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| Emission characteristics and the environmental influence of pollutants in flue gas from small waste incinerators |
| Received:August 28, 2017 |
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| KeyWord:rural waste;small waste incinerator;flue gas pollutant;dioxin;heavy metal |
| Author Name | Affiliation | E-mail | | YAN Xiao | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | | | JIA Yan | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | | | WANG Mei-huan | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | | | XU Rong-fa | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | | | ZHENG Jing | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | | | REN Ming-zhong | State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China | renmingzhong@scies.org |
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| Abstract: |
| Seven incinerators, with a daily processing capacity of 5~12 tons, were selected to study the pollutants in flue gas emitted from typical small waste incinerators in rural areas. Dioxins and heavy metals in the flue gas, as well as heavy metals in the washing wastewater, were analyzed. The effects of the incineration processes and gas treatments on the contaminants in flue gas were also investigated. The levels of dioxins and heavy metals in flue gas samples differed significantly in the seven incinerators. The toxic equivalent concentrations range for dioxin was 0.038~24.87 ng TEQ·m-3. The concentration ranges for Pb and Hg were 0.013~0.576 mg·m-3 and 0.314~579 μg·m-3, respectively. However, the Cd concentrations in four samples and all the Cr concentrations were lower than the detection limit. Compared with the pollution control standard for the municipal solid waste incineration(GB 18485-2014), only one flue gas sample had a toxic equivalent concentration of dioxins under the standard limit, while the Cr and Pb concentrations in all seven samples, Cd in six samples, and Hg in four samples were under the standard limit. In the four washing wastewater samples, only Hg was detected, with a concentration range of 0.54~0.79 μg·m-3. A comparison of the different incineration processes showed that thermal decomposition produced lower dioxins concentrations in the flue gas than simple incineration. Alkali washing was more effective at Hg removal than other gas treatments. Active carbon combined with a bag-type dust collector had favorable effects on dioxins and heavy metal removal. |
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