List 4 methods used for the disposal of hazardous waste?

1. Incineration: This method involves burning hazardous waste at high temperatures to convert it into ash, gas, and heat. This process helps to reduce the volume of waste and destroy harmful chemicals.

2. Landfill disposal: Hazardous waste can be disposed of in specially designed landfills that are lined with impermeable barriers to prevent contamination of soil and groundwater. These landfills are equipped with systems to collect and treat any leachate that may be generated.

3. Chemical treatment: Hazardous waste can be treated with chemicals to neutralize or detoxify the harmful substances before disposal. This method can involve processes such as oxidation, reduction, or precipitation to render the waste less hazardous.

4. Recycling: Some hazardous waste materials can be recycled or reused in other processes, reducing the need for disposal. This method helps to conserve resources and reduce the environmental impact of waste disposal.