Mumbai University > CIVIL > Sem 7 > Solid Waste Management

Marks: 10 M

Year: Dec 2014

The various equipments used in separation of solid waste are as follows:

1. Mechanical component separator:

• Component separation is a necessary operation in the recovery of resources from solid wastes and where energy and conversion products are to be recovered from processed wastes.
• For example, trammels are now used routinely for the separation of unprocessed waste.
• Along with trammels, shredders are also used for the separation.

2. Magnetic and Electromechanical separators:

• Magnetic separation of ferrous materials a well established technique in the metal industry is a new used commonly for the removal of ferrous metals from solid wastes
• More recently a variety of electromechanical techniques have been developed for the removal of several non ferrous materials.

3. Drying and Dewatering:

• In many solid waste energy recovery and incineration systems the shredded light fraction is predried to decrease weight.
• Although the energy requirements for drying wastes vary with local conditions, the required energy inputs can be estimated by using a value of about 4300kJ/kg of water evaporated.

The importance of 3R principal in solid waste management is:

1. The three R's - reduce, reuse and recycle - all help to cut down on the amount of waste we throw away.
2. They conserve natural resources, landfill space and energy.
3. The three R's save land and money communities must use to dispose of waste in landfills.
4. Siting a new landfill has become difficult and more expensive due to environmental regulations and public opposition.
5. It makes economic and environmental sense to reuse products. Sometimes it takes creativity.
6. Recycling is a series of steps that takes a used material and processes, remanufactures, and sells it as a new product. Begin recycling at home and at work.