Groundwater containment

Simultaneous degradation of 2,4- and 2,6-DNT has been achieved in a fluidized-bed biofilm reactor (Lendemann et al. 1998) that was successfully operated with contaminated groundwater containing 2- and 4-nitrotoluenes and 2,4- and 2,6-DNTs. The nitrite that was produced during degradation was recovered as nitrate. 

Amy, G.L., Narbaitz, R.M., and Cooper, W.J. Removing VOCs from groundwater containing humic substances by means of coupled air stripping and adsorption, J. Am. Water Works Assoc., 79(l) 49-54, 1987. 

Remediation of groundwater containing soluble metals such as chromium,... 

The Waterloo Barrier is a low-permeability cutoff wall for groundwater containment and control. The technology uses steel sheet piling with joints that can be sealed after the sheets have been driven into the ground. This technology has also been used as a soil-gas barrier. 

Groundwater contains dissolved minerals, and, in practice, brine is used as the aqueous component. 

For U, which would exist in the hexavalent state (species of 002 + in an aerated system) the distribution coefficients are low. This is expected in a groundwater containing COs -, leading to the formation of soluble anionic complexes. 

Consider the hydrolyses of methyl bromide (Reaction 1 in Table 13.2) and ethyl acetate (reaction 5 in Table 13.2) at 25°C and pH 7.0 in a contaminated groundwater containing 100 mM Cl and 1 mM Br. Assume that neither the pH nor the inorganic species concentrations change significantly during the reaction. Also assume that the activity coefficients of all species are 1. To what extent do the two compounds hydrolyze under these conditions ... 

You work in a research laboratory and your job is to investigate the microbial degradation of organic pollutants in laboratory aquifer column systems. You supply a column continuously with a synthetic groundwater containing 0.3 mM 02, 0.5 mM NOj, 0.5 mM SO -, and 1 mM HCOj, as well as 0.1 mM benzoic acid butyl ester, which is easily mineralized to C02 and H20. The temperature is 20°C and the pH is 7.3 (well buffered). Would you expect sulfate reduction or even methanogenesis to occur in this column Establish an electron balance to answer this question. 

Herrling, B., Stamm, J., Alesi, E.J., Bott-Breuning, G. Diekmann, S. (1994). In situ bioremediation of groundwater containing hydrocarbons, pesticides, or nitrate using vertical circulation flows (UVB/GZB technique). In Air Sparging for Site Remediation, ed. R. Hinchee, pp. 56-80. Boca Raton, FL CRC Press. 

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