内循环生物流化床水力及生物硝化特性研究

Study on Hydraulic Characteristics and Biological Nitrification of Internal-Circulation Biological Fluidized Bed

采用一种新型轻质多孔性载体，研究了内循环生物流化床的水力特性。结果表明，在降流区接近于推流式，而升流区接近于完全混合式，整个反应器可以模拟为一个推流式和一个完全混合式的串联。随着下向流速增加，膨胀率和回流比呈正比增加。该系统对ＮＨ＋４－Ｎ去除率达９０％以上，容积负荷最大为２ｋｇＮ／（ｍ３·ｄ），出水稳定，抗冲击能力强。循环速度和通气量对处理效果有较大影响。

A study on hydraulic characteristics and biological nitrification of internal-circulation biological fluidized bed using a new kind of light and porous carrier were reported in this paper. The results showed that the reactor flow-pattern in down-flow zone and up-flow zone approximated to plug-flow and complete-mixing respectively. Whole reactor was simulated as a system of plug-flow and complete-mixing in series. The expansion and recycling ratio were directly proportional to the down-flow velocity. More than 90% of NH + 4-N could be removed by the system with maximum volumetric loading of 2 kgN/(m 3·d). The system performance was stable, tolerant of shock load.