Efficiency and mechanism of controlling phosphorus release from sediment using a biological aluminum-based P-inactivation agent  

作　　者：Changxiong Chen Fei Li Chunhua Shen Xueping Tang Mazhan Zhuang Zhenming Zhou Denghong Wang 

机构地区：[1]College of Civil Engineering,Huaqiao University,Xiamen 361021,China [2]Xiamen Institute of Environmental Science,Xiamen 361021,China [3]College of Civil Engineering and Architecture,Zhejiang Tongji Vocational College of Science and Technology,Hangzhou 311231,China

出　　处：《Journal of Environmental Sciences》2025年第4期594-603,共10页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.51878300);the National Natural Science Foundation of Xiamen City(No.3502Z202373041);the Water Conservancy Science and Technology Plan Project(No.RC2127).

摘　　要：Eutrophication is a significant challenge for surface water,with sediment phosphorus(P)release being a key contributor.Although biological aluminum-based P-inactivation agent(BA-PIA)has shown effectiveness in controlling P release from sediment,the efficiency and mechanism by BA-PIA capping is still not fully understood.This study explored the efficiency and mechanism of using BA-PIA capping controlling P release from sediment.The main mechanisms controlling P release from sediment via BA-PIA capping involved transforming mobile and less stable fractions into stable ones,passivating DGT-labile P and establishing a 13 mm’P static layer’within the sediment.Additionally,BA-PIA’s impact on Fe redox processes significantly influenced P release from the sediment.After BA-PIA capping,notable reductionswere observed in total P,soluble reactive P(SRP),and diffusive gradient in thin-films(DGT)-measured labile P(DGT-labile P)concentration in the overlying water,with reduction rates of 95.6%,92.7%,and 96.5%,respectively.After BA-PIA capping,the diffusion flux of SRP across the sediment-water interface and the apparent P diffusion flux decreased by 91.3%and 97.8%,respectively.Additionally,BA-PIA capping led to reduced concentrations of SRP,DGT-labile P,and DGT-measured labile Fe(II)in the sediment interstitial water.Notably,BA-PIA capping significantly reduced P content and facilitated transformation in the 0∼30 mm sediment layers but not in the 30∼45 mm and 45∼60 mm sediment layers for NaOH-extractable inorganic P and HCl-extracted P.These findings offer a theoretical basis and technical support for the practical application of BA-PIA capping to control P release from sediment.

关 键 词：Biological aluminum-based p-inactivation agent Active capping SEDIMENT Phosphorus release 

分 类 号：X703[环境科学与工程—环境工程]