Summary of Study Session 10
In Study Session 10, 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 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 to 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 solid waste, to recognise hazardous waste, and to appreciate how it should be handled and treated.