Evaluating the effects of Zn(II) on high-rate biogranule-based denitrification: Performance, microbial community and sludge characteristics. (May 2019)

• Record Type: Journal Article
• Authors: Cheng, Ya-Fei; Li, Gui-Feng; Liu, Ying-Yi; Zhu, Bing-Qian; Zhang, Qian; Xue, Yuan; Zhang, Zheng-Zhe; Jin, Ren-Cun
• Is Part Of: Bioresource technology. Volume 279(2019)
• Page Start: 393
• Page End: 397
• Publication Date: 2019-05
• Subjects: Denitrification -- Granular sludge -- Zn(II) -- Inhibition -- High-throughput sequencing -- 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.2019.02.005
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The suppression threshold of Zn(II) on reactor performance was 10 mg L −1 for long-term exposure. Castellaniella mainly was devoted to denitrification under no or low Zn(II) stress conditions. Klebsiella was the dominant denitrifying bacteria under high Zn(II) stress conditions. Abstract: High-rate denitrification is a popular and efficient process for treatment of nitrate-rich wastewater. Knowing the effect of heavy metals on denitrification is essential for industrial development. In the present study, the long-term impacts of Zn(II) on denitrifying granular sludge were investigated. The suppression threshold of Zn(II) on denitrifying bacteria was 10 mg L −1 for long-term exposure. The nitrogen removal rate was decreased by long-term addition of 10 mg L −1 Zn(II). Castellaniella and Klebsiella were the two dominant genera under Zn(II) stress. The relative abundance of Klebsiella sharply decreased to 4.64% after the addition of 10 mg L −1 Zn(II), whereas Castellaniella was susceptible to 2 mg L −1 Zn(II), revealing that Castellaniella mainly was devoted to denitrification under no or low Zn(II) stress conditions, whereas Klebsiella was effective under high Zn(II) stress.