천연 제올라이트가 충전된 SBBR을 이용한 암모니아성 질소 함유 폐수처리

Abstract

Continuous experiments in laboratory scale SBBR (Sequencing batch biofilm reactor) with granular natural zeolites were conducted to investigate the effect of ammonium removal and regeneration by ion-exchange and nitrification. The proposed process used the ion exchange material as the media for the nitrifying and denitrifying biomass. The entire process was carried out in a single reactor. The SBBR type of three reactors were prepared for comparison of removal of nitrogen, organics and phosphorus. The first (modified Zeo-SBBR) and the second (Zeo-SBBR) reactors were filled with granular zeolite, and the third (A.C-SBBR) with granular activated carbon. Modified zeo-SBBR and A.C-SBBR were operated in new mode; fill, mix, drain, backwash, and aeration, and zeo-SBBR in conventional mode; fill, mix, aeration, backwash, and drain. The synthetic wastewater having 200 mg/L of NH4+-N was tested in this process. Results of this experiment were that modified zeo-SBBR showed the highest nitrogen removal efficiency. Total nitrogen removal efficiency showed 94% (modified zeo-SBBR), 75% (zeo-SBBR) and 79% (A.C-SBBR) respectively. In the case of modified zeo-SBBR, nitrogen removal was effectively enhanced by ion-exchange of the zeolite. And the zeolite saturated by ammonium was continuously regenerated by nitrification without a regeneration chemical such as NaCl. The results support that the proposed nitrogen removal process is very effective for treating ammonium bearing wastewater.