Development and deployment of integrated air pollution control, CO2 capture and product utilization via a high-gravity process: comprehensive performance evaluation

• Published in: Environmental pollution (1987) Vol. 252; pp. 1464 - 1475
• Main Authors: Chen, Tse-Lun, Fang, Yun-Ke, Pei, Si-Lu, Pan, Shu-Yuan, Chen, Yi-Hung, Chiang, Pen-Chi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2019
• Subjects: 3E triangle model; Accelerated carbonation; Air pollution control; Compressive strength; Rotating packed bed; Supplementary cementitious material; Supplementary cementitious material; Air pollution control; Rotating packed bed; Compressive strength; 3E triangle model; Accelerated carbonation
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2019.06.047

In this study, a proposed integrated high-gravity technology for air pollution control, CO2 capture, and alkaline waste utilization was comprehensively evaluated from engineering, environmental, and economic perspectives. After high-gravity technology and coal fly ash (CFA) leaching processes were integrated, flue gas air emissions removal (e.g., sulfate dioxide (SO2), nitrogen oxides (NOx), total suspended particulates (TSP)) and CO2 capture were studied. The CFA, which contains calcium oxide and thus, had high alkalinity, was used as an absorbent in removing air pollution residues. To elucidate the availability of technology for pilot-scale high-gravity processes, the engineering performance, environmental impact, and economic cost were simultaneously investigated. The results indicated that the maximal CO2, SO2, NOx, and TSP removal efficiencies of 96.3 ± 2.1%, 99.4 ± 0.3%, 95.9 ± 2.1%, and 83.4 ± 2.6% were respectively achieved. Moreover, a 112 kWh/t-CO2 energy consumption for a high-gravity process was evaluated, with capture capacities of 510 kg CO2 and 0.468 kg NOx per day. In addition, the fresh, water-treated, acid-treated, and carbonated CFA was utilized as supplementary cementitious materials in the blended cement mortar. The workability, durability, and compressive strength of 5% carbonated CFA blended into cement mortar showed superior performance, i.e., 53 MPa ±2.5 MPa at 56 days. Furthermore, a higher engineering performance with a lower environmental impact and lower economic cost could potentially be evaluated to determine the best available operating condition of the high-gravity process for air pollution reduction, CO2 capture, and waste utilization. [Display omitted] •Chemical properties and calcium leaching kinetic of coal fly ash were described.•Simultaneous air emission reduction from exhausted gas in a RPB was achieved.•Efficacy of wastes utilization as SCM in cement mortar was evaluated.•Best available operating conditions were identified by 3E triangle model.