Four kinds of capping materials for controlling phosphorus and nitrogen release from contaminated sediment using a static simulation experiment  

作　　者：Zhenming Zhou Canyang Lin Shuwen Li Shupo Liu Fei Li Baoling Yuan 

机构地区：[1]College of Civil Engineering,Huaqiao University,Xiamen 361021,China

出　　处：《Frontiers of Environmental Science & Engineering》2022年第3期25-33,共9页环境科学与工程前沿（英文）

基　　金：supported by the National Natural Science Fund of China(Grant No.51878300);the Natural Science Foundation of Fujian Province of China(Grant No.2019J01052);Project of production,study and research of colleges and universities of Xiamen City(Grant No.3502Z20203044).

摘　　要：We determined the effects of quartz sand(QS),water treatment plant sludge(WTPS),aluminum-based P-inactivation agent(Al-PIA),and lanthanum-modified bentonite(LMB)thin-layer capping on controlling phosphorus and nitrogen release from the sediment,using a static simulation experiment.The sediment in the experiment was sampled from Yundang Lagoon(Xiamen,Fujian Province,China),which is a eutrophic waterbody.The total phosphorus(TP),ammonium nitrogen(NH4+-N),and total organic carbon(TOC)levels in the overlying water were measured at regular intervals,and the changes of different P forms in WTPS,Al-PIA,and sediment of each system were analyzed before and after the test.The average TP reduction rates of LMB,Al-PIA,WTPS,and QS were 94.82,92.14,86.88,and 10.68%,respectively,when the release strength of sediment TP was 2.26–9.19 mg/(m^(2)·d)and the capping strength of the materials was 2 kg/m^(2).Thin-layer capping of LMB,WTPS,and Al-PIA could effectively control P release from the sediment(P<0.05).However,thin-layer capping of LMB,Al-PIA,and QS did not significantly reduce the release of ammonium N and organic matter(P>0.05).Based on our results,LMB,Al-PIA,and WTPS thin-layer capping promoted the migration and transformation of easily released P in sediment.The P adsorbed by WTPS and Al-PIA mainly occurred in the form of NAIP.

关 键 词：SEDIMENT EUTROPHICATION Thin-layer capping PHOSPHORUS NITROGEN Aluminum-based P-inactivation agent 

分 类 号：X50[环境科学与工程—环境工程]