AEROBIC NITRATING DENITRIFICATION PROCESS

摘要

PURPOSE: To simplify a process constitution, the operation facilitate and also efficiently perform nitrating/denitrification of sewage by placing alternately an aerobic stage and an anaerobic stage in multistage at the time of aerobically nitrating/denitrifying biologically an org. sewage containing a reducing type sulfur. ;CONSTITUTION: At first, waste water 1 is introduced into a hydrogen fermentation tank 2, where org. matters are decomposed at the time of treating a sulfur and ammonia-containing waste water such as night soil. Then, a fermented nitrated liq. 21 is introduced into an aerobic tank 3, and also a hydrogen sulfide 11 obtained by washing and desulfuring 10 a generated gas 9 is introduced into a selection tank 4 to control a concn. of total reducing type sulfur in the fermented nitrated liq. At this time, a tank in which aerobic tank/selection tank are made to be one unit are arranged in multi-stages (3, 5)/(4, 6) at an aerobic nitrating denitrification process. In the last selection tank 6, is a mixed gas 13 of a gaseous hydrogen and a gaseous CO₂ is introduced by using a blower 14. Then, an efluent from the last selection tank 6 is introduced into a solid-liq. separation process 7 and this denitrifed water is discharged to outside, and also a concentrated fungus body is returned to the aerobic tank 3 as a return sludge 19.;COPYRIGHT: (C)1996,JPO