Abstract: A system and method for recovering metal contaminants from soil, including a leaching subsystem and a metal recovery system.

Abstract: A decontamination system and method for the decontamination of a contaminated gas. The contaminated gas is characterized by a gas phase and at least one contaminant. The contaminated gas is removed from its source and is introduced into a loop through which a bio-agent is circulated. The bio-agent includes a microorganism (e.g. bacterium) effective for the biodegradation of the contaminant. The bio-agent may also include a liquid carrier. The loop may include absorption column, separator and bioreactor positioned in the loop. An oxidation means can be utilized to oxidize metals in the contaminated gas. Alternatively, the bio-agent can be replaced by a liquid which circulates through the bioreactor and which is effective for absorption of the contaminant. In other embodiments, the loop can be replaced by a conduit in a form or arrangement other than a loop.

Abstract: A system and method for the decontamination of contaminated ground is described. Contaminated soil gas containing the contaminant is removed from the contaminated ground. Contaminants are separated from the contaminated gas and treated to lessen an environmental hazard of the contaminant. Contaminants are preferably treated by non-thermal oxidation. Residual soil gas, including any oxygen, unoxidized contaminants, and oxidation products (water vapor and carbon dioxide) are returned to the ground, where unoxidized contaminants are subject to oxidation by soil microorganisms. The returned residual soil gas is recirculated through the decontamination system.