The effectiveness and strength characteristics of persulfate-remediated organic-contaminated soil
To investigate the efficacy and strength properties of Fe2⁺-activated persulfate remediation for 1,2-dichlorobenzene-contaminated soil with varying persulfate concentrations,we conducted degradation,microscopic,particle size,liquid-plastic limit,unconfined compressive strength(UCS),and undrained shear tests.The results indicate that adding 15.0%Fe2⁺-activated persulfate achieves a 92.59%removal rate of 1,2-dichlorobenzene.Furthermore,the reaction produces sodium sulfate,calcium sulfate,and ferric hydroxide.Small amounts of sodium sulfate and calcium sulfate fill the pores between soil particles,leading to a denser soil structure.However,the expansive effect of excessive sodium sulfate crystals weakens the inter-particle cohesion,leading to soil loosening.After remediation,the clay content increases,while the silt and sand content decreases.The liquid limit,the plastic capacity and the plastic index increase,while the plastic limit decreases with the increase of the persulfate dosage.The UCS and the maximum shear stress decrease with the increase of the persulfate dosage.The UCS of the soil treated by 10.0%persulfate is 310.75 kPa,20.34%higher than the strength of untreated soil.The maximum deviator stress at shear failure is 142.73 kPa.
chemical oxidationactivated sodium persulfateorganic-contaminated soilstrength characteristics
万方数据
维普
