Study on the Driving Factors of Cr Re-dissolution after Stabilizing Contaminated Soil
The main research focuses on the driving factors of Cr re-dissolution after stabilization treatment.The results showed that the condi-tions with the greatest promoting effect of re-dissolution were water flooding,pH of acid rain at 1,temperature of 40℃,oxygen bubbling for 3 days perweek,Cr(VI)in the soil increasing from10.00 mg/kg to31.47 mg/kg,and total Crin the leaching solution increasing from0.15 mg/L to 0.36 mg/L.The effective content of Cr increased by 0.02%,1.46%,2.12%,0.03%and 0.85%after treatment under conditions of 40℃,water flooding,pH of acid rain at 1,pH of acid rain at 12,and 3 days of oxygen blowing per week.The moisture content is the main factor affecting the Cr re-dissolution after stabilization treatment of contaminated soil,while the pH of acid rain is the secondary factor.The release of Cr in the stabilized soil showed the highest degree of fit with the second-order kinetic equation under different acid rain pH conditions.
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