Nitrification and Denitrification in BACF for Treating High Ammonia Source Water
BACF处理高氨氮进水的硝化与反硝化作用

A high ammonia micropolluted source water advanced treatment for ammonia removal by biological activated carbon filter was tested. The removal rate of ammonia was high than 95 % when influent concentration was under 1.0mg/L. The removal rate decreased with the influent concentration increased when the ammonia concentration was in range of 1.5 - 4.9mg/L and the influent DO was under 10mg/L, and the minimum removal rate was about 30%. The key factor of restrict nitrification in BACF was the influent DO. When the influent ammonia concentration was high, the DO in water was depleted quickly by nitrify and hetetrophic bacteria in 0.4m deep of filter and the filter layer was divided to aerobic zone and anoxic zone. The denitrlfication was occurred in the anoxie zone, and because of very low concentration of electron donor led to accumulation of the denitrifieation intermediates such as NO2^-. Aerobic bacteria was existed in the anoxic zone.