环境参数对高氟沉积物应急化学淋洗效率的影响

Effect of environmental parameters on emergency chemical leaching efficiency of high fluoride sediments

具有淋洗效果好、时间短和淋洗液易处理等优点,化学淋洗被广泛用于污染场地的应急处置,然而关于淋洗液的水化学特征和沉积物环境对淋洗效果的影响尚未知。为此,本文以高氟(F^(-))土壤的应急化学淋洗过程为例,依次分析淋洗液的水化学特征和沉积物环境对淋洗效果的影响,并尝试分析其影响机制。碱性环境有助于F^(-)污染土壤的淋洗效率和速率的提升,离子强度对其影响可忽略,而HCO_(3)^(-)的投加是不利的。大粒径、砂土质地、富含黄敏酸的有机质土壤和适宜的固液比(1:15)均有利于高氟土壤F^(-)的溶出。多个要素交互影响下F^(-)溶出浓度的响应面排序为pH,固液比,质地,粒径,离子强度,HCO_(3)^(-)。该结果为保障化学淋洗应急处置高F^(-)沉积物的淋洗效果和实施污染场地的快速应急处置提供了技术保障和科学指导。

Chemical leaching has been widely used for emergency treatment of pollution sites due to high leaching effect,short time and convenient disposal.However,the effects of the hydrochemistry and sediment characteristics are unknown.However,the effect of ion strength negligible.Large particle size,sandy soil,fulvic acid enriched soil and suitable solid-liquid ratio(1:15)conducive to F^(-)leaching.The degree of influence on response surface of F^(-)leaching was pH,solid-liquid ratio,texture,particle size,ion strength,HCO_(3)^(-).The results provide technical support and scientific guidance for ensuring the leaching effect of chemical leaching for emergency treatment of high F^(-)sediments and implementing rapid emergency treatment of polluted sites.