Ammonia removal characteristics by biofilter using inorganic carriers seeded with nitriifying bacteria enriched from night soil sludge

Abstract

Production Ammonia removal by biofilters was conducted mainly using organic packing-materials as a carrier like peat (1,2) or wood bark (3), but inorganic packing materials (4,5) were rarely used. In this study, as inorganic packing materials, porous ceramic (A) and foamed inorganic material covered with glass layer (C) which was porous and light, were used. To shorten the acclimation period, nitrifYing bacteria enriched from night soil sludge were applied to biofilters. The ammonia removal characteristics by A and C biofilters were investigated.