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Integrated remediation for organic-contaminated site by forcing running-water to modify alkali-heat/persulfate via oxidation process transfer
Chemosphere ( IF 8.8 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.chemosphere.2020.128352
Qihui Xu , Feng Shi , Hong You , Shutao Wang

As organic pollution of soil and groundwater increases, the effective and economical remediation of contaminated sites has drawn growing attention. In this study, running-water (RW) was designed to modify alkali-heat/persulfate (MAH/PS) for integrated remediation of an actual organic-contaminated site. The degradation efficiency mainly reached 60%-99% for Benz[a]anthracene, Benzo[a]pyrene and total petroleum hydrocarbons (TPHs). MAH/PS was more effective in degrading Benzene and 1,2-Dichloroethane with simple molecular configurations. The pollutant degradation efficiencies decreased with increasing site depth and increased with increasing pollutant concentrations. Migration with RW enhanced site remediation. By monitoring the groundwater after remediation, it was found that residual TPHs presented anomalous diffusion; SO42− ranged from 8.00-237.00 mg L-1 to 8.00-290.00 mg L-1 and pH presented alkalescence (7.00-8.20). Mathematical models were established to describe the reaction process including the solubility equilibrium of calcium hydroxide, temperature equilibrium, and reaction kinetics. Moreover, MAH/PS provided a cost-saving approach for site remediation.



中文翻译:

通过强迫自来水通过氧化过程转移来改变碱热/过硫酸盐的方法,对有机污染的场地进行综合治理

随着土壤和地下水有机污染的增加,对受污染场地的有效而经济的补救已引起越来越多的关注。在这项研究中,设计了自来水(RW)来修改碱热/过硫酸盐(MAH / PS),以对实际的有机污染场所进行综合修复。苯并[蒽]蒽,苯并[a] py和总石油烃(TPHs)的降解效率主要达到60%-99%。MAH / PS以简单的分子构型更有效地降解苯和1,2-二氯乙烷。污染物降解效率随着场地深度的增加而降低,并随着污染​​物浓度的增加而增加。通过RW迁移可以增强站点修复能力。通过对修复后的地下水进行监测,发现残留的TPHs呈现异常扩散。SO 42-的范围从8.00-237.00 mg L -1到8.00-290.00 mg L -1,pH呈碱性(7.00-8.20)。建立了描述反应过程的数学模型,包括氢氧化钙的溶解度平衡,温度平衡和反应动力学。此外,MAH / PS为站点修复提供了一种节省成本的方法。

更新日期:2020-09-16
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