A method is presented for biological removal of contaminants like sulfide from ground waters and industrial waters. A portion of the bioreactor effluent water is recycled to the bioreactor and the sulfide oxidizing bacteria by biological oxidation oxidizes sulfides in the water to produce soluble sulfates. The present invention uses a packed bed bioreactor configuration that uses packing material to maximize the concentration of sulfide oxidizing bacteria.

The present invention relates to a medium material for eliminating arsenic pollution from groundwater, which is a granular material having an average particle diameter of 1 to 3 cm, prepared from manganese ore, meerschaum, straws, animal excrements, active sludge and active bacterium agent in a mass ratio of 1:0.2˜0.5:0.5˜1:0.2˜0.4:0.2˜0.4:0.0005˜0.002 via mixing, composting, carbonizing and crushing. The prevent invention also discloses a process for producing the above-mentioned medium material. The medium material of the present invention can eliminate multivalent arsenic from groundwater, has a long service life, and does not cause secondary pollution to groundwater.

A method for treating contaminant within contaminated soil and groundwater, especially deep aquifers, through in situ oxidative remediation of the contaminant by sparging, wherein the method includes multiple injection wells, injecting an oxidizing multi gas comprised of high concentration ozone gas (10-20% ozone by wt., 75-85% oxygen) at pressures up to 500 psi (34.5 bar) to reach well depths in excess of 1100 feet (335 meters) and when necessary compressed ambient air at pressures up to 500 psi (34.5 bar).

A composition for use in remediation of soil and groundwater containing hydrocarbons and halogenated compounds. The remediation composition includes: (a) a first bioremediation material including a first blend of organisms capable of degrading the hydrocarbons; (b) a second bioremediation material including a second blend of organisms differing from the first blend of organisms that is chosen for degrading the halogenated compounds; (c) an organic compound such as a complex carbohydrate (e.g., food grade starch); and (d) a third blend of organisms capable of degrading the organic compound. The degrading of the organic compound by the third blend of organisms breaks the complex carbohydrate into smaller molecules that are utilized by the microorganisms of at least one of the first and second bioremediation materials during the degrading of the hydrocarbons and the halogenated compounds. The first bioremediation composition typically includes activated carbon capable of adsorbing the hydrocarbons and the halogenated compounds.

A dosing pump (19) doses antiscalant into a membrane-based water treatment system (1). The dosing pump (19) includes a displacement body for pumping antiscalant into the membrane-based water treatment system (1) in doses. A motor drives the displacement body. A control module controls the motor. The control module is configured to vary the dosage of antiscalant pumped into the water treatment system (1) based on a temperature corrected system variable (SVTc) being based on a plurality of operating variables of the water treatment system (1).

The present disclosure relates to sulfur-treated zerovalent iron nanoparticles and the use of same for transforming chlorinated solvent pollutants and may therefore be useful as water treatment technology for restoration of groundwater resources contaminated with toxic, chlorinated solvent pollutants.

A method of remediating groundwater by injection a first aqueous solution and then a second aqueous solution into a well situated within the area of the groundwater to be remediated. The first aqueous solution comprises an iron ligand while the second aqueous solution comprises an oxidizing agent. It is envisioned that the ppm ratio of the iron ligand to oxidizing agent ranges from about 0.0005 to about 0.1.

The present invention relates to the extraction of lithium from liquid resources such as natural and synthetic brines, leachate solutions from minerals, and recycled products.

The present invention provides a novel method for treating soil-contaminated water, the method using a photocatalytic material capable of efficiently removing, by light irradiation alone, volatile organic compounds and heavy metals that give rise to soil contamination. The present invention provides a method for treating soil-contaminated water that detoxifies volatile organic compounds contained in soil-contaminated water using a photocatalytic material, the method being characterized by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a gas phase, and (2) decomposing the volatile organic compounds contained in the gas phase obtained in step (1) using the photocatalytic material. The present invention further provides a method for treating soil-contaminated water using a photocatalytic material to remove heavy metals contained in the soil-contaminated water, the method being characterized, by including the steps of (1) subjecting the soil-contaminated water to a gas-liquid separation to obtain a liquid phase, and (2) removing the heavy metals contained in the liquid phase obtained in step (1) using the photocatalytic material.

Discrete, individualized carbon nanotubes having targeted, or selective, oxidation levels and/or content on the interior and exterior of the tube walls are claimed. Such carbon nanotubes can have little to no inner tube surface oxidation, or differing amounts and/or types of oxidation between the tubes' inner and outer surfaces. These new discrete carbon nanotubes are useful in plasticizers, which can then be used as an additive in compounding and formulation of elastomeric, thermoplastic and thermoset composite for improvement of mechanical, electrical and thermal properties.