Application of a packed column air stripper in the removal of volatile organic compounds from wastewater

Mohammed Evuti Abdullahi 1 , Mohd Ariffin Abu Hassan 2 , Zainura Zainon Noor 2  and Raja Kamarulzaman Raja Ibrahim 3
  • 1 Faculty of Chemical Engineering, Department of Chemical Engineering, Universiti Teknologi Malaysia-Johor Bahru, Johor Bahru, Johor 81310, Malaysia
  • 2 Institute of Environmental and Water Resources Management, Universiti Teknologi Malaysia-Johor Bahru, Johor Bahru, Johor 81310, Malaysia
  • 3 Advanced Photonic Science Institute, Faculty of Science, Physics Department, Universiti Teknologi Malaysia-Johor Bahru, Johor Bahru, Johor 81310, Malaysia
Mohammed Evuti Abdullahi
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  • Mohammed Evuti Abdullahi obtained his first degree in Chemical Engineering from the Ahmadu Bello University, Zaria-Nigeria, in 1994 and his Master’s degree in Chemical Engineering from the Federal University of Technology, Minna-Nigeria, in 2005. After 9 years of experience as a lecturer in the polytechnic sector, he moved to the University of Abuja-Nigeria in 2008. He is presently a PhD research fellow in the Faculty of Chemical Engineering, Universiti Teknologi Malaysia (UTM). His research interest is in the area of wastewater treatment and environmental pollution control. He is a registered engineer and has many academic publications to his credit.
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, Mohd Ariffin Abu Hassan
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  • Mohd Ariffin Abu Hassan is an Associate Professor in the Faculty of Chemical Engineering in UTM. He obtained his first degree in Chemical Engineering from UTM and was awarded the ESSO medal. He performed his Master’s degree in Engineering Management at UTM in 1998 and obtained his PhD from UMIST, Environmental Technology Centre, Chemical Engineering Department in 2004. His research interest is in the area of wastewater treatment.
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, Zainura Zainon Noor
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  • Zainura Zainon Noor started her career at UTM in 1999 as a research officer in the Chemical Engineering Pilot Plant. A well-trained chemical engineer specializing in environmental engineering, Dr. Zainura has established and strengthened her expertise in Green Technology, which includes cleaner production, life cycle assessment (LCA), water and carbon footprints, and greenhouse gas inventory and projection as well as sustainable development. She is an accomplished project manager and is currently leading the Green Technology Research Group (Green Tech RG) at one of UTM’s prominent centers of excellence, the Institute of Water and Environmental Management (IPASA). She is now an Associate Professor in the Faculty of Chemical Engineering, UTM.
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and Raja Kamarulzaman Raja Ibrahim
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  • Raja Kamarulzaman Raja Ibrahim is currently a senior lecturer in the Faculty of Science and an associate researcher at the Advanced Photonic Science Institute in UTM. He obtained his first degree in Physics from UTM in 2002 and his Master’s degree in Optoelectronics from the University of Southampton, UK, in 2005. He obtained his PhD in Chemical Engineering and Analytical Science from the University of Manchester, UK, in 2012 for his work on mid-infrared diagnostics of the gas phase in nonthermal plasma applications. His research interests include the development of optical sensor systems for various applications and the development of nonthermal plasma reactors for environmental pollution applications and gas-phase analysis using optical techniques.
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Addressing environmental degradation and ensuring environmental sustainability are inextricably linked to all methods of reducing volatile organic compounds (VOCs) from the environment. A packed column air stripper is a typical example of such technologies for the removal of VOCs from polluted water. The present review is devoted to the applications of a packed column air stripper and, in comparison with previous reviews, presents further elaborations and new information on topics such as modeling and simulation of the dynamic behavior of the air stripping process in a packed column air stripper. The paper observed that a knowledge gap still exists in the synthesis of this knowledge to formulate practically applicable mathematical relationships to describe the process generally. Therefore, further researches are still required in the area of air stripper performance optimization, particularly in the development of a mathematical model and the optimization of an air stripper using a statistical experimental design method. Such a determination is critical to the understanding of the interactive effect of process variables such as temperature, air-to-water (A/W) ratio, and height of packing on air stripper performance.

