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| PAHs and heavy-metal polluted aquaculture sediment remediation using different-aged Enteromorpha biochar |
| Received:June 09, 2020 |
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| KeyWord:biochar;aging;aquaculture sediment;PAHs;heavy metals |
| Author Name | Affiliation | E-mail | | ZHAO Han-yin | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | ZHANG Li | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | YU Wen-jian | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | CHEN Yi-qin | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China | | | YU Yan-lu | 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 | jyli@shou.edu.cn |
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| Abstract: |
| To control the migration of heavy metals and polycyclic aromatic hydrocarbons(PAHs)in the aquaculture sediment reduce their bioaccumulation, and ensure the quality and safety of aquatic products, this study investigated the effects of different aging methods on the immobilization of combined pollution in sediments based on the effects of pyrolysis on the content of PAHs in Enteromorpha biochar. The pyrolysis of the produced Enteromorpha biochar was followed by spontaneous aging and freeze-thaw cycle aging. A total of 3% of the biochar was added to the contaminated aquaculture sediment. The remediation effect of biochar was evaluated using clams(R. philippinarum)as biological indicators. The results showed that after pyrolysis, the content of PAHs in Enteromorpha biochar decreased by 86%, which reached the European Biochar Certificate standard. After adding 3%-aged biochar, the bioaccumulation concentration of heavy metals and PAHs decreased and the immobilization effect of spontaneous aging was significantly better than that of freeze-thaw cycle aging. The concentrations of heavy metals(Cu, Pb, Cd, and Cr)and PAHs in the R.philippinarum decreased by 30%, 41%, 53%, 43%, and 28%, respectively. The non-carcinogenic and carcinogenic risks of R.philippinarum decreased by 42% and 35%, respectively. Therefore, the addition of Enteromorpha biochar after spontaneous aging not only had an acceptable stabilizing effect on the composite pollutants in the sediment but also improved the quality of aquatic products, thus protecting the health of consumers. |
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