The number of bone dust in animal feed is main reasons for high content of phosphorus in its waste water.
动物饲料中加入大量骨粉是其污水中含磷过高的主要原因，而常规活性污泥法对磷的去除率却很低。
The number of bone dust in animal feed is main reasons for high content of phosphorus in its waste water.
动物饲料中加入大量骨粉是其污水中含磷过高的主要原因，而常规活性污泥法对磷的去除率却很低。
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