Degradation of chlorinated dioxin in denitrifying activated sludge from leachate treatment plant of a landfill |
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| Authors: | Email author" target="_blank">Kunichika?NakamiyaEmail author Tohru?Furuichi Kazuei?Ishii Ikuo?Souda |
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| Institution: | (1) Project Group of Risk Assessment and Management for Endocrine Disruptor and dioxin-like compounds, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan;(2) Division of Environment Resource Engineering, Hokkaido University, Sapporo, Japan;(3) Environmental Engineering Division, Kanagawa Prefecture Environmental Research Center, Kanagawa, Japan |
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| Abstract: | The degradation rate of dioxins added to the activated sludge from a leachate treatment plant of a landfill under denitrification conditions was estimated using six bioreactors. Over 99% of the added dioxins (600 ng) were degraded within 7 days. Furthermore, continuous cultivation was carried out for 1 month. The activated sludge degraded 600ng of dioxins (that is, all of the added dioxins) placed in each reactor every 7 days, and this activity was maintained for 35 days. Under aerobic conditions with this sludge, the dioxins were not degraded in 7 days, but 90% of the 600ng of dioxins was degraded in 35 days. The high level of activity observed in the present study may only occur under anaerobic conditions, especially under denitrifying conditions. |
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| Keywords: | Denitrifying Leachate Dioxin Activated sludge Treatment |
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