TY - JOUR
T1 - Removal of siloxanes in biogases
AU - Schweigkofler, Martin
AU - Niessner, Reinhard
N1 - Funding Information:
This study was supported by the Bayerisches Staatsministerium für Landesentwicklung und Umweltfragen (Project BayFORREST F162).
PY - 2001/5/30
Y1 - 2001/5/30
N2 - Methods for the removal of gaseous silicon compounds in biogases are presented. In laboratory studies, various solid adsorption materials and liquid absorption solutions were evaluated for their siloxane elimination efficiencies. Among the liquid sorbents studied, concentrated nitric acid and sulfuric acid were found to be especially potent siloxane removing agents at elevated temperature. Solid adsorbents tested include activated charcoal, carbopack B, Tenax TA, XAD II resins, molecular sieve 13X and silica gel. Apart from activated charcoal, silica gel showed especially high adsorption capacities of more than 100mg/g for siloxanes. Furthermore, excellent thermal regeneration of the loaded material was possible. The efficiency of silica gel in removing gaseous siloxanes was verified at a sewage treatment plant, where an adsorption bed with silica gel was used for biogas drying. Other gas pretreatment installations studied included refrigeration condensers and adsorbent beds of meadow ore for the catalytic removal of hydrogen sulfide. In contrast to biogas drying by refrigeration, which had a poor effect on siloxane content, the installation of meadow ore adsorption beds resulted in a significant siloxane reduction of 31-75%, depending on the site studied.
AB - Methods for the removal of gaseous silicon compounds in biogases are presented. In laboratory studies, various solid adsorption materials and liquid absorption solutions were evaluated for their siloxane elimination efficiencies. Among the liquid sorbents studied, concentrated nitric acid and sulfuric acid were found to be especially potent siloxane removing agents at elevated temperature. Solid adsorbents tested include activated charcoal, carbopack B, Tenax TA, XAD II resins, molecular sieve 13X and silica gel. Apart from activated charcoal, silica gel showed especially high adsorption capacities of more than 100mg/g for siloxanes. Furthermore, excellent thermal regeneration of the loaded material was possible. The efficiency of silica gel in removing gaseous siloxanes was verified at a sewage treatment plant, where an adsorption bed with silica gel was used for biogas drying. Other gas pretreatment installations studied included refrigeration condensers and adsorbent beds of meadow ore for the catalytic removal of hydrogen sulfide. In contrast to biogas drying by refrigeration, which had a poor effect on siloxane content, the installation of meadow ore adsorption beds resulted in a significant siloxane reduction of 31-75%, depending on the site studied.
KW - Gas pretreatment
KW - Landfill gas
KW - Sewage gas
KW - Silica gel
KW - Siloxanes
UR - http://www.scopus.com/inward/record.url?scp=0035972927&partnerID=8YFLogxK
U2 - 10.1016/S0304-3894(00)00318-6
DO - 10.1016/S0304-3894(00)00318-6
M3 - Article
C2 - 11348731
AN - SCOPUS:0035972927
SN - 0304-3894
VL - 83
SP - 183
EP - 196
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 3
ER -