臭氧微纳米气泡强化石化废水中硫氰酸根去除机制的研究

文章利用臭氧 $ \left(\mathrm{O}_{3}\right) $微纳米气泡(micro-nano bubbles, MNBs)技术去除水中的硫氰酸根 $ \left(\mathrm{SCN}^{-}\right) $，通过改进 $ O_{3}-NMBs $的产生方式强化目标物的去除，探究不同反应条件对 $ SCN^{-} $去除效率的影响和一级反应动力学特征，并初步揭示 $ SCN^{-} $的去除机理。结果表明：当 $ O_{3} $流量为250 mL/min、 $ SCN^{-} $溶液初始质量浓度为100 mg/L且pH=3时， $ SCN^{-} $反应速率最快且去除率为100%；水中低质量浓度的共存离子不会对 $ SCN^{-} $去除效果产生显著影响。 $ SCN^{-} $的去除机理表明，羟基自由基是 $ O_{3}-NMBs $反应体系中起主要作用的自由基， $ SCN^{-} $中的氮在该体系中一部分转化为 $ N_{2} $，另一部分转变为氨氮。 $ O_{3}-NMBs $技术可有效去除石化废水中的 $ SCN^{-} $，研究结果可为实际石化废水处理提供参考。

This paper utilized ozone( $ O_{3} $) micro-nano bubbles(MNBs) technology to remove thiocyanate (SCN $ ^{-} $) from water, enhanced the removal of the target by improving the generation of $ O_{3} $-MNBs, explored the effects of different reaction conditions on the removal efficiency of $ SCN^{-} $and the kinetic characteristics of the first-stage reaction, and preliminarily revealed the removal mechanism of $ SCN^{-} $. The results showed that when the $ O_{3} $ flow rate was 250 mL/min, the initial mass concentration of $ SCN^{-} $solution was 100 mg/L and the pH value was 3, the reaction rate of $ SCN^{-} $removal was the fastest and the removal rate was 100%. The low concentration of coexisting ions in the water did not have a significant effect on the removal of $ SCN^{-} $. The removal mechanism of $ SCN^{-} $showed that the hydroxyl radical was the main radical in the $ O_{3} $-MNBs reaction system, and the nitrogen in $ SCN^{-} $was partly converted to $ N_{2} $ and partly converted to ammonia nitrogen in the system. $ SCN^{-} $can be effectively removed from petrochemical wastewater by using the $ O_{3} $-MNBs technology, and the study can provide a reference for the treatment of petrochemical wastewater.