  • Abdullahi MP, Chian SS. Chlorinated and non-chlorinated-volatile organic compounds (VOCs) in drinking water of peninsular Malaysia. Sains Malaysiana 2011; 40: 1255–1261.

  • Abdullahi ME, Abu Hassan MA, Zainura ZN, Raja Ibrahim RK. Volatile organic compounds abatement from industrial wastewater: selecting the appropriate technology. Aust J Basic Appl Sci 2013a; 7: 103–113.

  • Abdullahi ME, Abu Hassan MA, Zainura ZN, Raja Ibrahim RK. Simulation of the effect of process variables on packed column air stripper performance. World Appl Sci J 2013b; 25: 1100–1106.

  • Abdullahi ME, Abu Hassan MA, Zainura ZN, Raja Ibrahim RK. Temperature and air-water ratio influence on the air stripping of benzene, toluene and xylene. Desal Water Treat 2014. doi: 10.1080/19443994.2014.903209.

  • AEA Group. Climate change consequences of VOC emission controls. A report to the Department for Environment, Food and Rural Affairs, Welsh Assembly Government, the Scottish Executive and the Department of the Environment for Northern Ireland, 2007.

  • Aeration System Analysis Program (ASAP™). A publication of Sustainable Futures Institute, Michigan Technological University. Available from: Accessed October 18, 2013.

  • Alam R, Hossain MD. Effect of packing materials and other parameters on the air stripping process for the removal of ammonia from the wastewater of natural gas fertilizer factory. J Water Resources Protect 2009; 3: 210–215.

  • Ali I. Catalytic method utilizing an alkaline and acidic liquid catalyst for the removal of siloxane from biogas (landfill methane gas). An unpublished Master’s thesis submitted to the Department of Chemical and Biological Engineering Chalmers University of Technology, Goteborg, Sweden, 2012: 1–20.

  • Anders S, Teich TH, Heinzle E, Hungerbhler K. VOC treatment with non-thermal plasma. Lecture given at the 4th International Conference on Advanced Oxidation Technologies for Water and Air Remediation AOTs-4, Orlando, FL, 1997: 60.

  • Bansode RR, Losso JN, Marshall WE, Rao RM, Portier RJ. Adsorption of volatile organic compounds by pecan shell-and almond shell-based granular activated carbons. Bioresource Technol 2003; 90: 175–184.

  • Bass DH, Sylvia TE. Heated air stripping for the removal of MTBE from recovered ground water. Groundwater Technol 1992: 17–26.

  • Bedding ND, McIntyre AE, Perry R, Lester JN. Organic contaminants in aquatic environment I. Source and occurrence. Sci Total Environ 1982; 25: 143–147.

  • Beranek D. Engineering and design air stripping: Design Guide No. 1110-13. Washington, D.C. Department of Army, U.S. Army Corps of Engineers, 2001: A1-1 to D18.

  • Berenjian A, Chan N, Malmiri HJ. Volatile organic compounds removal methods: a review. Am J Biochem Biotechnol 2012; 8: 220–229.

  • Bravo JL. Design steam stripper for wastewater. Chem Eng Progress 1994: 56–63.

  • Brown A, Devinny JS, Davis MK, Browne TE, Rodriguez RA. A review of potential technologies for the treatment of methyl tertiary butyl ether (MtBE) in drinking water. 1997 NGWA/API Conference on Petroleum Hydrocarbon and Organic Chemical in Ground Water: Prevention Detection and Remediation, USA, 1997: 126–147.

  • Butillo JV, Pulido AD, Reese NM, Lowe MA. Removal efficiency of MTBE in water: confirmation of a predictive model through applied technology. Proceedings of the API/NGWA Petroleum Hydrocarbons and Organic Chemicals in Groundwater: Prevention, Detection and Remediation, Houston, TX, November 2–4, 1994: 91–105.

  • Byer WD, Morton CM. Removing VOCs from groundwater; pilot, scale-up, and operating experience. Environ Progress 1985; 4: 112–118.

  • Cameron GM, Chang I. Sizing of packed towers in acid plants. Presented at The Chemical Engineers’ Resource Page 2010: 1–21.

