Release and redistribution of hexabromocyclododecane in sediments under different flow velocities
WANG Rong, HU Yu, GAO Han, WANG Chao, WANG Pei-fang, CHEN Juan
Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
Abstract：Hexabromocyclododecane (HBCD), a typical halogenated organic pollutant, has been widely detected in river and lake sediments, but how its migration and release behaviors vary with flow velocity still remains unclear. In this paper, five flow velocities were simulated to characterize the release of HBCD from surface sediments and its redistribution in water-sediment systems. The results show that the 0.4m/s was a critical flow velocity of sedimentary resuspension, and the concentration of HBCD in overlying water increased with flow velocity. The processes of HBCD releasing into overlying water under different flow velocities were in accordance with the quasi-second-order kinetic model. The concentration of HBCD in suspended solid (SS) was not affected by flow velocity changes, which was different from the overlying water. The total amount of HBCD release from the sediment was much higher under high flow velocity than under static water and low flow velocity conditions, being 31.6 times higher under the 0.6m/s than under static water condition. Under different flow velocities, the total amount of HBCD release from sediments were always dominated by the HBCD in SS, and the HBCD in surface sediments was more easily distributed to sediments. Obviously, the flow velocity was the key factor driving the release of HBCD from sediments and its redistribution.
王榕, 胡煜, 高寒, 王超, 王沛芳, 陈娟. 不同流速下沉积物中六溴环十二烷的释放及再分配规律[J]. 中国环境科学, 2023, 43(5): 2553-2559.
WANG Rong, HU Yu, GAO Han, WANG Chao, WANG Pei-fang, CHEN Juan. Release and redistribution of hexabromocyclododecane in sediments under different flow velocities. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2553-2559.
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