Fenton试剂在钻井废水处理中的应用

APPLICATION OF FENTON REAGENT OXIDIZATION IN DRILLING WASTEWATER DISPOSAL

针对钻井作业后期废水化学需氧量（CODCr）高的特点，在混凝法对钻井废水进行预处理的基础上，采用Fenton试剂对预处理水进一步氧化。实验表明，常温下，介质pH3～4，30％的H2O2投加1％，FeSO4·7H20投加0．05％，反应3～4h，氧化工艺环节对钻井废水COD去除率可达到75％以上。现场处理钻井废水达到了《污水综合排放标准》（GB8978-1996）一级标准，以Fenton试剂为氧化单元的工艺在处理钻井废水中具有较高的推广应用价值。

Disposing wastewater produced at later drilling stage is characterized by higher chemical oxygen demand(CODCr ), so, Fenton reagent is recommended for secondary disposal after retreating drilling wastewater with the coagulation method. The results showed that, in normal temperature,in the optimum condition of pH 3-4,adding 1% of 30%H2O2 and 0.05% of FeSO4(7H2O,reaction time 3-4 hours,the COD removal was more than 75%. The treated wastewater reaches the first level of the Integrated Wastewater Discharge Standard ( GB8978 - 1996). Fenton reagent oxidation method has higher market value in drilling wastewater treatment.