石油化工废水组成复杂、浓度高、毒性强和难降解，对环境危害大。
Untreated petrochemical wastewaters are harmful to the environment since they typically contain many toxic and persistent organic pollutants in high concentrations.
通过对贮存石油化工废水的湖泊进行研究，考察了其附近的地表水、浅层地下水以及深层地下水的水体污染情况。
Through the study of the lake storing petrochemical wastewater, the pollution status of the surface water, the shallow groundwater and the deep groundwater nearby were investigated.
以涤纶废丝作填料，采用生物接触氧化法直接处理石油化工有机废水。
Biological contact oxidation method has been directly used to treat petrochemical organic wastewater with waste terylene silk as filling.
各类石油化工，钢铁冶金工厂排放的废水中也含有大量硫酸根离子。
The waste water released by various types of petrochemicals, iron and steel metallurgy plant also contains a lot of sulfate ion.
双相不锈钢具有奥氏体和铁素体不锈钢二者之优点，广泛用于石油化工，海水废水处理，造纸机械及承重桥梁等领域。
Duplex stainless steel with the advantages of both austenitic and ferritic stainless steels, widely used in petrochemical, water treatment, paper making machinery and the load-bearing areas of bridge.
双相不锈钢具有奥氏体和铁素体不锈钢二者之优点，广泛用于石油化工，海水废水处理，造纸机械及承重桥梁等领域。
Duplex stainless steel with the advantages of both austenitic and ferritic stainless steels, widely used in petrochemical, water treatment, paper making machinery and the load-bearing areas of bridge.
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