  • Cho LD, Chung CD, Kim G. Decomposition and solidification of hazardous volatile organic compounds through plasma chemical reactions. J Ind Eng Chem 2007; 13: 287–297.

  • Chuang KT, Cheng S, Tong S. Removal and destruction of benzene, toluene and xylene from wastewater by air stripping and catalytic oxidation. Ind Eng Chem Res 1992; 31: 2466–2472.

  • Creyghton B. Direct plasma treatment of polluted water. 4th Int. Conf. on Advanced Oxidation Technologies for Water and Air Remediation AOTs-4, Orlando, FL, 1997: 58.

  • Derwent RG. Sources, distributions and fates of VOCs in the atmosphere. In: Hester RE, Harrison RM, Derwent RG, editors. Volatile organic compounds in the atmospheres. UK: The Royal Society of Chemistry, 1995: 1–15.

  • Djebbar Y, Narbaitz RM. Neural network prediction of air stripping KL a. J Environ Eng 2002; 128: 451–460.

  • Dwivedi P, Gaur V, Sharma A, Verma N. Comparative study of removal of volatile organic compounds by cryogenic condensation and adsorption by activated carbon fiber. Separ Purif Technol 2004; 39: 23–27.

  • Dzombak DA, Fang H, Roy SB. ASDC: a micro-computer based program for Air Stripper Design and Costing. CE Report No. 92-204 [USAF Report No. ESL-TR-91-40] 1991: 1–167.

  • El-Behlil MA, Adma SA. Volatile organic chemicals removal from contaminated water using low profile sieve tray air stripping towers. Int Water Technol J 2012; 2: 164–176.

  • El-Behlil MA, El-Gezawi SM, Adma SA. Simplified packed tower calculation for the removal of VOCs from contaminated water. Sixteenth International Water Technology Conference, IWTC, Istanbul, Turkey, 2012: 1–18.

  • Elias A, Ibarra G, Ormazabal J, Murgia I, Zugazti P. ADM: a model for water treatment in an anaerobic biological reactor. In: Zanetti P, Brebbia CA, editors. Development and Application of Computer Techniques to Environmental Studies VI. California, USA: Computational Mechanics Publications, 1996: 1–727.

  • Francke KP, Miessner H, Rudolph R. Plasma catalytic treatment of complex VOCs in a ground water cleaning facility. Proceedings of the 2000 XIII International Conference on Gas Discharges and their Applications, Glasgow, 2000; 676–679.

  • Garba OY. Separation of volatile organic compounds (BTEX) from aqueous solutions by a composite organophilic hollow fiber membrane-based pervaporation process. J Membr Sci 2008; 319: 82–90.

  • Gerrity D, Stanford BD, Trenholm RA, Snyder SA. An evaluation of a pilot-scale non-thermal plasma advanced oxidation process for trace organic compound degradation. Water Res 2010; 44: 493–504.

  • Goel M, Hongqiang H, Mujumdar AS, Ra MB. Sonochemical decomposition of volatile and non-volatile organic compounds: a comparative study. Water Res 2004; 38: 4247–4261.

  • Goldstein AH, Galbally IE. Known and unexplored organic constituents in the Earth’s atmosphere. J Environ Sci Technol 2007; 1515–1521.

  • Gomez E, Amutha Rani D, Cheesman CR, Deegan D, Wise M, Boccaccini AR. Thermal plasma technology for the treatment of wastes: a review. J Hazard Mater 2009; 161: 614–626.

  • Grodowska K, Parczewski A. Organic solvents in the pharmaceutical industry. Acta Polon Pharm Drug Res 2010; 67: 3–12.

  • Grote B. Application of advanced oxidation processes (AOP) in water treatment. 37th Annual old Water Industry Operations Workshop Parklands, Gold Coast, 2012; 17–23.

  • Gupta SK, Gupta SK, Hung Y. Treatment of pharmaceutical waste. Taylor and Francis Group, LLC, 2006: 167–233.

  • Hammer T. Application of plasma technology in environmental techniques. Contrib Plasma Phys 1999; 39: 441–462.

  • Hand DW. Aeration System Analysis Program (ASAP™). National Center for Clean Industrial and Treatment Technologies (CenCITT), Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, 1991: 1–5.

