Mix-cultured Aerobic Denitrifying Bacteria Augmented Carbon and Nitrogen Removal for Micro-Polluted Water: Metabolic Activity, Coexistence and Interactions, and Immobilized Bacteria for Reservoir Raw Water Treatment.
Science of the total environment(2022)
摘要
Less attention has been paid on the oligotrophic water body nitrogen treatment with mix-cultured aerobic denitrifying bacteria (Mix-CADB). In this study, three Mix-CADB communities were screened from the sediments of reservoirs. The nitrate and dissolved organic carbon (DOC) removal efficiencies of Mix-CADB communities were higher than 92 % and 91 %, respectively. Biolog results suggested that Mix-CADB communities displayed excellent carbon source metabolic activity. The nirS gene sequencing indicated that Pseudomonas sp. and Pseudomonas stutzeri accounted for more proportions in the core species of three Mix-CADB communities. The network model revealed that Pseudomonas sp. and Pseudomonas stutzeri mainly drove the total nitrogen and DOC removal of Mix-CADB communities. More importantly, the immobilized Mix-CADB communities could reduce >91 % nitrate in the adjusted reservoir raw water. Overall, this study showed that the three Mix-CADB communities could be regarded as potential candidates for the nitrogen treatment in oligotrophic water body ecosystems.
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关键词
Aerobic denitrifying bacteria,Mix-cultured,nirS-type denitrifying bacterial communities,Bacterial interactions,Immobilized denitrifying bacteria
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