Harmful contaminants such as Cr(VI) and TCE can be removed from groundwater by reactions with chemically reduced subsurface sediments. This paper studies the optimal selection of the number of wells, the injection rate, and the number of regenerations of a large-scale Fe(II) barrier for Cr(VI) remediation at Hanford, WA. The process model consists of two parts: (a) the creation of the Fe(II) barrier by the injection of a dithionite reagent and (b) the reoxidation of the barrier by Cr(VI) and oxygen in the invading groundwater. The solution to the process model is used to develop the total cost as a function of the design variables. This cost model is applied to the Cr(VI) contamination at Hanford to obtain the optimal design configuration and its sensitivity to cost and process uncertainties.
展开▼
