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www.drink-water-eng-sci-discuss.net/2/79/2009/
doi:10.5194/dwesd-2-79-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Removal of radio N-nitrosodimethylamine (NDMA) from drinking water by coagulation and Powdered Activated Carbon (PAC) adsorption
1R&D Center, Samsung Engineering Co. Ltd., 415-10 Woncheon-Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, 443-823, Korea
2Department of Civil and Environmental Engineering, University of South Carolina, Columbia, SC 29208, USA
3Department of Civil and Environmental System Engineering, Hanyang University, 1271 Sa-1 Dong, Ansan, Gyeonggi-Do, 425-791, Korea
Abstract. The presence of N-nitrosodimethylamine (NDMA) in drinking water supplies has raised concern over its removal by common drinking water treatment processes. A simple detection method based on scintillation spectroscopy has been used to quantify the concentration of 14C-labeled NDMA at various ratios of sample to scintillation liquid. Without sample pretreatment, the method detection limits are 0.91, 0.98, 1.23, and 1.45 ng/L of NDMA at scintillation intensity ratios of 10:10, 5:15, 15:5, and 2.5:17.5 (sample: scintillation liquid), respectively. The scintillation intensity in all cases is linear (R2>0.99) and is in the range of 0 to 100 ng/L of NDMA. In addition, because scintillation intensity is independent of solution pH, conductivity, and background electrolyte ion types, a separate calibration curve is unnecessary for NDMA samples at different solution conditions. Bench-scale experiments were performed to simulate individual treatment processes, which include coagulation and adsorption by powdered activated carbon (PAC), as used in a drinking water treatment plant, and biosorption, a technique used in biological treatment of waste water. The commonly used coagulation process for particulate control and biosorption is ineffective for removing NDMA (<10% by coagulation and <20% by biosorption). However, high doses of PAC may be applied to remove NDMA.
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Citation: Chung, J., Yoon, Y., Kim, M., Lee, S.-B., Kim, H.-J., and Choi, C.-K.: Removal of radio N-nitrosodimethylamine (NDMA) from drinking water by coagulation and Powdered Activated Carbon (PAC) adsorption, Drink. Water Eng. Sci. Discuss., 2, 79-100, doi:10.5194/dwesd-2-79-2009, 2009. Bibtex EndNote Reference Manager XML
