试验采用三种活化方式的过硫酸钠和氢氧化钠对六六六的三种异构体(α-HCH、β-HCH、γ-HCH)污染土壤进行化学氧化修复研究.结果表明,加碱和活化过硫酸钠均对六六六产生明显降解效果,其中生石灰+过硫酸盐处理效果最佳,添加强碱也能取得较好效果,但会导致土壤pH值大幅上升,矿物活化过硫酸钠降解更具有持久性,但降解效率低.工程应用氧化修复推荐使用生石灰+过硫酸盐,氧化降解六六六的最佳反应时间为7 d.
Study on the Remediation of Hexachlorocyclohexane Contaminated Soils by Sodium Persulfate
In the experiment,sodium hydroxide and sodium persulfate in three activation methods were used to chemically oxidize and remediate the contaminated soil of hexachlorocyclohexane.The results showed that both alkali addition and activated sodium persulfate had significant effects on the degradation of hexachlorocyclohexane,the sodium persulfate activated by quicklime had the best effect,although adding strong base can also achieved good results,but it caused a significant increase in soil pH value.Besides,mineral activated sodium persulfate degradation was more durable,but the degradation efficiency was low.It is recommended to use the sodium persulfate activated by quicklime for oxidation repair in engineering applications.The optimal reaction time for oxidative degradation of hexachlorocyclohexane is 7 days.
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