refractory organics and embedded...

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Published in:Bioresource technology 2024-12, Vol.413, p.131501, Article 131501
Main Authors: Luo, Zhizhan, Chen, Bohan, Lei, Mengen, Li, Yong, Zhang, Naixin, Zhuang, Yeyou, Huang, Lusha, Li, Ji
Format: Article
Language:English
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Anammox
Bacterial communication
Granular sludge
Mature landfill leachate
Partial nitrification
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container_title Bioresource technology
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Chen, Bohan
Lei, Mengen
Li, Yong
Zhang, Naixin
Zhuang, Yeyou
Huang, Lusha
Li, Ji
description [Display omitted] •PNGS exhibited efficient NO2–-N accumulation under 200 mg N/L free NH3.•Effects of MLL on PN performance, genes abundance, enzymes activity were explored.•EPS secretion mediated by AHLs and c-di-GMP enhanced when treating MLL.•Enhanced EPS adsorbed refractory organics and embedded SiO2 for granulation.•PNGS/Anammox system could simultaneously remove COD and TIN in MLL. A continuous-flow partial nitrification granular sludge (PNGS) coupled Anammox system was constructed for mature landfill leachate (MLL) treatment. Stable NO2–-N accumulation was achieved with NH4+-N to NO2–-N transformation ratio (NTR) of 98–100 % with influent NH4+-N ranged from 342 ± 29 to 1106 ± 20 mg/L. When treating MLL, particular acyl homoserine lactones (AHLs), cyclic dimeric guanosine monophosphate (c-di-GMP) concentration significantly increased and more extracellular polymeric substances (EPS) were secreted, which adsorbed refractory organics and embedded SiO2 derived from MLL for granulation. A strong and positive correlation was found between PNGS average diameter and EPS, indicating that AHLs and c-di-GMP may play a significant role in the formation and evolution of PNGS via regulating EPS secretion. The PNGS/Anammox system could remove COD and nitrogen simultaneously under different MLL loadings, with COD and total inorganic nitrogen removal efficiency of 28 ± 5 %-71 ± 2 % and 66 ± 2 %-89 ± 1 %, respectively.
doi_str_mv 10.1016/j.biortech.2024.131501
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A continuous-flow partial nitrification granular sludge (PNGS) coupled Anammox system was constructed for mature landfill leachate (MLL) treatment. Stable NO2–-N accumulation was achieved with NH4+-N to NO2–-N transformation ratio (NTR) of 98–100 % with influent NH4+-N ranged from 342 ± 29 to 1106 ± 20 mg/L. When treating MLL, particular acyl homoserine lactones (AHLs), cyclic dimeric guanosine monophosphate (c-di-GMP) concentration significantly increased and more extracellular polymeric substances (EPS) were secreted, which adsorbed refractory organics and embedded SiO2 derived from MLL for granulation. A strong and positive correlation was found between PNGS average diameter and EPS, indicating that AHLs and c-di-GMP may play a significant role in the formation and evolution of PNGS via regulating EPS secretion. The PNGS/Anammox system could remove COD and nitrogen simultaneously under different MLL loadings, with COD and total inorganic nitrogen removal efficiency of 28 ± 5 %-71 ± 2 % and 66 ± 2 %-89 ± 1 %, respectively.</description><identifier>ISSN: 0960-8524</identifier><identifier>ISSN: 1873-2976</identifier><identifier>EISSN: 1873-2976</identifier><identifier>DOI: 10.1016/j.biortech.2024.131501</identifier><identifier>PMID: 39299345</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Anammox ; Bacterial communication ; Granular sludge ; Mature landfill leachate ; Partial nitrification</subject><ispartof>Bioresource technology, 2024-12, Vol.413, p.131501, Article 131501</ispartof><rights>2024 Elsevier Ltd</rights><rights>Copyright © 2024. Published by Elsevier Ltd.</rights><rights>Copyright © 2024 Elsevier Ltd. 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subjects Anammox
Bacterial communication
Granular sludge
Mature landfill leachate
Partial nitrification
title Insight into continuous-flow partial nitrification granular sludge system: Long-term performance, formation mechanism, and partial nitrification granular sludge/Anammox coupled system for mature landfill leachate treatment
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