Proton generation by dissolution of intrinsic or augmented aluminosilicate minerals for in situ contaminant remediation by zero-valence-state iron

Article Abstract:

The aluminosilicates kaolinite, montmorillonite, and various feldspars were tested using shaken batch bottle (SBB) methods in a nitrogen-filled and oxygen free environment to assess the theory that aluminosilicates contribute to the reactivity of zero-valent iron. Quantities of the minerals were subjected to the SBBs to assess the relation between mineral mass and chromate reduction rate. Results indicate that the rate of contaminant reactions by zero-valent iron oxidation significantly affects proton generation by aluminosilicate mineral dissolution.

All Other Basic Inorganic Chemical Manufacturing, Primary aluminum, Aluminum, Primary Aluminum Production, Industrial inorganic chemicals, not elsewhere classified, Iron Compounds NEC, Silicates, Aluminum industry, Aluminum products, Iron compounds, Aluminum silicates, Protons

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Coupled iron corrosion and chromate reduction: mechanisms for subsurface remediation

Article Abstract:

The effectiveness of zero-oxidation-state iron metal in reducing chromium from the Cr(VI) to the Cr(III) state was investigated. The results showed that the level of chromate reduction was dependent on the specific form of iron metal used, with some producing extremely rapid reduction rates while others had no effect at all. This difference in effect is explained by a cyclic, multiple reaction electrochemical corrosion mechanism.

Chromium, Chromium (Metal), Corrosion and anti-corrosives, Corrosion

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Properties of food grade (edible) surfactants affecting subsurface remediation of chlorinated solvents

Article Abstract:

Food grade surfactants exhibited different properties relative to losses in the subsurface after groundwater remediation. Precipitation models were used to determine the precipitation boundary of the surfactants. Results were used as guide in developing measures to improve the performance of the surfactant systems and lower the costs of remediation.

Environmental aspects, Pollution, Control, Water, Underground, Groundwater, Surface active agents

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