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| Effect of magnetic activated carbon on the recovery of polybrominated diphenyl ethers in aquaculture sediments |
| Received:October 25, 2019 |
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| KeyWord:magnetic activated carbon;polybrominated diphenyl ether;bioaccumulation;aquaculture sediment |
| Author Name | Affiliation | E-mail | | ZHANG Li | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | XUAN Li | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | LI Xiao-ning | East Shanghai High School, Shanghai 201306, China | | | YU Wen-jian | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | LI Juan-ying | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | WANG Qian | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | YIN Jie | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | jieyin@shou.edu.cn |
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| Abstract: |
| In order to control the migration of organic pollutants in aquaculture sediment and reduce their bioavailability, and to ensure the quality and safety of aquatic products, particular activated carbon(PAC)and magnetic particular activated carbon(MPAC)were used to control PBDEs in sediments of aquaculture farm ponds. The in-situ remediation effects of PAC and MPAC were assessed by measuring the bioavailability of PBDEs in the sediments and the corresponding bioaccumulation concentrations. R. philippinarum was selected as the test organism. The results showed that although the specific surface area and pore structure of MPAC were slightly lower than those of PAC, before and after magnetization, the overall difference was not very large, the average aperture of MPAC increased significantly, and both kinds of activated carbon can easily adsorb PBDEs. Compared with PAC, MPAC has a slower adsorption rate for PBDEs, but a slightly higher adsorption capacity due to the magnetization. Risk assessment suggested that the studied aquaculture products posed a low dietary risk, whereas the PBDEs in sediments did pose a potential ecological risk, with PBDEs and pentaBDEs posing the greatest risk of the monomers. Aquatic products have shown obvious bio-enrichment in the target compound in bottom mud. The repair effect shows that both PAC and MPAC can repair PBDE pollution in the aquaculture environment, especially that of PBDE and pentaBDE, with an optimal investment ratio of 3% and 1.5%, respectively. However, in the actual site repair process, the characteristics of MPAC(low cost and magnetically recyclable)make it a more suitable repair material for PBDE-contaminated bottom mud in aquaculture ponds. Overall, this study demonstrated that MPAC is a better remediation material than PAC due to its advantages in controlling the migration of organic pollutants, reducing the bioavailability of PBDEs, and ensuring the food safety of cultured products. |
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