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Concerned about dioxin emissions from rural solid waste

Release time:2017-03-10Author:admin

The researchers said that in rural areas, in order to deal with the increasing amount of household waste, a vertical fixed furnace without power furnace incinerator technology has been widely used, and more in the village outside the farm side. They are the object of this study is located in a place such a burning furnace: garbage once stacked in the hearth, by the ashes slowly evaporated in the garbage of the water, in a certain ignition under the spontaneous combustion to burn, the heat is not comprehensive utilization , Flue gas untreated directly from the 10 m high chimney row to the environment, basically belong to the unorganized emissions. Emissions of pollutants will not only have a certain impact on the nearby crops or the ecological environment, but also through the food chain to the local residents of the health of the threat, but the source of dioxin emissions of such sources are rarely reported.

The results show that the dioxin concentration of dioxin in the soil samples in the surrounding environment of the incinerator is 2, which is based on the analysis of the distribution of dioxins in ash and ash from six environmental soils and incinerators around the incinerator. (0.357 I-TEQ ng / kg), and the international toxicant equivalence of dioxin in fly ash and ash in incinerator was 3 454 and 32. 2 ng / kg. The dioxin toxicity equivalent in the fly ash sample was 107 times that of the ash sample and 744 times the average content of the surrounding soil sample.

The results show that the correlation between dioxin in soil samples and fly ash or ash discharged from incinerators is poor, and the reason is that the correlation between soil samples and incinerator emissions is discussed by principal component analysis. On the one hand, it may be related to the main OCDD in soil samples. On the other hand, dioxin in the soil is not only emitted from the MSW incinerator, but also from other sources such as atmospheric migration, open field burning and forest fires May be the source of dioxin in the soil. It can be seen that the source of dioxin in the environment is more complex and the pollutant discharge from the incinerator is not the only source of dioxin in the soil.

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