| Octolig® is a pH-responsive immobilized ligand, not an ion exchange resin. Because Octolig® has large stability constants, Octolig® continues to remove heavy metals from waste streams, even when other common chelators are present. Octolig® has a higher affinity for heavy metals than ion exchange resins; therefore, Octolig® is more selective for the heavy metals. |
| Because it is selective for the heavy metals, Octolig® consistently removes heavy metals to concentrations of parts per billion. Octolig® has no affinity for benign alkali ions, such as sodium, calcium, sulfates, chlorides, etc., and those ions are not retained. |
| All chelation reactions of Octolig® take place on the surface of the silica gel. This enables the Octolig® columns to be regenerated with only a small volume of acidic solution. Contact times are not critical, unlike with ion exchange resins where contact time is needed for the reaction to take place. Because chelation takes place on the surface of the Octolig®molecule, Octolig® does not experience fouling. |
| Octolig® may be regenerated hundreds of times without losing its capacity for heavy metals. Ion exchange resins start to break down after numerous regenerations, and that lowers their capacity. |
| Octolig® uses a pH-responsive ligand that retains heavy metals from low concentration solutions in a pH range (between a pH of 2 to 10) and releases the heavy metal at high concentrations at a lower pH (between a pH of 0.5 and 1). |
| For regeneration, only a small volume of dilute acid is needed, followed by washes with water and then by a dilute basic solution. Usually, the acid regeneration solution will contain a concentration of heavy metals in the range of 2,000 to 4,000 ppm. |
| The very small amount of regenerant solution may be precipitated or evaporated, with the precipitate or the evaporate being sent to a smelter. Reclaiming is the cheapest way of disposing of heavy metals, since it ends the disposal liability cost forever. |
| Metre-General, Inc. wants to help your company. Please fill out the information on the following data sheet. With the requested information, MGI is able to design an Octolig® system for your specific needs. |
