Separation of CO2 in a Solid Waste Management Incineration Facility Using Activated Carbon Derived from Pine Sawdust

Abstract

Abstract:The selective separation of CO 2 from gas mixtures representative of flue gas generated in waste incineration systems is studied on two activated carbons obtained from pine sawdust and compared to a commercial activated carbon. Dynamic adsorption experiments were conducted in a fixed-bed adsorption column using a binary mixture (N 2 /CO 2 ) with a composition representative of incineration streams at temperatures from 30 to 70 • C. The adsorption behavior of humid mixtures (N 2 /CO 2 /H 2 O) was also evaluated in order to assess the influence of water vapor in CO 2 adsorption at different relative humidity in the feed gas: 22% and 60%. Moreover, CO 2 adsorption was studied in less favorable conditions, i.e., departing from a bed initially saturated with H 2 O. In addition, the effect of CO 2 on H 2 O adsorption was examined. Experimental results showed that the CO 2 adsorption capacity can be reduced significantly by the adsorption of H 2 O (up to 60% at high relative humidity conditions). On the other hand, the breakthrough tests over the adsorbent initially saturated with water vapor indicated that H 2 O is little affected by CO 2 adsorption. The experimental results pointed out the biomass based carbons as best candidates for CO 2 separation under incineration flue gas conditions.

Microporous Activation Carbon Made of Sawdust From Two Forestry Species for Adsorption of Methylene Blue and Heavy Metals in Aqueous System – Case of Real Polluted Water

“…Both samples exhibit S BET as high as 1278 and 1404 m 2 /g for CSs and CCs, respectively. These levels of S BET are comparable for wood sawdust based activated carbons obtained in others works: up to 914 m 2 /g for sapelli wood sawdust AC (Thue et al, 2017), 1131 m 2 /g for AC made of Leucaena leucocephala waste sawdust (Malwade et al, 2016), up to 788 m 2 /g for pine sawdust AC (Durán et al, 2017), up to 1093 m 2 /g for pine sawdust AC (Gao et al, 2017), between 782 and 2435 m 2 /g in the case of paulownia sawdust AC, among others.…”

Enhanced capacity to CO2 sorption in humid conditions with a K-doped biocarbon

“…Single CO 2 sorption (breakthrough) and cyclic CO 2 sorptiondesorption experiments of the studied solid sorbents were performed in a purpose-built fixed-bed unit thoroughly described elsewhere [18][19][20][21][22][23] .…”

“…Each experimental run involved the following steps: preconditioning, sorption and regeneration. A detailed description is presented elsewhere [23] .…”

“…To study the influence of water vapor in CO 2 sorption and evaluate the stability of the performances, RN2 and RN2K were subjected to other eight consecutive sorption-desorption cycles. The experimental runs included the same steps as in the dry cases but during the adsorption step a ternary mixture consisting of 14% CO 2 /84% N 2 /2% H 2 O was fed to the bed [23] .…”

“…This implies that H 2 O is not fully removed from the bed at the beginning of each intermediate cycle. Thus, for comparative purposes among the different experiments, the capture capacity was evaluated hereafter as an average of the sorption performance over the last five cycles (cycles 4-8) in which concentrations of both CO 2 and H 2 O can be considered stable [23] . Results are shown in Table 7 for samples RN2 and RN2K.…”