Simultaneous nutrients and carbon removal from low-strength domestic wastewater with an immobilised-microorganism biological aerated filter

摘要

To improve the efficiency of low-strength domestic wastewater treatment, an immobilisedmicroorganismnbiological aerated filter (I-BAF) was established for simultaneous carbon, nitrogennand phosphorus removal. The I-BAF performance was systematically evaluated under continuousnand intermittent aeration modes. At the optimal condition with an intermittent aeration controlnschedule of 2 h on/1 h off, the maximum removal rates of COD, NH4nþ-N, TN and P were 82.54%,n94.83%, 51.85% and 61.49%, respectively, and the corresponding averaged effluents could meetnthe first class standards of China. Further analysis of PCR-DGGE profile revealed that members ofnthe gamma and alpha proteobacterium bacterial groups were probably responsible for thennitrogen and phosphorus removal. The I-BAF system showed excellent performance in carbonnand nutrients removal, which provided a cost-effective solution for the treatment of low-strengthndomestic wastewater.