The pass percent of the water quality after sewage treatment in Weigang Combination Station in 2003is only70%, which forms the severe threat on the stratum layer' s safety.

2003年，魏岗联合站污水处理水质合格率只有70%，严重影响到魏岗油田注水合格率，对地层安全形成了极大的威胁。

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The pass percent of the water quality after sewage treatment in Weigang Combination Station in 2003is only70%, which forms the severe threat on the stratum layer' s safety.

2003年，魏岗联合站污水处理水质合格率只有70%，严重影响到魏岗油田注水合格率，对地层安全形成了极大的威胁。

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