Summary

In this Study Session, you have learned that:

• Solid waste that cannot be recycled can be treated or disposed of by landfill or thermal processing.
• The two main environmental problems from the landfill are leachate, which can contaminate water sources, and landfill gas, which is a greenhouse gas and is flammable.
• Landfills range from uncontrolled open dumps to sanitary landfills, where leachate and landfill gas are managed and controlled.
• Factors to be considered when selecting a new landfill site include the area of land required, distance from the town, potential for pollution of water sources, soil type and local culture and beliefs.
• The open burning and open dumping of solid waste, which is a common practice in many urban centres in Ethiopia, is dangerous to human health and safety and the wider environment.
• Incineration reduces the volume of waste for disposal, but the remaining ash still needs to be landfilled.
• It is important to know the nature and characteristics of the solid waste, to recognise hazardous waste, and to appreciate how it should be handled and treated.