How to Deploy
APTsorb is a versatile media and can be deployed in almost any tank, vessel, tank, vault or sock. It meshes well with standard equipment. There are a number of things to keep in mind, though, when considering a retrofit to APTsorb.
- APTsorb, because it is an organic media, requires a certain amount of residence time. See more about the mechanisms of the media here. More specifically, the performance of the media is sensitive to the velocity of the water. If the water is flowing past the media too quickly, the media does not have time to form bonds with the metal ions as they travel past. Recommended velocities are dependent on the metal of concern, as well as concentrations and background chemistry, but a general rule of thumb is to keep the velocity less than 2 ft/hr (0.6m/hr). Our flow and volume calculator can give some general guidance on contactor designs.
- In most cases, it is preferable to keep the ratio of bed height to bed diameter less than one. A shorter, squatter contactor is preferred over a taller, thinner vessel. Given the recommended velocities above, this configuration allows for a favorable volume of water to be treated while maintaining the residence time.
- A lead/lag system will extend the life of the media as well as allow for some shortcomings in system design. The different mechanisms at work on the natural peat have different coefficients of performance, which means that the media responds robustly to different system parameters. A lead/lag system can utilize more of the different loading mechanisms than a single-treatment system.
- APTsorb will act as a physical filtration media, in addition to its sorptive capacity. The angular, polar surfaces of the media are very effective at sequestering solids within the bed. The efficacy of APTsorb depends on the characteristics of the solids, but removals exceeding conventional sand filters are possible.
- If suspended solids are a concern, a vessel that allows for backwashing will extend the life of the APTsorb media. Backwashing rates can vary depending on the nature of the solids, but 10-15 gpm/ft2 is generally sufficient to lift the APTsorb bed.
- Regeneration of the APTsorb media is not recommended. The media forms very stable double bonds with metal ions, and regeneration is usually incomplete and unwieldy. Once the media is exhausted, disposal is recommended.
- Disposal of spent APTsorb is dependent on local regulations and how the media was loaded. We recommend that a TCLP test (EPA 1311) or total constituent analysis be performed on the media. For most metals, with the exception of lead, under normal loading conditions, we anticipate that the media will pass the TCLP.
- Contact us for more information about how to retrofit or design a system for APTsorb treatment.