高级氧化技术处理高矿化度气田水中缓蚀剂
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中国石油“十三五”规划项目“页岩气地面工艺技术及高效设备研发”(项目编号KY2016-03)


Treatment of Corrosion Inhibitor in Highly Mineralized Gas Field Water by Advanced Oxidation Technology
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    摘要:

    为使处理后的气田水能达到国家二级排放标准,首先向模拟气田水中加入缓蚀剂CPI-W,考察缓蚀剂的添 加对气田水中的COD影响,然后分别采用次氯酸钠法、芬顿试剂法和过硫酸钾-硫酸亚铁法处理添加了缓蚀剂 CPI-W的模拟气田水,考察处理后水中的COD去除效果。结果表明,3种处理方法均能使加注1000 mg/L缓蚀剂 的模拟气田水的COD值达到《污水综合排放标准》的二级排放标准(<150 mg/L)。采用次氯酸钠氧化法处理后, 当次氯酸钠加量为8 mg/L时,COD去除率达94.4%;采用芬顿试剂法处理后,当H2O2加量为4 mg/L、FeSO4·7H2O 加量为0.08 mg/L时,COD去除率达96.1%;而采用过硫酸钾-硫酸亚铁法处理后,K2S2O8加量为8 mg/L、FeSO4· 7H2O加量为4 mg/L时,COD去除率达97.4%。对比分析COD去除率以及药剂成本,3种高级氧化技术中过硫酸 钾-硫酸亚铁法为降解气田废水中缓蚀剂的最优方法。

    Abstract:

    In order to make the treated gas field water meet the national secondary discharge standard,the corrosion inhibitor CPI-W was firstly added to the simulated gas field water to investigate the effect of corrosion inhibitor on chemical oxygen demand (COD)in gas field water,and then the simulated gas field water added with corrosion inhibitor CPI-W was treated by sodium hypochlorite method,Fenton's reagent method and potassium persulfate-ferrous sulfate method to investigate the COD removal effect,respectively. The results showed that all three treatment methods were able to achieve COD values of simulated gas field water spiked with 1000 mg/L corrosion inhibitor to meet the secondary discharge standard(<150 mg/L)of the comprehensive wastewater discharge standard. After treatment by sodium hypochlorite oxidation method,the COD removal rate reached 94.4% when the sodium hypochlorite dosage was 8 mg/L;after treatment by Fenton's reagent method,the COD removal rate reached 96.1% when the H2O2 dosage was 4 mg/L and FeSO4·7H2O dosage was 0.08 mg/L;while after treatment by potassium persulfate-ferric sulfate method,the COD removal rate was 97.4% when K2S2O8 was added at 8 mg/L and FeSO4·7H2O was added at 4 mg/L. Comparing the COD removal rate and the cost of chemicals,the potassium persulfate-ferrous sulfate method was the best method to degrade the corrosion inhibitor in gas field wastewater among the three advanced oxidation techniques.

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  • 在线发布日期: 2022-04-25
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