What type of waste requires a charging hopper, gas cooling, and particulate removal for disposal?

The correct choice is solid wastes, as they often require specialized treatment and disposal methods due to their varied composition and potential environmental impact. When dealing with solid wastes, a charging hopper is used to continuously feed waste material into a processing facility, ensuring efficient handling and management.

Gas cooling is an essential step in the process because when solid waste is combusted, the reaction generates high-temperature gases. Cooling these gases is necessary to prevent damage to equipment and to meet environmental regulations concerning emissions. Lastly, particulate removal is crucial for capturing any residues that may be released during the combustion process, which can include ash and other fine particles that pose health risks if not properly managed.

In contrast, other types of waste listed—such as garbage disposal, paper products, and radioactive wastes—do not typically require the same processing techniques. Garbage disposal focuses more on immediate removal rather than extensive treatment, while paper products may be recycled with less complex methods. Radioactive wastes have their own stringent management and disposal protocols, focused on containment and isolation rather than the thermal processing methods associated with solid waste. Thus, solid wastes are accurately identified as those that necessitate a charging hopper, gas cooling, and particulate removal.