Browse > Article
http://dx.doi.org/10.15231/jksc.2013.18.3.038

Neutralization of Synthetic Alkaline Wastewater with CO2 in a Semi-batch Jet Loop Reactor  

Son, Min-Ki (부경대학교 환경공학과)
Sung, Ho-Jin (고등기술연구원)
Lee, Jea-Keun (부경대학교 환경공학과)
Publication Information
Journal of the Korean Society of Combustion / v.18, no.3, 2013 , pp. 38-43 More about this Journal
Abstract
In this study, we tested the absorption of $CO_2$ in combustion gas into an alkaline wastewater to simultaneously control $CO_2$ and wastewater. During the experiment, we investigated the effects of operating parameters on neutralization characteristics of the wastewater by using $CO_2$ in a bench-scale semi-batch jet loop reactor (0.1 m diameter and 1.0 m in height). The operating parameters investigated in the study are gas flow rate of 1.0-2.0 L/min, liquid recirculation flow rate of 4-32 L/min, and liquid temperature of $20-25^{\circ}C$. It was shown that the initial pH of wastewater rapidly decreased with increased gas flow rate for a given liquid recirculation flow rate. This was due to the increase in the gas holdup and the interfacial area at higher gas flow rate in the reactor. At constant gas flow rate, the time required to neutralize the wastewater initial pH of 10.1 decreased with liquid recirculation flow rate ($Q_L$), reached a minimum value in the range of $Q_L$ = 16-24 L/min, and then increased with further increase in $Q_L$. Further, the time required to neutralize the wastewater was shortened at higher temperatures.
Keywords
$CO_2$; Absorption; Alkaline wastewater; Neutralization; Jet loop reactor;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Go, K. S., "A study on utilization of $CO_2$-rich exhaust gas for pH control of alkaline wastewater", D. Dissertation, Sunchun University, 2010.
2 Lin, C. C. and Chen B. C., "Carbon dioxide absorption into NaOH solution in a cross-flow rotating packed bed", J. Ind. Eng. Chem., 13(7), 2007, pp. 1083-1090.
3 Fleischer, C., Becker, S. and Eigenberger, G., "Detailed modeling of the chemisorption of $CO_2$ into NaOH in a bubble column", Chemical Engineering Science, 51(10), 1996, pp. 1715-1724.   DOI   ScienceOn
4 Park, S. W., Ryu, J. H., Lee, S. S., Hwang, K. S. and Kumazawa, H., "Gas absorption of $CO_2$ into emulsion with alkaline aqueous solutions", J. of the Korean institute of chemical engineers, 35(4), 1997, pp. 476-484.
5 Gaddis, E. S., "Mass transfer in gas-liquid contactors", Chemical Engineering and Processing, 38, 1990, pp. 503-510.
6 Chriastel, L. and Fadavi, A., "New concept of jet loop bioreactor", Nova Biotechnoligica, 4(1), 2006, pp. 89-100.
7 Maurizio, P., Ana, E. and Federico, F., "Aerobic treatment of winery wastewater using a jet loop activated sludge reactor", Process Biochemistry, 37(8), 2002, pp. 821-829.   DOI   ScienceOn
8 Kang, S. H., "The effects of influent loading rate in piggery wastewater treatment by Jet Loop Reactor", Environmental re, 21(5-B), 2001, pp. 567- 573.
9 Park, J. T., Lee, G. H., Lyu, W. R. and Jo, M. H., "Biological treatment of dyeing wastewater using Jet Loop Reactor with activated carbon supports", KSBB Journal, 17(3), 2002, pp. 241- 246.
10 Yildiz, E., Keskinler, B., Pekdemir, T., Akay, G. and Nuhoglu, A., "High strength wastewater treatment in a jet loop membrane bioreactor: kinetics and performance evaluation", Chemical Engineering Science, 60, 2005, pp. 1106-1116.
11 Velan, M., Ramanujam, T. K., "Mixing time in a down-flow jet loop bioreactor", Bioprocess Engineering, 12, 1995, pp. 81-86.   DOI   ScienceOn
12 Prasad, K. Y., Ramanujam, T. K., "Overall volumetric mass transfer coefficient in a modified reversed flow jet loop bioreactor with low density particles", Bioprocess Engineering, 12, 1995, pp. 209-214.
13 Peng, Y., Zhao, B., Li, L., "Advance in postcombustion $CO_2$ capture with alkaline solution: a brief review", Energy Procedia, 14, 2012, pp. 1515- 1522.   DOI   ScienceOn
14 Pohorecki, R. and Moniuk, W., "Kinetics of reaction between carbon dioxide and hydroxyl ions in aqueous electrolyte solutions", Chemical Engineering Science, 43(7), 1998, pp. 1677-1684.