  • Hand DW, Hokanson DR, Crittenden JC. Gas-liquid processes: principles and application. In: Edzwald JK, editor. Water quality and treatment, a handbook on drinking water. McGraw Hill, New York: American Water Works Association, 2011: 6.1–6.63.

  • Harisson DP, Valsaraj KT, Wetzel DM. Air stripping of organics from ground water. Waste Manage 1993; 13: 417–429.

  • Heinicke G, Åström J, Hartlid C, Petterson S, Bergstedt O, Ekvall A. Application of a QMRA model for surface water treatment to investigate a waterborne outbreak of calicivirus. Global Conference on Microbial Contaminants in Drinking Water, Singapore, October 2009.

  • Huang J, Shang C. Air stripping. In: Wang LK, Hung Y, Shammas KN, editors. Hand book of environmental engineering: advanced physicochemical processes. New Jersey: Humana Press, Inc., 2006: 47–78.

  • Inoue K, Okano H, Yamagata Y, Muraoka K, Teraoka Y. Performance tests of newly developed adsorption/plasma combined system for decomposition of volatile organic compounds under continuous flow conditions. J Environ Sci 2011; 23: 139–144.

  • IPCC. 2006 Intergovernmental Panel on Climate Change (IPCC) Guidelines for National Greenhouse Gas Inventories. Prepared by the National Greenhouse Gas Inventories Programme. In: Eggleston HS, Buendia L, Miwa K, Ngara T, Tanabe K, editors. Japan: IGES, 2006.

  • Kartheek BR, Maheswaran R, Kumar G, Sharmila Banu G. Biodegradation of pharmaceutical wastes using different microbial strains. Int J Pharm Biol Arch 2011; 2: 1401–1404.

  • Kim S, Deshusses MA. Determination of mass transfer coefficients for packing materials used in biofilters and biotrickling filters for air pollution control-2: development of mass transfer coefficients correlations. Chem Eng Sci 2008; 63: 856–861.

  • Kolpin DW, Furlong ET, Meyer MT, Thurman EM, Zaugg SD, Barber LB, Buxton HT. Pharmaceuticals, hormones and other organic wastewater contaminants in US streams, 1999–2000: a national reconnaissance. Environ Sci Technol 2002; 36: 1202–1211.

  • Kuroki T, Hirai K, Kawabata R, Okubo M, Yamamoto T. Decomposition of adsorbed xylene on adsorbents using non thermal plasma with gas circulation. IEEE Trans Ind Appl 2010; 46: 672–679.

  • Kutzer S, Wintrich H, Mersmann A. Air stripping – a method for treatment of wastewater. Chem Eng Technol 1995; 18: 149–155.

  • Lee VKC, Porter JF, McKay G. Development of fixed-bed adsorber correlation models. Ind Eng Chem Res 2000; 39: 2427–2433.

  • Lelieveld J, Hoor P, Jöckel P, Pozzer A, Hadjinicolaou P, Cammas JP, Beirle S. Severe ozone air pollution in the Persian Gulf region. Atmos Chem Phys 2009; 9: 1393–1406.

  • Lin M, Zhao Z, Cui F, Wang Y, Xia S. Effect of initial chlorobenzene concentration, air flow rate and temperature on mass transfer of chlorobenzene by air stripping. Desal Water Treat 2012; 40: 215–223.

  • Linek V, Sinkule J, Janda V. Design of packed aeration towers to strip volatile organic contaminants from water. Water Resources 1998; 32: 1264–1270.

  • Lo IC, Alok PO. Computerized methodology for evaluating drinking water treatment technologies: part I. Water Air Soil Pollut 2000; 117: 61–81.

  • Locke RB, Sato M, Sunka P, Hoffmann MR, Chang JS. Electrohydraulic discharge and non-thermal plasma for water treatment. Ind Eng Chem Resources 2006; 45: 882–905.

  • Loures CCA, Alcântara MAK, Filho HJI, Teixeira ACSC, Silva FT, Paiva TCB, Samanamud GRL. Advanced oxidative degradation processes: fundamentals and applications. Int Rev Chem Eng 2013; 5: 102–120.

  • Lowe JP. Variation of vapour pressure with temperature, 1990: 1–9. Available from: Accessed October 8, 2013.

