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油田采出水微纳米O3气泡与H2O2耦合处理工艺
Micro-nano O3 bubbles coupled with H2O2 for treatment of produced water from oil fields
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- DOI:
- 作者:
- 张梦忆
Zhang Mengyi
- 作者单位:
- 中国石油华北油田公司二连分公司，内蒙古锡林浩特 026000
- 关键词:
- 微纳米气泡；臭氧；过氧化氢；采出水；动态控制
micro-nano bubble; ozone; hydrogen peroxide; produced water; dynamic control
- 摘要:
- 目前油田采出水处理技术普遍存在流程长、适应性差等问题，因此提出微纳米O3
气泡-H2
O2
高级氧化
耦合工艺。通过对比微纳米O3
气泡与常规O3
气泡的效能差异，探究H2
O2
质量浓度、O3
质量浓度、pH值等关
键参数对处理效果的影响规律，构建以进水COD质量浓度为自变量的H2
O2
质量浓度、O3
质量浓度动态变化预
测模型，利用气相色谱-质谱联用仪（GC-MS）分析并揭示了以羟基自由基氧化为主导的污染物降解路径与中
间产物积累特征。结果显示：微纳米气泡发生系统产生的气泡粒径分布在10~50 μm范围内，平均粒径约为
30 μm，微纳米气泡在强化传质与促进自由基生成方面具有显著优势；3#区块采出水对应的最佳工艺条件为
H2
O2
质量浓度20 mg/L、O3
质量浓度40 mg/L、pH值保持原水状态；最佳O3
投加量与COD质量浓度呈线性关
系，最佳H2
O2
投加量与COD质量浓度呈二次多项式关系；降解路径遵循大分子断裂后生成含氧中间体再部分
矿化的规律，能将原油特征组分降解转化，有机组分总转化率超过75%。研究成果可为油田采出水的高效处理
提供理论依据。
Currently, the treatment technologies for produced water in oil fields often suffer from long processes and poor adaptability. Therefore, this paper proposes a micro-nano ozone (O3 ) bubble and hydrogen peroxide (H2 O2 ) advanced oxidation coupling process. By comparing the efficacy differences between micro-nano O3 bubbles and conventional O3 bubbles, and analyzing the influence laws of key parameters such as H2 O2 mass concentration, O3 mass concentration, and pH values, a dynamic change prediction model for H2 O2 mass concentration and O3 mass concentration is built with the influent COD mass concentration as the variable. Additionally,gas chromatography-mass spectrometry (GC-MS) was adopted to reveal the pollutant degradation path dominated by hydroxyl radical oxidation and the accumulation characteristics of intermediate products. The results show that the bubble particle size generated by the micro-nano bubble generation system ranges from 10 to 50 μm, with an average particle size of approximately 30 μm. Micro-nano bubbles have significant advantages in enhancing mass transfer and promoting the generation of free radicals. The optimal process conditions for Block 3# produced water are H2 O2 mass concentration of 20 mg/L, O3 mass concentration of 40 mg/L, and the pH value maintaining at the original water state. The optimal O3 dosage has a linear relationship with COD mass concentration, and the optimal H2 O2 dosage shows a quadratic polynomial relationship with COD mass concentration. The degradation path follows the pattern of generating oxygen-containing intermediates after the fragmentation of large molecules, and then experiencing partial mineralization, which can degrade and convert most of the crude oil components and achieve a total conversion rate of over 75%. The research results can provide a theoretical basis for the efficient treatment of produced water from oil fields.