Aerobic denitrification of oligotrophic source water driven by reduced metal manganese

Ruikang Xue; Tinglin Huang; Haihan Zhang; Shangye Yang; Nan Li; Daojun Huang

doi:10.1016/j.chemosphere.2023.137764

Aerobic denitrification of oligotrophic source water driven by reduced metal manganese

Chemosphere. 2023 Mar:317:137764. doi: 10.1016/j.chemosphere.2023.137764. Epub 2023 Jan 6.

Authors

Ruikang Xue¹, Tinglin Huang², Haihan Zhang¹, Shangye Yang¹, Nan Li¹, Daojun Huang³

Affiliations

¹ Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
² Shaanxi Key Laboratory of Environmental Engineering, Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China. Electronic address: huangtinglin@xauat.edu.cn.
³ Shaanxi Xi Xian New Area Water Affairs Group Co. LTD, Xianyang 712000, China.

PMID: 36623599
DOI: 10.1016/j.chemosphere.2023.137764

Abstract

The lack of organic electron donors limits the potential utility of aerobic denitrification in treatment of oligotrophic source water. Here, reduced manganese (Mn) was used as an inorganic electron donor to improve the denitrification of oligotrophic source water under the high dissolved oxygen condition (7-9 mg L^-1). Over 30 days, the total nitrogen removed by the treatment with reduced Mn was 76.21 ± 2.11% (maximum), substantially higher than that of the control treatment, which was 41.48 ± 2.33%. Furthermore, the addition of Mn resulted in the directional evolution of the microbial community. Water samples with Mn added showed a higher abundance of Limnohabitans, the dominant denitrifying genus, reaching 51.02%, 36.79%, and 20.19% (with 30, 50, and 70 g Mn, respectively), versus only 5.54% in the control. In biofilm, Mn promoted Hydrogenophaga and Brevundimonas growth while Pseudarthrobacter growth was promoted by 30 and 50 g Mn, but inhibited by 70 g Mn. This study demonstrates an improved performance in aerobic denitrification of water sources through the use of inorganic electron donors.

Keywords: Aerobic conditions; Electron donor; Micro-polluted raw water; Microbial community; Reduced manganese.

MeSH terms

Bacteria, Aerobic
Denitrification
Manganese
Microbiota*
Nitrates
Nitrogen
Water*

Substances

Water
Manganese
Nitrogen
Nitrates