Calcium Peroxide Supplier - Hepure

Product Details

Hepure is a calcium peroxide supplier to customers in the US and around the world.    Calcium Peroxide is a bioremediation product used to supplement oxygen for microbial degradation of petroleum hydrocarbons.  Hepure Technologies, Inc. (Hepure) supplies remediation-grade calcium peroxide as a bioremediation product in a fine granular form, available in 55 lb. bags and 2000 lb. super sacks. Calcium Peroxide (CaO2) has a molecular weight of 72.07 grams per mole.

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Additional Info

Microorganisms degrade petroleum hydrocarbons in soil, groundwater, sludge, and solids. Microorganisms break down contaminants to carbon dioxide and water by using the petroleum hydrocarbons as an energy source or co-metabolizing with an energy source.

To stimulate and enhance microbial activity, amendments (bio-stimulation), such as air, organic substrates, nutrients, and other bioremediation products can be added. Bio-stimulation can be used where the bacteria necessary to degrade the contaminants are present, but, conditions do not favor their growth.

Oxygen is typically the most limiting factor in in-situ bioremediation of petroleum hydrocarbons.  Stoichiometrically, 3.1 mg/L of oxygen is required to biodegrade 1 mg/l hydrocarbons.  When groundwater is saturated with dissolved oxygen at 6-12 mg/L (depending on temperature), fully saturated groundwater can be expected to degrade 2-4 mg/L of hydrocarbons.  Each pound of petroleum hydrocarbons will require 3 pounds of oxygen for full degradation.  A pound of the bioremediation product calcium peroxide will produce about 0.6 pounds of oxygen.  Calcium peroxide produces dissolved oxygen, so no oxygen is lost as bubbles from the aquifer.

Hepure’s bioremediation product calcium peroxide is an electron donor to supplement oxygen. Calcium peroxide has a very low solubility, which allows oxygen release over prolonged periods. In the presence of water, calcium peroxide naturally decomposes very slowly to form calcium hydroxide and oxygen:

2CaO2 + 2H2O → 2Ca(OH) 2+ O2

Methods of Application

The primary application of bioremediation products such as calcium peroxide involves injecting a compound slurry into direct-push borings (e.g., Geoprobe).  The slurry can be varied by depth and location to insure an adequate supply of oxygen within the contaminate plume.

The bioremediation product calcium peroxide can be mixed directly with contaminated soil and then using the mixture as backfill or hauling it to a disposal site. Calcium peroxide can also be placed into drilled boreholes, to create a bio-barrier, or in the bottom of an excavation which has penetrated the saturated zone.

References

Curtis and Lammey, 1998, Intrinsic remediation of a diesel fuel plume

Das, Nilanjana & Chandran, Preethy. (2011). Microbial Degradation of Petroleum Hydrocarbon Contaminants: An Overview. Biotechnology research international.

Calcium Peroxide for soil remediation:

  1. Enhancing Bioremediation: Calcium peroxide slowly releases oxygen over time when it comes into contact with water. This property makes it a valuable tool in bioremediation efforts because it can promote the growth and activity of aerobic bacteria and other microorganisms that are capable of breaking down organic contaminants. The release of oxygen is particularly useful in anaerobic soils where oxygen concentrations are naturally low.
  2. Chemical Oxidation of Contaminants: Like other peroxides, calcium peroxide can also contribute to the direct oxidation of certain types of contaminants in soil. This can include various types of organic compounds, such as petroleum hydrocarbons and certain types of pesticides.
  3. In-Situ Treatment: Calcium peroxide can be applied directly to the contaminated soil, making it a good option for in-situ soil remediation. It’s a solid compound, so it’s often mixed with soil or applied in a slurry form. This makes it particularly useful for treating contaminated soils at or near the surface.
  4. Stabilizing Heavy Metals: Calcium peroxide can assist in stabilizing certain heavy metals in the soil by creating conditions that promote the precipitation or adsorption of these metals, thus reducing their mobility and bioavailability.

Calcium Peroxide for water remediation:

  1. Enhancing Bioremediation: Calcium peroxide can slowly release oxygen into the water over time, which can enhance the growth and activity of aerobic bacteria. These bacteria can break down various organic pollutants present in water, such as hydrocarbons and other organic waste products. This method is particularly beneficial in bodies of water with low dissolved oxygen levels that limit the activities of aerobic bacteria.
  2. Chemical Oxidation of Contaminants: Calcium peroxide can participate in the chemical oxidation of certain types of contaminants in the water. When calcium peroxide decomposes, it generates hydrogen peroxide, which can further decompose to generate hydroxyl radicals (•OH). These hydroxyl radicals are potent oxidizing agents and can react with a wide variety of organic compounds, transforming them into less harmful substances. This mechanism can target pollutants such as phenols, chlorinated hydrocarbons, dyes, and other organic compounds.
  3. Removal of Certain Inorganic Contaminants: Calcium peroxide has also been studied for the removal of specific inorganic pollutants, such as certain heavy metals and nitrate. For instance, the generation of hydroxyl radicals from the decomposition of calcium peroxide can promote co-precipitation processes that immobilize heavy metals, thus reducing their bioavailability and toxicity.
  4. In-Situ Chemical Oxidation (ISCO): Calcium peroxide is suitable for in-situ chemical oxidation, where the oxidant is injected directly into the contaminated groundwater. This method is effective for reaching deep-seated contaminants, providing oxygen and reactive species right at the source of contamination.