碱激发粉煤灰固化/稳定化铬污染土壤的研究

Stabilization/solidification of chromium-contaminated soil with alkali-activated fly ash binder

通过无侧限抗压强度和铬浸出毒性试验,研究了碱激发粉煤灰胶凝材料与FeCl_(2)对铬污染土壤(CCS)的固化/稳定化效果。结果表明:随碱激发粉煤灰掺量增加,CCS固化体强度提高,Cr^(6+)和总Cr浸出浓度则下降,但仍保留较高的浓度;FeCl_(2)显著降低CCS的Cr^(6+)和总Cr浸出浓度。碱激发粉煤灰胶凝材料和FeCl_(2)复合固化/稳定化CCS,可使CCS同时具有较高的强度和较低铬浸出浓度,28 d无侧限抗压强度近10 MPa,Cr^(6+)和总Cr浸出浓度低至0.5、1.0 mg/L以下,是一种潜在的资源化利用CCS的方法。

Effect of alkali-activated fly ash binder and FeCl_(2) on the solidification/stabilization of chromium contaminated soil(CCS)was explored through unconfined compressive strength and chromium leaching toxicity tests.The results show that the amount of alkali fly ash increases,the strength of the CCS solidified body increases,and the leaching concentrations of Cr^(6+)and total Cr decrease,but remains higher concentration.FeCl_(2) significantly reduced the Cr^(6)+and total Cr leaching concentrations of CCS.Solidification/stabilization with mixture of alkali-activated fly ash binder and FeCl_(2) is a potential resource utilization method of CCS,which make CCS have better strength and lower Cr leaching concentration,such as 28 d strength close to 10 MPa,the Cr^(6+)and total Cr leaching concentration less than 0.5 mg/L and 1.0 mg/L respectively.