The harmful algal blooms (HABs) can damage the ecological equilibrium of aquatic ecosystems and threaten human health. The bio-degradation of algal by algicidal bacteria is an environmentally friendly and economical approach to control HABs. This study applied an aerobic denitrification synchronization algicidal strain Streptomyces sp. LJH-12-1 (L1) to control HABs. The cell-free filtrate of the strain L1 showed a great algolytic effect on bloom-forming cyanobacterium, Microcystis aeruginosa (M. aeruginosa). The optimal algicidal property of strain L1 was indirect light-dependent algicidal with an algicidal rate of 85.0%. The functional metabolism, light-trapping, light-transfer efficiency, the content of pigments, and inhibition of photosynthesis of M. aeruginosa decreased after the addition of the supernatant of the strain L1 due to oxidative stress. Moreover, 96.05% nitrate removal rate synchronized with algicidal activity was achieved with the strain L1. The relative abundance of N cycling functional genes significantly increased during the strain L1 effect on M. aeruginosa. The algicidal efficiency of the strain L1 in the raw water was 76.70% with nitrate removal efficiency of 81.4%. Overall, this study provides a novel route to apply bacterial strain with the property of denitrification coupled with algicidal activity in treating micro-polluted water bodies.

Aquatic EcoHealth Group Key Laboratory of Urban Environment and Health Fujian Key Laboratory of Watershed Ecology Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China

Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province Xi'an University of Architecture and Technology Xi'an 710055 China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains 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

Department of Applied Ecology Faculty of Environmental Sciences Czech University of Life Sciences Prague Kamýcká 129 Praha Suchdol 16500 Czech Republic

Department of Biological Sciences Xi'an Jiaotong Liverpool University Suzhou 215123 China

Department of Civil and Environmental Engineering the Pennsylvania State University USA

Papanin Institute for Biology of Inland Waters of Russian Academy of Sciences 109 Borok Nekouz Yaroslavl 152742 Russia

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