Abstract
In order to reuse the advanced treatment water, the experiments of simultaneous removal of nitrogen (T-N) and suspended solids (SS) were carried out by using downflow process. The hydrogen donor used for denitrification reaction was methanol. The denitrification layer used in the experiments were the burned aggregate and anthracite. Also, the filtration layer used was usually sand on the marketed. The ability for both denitrification and filtration were examined, and then mass balance of SS and recovery of denitrification after backwashing operation were investigated. Furthermore, the accreted denitrification bacteria in denitrification layer was counted by most probable number (MPN) method.
The difference of performance for two kinds of denitrification packings was not observed. Under 0.1hr of HRT, 0.3 mg · l-1 of SS and 1mg · l-1 of T-N in effluent were attained. However, the increased biomass of denitrification bacteria was very much at above described HRT. Feed methanol for denitrification did not detect in effluent. In addition, in the cause of the flow of 2 times for packing volume, the denitrification after backwashing operation was recovered.
