Enhanced solubilization and destruction of tetrachloroethylene by hydroxypropyl-beta-cyclodextrin and iron

Article Abstract:

A study aimed at developing remediation technologies to remove residual and pooled dense, non-aqueous-phase liquids (DNAPLs) from the contaminated groundwater is presented. DNAPLs, which include chlorinated solvents, PCB oils, and certain pesticides, are currently being treated by chemical flushing. This technique, however, induces the vertical remobilization of pooled DNAPL. Hydroxypropyl-beta-cyclodextrin (HP-beta-CD) is one recent remediation technique that enhances the solubilization of DNAPLs. It is believed that the HP-beta-CD and iron metal combination provided a breakthrough in groundwater remediation technology.

Water Supply and Irrigation Systems, Water supply, Water Treatment, Pollution, Water, Underground, Groundwater, Iron, Iron (Metal), Cyclodextrins

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Solubilization of naphthalene and methyl-substituted naphthalenes from crude oil using biosurfactants

Article Abstract:

A study aimed at examining the capacity of biosurfactants to induce aqueous-plus-micellar phase solubility in polycyclic aromatic hydrocarbons (PAHs) from crude oil is presented. The experiment utilized naphthalene and its methyl-substituted derivatives in crude oil as representative PAHs. The glycolipids from Rhodococcus species H13-A and synthetic surfactant Tween-80, meanwhile, were used as bio-surfactants. It was found out that the PHAs' solubilities are more enhanced by the biosurfactants than the synthetic surfactants.

Naphthalene, Petrochemical Manufacturing, Methods, Equipment and supplies, Glycolipids, Petroleum research

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Numerical simulation of surfactant-enhanced solubilization of pooled DNAPL

Article Abstract:

An examination of rate-limited solubilization and vertical mobilization of pooled denser than water non-aqueous phase liquids (tetrachloroethylene) in the presence of surfactants is conducted using a one-dimensional numerical model that simulates the solubilization process. The model afforded generally good predictions of effluent concentrations. These predicted effluent concentrations are enhanced when the equilibrium concentration of organic in surfactant solution is expressed as a function of time.

Analysis

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