| 摘要: |
| 目的 针对高盐难降解的页岩气压裂返排液,探究了碱活化过硫酸钠(NaOH/PS)氧化有机物的可行性。方法 进行了过硫酸钠(PS)投加量、初始pH值、PS投加方式的单因素实验,进行了总有机碳(TOC)去除率动力学方程的拟合,开展了NaOH/PS体系反应机理的分析。结果 NaOH/PS氧化页岩气压裂返排液最佳反应条件为PS质量浓度1 500 mg/L,初始pH值为12,PS分4次投加,TOC去除率符合准二级反应动力学。通过EPR及淬灭实验,发现NaOH/PS氧化体系中的活性物质为SO-4· 和OH·。结论 研究结果可为页岩气压裂返排液中有机物去除装置的设计和运行提供参考。 |
| 关键词: 过硫酸钠 页岩气压裂返排液 碱活化 羟基自由基 硫酸根自由基 |
| DOI：10.3969/j.issn.1007-3426.2023.04.020 |
| 分类号: |
| 基金项目:中国石油-西南石油大学创新联合体研究专题“低成本压裂返排液重复利用与无害化处理技术研究”(2020CX020300)；四川省自然科学基金项目“页岩气压裂返排液放射性核素迁移转化规律及无害化处理技术研究”(2022NSFSC0220) |
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| Alkali-activated sodium persulfate oxidation technology for shale gas flowback water |
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Liu Yu1, Xiong Jun2, Xiong Ying3, Xiao Xiao1, Lyu Chun1, Liu Wenshi1
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1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , Sichuan, China;2. Institute of Safety, Environmental Protection and Technical Supervision, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;3. Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu , Sichuan, China
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| Abstract: |
| Objective The aim was to explore the feasibility of removing organic matter in high saline and refractory shale gas flowback water through oxidation by alkaline activated sodium persulfate (NaOH/PS). Methods Single-factor analysis of PS dosage, initial pH value and PS dosage were performed, while the kinetic equations of TOC removal rate and the reaction mechanism of NaOH/PS system were investigated. Results The results showed that the optimal reaction conditions of NaOH/PS oxidation shale gas flowback water are as follows:PS concentration at 1 500 mg/L, initial pH value at 12, PS added four times; and organic matter degradation could be described by quasi-second-order reaction kinetics. EPR and quench experiments showed that the active substances in NaOH/PS oxidation system were SO-4· and OH·. Conclusion sThis study could serve as the reference for the design and operation of organic matter removal units in the shale gas flowback water treatment process. |
| Key words: sodium persulfate shale gas flowback water alkaline activation hydroxyl radical anion sulfate radical anion |
