超声强化柠檬酸淋洗修复锑污染土壤的研究

Remediation of Sb Contaminated Soil by Ultrasonic-enhanced Citric Leaching

采用超声波强化柠檬酸淋洗修复锑污染土壤,研究了超声波功率、超声时间和初始pH值对超声波强化柠檬酸淋洗修复锑污染土壤效果的影响,同时采用Wenzel连续提取法对处理前后土壤中锑的形态变化进行了分析。结果表明,超声波功率、超声时间以及初始pH值对柠檬酸淋洗效果具有显著影响。当超声波功率为550 W、超声时间为60 min、初始pH值=3时,土壤中锑的淋出率达到最大。与单独柠檬酸淋洗相比,超声波强化柠檬酸淋洗效果提高了16.18%。通过形态分析可知,超声波强化能显著提高土壤中各种形态锑的淋出,非特异性结合态锑、特异性结合态锑、无定型铁铝氧化物结合态锑、晶型铁铝氧化物结合态锑以及残渣态锑的淋出分别提高了19.29%、33.5%、29.9%、15.8%和6.4%。

Ultrasound-enhanced citric acid leaching was used to repair antimony-contaminated soil.The effects of ultrasonic power,ultrasonic time,and initial pH on the effect of ultrasonic-enhanced citric acid leaching to repair antimony-contaminated soil were studied.At the same time,Wenzel continuous extraction method was used to analyze the morphological changes of antimony in the soil before and after treatment.The results show that the ultrasonic power,the ultrasonic time and the initial pH value have significant effects on the effect of citric acid leaching.When the ultrasonic power was 550 W,the ultrasonic time was 60 min,and the initial pH value was 3,the leaching rate of antimony in the soil reached the maximum.Compared with citric acid leaching alone,the effect of ultrasonic enhanced citric acid leaching increased by 16.18%.According to morphology analysis,ultrasonic strengthening can significantly improve the leaching of various forms of antimony in soil,and the leaching of non-specific binding antimony,specific binding antimony,amorphous iron and aluminum oxide binding antimony,crystal iron and aluminum oxide binding antimony and residual antimony are increased by 19.29%,33.5%,29.9%,15.8%and 6.4%,respectively.