Artificial Waterweed for Enhanced Denitrification of Black and Odorous Water-body with Low Carbon/Nitrogen Ratio:Effectiveness and Mechanism
Artificial waterweed,having good physical adsorption and biological affinity,can overcome the disadvantage of natural aquatic plants withering in winter,especially in northern areas.Therefore,in the treatment of black and odorous water bodies,artificial waterweed,which is able to to provide habitats for aquatic organisms and increase biodiversity,has been frequently used to achieve the objective of improving water quality.In order to explore the treatment effect and mechanism of different artificial waterweed enhanced microorganisms on low-carbon/nitrogen ratio black and odorous water bodies,experiments were conducted using four types of artificial waterweed which was combined with microbial strains,i.e.,Akoman ecological base,biological rope,integrated water-plant,and elastic three-dimensional fiber waterweed,to treat low-carbon/nitrogen ratio black and odorous water bodies,and the denitrification effectiveness and the relevant microbial diversity of them in the system were analyzed and compared one another.The findings of the experiments showed that the biological rope combined with microbial strains had the best effect on mitigating low-carbon/nitrogen black and odorous water bodies,with the removal rates of TN,NH3-N,and COD attaining 82.75％,85.93％,and 86.24％,respectively,being 21.70,25.02,and 6.96 percentage points higher than the removal rates(TN,NH3-N,and COD)of using microbial strains alone.Mi-crobial diversity indicates that the abundance of bacteria attached to the surface of biological ropes was higher than that of the other three types of artificial waterweed,and Proteobacteria and Actinobacteriota were the dominant bacterial phyla,while Rhodanobacter and Bacillus the dominant bacterial genera,the abundance of Firmicutes was significantly negatively correlated with NH3-N concentration,while the abundance of Comamonas was notably negatively correlated with COD concentration;on the other hand,the abundance of Bdellovibrio and norank_f_Blastocatellaceae was remarkably positive-ly correlated with COD concentration.It is hoped that the experimental results could provide reference for the treatment of black and odorous water bodies with low carbon/nitrogen ratios.
artificial waterweedmicrobial bacterialow carbon/nitrogen ratioblack and odorous water bodiesdenitrification
万方数据
维普
