This thesis use the methods of ultra-filtration, phosphate buffer, flowing-alkaline, centrifugal to concentrate the Yoghurt starter, and optimize the processing techniques of it.

本试验综合采用超滤法、缓冲盐法、流加碱中和法、离心法浓缩菌体，优选工艺路线，为规模化生产奠定基础。

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High speed, the magnetic particles by centrifugal force big, unit time magnetic double function was added, concentrate grade and processing capacity are high, but recovery rate is lower.

转速高，矿粒所受离心力大，单位时间内磁翻作用曾加，精矿品位与处理能力都高，而回收率则降低。

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