Volatile organic compound barrier

The Dual Auger system is an in situ treatment for soils contaminated with volatile organic compounds (VOCs), chlorinated volatile organic compounds (CVOCs), and inorganics. This process uses specialized equipment to mix soil and inject reagents. The system can add nutrients to promote bioremediation, inject steam to volatilize contaminants, install zero-valent iron to promote chemical treatment, or add a pozzolanic slurry to stabilize the contaminants. The injection and mixing process effectively breaks down fluid and soil strata barriers. Mixing also eliminates pockets of contamination that would otherwise remain untreated. 

Metal-based permeable reactive barriers (metal-based PRBs) are an emerging class of in situ technologies for the treatment of groundwater contaminated with volatile organic compounds... 

In contrast, organophilic PV membranes are used for removal of (volatile) organic compounds from aqueous solutions. They are typically made of rubbery polymers (elastomers). Cross-linked silicone rubber (PDMS) is the state-of-the-art for the selective barrier [1, 43, 44]. Nevertheless, glassy polymers (e.g., substituted polyacetylene or poly(l-(trimethylsilyl)-l-propyne, PTMSP) were also observed to be preferentially permeable for organics from water. Polyether-polyamide block-copolymers, combining permeable hydrophilic and stabilizing hydrophobic domains within one material, are also successfully used as a selective barrier. 

Franz, R. 1993. Permeation of volatile organic compounds across polymer films. Part I Development of a sensitive test method suitable for high barrier packaging films at very low permeant vapour pressures. 

The aim of the present work was focused on the improvement of the mechanical properties as well as the water resistance of caseinate-based films. The first part of this study deals with the control of the mechanical properties through addition of a plasticizer. A plasticizer is defined as a low volatile organic compound which causes a decrease in polymer glass transition temperature (Tg) and an increase in flexibihty and extensibility. By decreasing intermolecular forces between polymer coils, plasticizers cause an increase in material flexibility and conversely a decrease in the barrier properties due to the augmentation of the free volume [13,14]. To summarize, an initially hard and brittle material becomes soft and flexible when sufficiently... 

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