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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I contain protein, fat, calcium, phosphorus, iron,...... particularly in the iron content is particularly high, eating can prevent anemia. Because of its rich pectin, but also prevent constipation.

我含有蛋白质、脂肪、钙、磷、铁……尤其是铁含量特别高，吃了能防贫血。因富含果胶，还能防便秘。

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And usually request steel phosphorus content of less than 0.045%, lower request high quality steel.

因而通常请求钢中含磷量小于0.045%，优质钢请求更低些。

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