Influence of elevated Zn (II) on Anammox system: Microbial variation and zinc tolerance. (March 2018)

• Record Type: Journal Article
• Authors: Zhang, Xiaojing; Chen, Zhao; Ma, Yongpeng; Zhou, Yue; Zhao, Siyu; Wang, Lina; Zhai, Hanfei
• Is Part Of: Bioresource technology. Volume 251(2018)
• Page Start: 108
• Page End: 113
• Publication Date: 2018-03
• Subjects: Nitrogen removal -- Anaerobia ammonium oxidation (Anammox) -- Zn (II) -- Anaerobic ammonia-oxidizing bacteria (AAOB) -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.12.035
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Zinc ion performed significant inhibition on Anammox process. AAOB had self-adaption to elevated Zn (II) in 1–10 mg L −1 . The irreversible suppression threshold on AAOB was 20 mg L −1 Zn (II). Zn (II) addition led to the biodiversity increase of Anammox system. Relative abundance of AAOB significantly rebounded after long-term acclimatization. Abstract: Nitrogen removal by anaerobic ammonium oxidation (Anammox) has attracted increasing attention in nowadays. An Anammox biofilter was subjected to a continuous loading of elevated Zn (II). The influence of Zn (II) on the nitrogen removal, microbial community and biofilm property was investigated in the condition of 23–26 °C and 3.5 h HRT. The nitrogen removal greatly decreased to 0.054 from the initial 0.502 kg m −3 d −1, with the Zn (II) addition. Anaerobic ammonia-oxidizing bacteria (AAOB) had self-adaption to Zn (II) in 1–10 mg L −1 and was significantly enhanced after long-term acclimatization, while the suppression threshold was 20 mg L −1 . Soluble microbial products (SMP) increased correspondingly with Zn (II), while extracellular polymeric substance (EPS) climbed up initially and then decreased. Anammox biofilm performed the highest zinc adsorption as 158.27 mg g −1 SS in biofilm. High Zn (II) improved the microbial diversity and lowered the Candidatus Kuenenia abuandance to 1.38% from 20.89%.