Characterization of Aerobic Denitrification Actinomycetes Strain Streptomyces Spp. During Landscape Water Treatment: Denitrification Performance and Carbon Source Metabolism

Actinomycetes are an essential component of the microbial community in aquatic ecosystems. The aerobic denitrification performance of actinomycetes in the polluted aquatic ecosystem was not understood clearly. Here, two strains of actinomycetes were separated and identified as Streptomyces sp. LJH-12-1 and Streptomyces diastatochromogenes LJH-12-2 could remove 94.18 %, and 96.17 % of organic carbon, 90.64 %, and 92.59 % of total nitrogen. Furthermore, strains LJH-12-1 and LJH-12-2 showed excellent aerobic denitrification performance (> 70 % removal efficiency of NO3--N) under the low carbon/nitrogen ratio conditions. Strains LJH-12-1 and LJH-12-2 revealed excellent carbon source metabolism activity. Strains LJH-12-1 and LJH-12-2 could remove 69.03 % and 54.38 % of total nitrogen, in the landscape raw water. Strains LJH-12-1 and LJH-12-2 could utilize aromatic proteins, soluble microbial products, and humic acid to drive aerobic denitrification processes. This study will provide a novel insight into utilizing aerobic denitrification actinomycetes to repair the polluted water.