Ammonia gas transport and reactions in unsaturated sediments: implications for use as an amendment to immobilize inorganic contaminants

Journal of Hazardous Materials
L ZhongY Liu

Abstract

Use of gas-phase amendments for in situ remediation of inorganic contaminants in unsaturated sediments of the vadose zone may be advantageous, but there has been limited development and testing of gas remediation technologies. Treatment with ammonia gas has a potential for use in treating inorganic contaminants (such as uranium) because it induces a high pore-water pH, causing mineral dissolution and subsequent formation of stable precipitates that decrease the mobility of some contaminants. For field application of this treatment, further knowledge of ammonia transport in porous media and the geochemical reactions induced by ammonia treatment is needed. Laboratory studies were conducted to support calculations needed for field treatment design, to quantify advective and diffusive ammonia transport in unsaturated sediments, to evaluate inter-phase (gas/sediment/pore water) reactions, and to study reaction-induced pore-water chemistry changes as a function of ammonia delivery conditions, such as flow rate, gas concentration, and water content. Uranium-contaminated sediment was treated with ammonia gas to demonstrate U immobilization. Ammonia gas quickly partitions into sediment pore water and increases the pH up to 13.2. Injecte...Continue Reading

References

Mar 30, 2004·Environmental Science & Technology·Jiamin WanZuoping Zheng
Apr 15, 2004·Journal of Hazardous Materials·Jean J RenardMichael V Henley
Jul 14, 2007·Environmental Science & Technology·Miles E Denham, Brian B Looney
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May 20, 2011·Journal of Hazardous Materials·Lirong ZhongXiqing Li
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Nov 19, 2013·Journal of Contaminant Hydrology·Rui MaChunmiao Zheng
May 13, 2014·Journal of Environmental Radioactivity·Jim E SzecsodyNancy J Hess

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Citations

Dec 23, 2016·Journal of Environmental Radioactivity·Hilary P EmersonJim Szecsody
Jun 17, 2018·Journal of Environmental Management·Hilary P EmersonJim Szecsody

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