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Background organic matter in the Rhine River significantly affected the behavior of trichloroethene (TCE) and 1,2,4‐trichlorobenzene (TCB) in granular activated carbon (GAC) columns. The GAC column adsorption capacity for TCE was found to be more than 50 percent less than that found in batch adsorption experiments. The capacity for TCE of GAC preloaded with organic matter was found to be very similar to that of a TCE‐spiked GAC column, suggesting that the preloading isotherm approach can be useful in predicting GAC column capacity. Because of long‐term reductions in adsorption capacity, the breakthrough of TCE in a full‐scale column is not well predicted by the direct scaleup approach. Complete removal of TCB, presumably by biodegradation, was found after 40 days of operation.
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Summers et al. (1989) studied this question.
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