DISPOSAL OF DOMESTIC SEWAGE BY HETEROTROPHIC NITRIFICATION-AEROBIC DENITRIFIER BACTERIA IMMOBILIZED WITH BACTERIAL CELLULOSE MEMBRANE

摘要

Heterotrophic nitrification-aerobic denitrifier bacteria were used to treat domestic sewage in this study, and the removal rate of NH_4~+-N was 68.85% within 5 days. Different bacterial cellulose membrane adsorption methods were used to immobilize strains to treat domestic sewage, which indicated that dynamic adsorption method of bacterial cellulose membrane was relatively stable in the course of sewage treatment. After 6 days, the removal rate of total nitrogen was up to 86.66%. In the sequencing batch bioreac-tor, the removal rates of total nitrogen, NH_4~+ and CODcr can reach 80%. In the continuous bioreactor, the removal rates of total nitrogen and NH_4~+-N were up to 50%, and that of CODcr could reach about 70%. Bacterial cellulose membrane used to immobilize heterotrophic nitrification-aerobic denitrifier bacteria was hardly degraded, and has a great application prospect in the treatment of domestic sewage.