  • Lu N, Li J, Wang X, Wang T, Wu Y. Application of double-dielectric barrier discharge plasma for removal of pentachlorophenol from wastewater coupling with activated carbon adsorption and simultaneous regeneration. Plasma Chem Plasma Process 2011; 32: 109–121.

  • McKinney DC, Lin M. Pump and treat ground water remediation system optimization. J Water Resources Plann Manage 1996; 122: 128–136.

  • Melcer H. Monitoring and modeling VOCs in wastewater facilities. Environ Sci Technol 1994; 28: 328–335.

  • Mead E, Leibbert J. A comparison of packed column and low profile sieve tray strippers. Proceedings of the 1998 Conference on Hazardous Waste Research, 1998: 1–7.

  • Minnich M. Behavior and determination of volatile organic compounds in soil: a literature review. Las Vegas, NV: U.S. Environmental Protection Agency, 1993: 1–118.

  • Mohammed YS, Mokhtar AS, Bashir N, Abdullahi UU, Kaku SJ, Umar U. A synopsis on the effects of anthropogenic greenhouse gases emissions from power generation and energy consumption. Int J Sci Res Publ 2012; 2: 1–6.

  • Montgomery JM. Water treatment principles and design. New York: John Wiley & Sons, 1985: 237–261.

  • Moran MJ, Hamilton PA, Zogorski JS. Volatile organic compounds in the nations ground water and drinking-water supply wells – a summary. US Geological Survey Fact Sheet 2006–3048.

  • Mourad K, Berndtsson R, Abu-Elsha’r W, Qudah MA. Modelling tool for air stripping and carbon adsorbers to remove trace organic contaminants. Int J Thermal Environ Eng 2012; 4: 99–106.

  • Navaladian S, Janet CM, Viswanathan B, Viswanath RP. On the possible treatment procedure for organic contaminants. Res Signpost 2007; 37/661: 1–51.

  • Negrea P, Sidea F, Negrea A, Lupa L, Ciopec M, Muntean C. Studies regarding the benzene, toluene and o-xylene removal from wastewater. Chem Bull “POLITEHNICA” Univ (Timisoara) 2008; 53: 144–146.

  • Nehra V, Kumar A, Dwivedi HK. Atmospheric non thermal plasma sources. Int J Eng 2008; 2: 53–68.

  • Nirmalakhandan N, Speece RE, Peace JL, Jang W. Operation of counter current air stripping towers at higher loading rates. Water Resources 1993; 27: 807–813.

  • NWRI. Removal of MTBE from drinking water using air stripping: case studies. National Water Resources Institute, California, USA, 2006. Available from: Accessed April 9, 2014.

  • Peng M, Vane LM, Liu SX. Recent advances in VOCs removal from water by pervaporation. J Hazard Mater 2003; B98: 69–90.

  • Preis S, Klauson D, Gregor D. Potential of electric discharge plasma methods in abatement of volatile organic compounds originating from the food industry. J Environ Manage 2013; 114: 125–138.

  • Raschig Jaeger Technologies. General Product Information: Product Bulletin 100. Mundenheimer Strasse 100, 67061 Ludwigshafen – Germany, 2006; 1–20.

  • Reidy PJ, Lyman WJ, Noonan DC. Assessing UST corrective action technologies: early screening of cleanup technologies for the saturated zone. EPA/600/2-90/027, U.S. EPA, Risk Reduction Engineering Laboratory, Cincinnati, 1990: 124.

  • Richardson JF, Harker JH, Backhurst JR. Particle technology and separation processes. London: Butterworth and Heinemann, 2002: 682–701.

  • Robert PV, Hopkins GD, Muz C, Riojas AH. Evaluating two resistance models for air stripping of volatile organic contaminants in a countercurrent pack column. Environ Sci Technol 1985; 19: 164–173.

  • Russsell HH, Matthews JH, Sewell GW. EPA Ground Water Issue: TCE removal from contaminated soil and ground water. A publication of United States Environmental Protection Agency, EPA/540/S-92/002, 1992: 1–10.

  • Saien J, Ojaghloo Z, Soleymani AR, Rasoulifard MH. Homogeneous and heterogeneous AOPs for rapid degradation of Triton X-100 in aqueous media via UV light, nano titania hydrogen peroxide and potassium persulfate. Chem Eng J 2011; 167: 172–182.

