TY - JOUR
T1 - Evaluation of Modified Activated Carbons for Mercury Reemission Control During Neutralization of a Simulated Wastewater from the Direct Contact Cooler of a Pressurized Oxy-Combustion Process
AU - Dastgheib, Seyed A.
AU - Mock, Justin
AU - Ilangovan, Tina
N1 - Funding Information:
This work was partially supported by the U.S. Department of Energy, National Energy Technology Laboratory (Cooperative Agreement DE-FE0029161). This document does not necessarily reflect agency views. Any mention of trade names or commercial products does not constitute endorsement or recommendation for use. Neither the United States Government nor any agency thereof makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of the authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
PY - 2021/1/20
Y1 - 2021/1/20
N2 - Pressurized oxy-combustion is one of the most efficient emerging combustion systems for coal-based power generation with CO2 capture. Mercury reemission and the fate of mercury, arsenic, and selenium in the liquid phase during neutralization of a simulated wastewater from the direct contact cooler of a pressurized oxy-combustion process are investigated. The performance of selected commercial activated carbons (ACs) or modified ACs impregnated with sulfur or transition metals have been investigated and compared with a commercial additive for mercury reemission control. Sorbent addition, compared with the baseline case (i.e., no sorbent or additive), could increase or decrease mercury reemission during neutralization by a limestone slurry. The addition of selected commercial ACs to the solution was detrimental to mercury reemission control, as indicated by an increase in the cumulative mercury reemission by up to 5 times. In contrast, the addition of ACs impregnated with elemental sulfur, iron, or copper decreased mercury reemission by up to 90%, likely because of the adsorption of mercury by sulfur or metal species dispersed on the AC surface. Adsorption experiments showed that ACs with suitable properties could control mercury reemission and remove mercury and arsenic from a simulated wastewater, with some even outperforming the commercial additive used for mercury reemission control. However, none of the tested ACs or the commercial additive was effective in removing selenium. Overall, a combination of two mechanisms, namely, the adsorption of mercury onto AC adsorption sites and the reduction of the soluble ionic mercury to volatile elemental mercury by the AC, may control mercury reemission in the presence of an AC sorbent.
AB - Pressurized oxy-combustion is one of the most efficient emerging combustion systems for coal-based power generation with CO2 capture. Mercury reemission and the fate of mercury, arsenic, and selenium in the liquid phase during neutralization of a simulated wastewater from the direct contact cooler of a pressurized oxy-combustion process are investigated. The performance of selected commercial activated carbons (ACs) or modified ACs impregnated with sulfur or transition metals have been investigated and compared with a commercial additive for mercury reemission control. Sorbent addition, compared with the baseline case (i.e., no sorbent or additive), could increase or decrease mercury reemission during neutralization by a limestone slurry. The addition of selected commercial ACs to the solution was detrimental to mercury reemission control, as indicated by an increase in the cumulative mercury reemission by up to 5 times. In contrast, the addition of ACs impregnated with elemental sulfur, iron, or copper decreased mercury reemission by up to 90%, likely because of the adsorption of mercury by sulfur or metal species dispersed on the AC surface. Adsorption experiments showed that ACs with suitable properties could control mercury reemission and remove mercury and arsenic from a simulated wastewater, with some even outperforming the commercial additive used for mercury reemission control. However, none of the tested ACs or the commercial additive was effective in removing selenium. Overall, a combination of two mechanisms, namely, the adsorption of mercury onto AC adsorption sites and the reduction of the soluble ionic mercury to volatile elemental mercury by the AC, may control mercury reemission in the presence of an AC sorbent.
KW - ISGS
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U2 - 10.1021/acs.iecr.0c05555
DO - 10.1021/acs.iecr.0c05555
M3 - Article
SN - 0888-5885
VL - 60
SP - 947
EP - 954
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 2
ER -