活化过硫酸钠修复总石油烃污染土壤效果研究

Effect of Activated Sodium Persulfate on Remediation of TPH Contaminated Soil

被碱(CaO)活化后的过硫酸钠(Na_(2)S_(2)O_(8)),可以加快污染物氧化降解效率,对总石油烃(TPH)具有较好的去除效果。本实验使用全面试验法确定因素为氧化钙(CaO)投加比例、Na_(2)S_(2)O8投加比例、养护天数。研究在碱活化的情况下,添加不同比例的Na_(2)S_(2)O_(8)、CaO和养护不同天数对TPH污染土壤的去除率。碱活化Na_(2)S_(2)O_(8)体系中,随着CaO投加量增加,TPH去除率也相应增加,但CaO投加过量后TPH去除率趋向稳定,在2%的投加比例去除率的幅度达到最高;随着Na_(2)S_(2)O_(8)投加量的增加,TPH去除率先增加后趋向稳定,2%~3%的投加比例去除率幅度上升最大,4%的投加比例去除效果最好;随着反应时间的增加,TPH去除率先增加后趋向稳定,在反应5天时已达到最佳去除效果。

Sodium persulfate(Na_(2)S_(2)O_(8))activated by alkali(CaO)can accelerate the oxidation and degradation efficiency of pollutants and has a better removal effect on total petroleum hydrocarbons(TPH).In this experi-ment,comprehensive test method was used to determine factors such as calcium oxide and CaO dosage pro-portion,Na_(2)S_(2)O_(8) dosage proportion and curing days.Therefore,under the condition of alkali activation,adding different proportion of Na_(2)S_(2)O_(8) calcium oxide and curing for different days,removal rate of TPH contaminated soil was studied.In alkaline(CaO)activated Na_(2)S_(2)O_(8) system,removal rate of TPH increased with the increase of the amount of CaO,but removal rate of TPH tended to be stable after the addition of excessive CaO and re-moval rate reached the highest at the proportion of 2%;With the increase of Na_(2)S_(2)O_(8) dosage,TPH removal in-creased firstly and then tended to be stable.The removal rate of 2%-3%dosage increased the most and the removal effect of 4%dosage was the best;With the increase of reaction time,TPH removal firstly increased and then tended to be stable and the best removal effect was reached after 5 days of reaction.