ABSTRACT
The levels of Rn and U are considered to be extremely high, with the Rn being the highest known level the authors are aware of for a drinking water supply. This chapter presents the engineered solution to an environmental health problem. In terms of removal efficiency loss the relatively high mass of adsorbed U appears to have very minimal effect on the Rn adsorption/decay steady state. While this makes sense in terms of what is logical, it is sometimes difficult to show a similar correlation for other wells, and certainly difficult to quantify to any degree. The achievement of steady state took approximately 10 days, which is typical for other field installations. The GAC system designed for 222Rn removed essentially all the U present in the water supply until sometime between day 100 and day 200.
