改性聚氨酯填料在曝气生物滤池中的应用

Application of Modified Polyurethane Filler in Biological Aerated Filter

填料作为曝气生物滤池(BAF)的核心组成部分,直接影响BAF的运行特性和效果。通过开展BAF深度处理中试,采用改性聚氨酯填料(MPF)和陶粒填料对比试验,探索MPF曝气生物滤池在硝化、反硝化过程中的主要影响因素。试验结果表明:采用MPF的BAF,硝化和反硝化的最佳水力停留时间(HRT)都为30 min;一定HRT范围内,除SS指标外,以MPF为载体的BAF具有更高的污染物去除效果;反硝化效果最佳C/N为4.5,最佳反洗周期为4~5 d,而硝化阶段最佳反洗周期为6~8 d。综上,在处理量相同的试验条件下,采用MPF比陶粒,BAF处理效率更高、反洗频次更少、节能降耗更明显,具有更显著的应用价值。

As the key component of biological aerated filter(BAF), filters directly affect the operation characteristics and effect of BAF. The main influencing factors in the process of nitrification and denitrification of MPF biological aerated filter(BAF) were explored by carrying out the pilot test of advanced treatment of BAF and using the comparison test of modified polyurethane filler(MPF) and ceramic filler BAF. Results showed that the best HRT of nitrification and denitrification in BAF filled by MPF was 30 minutes. In a certain range of HRT, except SS, BAF filled by MPF had higher pollutant removal efficiency than that of ceramsite filter. The best denitrification effect of C/N ratio was 4.5, and the best backwashing cycle was 4~5 days in BAF filled by MPF, while the best denitrification of backwashing cycle was 6~8 days in BAF filled by MPF. In conclusion, BAF filled by MPF has higher treatment efficiency, less backwash frequency, more obvious energy saving and consumption reduction than ceramsite BAF under the same treatment capacity test conditions. And it has more significant application value.