交替式间歇曝气移动床生物膜反应器同步脱氮除磷

Simultaneous Nitrogen and Phosphorus Removal in an Alternating Intermittent Aeration Sequencing Moving Bed Biofilm Reactor

中试研究了交替式间歇曝气移动床生物膜反应器(MBBR)处理低含量城市污水,考察了反应器RI(填装聚氨酯海绵填料)和RII(填装聚乙烯悬浮填料)在不同间歇周期运行模式下的运行性能。结果表明,2组反应器运行良好。在合适的工况条件下,RI出水COD和NH3-N、TN、TP、SS的质量浓度平均分别为21.23 mg/L和3.27、5.92、0.55、9 mg/L;RI的同步脱氮除磷效果优于RII,COD和SS处理效果与后者相当。在污水低碳源状况下,RI采用的间歇周期变水位运行模式有利于提高污水中碳源的利用率,改善反应器同步脱氮除磷性能。交替式间歇曝气MBBR,能够在单级反应器同一物理空间内同步实现碳氮磷和SS的有效去除,降低曝气消耗,提高同步硝化反硝化效率。

An altemating intermittent aeration sequencing moving bed biofilm reactor （MBBR） was used to treat low strength municipal wastewater. In a pilot-scale plant, the performances of reactor RI and reactor RII were investigated by using different sequencing batch operation modes. The results show that the performances of the two reactors are good. The average effluent concentration of COD, and mass concentration ofNH3-N, TN, TP, SS in the RI is 21.23 mg/L, and 3.27 mg/L, 5.92 mg/L, 0.55 mg/L, 9 mg/L, respectively, under suitable operation conditions. The RI is more efficient in simultaneous nitrogen and phosphorus removal and similar in COD removal and solids separation comparing with that of the RII. Under the condition of low carbon source in sewage, the variable water level operation mode adopted by the RI is beneficial to improve the utilization rate of carbon source and enhance the performance of nutrient removal. The alternating intermittent aeration MBBR can achieve simultaneous removal of carbon, nitrogen, phosphorus and solids separation in the same physical space of single-stage reactor, reduce aeration consumption and increase the efficiency of simultaneous nitrification and denitrification.