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Title: Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test

Abstract

Highlights: • Equilibrium test was attempted to evaluate adsorption characteristics of siloxane. • L2 had higher removal efficiency in carbon compared to noncarbon adsorbents. • Total adsorption capacity of siloxane was 300 mg/g by coal activated carbon. • Adsorption characteristics rely on size of siloxane molecule and adsorbent pore. • Conversion of siloxane was caused by adsorption of noncarbon adsorbents. - Abstract: Due to the increase in energy cost by constantly high oil prices and the obligation to reduce greenhouse effect gases, landfill gas is frequently used as an alternative energy source for producing heat and electricity. Most of landfill gas utility facilities, however, are experiencing problems controlling siloxanes from landfill gas as their catalytic oxidizers are becoming fouled by silicon dioxide dust. To evaluate adsorption characteristics of siloxanes, an adsorption equilibrium test was conducted and parameters in the Freundlich and Langmuir isotherms were analyzed. Coconut activated carbon (CA1), coal activated carbon (CA2), impregnated activated carbon (CA3), silicagel (NCA1), and activated alumina (NCA2) were used for the adsorption of the mixed siloxane which contained hexamethyldisiloxane (L2), octamethylcyclotetrasiloxane (D4), and decamethylcyclopentasiloxane (D5). L2 had higher removal efficiency in noncarbon adsorbents compared to carbon adsorbents. The application of Langmuir and Freundlich adsorptionmore » isotherm demonstrated that coconut based CA1 and CA3 provided higher adsorption capacity on L2. And CA2 and NCA1 provided higher adsorption capacity on D4 and D5. Based on the experimental results, L2, D4, and D5 were converted by adsorption and desorption in noncarbon adsorbents. Adsorption affinity of siloxane is considered to be affect by the pore size distribution of the adsorbents and by the molecular size of each siloxane.« less

Authors:
;  [1]; ;  [2];  [2]
  1. Department of Environmental Engineering, Konkuk University, Hwayang-Dong, Gwangjin-Gu, Seoul 143-701 (Korea, Republic of)
  2. Department of Environmental Engineering, Anyang University, Anyang 5-Dong, Manan-Gu, Anyang-Si, Gyeonggi-Do 430-714 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22300309
Resource Type:
Journal Article
Journal Name:
Waste Management
Additional Journal Information:
Journal Volume: 33; Journal Issue: 10; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0956-053X
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; ACTIVATED CARBON; ADSORPTION; ADSORPTION ISOTHERMS; ALTERNATIVE FUELS; ALUMINIUM OXIDES; COAL; COCONUTS; DESORPTION; ENERGY ACCOUNTING; GAS UTILITIES; GREENHOUSE EFFECT; LANDFILL GAS; OXIDIZERS; POWER GENERATION; SILICON OXIDES; SILOXANES

Citation Formats

Nam, Sangchul, Namkoong, Wan, Kang, Jeong-Hee, Park, Jin-Kyu, and Lee, Namhoon. Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test. United States: N. p., 2013. Web. doi:10.1016/J.WASMAN.2013.03.024.
Nam, Sangchul, Namkoong, Wan, Kang, Jeong-Hee, Park, Jin-Kyu, & Lee, Namhoon. Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test. United States. doi:10.1016/J.WASMAN.2013.03.024.
Nam, Sangchul, Namkoong, Wan, Kang, Jeong-Hee, Park, Jin-Kyu, and Lee, Namhoon. Tue . "Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test". United States. doi:10.1016/J.WASMAN.2013.03.024.
@article{osti_22300309,
title = {Adsorption characteristics of siloxanes in landfill gas by the adsorption equilibrium test},
author = {Nam, Sangchul and Namkoong, Wan and Kang, Jeong-Hee and Park, Jin-Kyu and Lee, Namhoon},
abstractNote = {Highlights: • Equilibrium test was attempted to evaluate adsorption characteristics of siloxane. • L2 had higher removal efficiency in carbon compared to noncarbon adsorbents. • Total adsorption capacity of siloxane was 300 mg/g by coal activated carbon. • Adsorption characteristics rely on size of siloxane molecule and adsorbent pore. • Conversion of siloxane was caused by adsorption of noncarbon adsorbents. - Abstract: Due to the increase in energy cost by constantly high oil prices and the obligation to reduce greenhouse effect gases, landfill gas is frequently used as an alternative energy source for producing heat and electricity. Most of landfill gas utility facilities, however, are experiencing problems controlling siloxanes from landfill gas as their catalytic oxidizers are becoming fouled by silicon dioxide dust. To evaluate adsorption characteristics of siloxanes, an adsorption equilibrium test was conducted and parameters in the Freundlich and Langmuir isotherms were analyzed. Coconut activated carbon (CA1), coal activated carbon (CA2), impregnated activated carbon (CA3), silicagel (NCA1), and activated alumina (NCA2) were used for the adsorption of the mixed siloxane which contained hexamethyldisiloxane (L2), octamethylcyclotetrasiloxane (D4), and decamethylcyclopentasiloxane (D5). L2 had higher removal efficiency in noncarbon adsorbents compared to carbon adsorbents. The application of Langmuir and Freundlich adsorption isotherm demonstrated that coconut based CA1 and CA3 provided higher adsorption capacity on L2. And CA2 and NCA1 provided higher adsorption capacity on D4 and D5. Based on the experimental results, L2, D4, and D5 were converted by adsorption and desorption in noncarbon adsorbents. Adsorption affinity of siloxane is considered to be affect by the pore size distribution of the adsorbents and by the molecular size of each siloxane.},
doi = {10.1016/J.WASMAN.2013.03.024},
journal = {Waste Management},
issn = {0956-053X},
number = 10,
volume = 33,
place = {United States},
year = {2013},
month = {10}
}