Distribution of organic compounds in leachate

An initial solute concentration must be selected for the application of solute transport models. An initial concentration for each solvent was based on the chemical composition of leachates from hazardous-waste sites. Where available, the largest reported concentration was used in the modeling efforts (Table 17.2.1). No published data were located for some of the solvents such as cyclohexanone. In such cases, the initial concentration was arbitrarily assigned as 1,000 mg/L or it was equated to the compound s solubility in water. Hexane, decane, and tetrahydofuran were not included in fliese studies. 

The amount of mass of each organic compound entering the aquifer via the double-liner system was calculated using these initial leachate concentrations. There was a continuous 12.2-meter head driving flie leachate through the liner. Leachate was predicted to 

A mass-loading rate was conservatively calculated for each solvent as, 

the mass loading rate (mass/time/area), 

In brief, die eomputer simulations predieted diat all 28 organie eompounds would eventually migrate from the waste treneh, and be deteeted at the eomphanee well. The predicted concenirations varied by four orders of magnitude, and were largely influenced by the initial concentrations used in calculating the mass loading rate to die aquifer. 

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