Which radon removal method is most effective considering cost and footprint?

Which radon removal method is most effective considering cost and footprint?

• A. packed tower aeration
• B. granular activated carbon
• C. ion exchange
• D. diffused aeration

Answer: (A)

Radon removal from water relies on stripping the gas from the water into air. Packed tower aeration provides a large gas–liquid contact area in a compact column, so it strips radon efficiently without needing a huge tank. This high mass-transfer performance per unit volume means you can treat typical well-water flows with a relatively small footprint and moderate energy use, keeping both capital and operating costs down. Other options fall short for this purpose. Granular activated carbon can remove many contaminants, but radon is a gas that tends to desorb and escape, requiring very large beds and careful handling of radioactive carbon waste, which makes the approach costly and space-intensive. Ion exchange targets ionic contaminants, not a noble gas like radon, so it doesn’t effectively remove radon from water. Diffused aeration can strip radon too, but achieving the same removal with comparable efficiency often demands larger equipment or deeper water depths, leading to a bigger footprint and higher costs. So, for removing radon while keeping both space requirements and overall cost reasonable, packed tower aeration is the best choice.

Radon removal from water relies on stripping the gas from the water into air. Packed tower aeration provides a large gas–liquid contact area in a compact column, so it strips radon efficiently without needing a huge tank. This high mass-transfer performance per unit volume means you can treat typical well-water flows with a relatively small footprint and moderate energy use, keeping both capital and operating costs down.

Other options fall short for this purpose. Granular activated carbon can remove many contaminants, but radon is a gas that tends to desorb and escape, requiring very large beds and careful handling of radioactive carbon waste, which makes the approach costly and space-intensive. Ion exchange targets ionic contaminants, not a noble gas like radon, so it doesn’t effectively remove radon from water. Diffused aeration can strip radon too, but achieving the same removal with comparable efficiency often demands larger equipment or deeper water depths, leading to a bigger footprint and higher costs.

So, for removing radon while keeping both space requirements and overall cost reasonable, packed tower aeration is the best choice.