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Behavior of heavy metals in air pollution control devices of 2,400 kg/h municipal solid waste incinerator

Authors
  • Ahmad, Tanveer
  • Park, Jeongmin
  • Keel, Sangin
  • Yun, Jinhan
  • Lee, Uendo
  • Kim, Youngwoon
  • Lee, Sang-Sup
Type
Published Article
Journal
Korean Journal of Chemical Engineering
Publisher
Springer-Verlag
Publication Date
Aug 20, 2018
Volume
35
Issue
9
Pages
1823–1828
Identifiers
DOI: 10.1007/s11814-018-0101-1
Source
Springer Nature
Keywords
License
Yellow

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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