Nitrification and denitrification equipment using biofilm

摘要

PURPOSE:To downsize equipment and to improve the recovery ratio of treated water. CONSTITUTION:Raw water is supplied from a raw water supply part 11 at the upper end of a nitrification-denitrification biological membrane filter bed 3 in which an aerobic biological membrane filter bed 1 is installed on the upper stage and an anaerobic biological membrane filter bed 2 is installed on the lower stage to nitrify MH4-N. The nitrified liquid, after being mixed with a hydrogen donor, is denitrified in the lower stage. The anaerobically treated water is returned to the upper end of the nitrification-denitrification biological membrane filter bed 1 by a circulating pump 6 and discharged as treated water from a treated water discharge part 12 placed between the upper and lower stages.