大型海藻-硝化细菌共培养处理养殖尾水的研究OA北大核心CSCDCSTPCD

The efficient removal of nitrate and phosphate is challenging for the treatment of eutrophicated aquacul-ture effluents.Existing studies have indicated that the combination of algae and bacteria for effluent treatment can enhance the efficiency of biological processes;however,microalgae are predominantly used.In this study,we con-structed algal-bacterial aggregates using the asexual strain of the macroalga Ulva pertusa and nitrifying bacteria,and these aggregates were then applied to treat simulated aquaculture effluents.The results revealed that the al-gal-bacterial aggregates significantly outperformed the single-bacterial group for the removal of nitrogen and phosphorus pollutants,with removal rates of NH4⁺-N and PO43⁻-P reaching 99.2%and 98.2%,respectively.Fur-thermore,they exhibited superior removal rates compared to the single-algal group.Compared with the single-algal group,the contents of chl a,chl b,and carotenoids in U.pertusa within the algal-bacterial aggregates increased by 65.4%,37.8%,and 56.7%,respectively.In addition,the growth capacity and photosynthetic activity of U.pertusa were further enhanced.These findings indicate the existence of a mutualistic mechanism between macroalgae and nitrifying bacteria.Moreover,their synergistic action improved the removal efficiency of inorganic nitrogen and phosphorus in aquaculture effluents and increased the dissolved oxygen in the water.Overall,this is a highly effi-cient and feasible method for the treatment of aquaculture effluents.