Identify one method used to treat hazardous wastes.

Incineration is a widely recognized method for treating hazardous wastes. This thermal treatment process involves the combustion of waste materials at high temperatures, which transforms hazardous substances into less toxic compounds. During incineration, organic materials are broken down, and the heat generated can be captured and used for energy production, which adds an additional benefit to the process.

One of the primary reasons incineration is effective for hazardous waste treatment is that it significantly reduces the volume of waste, often by as much as 90%, thus minimizing the space required for storage. Furthermore, the process can destroy various harmful organic compounds and pathogens, leading to a safer end product, such as ash, that can often be managed more easily than the original hazardous waste.

Other methods listed, such as landfilling, recycling, and composting, have their roles but are not as suitable for treating hazardous wastes due to the potential risks they pose. For instance, landfilling can lead to leachate issues that may contaminate soil and groundwater if not properly managed, while recycling and composting are typically feasible only for non-hazardous materials.