Sequestration of CO{sub 2} in Mixtures of Caustic Byproduct and Saline Waste Water
- National Energy Technology Laboratory, Pittsburgh, PA (United States)
A series of tests were conducted to investigate a novel reaction concept designed to achieve neutralization of mixtures of acidic oil field produced brine and caustic industrial byproducts while sequestering substantial quantities of anthropogenic carbon dioxide (CO{sub 2}) in a mixed-flow reactor. Experiments were conducted to determine the CO{sub 2}-bearing capacity of reactive mixtures of brine from the Oriskany Sandstone Formation with three caustic industrial byproducts: flue gas desulfurization (FGD) spray dryer ash, Class C fly ash subbituminous coal combustion byproduct, and bauxite residue slurry from the alumina production process. Reactions were conducted in a closed, well-mixed (1,500 rpm) reactor with gas composed of 29.46% vol./vol. CO{sub 2} balanced by nitrogen gas fed at a rate of 300 mL/min. Reactions were carried out at ambient conditions. Results show linear relationships between caustic byproduct addition and CO{sub 2}-bearing capacity, with relatively small impact of brine addition as compared to deionized water addition. FGD spray dryer ash/brine mixtures exhibited higher CO{sub 2} reactivity than those using Class C fly ash (0.759 moles CO{sub 2}, at 23.6% solids by weight and 0.036 moles CO{sub 2} at 23.3% solids by weight, respectively). Bauxite residue exhibited moderate capacities in mixtures with higher percent solids (0.335 moles CO{sub 2} in 40% solids bauxite residue slurry). Carbonation capacity of caustic byproduct/acidic brine mixtures was shown to increase linearly with respect to percent caustic byproduct addition, but enhanced mineral carbonate precipitation resulting from synergistic reaction of brine cations with increased dissolved carbonate species was not observed in the short term.
- OSTI ID:
- 21212859
- Journal Information:
- Environmental Engineering Science, Vol. 26, Issue 8; ISSN 1092-8758
- Country of Publication:
- United States
- Language:
- English
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