2 types of waste:
- biodegradable: waste that can be decomposed, eg, vegetables and paper
- non-biodegradable: waste that can't be broken down, eg, plastic
Landfill - less air pollution, although land is running out
Incineration - less land is used, although it causes air pollution
Advantages of recycling paper:
- less deforestation
- less land used up
- less soil erosion
- maintains habitats
Disadvantages of recycling paper:
- paper is usually not of a great quality
- the addition of nutrients to water from slurry, sewage and fertiliser run-off.
- this leads to increased algal growth
- when the algae die they are decomposed by bacteria and fungi
- bacteria and fungi use up oxygen for respiration
- this causes fish and other organisms living in the sea to die as the will not have a sufficient supply of oxygen.
A similar process to this happens when warm water from industrial cooling plants is released into waterways. This contains less oxygen and is warmer which causes increased algal growth.
Reducing water pollution
Water pollution can be reduced in the following ways:
- more careful use, storage and disposal of silage effluent, slurry and fertiliser.
- sewage treatment