Calcium Peroxide (CaO2)
Hepure is a calcium peroxide supplier to customers in the US and around the world. Calcium Peroxide (CaO2) has a molecular weight of 72.07 grams per mole. 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.
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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.
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.