Density modification of DNAPL using self-demulsifying colloidal biliquid aphron: Kinetics, mechanisms and influencing factors,Journal of Hazardous Materials

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Density modification of DNAPL using self-demulsifying colloidal biliquid aphron: Kinetics, mechanisms and influencing factors
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-08 , DOI: 10.1016/j.jhazmat.2024.135776
Chaoge Yang ₁ , Chunpeng Zhang ₁ , Fangyuan Liu ₁ , Jun Dong ₁

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Density-modification remediation of dense nonaqueous phase liquid (DNAPL) using colloidal biliquid aphron (CBLA) is an efficient means of enhancing flushing and avoiding the risk of downward migration of DNAPL. However, the use of demulsifier is currently necessary for CBLA to achieve density modification. This leads to issues such as low modification efficiency and the risk of secondary contamination. In this work, we developed a self-demulsifying CBLA (PO-CBLA-S) for density-modification remediation of DNAPL, eliminating the need for external demulsifiers. The self-demulsification process exhibited pseudo-secondary reaction kinetics, achieving densities below 1 g/cm3 for various DNAPLs. Groundwater chemistry parameters (pH, anions, cations, temperature, and humic acid (HA) content) were investigated for their impact on perchloroethylene (PCE) density modification. Cations were found to enhance PO-CBLA-S density modification more than anions. Both strong acidic and alkaline environments promote the density regulation of PCE by PO-CBLA-S, and temperature positively correlates with the efficiency of density modification. High concentrations of HA also have a favorable facilitating effect on the density modification. The mechanisms of self-demulsifying density modification were clarified at the microscale. Surfactant entanglement caused by internal surfactant-solvent interaction decreased the stability of PO-CBLA-S, leading to self-demulsification. This study addresses density modification challenges and provides a theoretical foundation for its groundwater remediation applications.

中文翻译：

使用自破乳胶体双液体 aphron 对 DNAPL 进行密度修饰的动力学、机制和影响因素

使用胶体双液体 aphron （CBLA）对致密非水相液体（DNAPL）进行密度修饰修复是增强冲洗和避免 DNAPL 向下迁移风险的有效方法。然而，目前 CBLA 需要使用破乳剂来实现密度改性。这会导致改性效率低和二次污染风险等问题。在这项工作中，我们开发了一种自破乳 CBLA （PO-CBLA-S）用于 DNAPL 的密度修饰修复，无需外部破乳剂。自破乳过程表现出伪二次反应动力学，各种 DNAPL 的密度低于 1 g/cm3。研究了地下水化学参数（pH 值、阴离子、阳离子、温度和腐植酸（HA）含量）对全氯乙烯（PCE）密度改性的影响。发现阳离子比阴离子更能增强 PO-CBLA-S 密度修饰。强酸性和强碱性环境均促进了 PO-CBLA-S 对 PCE 的密度调节，温度与密度改性效率呈正相关。高浓度的 HA 对密度修饰也有良好的促进作用。在微观尺度上阐明了自破乳密度改性的机理。表面活性剂-溶剂内部相互作用引起的表面活性剂缠结降低了 PO-CBLA-S 的稳定性，导致自破乳。本研究解决了密度改性挑战，并为地下水修复应用提供了理论基础。

更新日期：2024-09-08

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