Adsorption characteristics of carbonaceous adsorbents for organic compounds and mercury in a model exhaust gas from thermal treatment process

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Abstract

This study investigated the adsorption characteristics of carbonaceous adsorbents for organic compounds and mercury in gas, in order to gain technical knowledge useful for the appropriate operation and management of incineration plants and industrial heat treatment facilities. The experiments were performed using a dynamic method, employing a small column packed with test adsorbent, into which flowed the model gas, primarily over a temperature range from 150ºC to 190ºC. Three activated carbon materials and an activated coke were used, with specific surface areas ranging from 250 to 1,100 m2/g-adsorbent. Organic components in the gas were produced and supplied at a concentration of tens of mg/m3, and gaseous mercury was supplied at a concentration of around 100 μg/m3. The experimental results included the following: 1) The adsorption capacity of every carbonaceous material for organic vapor decreased with increasing temperature, with roughly a three-fold difference in the capacity, between 150ºC and 190ºC in dry gas. The equilibrium adsorption amount of benzene could be estimated based on the specific surface area of the adsorbent. 2) Gas moisture reduced the equilibrium adsorption amount of adsorbate by about half. 3) In the case of mercury adsorption in gas, the effect of temperature was relatively large in the activated carbons, with the amount at 150ºC being six-times larger than at 190ºC. However, there was no temperature-dependent difference in the adsorption ability of the activated coke adsorbent. In addition, estimation of treatment performance for actual adsorption processing suggested the possibility of decreased removal efficiency at higher temperatures over 175-180ºC. The precise process design should be made based on future practical studies.

Original languageEnglish
JournalProceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA
Volume2020-June
Publication statusPublished - 2020
EventAir and Waste Management Association''s 113th Annual Conference and Exhibition: Gateway to Innovation, ACE 2020 - San Francisco, Virtual, United States
Duration: Jun 29 2020Jul 2 2020

Keywords

  • Adsorption
  • Carbonaceous materials
  • Flue gas treatment
  • Mercury
  • Thermal processes
  • VOCs

ASJC Scopus subject areas

  • Environmental Science(all)
  • Energy(all)

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