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Received February 7, 2018
Accepted June 13, 2018
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Behavior of heavy metals in air pollution control devices of 2,400 kg/h municipal solid waste incinerator
1Department of Environmental Engineering, Chungbuk National University, Cheongju 28644, Korea 2Department of Eco-Machinery System, Korea Institute of Machinery & Materials, Daejeon 34103, Korea 3Thermochemical Energy System R&D Group, Korea Institute of Industrial Technology, Cheonan 31056, Korea 4Department of Green Process and System Engineering, University of Science and Technology (UST), Daejeon 34113, Korea 5SGE Energy, Anyang 14056, Korea
slee@chungbuk.ac.kr
Korean Journal of Chemical Engineering, September 2018, 35(9), 1823-1828(6), 10.1007/s11814-018-0101-1
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Abstract
We analyzed the behavior of heavy metals, such as Cd, Cr, Cu, Ni, Pb, Zn, and Hg, in air pollution control devices of a municipal solid waste incinerator. For this study, a municipal solid waste incinerator with a burning capacity of 2,400 kg/h was selected. A semi-dry reactor (SDR), fabric filter, and wet scrubber were installed to serve as air pollution control devices. Flue gas was sampled upstream and downstream of each air pollution control device to determine the heavy metal concentrations therein. Ash was collected from the furnace, boiler, SDR, and fabric filter to determine the heavy metal concentration in the ash produced by each device. Each heavy metal was found to have a different fate in the incinerator and air pollution control devices. Cd and Pb were mostly present in the fabric filter ash, whereas Cr, Cu, and Ni were most prevalent in the bottom ash of the furnace and boiler, and Zn was present in the bottom and fabric filter ash at a ratio of 7 : 3. However, only a few percent of Hg was identified in the ash from the furnace, boiler, SDR, and fabric filter; the majority of Hg passed through the fabric filter and existed in an oxidized form. The wet scrubber exhibited high control efficiency for oxidized mercury, and the injection of commercial activated carbon at a rate of 0.2 g/Sm3 resulted in 93.2% mercury removal efficiency
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References
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