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Synergistic toxic effects of high-strength ammonia and ZnO nanoparticles on biological nitrogen removal systems and role of exogenous C10-HSL regulation.
Zhao, Runyu; Gao, Huan; Duan, Lijie; Yu, Ran.
Afiliación
  • Zhao R; Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water Environment, Southeast University, Nanjing 210096, China; Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nan
  • Gao H; Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water Environment, Southeast University, Nanjing 210096, China; Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nan
  • Duan L; Guangdong Institute of Socialism, Guangzhou 510400, China.
  • Yu R; Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water Environment, Southeast University, Nanjing 210096, China; Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nan
J Environ Sci (China) ; 150: 385-394, 2025 Apr.
Article en En | MEDLINE | ID: mdl-39306414
ABSTRACT
The inhibitory effects of zinc oxide nanoparticles (ZnO NPs) and impacts of N-acyl-homoserine lactone (AHL)-based quorum sensing (QS) on biological nitrogen removal (BNR) performance have been well-investigated. However, the effects of ammonia nitrogen (NH4+-N) concentrations on NP toxicity and AHL regulation have seldom been addressed yet. This study consulted on the impacts of ZnO NPs on BNR systems when high NH4+-N concentration was available. The synergistic toxic effects of high-strength NH4+-N (200 mg/L) and ZnO NPs resulted in decreased ammonia oxidation rates and dropped the nitrogen removal efficiencies by 17.5% ± 0.2%. The increased extracellular polymeric substances (EPS) production was observed in response to the high NH4+-N and ZnO NP stress, which indicated the defense mechanism against the toxic effects in the BNR systems was stimulated. Furthermore, the regulatory effects of exogenous N-decanoyl-homoserine lactone (C10-HSL)-mediated QS system on NP-stressed BNR systems were revealed to improve the BNR performance under different NH4+-N concentrations. The C10-HSL regulated the intracellular reactive oxygen species levels, denitrification functional enzyme activities, and antioxidant enzyme activities, respectively. This probably synergistically enhanced the defense mechanism against NP toxicity. However, compared to the low NH4+-N concentration of 60 mg/L, the efficacy of C10-HSL was inhibited at high NH4+-N levels of 200 mg/L. The findings provided the significant application potential of QS system for BNR when facing toxic compound shock threats.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Óxido de Zinc / Percepción de Quorum / Amoníaco / Nitrógeno Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2025 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Óxido de Zinc / Percepción de Quorum / Amoníaco / Nitrógeno Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2025 Tipo del documento: Article Pais de publicación: Países Bajos