Experience of operating wastewater treatment facilities with two-stage nitrification-denitrification flow scheme

Summary

The results of field testing pilot treatment facilities with a capacity of 12,000 m³/day with two-stage nitrification-denitrification flow scheme are presented. The results of evaluating different methods of mixed liquor mixing within denitrification zones alongside with treatment facilities design procedure are given. It is shown that the use of mechanical mixers will provide for the required oxygenic mode in denitrification zones and improve the efficiency of total nitrogen and nitrite elimination.

Key words

wastewater , biological treatment , nitrification , activated sludge , biogenic elements , denitrification , ammonium salts , mixing devices