If the sludge content is over 15%, the wastewater should be separated by means of centrifuge;
含渣率在15％以上的钻井废水应采用离心机进行分离；
The results show that with the increase of sludge content, the compressive strength of the sludge tile decreases rapidly and the flexural strength increases slightly.
实验表明：随污泥含量增加，烧制成品的抗压强度显著下降，抗折强度略有增加。
Other scientists have looked at materials like leaf compost or manure, while Professor Brown favors composts high in iron content, like the sludge from wastewater treatment.
其他科学家们寄希望于树叶堆肥或粪肥一类的物质，而布朗教授更偏爱铁含量较高的堆肥，例如来自废水处理过程中的污泥。
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