活性炭三维电极催化臭氧处理气田水研究

doi:10.19965/j.cnki.iwt.2024-0584

摘要/Abstract

摘要：

以颗粒活性炭作为粒子电极，构建了一种阴极单极极化的三维电极催化臭氧反应体系（3D/O₃）。系统比较了该技术与常规臭氧氧化（O₃）、三维电极电化学氧化（3D）、活性炭催化臭氧氧化（GAC/O₃）等相关技术对某气田采出水低温蒸馏出水的处理效果，并探究了反应机理。经过2 h处理，3D/O₃技术可有效去除废水中92%的总有机碳（TOC），优于其他相关技术，并稳定维持运行8个周期。研究结果表明，3D/O₃技术可有效强化臭氧传质，提高臭氧利用率和转化为羟基自由基的效率，从而强化了污染物去除效果。同时，3D/O₃技术可有效防止活性炭在废水处理过程中氧化失效，延长了活性炭的使用寿命，提高了系统的稳定性，有望为气田水提供一种可行的处理技术。

关键词: 三维电极, 活性炭, 臭氧, 电催化臭氧氧化

Abstract:

A three-dimensional electrode catalyzed ozonation(3D/O₃) process was developed using granular activated carbon as the particle electrodes under cathodic polarization conditions. The 3D/O₃ process was investigated and compared with conventional ozonation(O₃), 3D electrochemical oxidation(3D), and GAC catalyzed ozonation for the treatment of distillate of gas field wastewater. The results showed that the 3D/O₃ process removed approximately 92% of total organic carbon(TOC) in 2 h, which was more effective than other processes. In addition, the 3D/O₃ process maintained stable TOC removal over eight cycles,demonstrating the long-term stability of the system. Compared with conventional ozonation, the 3D/O₃ process considerably improved ozone mass transfer and utilization efficiency, and produced more hydroxyl radicals(·OH) to enhance pollutant removal. Furthermore,due to the cathodic protection, the 3D/O₃ process effectively mitigated the oxidation of GAC by O₃ and ·OH, and thus extended the lifetime of GAC and improved the system stability for wastewater treatment. These results indicated that the 3D/O₃ could provide a promising technology for the treatment of gas field wastewater.

Key words: three-dimensional electrodes, activated carbon, ozone, electrocatalytic ozonation

中图分类号:

X703.1

司艳晓, 张洋, 王会姣, 王玉珏. 活性炭三维电极催化臭氧处理气田水研究[J]. 工业水处理, 2025, 45(8): 121-127.

Yanxiao SI, Yang ZHANG, Huijiao WANG, Yujue WANG. Three-dimensional electrode/ozone process coupled with granular activated carbon to treat gas field water[J]. Industrial Water Treatment, 2025, 45(8): 121-127.

https://www.iwt.cn/CN/Y2025/V45/I8/121

图/表 10

表1 蒸馏冷凝水水质参数

Table 1 Water quality parameters of distillate

指标	数值	指标	数值
pH	7.95	悬浮性总固体/（mg·L^-1）	342
TOC/（mg·L^-1）	43.15	氯化物/（mg·L^-1）	<0.07
COD/（mg·L^-1）	145	钙/（mg·L^-1）	<0.144
BOD₅/（mg·L^-1）	42.5	镁/（mg·L^-1）	14.2
电导率/（μS·cm^-1）	76.5	铁/（mg·L^-1）	4.05
总硬度/（mg·L^-1）	<1.0	石油类/（mg·L^-1）	1.47

图1 反应装置示意 1—镍网阴极；2—颗粒活性炭；3—PTFE膜；4—钛镀钌依阳极；5—曝气器。

Fig. 1 Diagram of the reaction device

图2 3D/O₃与其他技术处理气田冷凝水过程中的TOC去除率

Fig.2 TOC removal efficiency during gas field condensate treatment by 3D/O₃ and other technologies

图3 3D/O₃与其他技术处理气田冷凝水过程中的气相O₃浓度和液相O₃浓度

Fig.3 Gas-phase and liquid-phase ozone concentrations during gas field condensate treatment by 3D/O₃ and other technologies

图4 3D/O₃与其他技术处理气田冷凝水过程中去除TOC的能耗

Fig.4 Energy consumption for TOC removal in gas field condensate treatment by 3D/O₃ and other technologies

图5 3D/O₃和GAC/O₃技术处理气田冷凝水后的TOC去除情况和终点COD

Fig. 5 TOC removal efficiency and terminal COD during gas field condensate treatment by 3D/O₃ and GAC/O₃ technologies

图6 XPS分析结果

Fig.6 Results of XPS analysis

图7 3D/O₃过程中O₃浓度对TOC去除和O₃传质量的影响

Fig.7 Effect of O₃ concentration on TOC removal and mass transfer of O₃ in 3D/O₃ process

图8 3D/O₃过程电流强度对TOC去除影响

Fig.8 Effect of current intensity on TOC removal in 3D/O₃ process

图9 3D/O₃过程中气泡粒径对TOC去除的影响和O₃传质量

Fig.9 Effects of bubble size on TOC removal efficiency and ozone mass transfer in the 3D/O₃ process

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