由于钻井污水经混凝处理后仍存在COD、色度超标问题，因此需采用其他方法深度处理污水。
Because of the over state standard problems of COD and chromaticity remaining after coagulating drilling sewage, other strong measures of treating sewage were needed.
结果表明，氧含量超标，存在大量的脆性相氧化亚铜，且材料内部仍留有部分残余应力，是失效的主要原因。
Results showed that the fracture was caused by higher content of O2, a large amount of Cu2O and residual stress.
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