Removal of Volatile Organic Compounds from Contaminated Surfactant Solution using Co-Curren Vacuum Stripping

Authors: Pornchai Suriya-Amrit, Suratsawadee Kungsanant, Boonyarach Kitiyanan

Abstract:

There has been a growing interest in utilizing surfactants in remediation processes to separate the hydrophobic volatile organic compounds (HVOCs) from aqueous solution. One attractive process is cloud point extraction (CPE), which utilizes nonionic surfactants as a separating agent. Since the surfactant cost is a key determination of the economic viability of the process, it is important that the surfactants are recycled and reused. This work aims to study the performance of the co-current vacuum stripping using a packed column for HVOCs removal from contaminated surfactant solution. Six types HVOCs are selected as contaminants. The studied surfactant is the branched secondary alcohol ethoxylates (AEs), Tergitol TMN-6 (C14H30O2). The volatility and the solubility of HVOCs in surfactant system are determined in terms of an apparent Henry’s law constant and a solubilization constant, respectively. Moreover, the HVOCs removal efficiency of vacuum stripping column is assessed in terms of percentage of HVOCs removal and the overall liquid phase volumetric mass transfer coefficient. The apparent Henry’s law constant of benzenz , toluene, and ethyl benzene were 7.00×10-5, 5.38×10-5, 3.35× 10-5 respectively. The solubilization constant of benzene, toluene, and ethyl benzene were 1.71, 2.68, 7.54 respectively. The HVOCs removal for all solute were around 90 percent.

Keywords: Apparent Henry’s law constant, Branched secondary alcohol ethoxylates, Vacuum Stripping.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1073513

References:

[1] P. Trakultamupatam, J. F. Scamehorn, and S. Osuwan. (2002) "Removal of volatile aromatic contaminants from waste water by cloud point extraction,". Separation Science and Technology, 37(6), 1291-1305.
[2] P. Taechangam, J. F. Scamehorn, S. Osuwan, and T. Rirksomboon. "Effect of nonionic surfactant molecular structure on cloud point extraction of phenol from waste water", Separation and Purification Technology,
[3] S. Sakulwongyai, P. Trakultamupatam, J. F. Scamehorn, S. Osuwan, and S. D. Christian (2000). "Use of a surfactant coacervate phase to extract chlorinated aliphatic compounds form water: Extraction of chlorinated ethanes and quantitative comparison to solubilization in micelles," Langmuir, 16(22), 8226-8230.
[4] W. Kimchuwanit, S. Osuwan, J. F. Scamehorn, J. H. Harwell, and K. J. Haller (2010) "Use of acoacervate phase to extract trichloroethylene from water", Separation Science and Technology, 35(3), 1991-2002.
[5] S. Kutzer, H. Wintrich, and A. Mersmann (1995) "Air stripping - a method for treatment of wastewater," Chemical Engineering and Technology, 18(3), 149-155.
[6] R. L. Gross, and S.G. TerMaath, (1985) "Packed tower aeration strips trichloroethylene from groundwater," Environmental Progress, 4(2), 119-124.
[7] V. Linek, J. Sinkule, and V. Janda (1998) "Design of packed aeration towers to strip volatile organic compounds from water," Water Researches, 32(4), 1264-1270.
[8] O D Castillo, J. R. Guerrero-Medina, G. Lopez-Toledo, J. Rocha (2000) "Mathematical Evaluation of Activated Carbon Adsorption for Surfactant Recovery in a Soil Washing Process", Ind. Eng. Chem. Res., 39(3), 731.
[9] Y. Hwang, G. E. Keller, J. D. Olson (1992a) "Steam stripping for removal of organic pollutants form water1. Stripping effectiveness and stripping design," Industrial and Engineering Chemistry Research, 31(7), 1753-1759.
[10] Y. Hwang, G. E. Keller, J. D. Olson (1992a) "Steam stripping for removal of organic pollutants form water2. Vapor liquid equilibrium data", Industrial and Engineering Chemistry Research, 31(7), 1760-1768.
[11] W. C. Lin, P. A. Rice, Y. S. Cheng, and A. J. Barduhn (1977) "Vacuum stripping of refrigerants in water sprays," AlChE Journal, 23(4), 409-415.
[12] M. N. Tackie, and P. A. Rice (1991). "Vacuum stripping of trichlorofluoromethane emulsions from Water sprays", Separation Technology, 1, 205-213.
[13] J. E. Bajolle, and P. A. Rice (1971). "Vacuum stripping of Butane from water in packed column," Chemical Engineering and Technology, 9(4), 351-366.
[14] E. A. Rasquin, S. Lynn, and D. N. Hanson (1977). "Vacuum degassing of dioxide and oxygen from water in packed column," Industrial and Engineering Chemistry Fundamentals, 16(1), 103-108.
[15] A. LLydersen (1991). "Co-current vacuum de-aeration of water for injection into oil reservoirs," Chemical Engineering Technology, 14(4), 248-252.
[16] R. E. Treybal (1981). Mass Transfer Operation. 3rd ed. Auckland: McGraw-Hill.
[17] S. Kungsanant, B. Kitiyanan, T. Rirksomboon, S. Osuwan, and J. F. Schamehorn (2008). "Toluene removal form nonionic surfactant coacervate phase solutions by vacuum stripping," Separation and Purification Technology, 63(2), 370-378.
[18] S. Kungsanant, B. Kitiyanan, T. Rirksomboon, S. Osuwan, and J. F. Schamehorn (2009). "Volatile organic compound removal from nonionic surfactant coacervate phase solutions by co-current vacuum stripping: Effect of surfactant concentration, temperature, and solute type," Separation and Purification Technology, 66, 510-516.
[19] U. N. Choori, J. F. Schamehorn, J. F. O'Haver, and J. H. Harwell (1998). "Removal of volatile organic compound removal from surfactant solutions by flash vacuum stripping in a packed column," Ground Water Monitoring and Remediation, 18(4), 157-165.
[20] Mackay, D. (2006). Handbook of physical-chemical properties and environmental fate of organic chemicals, 2nd Edition; CRC/Taylor & Francis: Florida.