filter-a coarse, hard, predominantly siliceous material-provides the support system to which the denitrifying microorganisms attach. The
carbon source supplements the nitrified influent, providing the microorganisms in the
filter media with a degradable carbonaceous material to metabolize nitrogen. The packed-bed
filter is well-suited for denitrification because it provides the necessary
hydraulic detention time for the biological reaction to take place. It also filters out solids, eliminating...
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