1. Synergistic analysis of performance, functional genes, and microbial community assembly in SNDPR process under Zn(II) stress.
- Author
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Wu, Tong, Ding, Jie, Zhong, Le, Zhao, Yi-Lin, Sun, Han-Jun, Pang, Ji-Wei, Zhao, Lei, Bai, Shun-Wen, Ren, Nan-Qi, and Yang, Shan-Shan
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MICROBIAL communities , *WASTEWATER treatment , *HEAVY metals , *GENES , *NEAR infrared spectroscopy , *NITRIFICATION - Abstract
One of the most prevalent heavy metals found in rural sewage is Zn(II), while its effect on simultaneous nitrification, denitrification and phosphorus removal (SNDPR) remains unclear. In this work, the responses of SNDPR performance to long-term Zn(II) stress were investigated in a cross-flow honeycomb bionic carrier biofilm system. The results indicated that Zn(II) stress at 1 and 5 mg L−1 could increase nitrogen removal. Maximum ammonia nitrogen, total nitrogen, and phosphorus removal efficiencies of up to 88.54%, 83.19%, and 83.65% were obtained at Zn(II) concentration of 5 mg L−1. The functional genes, such as archaeal amoA, bacterial amoA, NarG, NirS, NapA, and NirK, also reached the highest value at 5 mg L−1 Zn(II), with the absolute abundances of 7.73 × 105, 1.57 × 106, 6.68 × 108, 1.05 × 109, 1.79 × 108, and 2.09 × 108 copies·g−1 dry weight, respectively. The neutral community model demonstrated that deterministic selection was responsible for the system's microbial community assembly. Additionally, response regimes with extracellular polymeric substances and cooperation among microorganisms facilitated the stability of the reactor effluent. Overall, the findings of this paper contribute to improving the efficiency of wastewater treatment. [Display omitted] • The responses of SNDPR to Zn(II) stress in the biofilm system was investigated. • Zn(II) stress at 5 mg/L could significantly stimulate SNDPR performance. • Deterministic selection drives the process of microbial community assembly. • Microbes were more cooperative (66.61%) than competitive (33.39%) in the system. • Both EPS and cooperation among microbes contribute to the systems' stability. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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