缓释除磷材料在低污染负荷湖库水体中长效控磷效果OACSTPCD

According to the data from the 2022 China Ecological Environment Status Bulletin,the main environmental pollution factor of lakes and reservoirs in China is total phosphorus.Although there are various phosphorus removal materials currently available,their practical applications are susceptible to interference from complex environments,resulting in performance differences compared to laboratory data.Therefore,it is crucial to select a phosphorus removal material with strong adaptability and good purification effects.In this study,efficient sustained-release phosphorus removal material was added to the enclosed water body of 1 000 m2 on the north bank of Jiaxing South Lake,and the total phosphorus concentration in the study area was tracked and detected for one year.The results showed that the original water body had fluctuations in total phosphorus concentration around 0.05 mg/L due to the death and decay of submerged plants and water exchange with external rivers,failing to meet class 111 water quality requirements.After adding the efficient sustained-release phosphorus removal material,the total phosphorus concentration in the experimental area remained stable between 0.02～0.05 mg/L for one year,except for fluctuations caused by water exchange and sediment disturbance during rainfall events.In contrast,the total phosphorus concentration in the non-experimental areas fluctuated between 0.03～0.10 mg/L and 0.04～0.14 mg/L.Additionally,the addition of the efficient sustained-release phosphorus removal material had no significant impact on dissolved oxygen,pH,ammonia nitrogen,and permanganate index.Through field application and continuous monitoring,this study demonstrates the long-term effectiveness of the material in reducing total phosphorus concentration in lake and reservoir waters,providing a new solution and approach for eutrophication control.