If the sludgecontent 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；
2
The results show that with the increase of sludgecontent, 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。
3
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.