Petroleum hydrocarbon removal efficiency and application of persulfate activation enhancement in contaminated soil
The soil contaminated with petroleum hydrocarbons at a certain site was applied as the research object to explore the removal performance of persulfate(PS)under thermal activation,Fe2+activation,Fe0 activation,and alkali activation conditions,and to further assess the energy consumption of different activation methods.The results indicated that the degradation rates of petroleum hydrocarbons under these PS activation methods were as follows:alkali activation＞Fe0 activation＞thermal activation＞Fe2+activation.Under the condition of alkali-activated PS,with a PS dosage of 3 mmol/g,NaOH dosage of 9 mmol/g,and reaction time of 5.0 h,the degradation rate of petroleum hydrocarbons reached 86.32％,and the first-order reaction rate constant was as high as 0.428 5 h-1.Energy consumption analysis revealed that the energy requirements for different PS activation methods were in the order of alkali activation＜Fe0 activation＜thermal activation＜Fe2+activation.The pilot test results was applied to guide the remediation of the actual petroleum hydrocarbon-contaminated site.After 24 d of injection and maintenance,the maximum mass concentration of petroleum hydrocarbons within the remediation area was reduced from 30 700 mg/kg to 810 mg/kg,with an average removal rate of approximately 98％.The petroleum hydrocarbons content in the remediated soil met the screening value for the first category of"Soil environmental quality-risk control standard for soil contamination of construction land"(GB 36600-2018).
万方数据
维普
