Engineered in situ anaerobic reactive zones

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone metabolize said carbohydrates creating anaerobic conditions which lead to the reduction of hexavalent chromium or trivalent chromium and eventually the precipitation of chromic hydroxide.

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone metabolize said carbohydrates creating anaerobic conditions which lead to the precipitation of metal compounds.

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone are catalysts for the creation of anaerobic conditions which lead to the reduction of hexavalent chromium or trivalent chromium and eventually the precipitation of chromic hydroxide.

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone are catalysts for the creation of anaerobic conditions which lead to the precipitation of metal compounds.

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone are adapted to metabolize said carbohydrates and said sulfates to produce sulfide ions, said microorganisms thereby serving as catalysts for the reduction of hexavalent chromium or trivalent chromium and eventually the precipitation of chromic hydroxide.

A method for removing contaminants dissolved in groundwater, said method comprising the steps of:

• providing an injection well from the ground surface to a contaminated saturated zone;
• and
• supplying carbohydrates and sulfates to said injection well such that said carbohydrates and sulfates are introduced into said contaminated saturated zone;
• wherein microorganisms in said contaminated saturated zone are adapted to metabolize said carbohydrates and said sulfates to produce sulfide ions, said microorganisms thereby serving as catalysts for the precipitation of metal compounds.