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Utilization of Multiple Waste Streams for Acid Gas Sequestration and Multi‐Pollutant Control
Author(s) -
Soong Y.,
Dilmore R. M.,
Hedges S. W.,
Howard B. H.,
Romanov V.
Publication year - 2012
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201100341
Subject(s) - bauxite , chemistry , carbonation , brine , flue gas , wastewater , pulp and paper industry , residue (chemistry) , waste management , effluent , environmental science , environmental engineering , organic chemistry , engineering
A novel CO 2 sequestration concept is reported that combines SO 2 removal and CO 2 capture and sequestration, using a bauxite‐processing residue which is a waste product and with waste brine water from oil/gas production. The bauxite residue/brine mixture of 46/54 v/v exhibited a CO 2 sequestration capacity of > 0.078 mol L –1 when exposed to pure CO 2 at 20 °C and 2.73 MPa. At a higher temperature of 140 °C, a bauxite residue/brine mixture of 80/20 v/v indicated a CO 2 sequestration capacity of > 0.094 mol L –1 when exposed to pure CO 2 at 3.85 MPa. Under the same reaction conditions, an identical ratio of reaction mixture exposed to simulated flue gas at a similar initial pressure was capable of sequestering 0.16 mol of CO 2 and > 99.9 % of the applied SO 2 . Calcite formation was verified as a product of bauxite/brine mixture carbonation. The caustic bauxite residues (pH 12.5–13.5) and acidic wastewater brine (pH 3–5) are also effectively neutralized after participating as reactive reagents in the conceptual process.