  • Samadi MT, Nasseri S, Mesdaghinia AR, Alizadefard MR. Removal of chloroform (CHCl3) from Tehran drinking water by GAC and air stripping columns. Iran J Environ Health Sci Eng 2004; 1: 5–12.

  • Schultz TE. Biotreating process waste water: airing the options. Chem Eng Mag 2005. Available from:

  • Simpson H, Conant, Myslik J. Protecting the quality of groundwater supplies. Fact sheet Ministry of Agriculture, Food and Rural Affairs, Ontario, 2006: 1–4.

  • Slater CS, Savelski MJ, Hesketh RP, Frey E. The selection and reduction of organic solvents in pharmaceutical manufacture. American Chemical Society 10th Green Chemistry and Engineering Conference Washington, 2006.

  • Spencer C, Witco J. Evaluation and assessment of removal technology for specific organic contaminant in NJ drinking water. Black & Veatch Project No. 161096, 2008: 1–47. Available from: Accessed April 7, 2014.

  • Srinivasan A, Chowdhudry P, Viraraghavan T. Air stripping in industrial wastewater in water and wastewater treatment technologies. Volume 1. London: UNESCO and EOLSS, 2011; 88–110.

  • Subrahmanyam C, Renken L, Kiwi-Minsker L. Novel catalytic non-thermal plasma reactor for the abatement of VOCs. Chem Eng J 2007; 134: 78–83.

  • Surinder PS, James HW, Robert MC, John FV, Andrew JL, Gregory DR, Richard AA, Mike GE. Removal of volatile organic compounds from groundwater using a rotary air stripper. Ind Eng Chem Res 1992; 31: 574–580.

  • Suthersan SS. Pump and treat systems, remediation engineering: design concepts. USA: CRC Press, 1999: 1–36.

  • USEPA. Federal Cleaning Air Act amended 1990. U.S. Environmental Protection Agency, Washington, DC, 1990. Available from:

  • USEPA. Engineering Bulletin. Air stripping of aqueous solutions. U.S. Environmental Protection Agency, Washington, DC, EPA/540/2-91/022, 1991: 1–12.

  • Vandenbroucke AM, Morent R, Geyter ND, Leys C. Non-thermal plasmas for non-catalytic and catalytic VOC abatement. J Hazard Mater 2011; 195: 30–54.

  • Wang LK, Hung Y, Shammas KN. Hand book of environmental engineering: advanced physicochemical processes. New Jersey: Humana Press, Inc., 2006: 47–78.

  • Worrall M, Zuber I. Control VOC’s in refinery wastewater. Proceedings of the Process Optimization Conference, Houston, TX, 1996: 1–4.

  • Wolf DE, Kidd FD, Legg AB. A comparison of empirically generated and actual mass transfer coefficients in air stripping towers for the removal of dissolved gasoline constituents from ground water. Tampa, FL: Delta Environmental Consultants, Inc., 1989: 441–455.

  • Wuebbles DJE, Hayhoe K. Atmospheric methane and global change. Earth-Sci Rev 2002; 57: 177–210.

  • Yaqub A, Ajab H. Applications of sonoelectrochemistry in wastewater treatment system. Rev Chem Eng 2013; 29: 123–130.

  • Zareei F, Ghoreyshi AA. Modeling of air stripping-vapour permeation hybrid process for removal VOCs from wastewater and VOCs recovery. World Appl Sci J 2011; 13: 2067–2074.

  • Zhang H, Cheng D. Mathematical model for a fixed bed adsorptive reactor. Carbon 2000; 38: 877–880.

  • Zhu T, Li J, Lang Y, Ma G. Decomposition of benzene by non-thermal processing: photocatalyst and ozone effect. Int J Environ Sci Technol 2008; 5: 375–384.

  • Zorgoski JS, Carter JM, Ivahnenko T, Laphan WW, Moran MJ, Rowe, BL, Squillace PL, Toccalino PL. The quality of nation’s water-volatile organic compounds in the nation’s ground water and drinking water supply wells. US Geol Surv Circ 2006; 139: 101–102.

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