A fluidized bed reactor was studied for denitrification, using sewage as an electron donor. First, the start‐up procedure, volumetric loading rate and organic carbon requirements were analyzed. In a second stage, several packing materials were tested. Selection was based upon availability in developing countries. Tested materials were: sand, coffee grounds (dregs), pumice stone, tezontle stone (volcanic scoria), nut shell and coconut shell. Best results were obtained with pumice stone and nut shell.
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Jiménez et al. (1990) studied this question.
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