down-flow fixed bed
... downflow filter 下流式过滤器 down-flow fixed bed 下流式固定床 down-flow pipe 溢流管 ...
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方法采用多孔陶粒作反硝化细菌固定化载体，研究下流式固定床生物反应器的适宜脱氮条件；
Methods Porous ceramics were used as immobilization carrier. Optimum conditions for nitrate-nitrogen removal of downflow fixed-bed bioreactor were studied.
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