科研之友
微信
新浪微博
Facebook
分享链接
摘要
In this study, aiming at the stable operation of the system and the effect of denitrification and phosphorus removal under the high MLSS, the Micro-Pressure Inner-Loop Bioreactor (MPR) was used to treat simulated urban sewage, and its effects of denitrification and phosphorus removal under the condition of the continuous reduction of residual sludge discharge at SRTs of 50, 70 and 90 days. The results showed that when SRT increased from 50 d to 90 d, the denitrification performance of MPR process was strengthened, and the average removal rate of TN increased from 75.97% to 84.60%. At the same time, after SRT was extended, the TP removal rate of MPR process decreased, but the TP removal rate was stably over 97%, and ultra-long SRT had slight effect on TP removal. When SRT was 90 d, the average MLSS and SVI during stability period of the system were 13 252 mg·L?1 and 70 mL·g?1, respectively. At this time, the system had the best performance on denitrification and phosphorus removal. The average effluent mass concentrations of COD, NH+4-N, TN, TP were 24.73, 0.49, 6.99, 0.07 mg·L?1, respectively, and the water quality of effluent was better than the GB18918-2002 grade A standard. The study shows that under the ultra-long SRT, the MPR system can not only run stably for a long time, but also ensure high denitrification and phosphorus removal effects.
- 单位
