Activated carbon sources, coconut vs. coal, and when colloidal carbon is worth the cost — practical answers for remediation projects.
Activated carbon is one of the most versatile tools in remediation — and one of the most frequently misunderstood. These are the questions we hear most often about colloidal, powdered, and granular activated carbon.
Any carbonaceous material that can be burned in an anaerobic atmosphere can be made into activated carbon. Wood, coconut shell, and coal are the most common sources because they are readily available and convert easily. After the base carbon is produced, it is activated by physical methods (steam or CO2 at high temperature) or chemical methods (such as KOH or H3PO4) to create the porous network that gives activated carbon its enormous adsorptive surface area.
Carbon made from wood, coconut, and coal each has distinct characteristics — matching the source material to the target contaminants is often the key to a cost-effective result.
Coconut activated carbon is a primary choice for many projects due to its low cost and high effectiveness at capturing smaller contaminant molecules such as benzene, toluene, perchloroethylene, and trichloroethylene. The activation process for bituminous and lignite coal-based carbon can target larger molecules, such as PFOS compounds and semi-volatile organic compounds.
Typically, coconut activated carbon costs less per pound. But price per pound isn’t the whole picture — you also have to evaluate the carbon’s capacity for your specific contaminants and its resistance to competing substances in the water. A cheaper carbon that requires frequent change-outs can quickly become the more expensive option.
Yes. Colloidal carbon products contain roughly 15% activated carbon and require additional processing to manufacture, making them more expensive per treated volume. For stabilization or injection at a dose rate of about 1% of soil weight, expect roughly 37 pounds of carbon per cubic meter of soil. Budgetary cost per cubic meter of treated soil:
The premium for colloidal carbon is generally only justified for in situ treatment. Its very small particle size produces a larger radius of influence (ROI) and allows application through existing well screens — often eliminating drilling costs that would otherwise dwarf the material premium.
Powdered and granular carbon are more cost-effective for many in situ and ex situ applications. Powdered carbon can be injected with typical non-high-pressure equipment; granular carbon injection requires high-pressure equipment. Both work well in soil mixing, depending on the mixing method and soil composition.
See colloidal activated carbon, Fluxsorb RC, Fluxsorb RP, and CarbPure TRA — or review carbon treatment strategies. Specification sheets are available on our Technical Resources page, and our team can help you compare options: 866-727-4776.