本文探讨了利用过氧化钙活化过硫酸钠氧化修复实际污染场地长期高浓度石油类(TPH)污染土壤的可行性.研究了过氧化氢、过氧化钙、过氧化钙/Fe2+等活化方法对TPH降解效率的影响.结果表明,对于TPH污染较重的土壤(浓度15000 mg·kg-1),过氧化钙较过氧化氢活化过硫酸钠降解的效果更好,使用过氧化氢活化方法,TPH最高降解率仅为25.6％,而当过氧化钙/过硫酸钠的用量(物质的量之比)为1/5时,反应7d,TPH去除率达到67.4％,反应不需要添加额外的活化剂.当Fe2+/过氧化钙/过硫酸钠的用量为1/2/5时,反应7d,TPH降解率为82.1％,较不添加Fe2+高14.6％,反应后体系呈中性.进一步增加过氧化钙的用量,TPH去除率和体系pH均增加.研究表明,CaO2/Fe2+活化过硫酸钠氧化修复石油类污染土壤效果较好,考虑到实际场地后续利用的可行性,Fe2+/过氧化钙/过硫酸钠的用量为1/2/5较为合适.
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