经过3个阶段的选择和富集，反硝化聚磷菌在聚磷菌中的比例从15 %上升到73% 。

The proportion of DNPAOs increased from 15.5% to 73% of total phosphate accumulating organisms after three phase selection.

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通过多次反萃取可以提高锡的回收率，达到了微量锡与微量锗分离富集的目的。

As stripping trace tin time after time, the rate recovery of tin can be increased, and achieved the aim of the separation and enrichment of trace tin and trace germanium.

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