The bacterial community amount in activated sludge was larger than that in granular sludge, and their change trends were consistent basically with the change of removal rate of ammonia nitrogen.
絮状污泥中细菌种群数量高于颗粒污泥，且两者的变化趋势与氨氮去除率的变化基本一致。
A great number of experiments were carried out on measuring the bacterial removal rate of medium-efficiency filter material in air filters.
通过大量试验，测定了空气过滤器中效滤材的滤菌效率。
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